Mercurial > repos > blastem
annotate zlib/deflate.c @ 2496:187bc857a76a
Fix bug in MED mapper protection bit implementation
author | Michael Pavone <pavone@retrodev.com> |
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date | Sun, 28 Apr 2024 23:33:11 -0700 |
parents | 00d788dac91a |
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rev | line source |
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1 /* deflate.c -- compress data using the deflation algorithm |
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2 * Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler |
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3 * For conditions of distribution and use, see copyright notice in zlib.h |
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4 */ |
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5 |
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6 /* |
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7 * ALGORITHM |
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8 * |
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9 * The "deflation" process depends on being able to identify portions |
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10 * of the input text which are identical to earlier input (within a |
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11 * sliding window trailing behind the input currently being processed). |
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12 * |
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13 * The most straightforward technique turns out to be the fastest for |
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14 * most input files: try all possible matches and select the longest. |
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15 * The key feature of this algorithm is that insertions into the string |
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16 * dictionary are very simple and thus fast, and deletions are avoided |
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17 * completely. Insertions are performed at each input character, whereas |
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18 * string matches are performed only when the previous match ends. So it |
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19 * is preferable to spend more time in matches to allow very fast string |
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20 * insertions and avoid deletions. The matching algorithm for small |
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21 * strings is inspired from that of Rabin & Karp. A brute force approach |
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22 * is used to find longer strings when a small match has been found. |
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23 * A similar algorithm is used in comic (by Jan-Mark Wams) and freeze |
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24 * (by Leonid Broukhis). |
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25 * A previous version of this file used a more sophisticated algorithm |
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26 * (by Fiala and Greene) which is guaranteed to run in linear amortized |
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27 * time, but has a larger average cost, uses more memory and is patented. |
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28 * However the F&G algorithm may be faster for some highly redundant |
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29 * files if the parameter max_chain_length (described below) is too large. |
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30 * |
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31 * ACKNOWLEDGEMENTS |
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32 * |
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33 * The idea of lazy evaluation of matches is due to Jan-Mark Wams, and |
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34 * I found it in 'freeze' written by Leonid Broukhis. |
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35 * Thanks to many people for bug reports and testing. |
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36 * |
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37 * REFERENCES |
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38 * |
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39 * Deutsch, L.P.,"DEFLATE Compressed Data Format Specification". |
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40 * Available in http://tools.ietf.org/html/rfc1951 |
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41 * |
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42 * A description of the Rabin and Karp algorithm is given in the book |
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43 * "Algorithms" by R. Sedgewick, Addison-Wesley, p252. |
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44 * |
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45 * Fiala,E.R., and Greene,D.H. |
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46 * Data Compression with Finite Windows, Comm.ACM, 32,4 (1989) 490-595 |
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47 * |
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48 */ |
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49 |
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50 /* @(#) $Id$ */ |
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51 |
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52 #include "deflate.h" |
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53 |
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54 const char deflate_copyright[] = |
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55 " deflate 1.2.11 Copyright 1995-2017 Jean-loup Gailly and Mark Adler "; |
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56 /* |
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57 If you use the zlib library in a product, an acknowledgment is welcome |
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58 in the documentation of your product. If for some reason you cannot |
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59 include such an acknowledgment, I would appreciate that you keep this |
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60 copyright string in the executable of your product. |
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61 */ |
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62 |
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63 /* =========================================================================== |
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64 * Function prototypes. |
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65 */ |
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66 typedef enum { |
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67 need_more, /* block not completed, need more input or more output */ |
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68 block_done, /* block flush performed */ |
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69 finish_started, /* finish started, need only more output at next deflate */ |
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70 finish_done /* finish done, accept no more input or output */ |
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71 } block_state; |
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72 |
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73 typedef block_state (*compress_func) OF((deflate_state *s, int flush)); |
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74 /* Compression function. Returns the block state after the call. */ |
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75 |
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76 local int deflateStateCheck OF((z_streamp strm)); |
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77 local void slide_hash OF((deflate_state *s)); |
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78 local void fill_window OF((deflate_state *s)); |
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79 local block_state deflate_stored OF((deflate_state *s, int flush)); |
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80 local block_state deflate_fast OF((deflate_state *s, int flush)); |
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81 #ifndef FASTEST |
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82 local block_state deflate_slow OF((deflate_state *s, int flush)); |
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83 #endif |
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84 local block_state deflate_rle OF((deflate_state *s, int flush)); |
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85 local block_state deflate_huff OF((deflate_state *s, int flush)); |
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86 local void lm_init OF((deflate_state *s)); |
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87 local void putShortMSB OF((deflate_state *s, uInt b)); |
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88 local void flush_pending OF((z_streamp strm)); |
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89 local unsigned read_buf OF((z_streamp strm, Bytef *buf, unsigned size)); |
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90 #ifdef ASMV |
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91 # pragma message("Assembler code may have bugs -- use at your own risk") |
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92 void match_init OF((void)); /* asm code initialization */ |
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93 uInt longest_match OF((deflate_state *s, IPos cur_match)); |
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94 #else |
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95 local uInt longest_match OF((deflate_state *s, IPos cur_match)); |
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96 #endif |
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97 |
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98 #ifdef ZLIB_DEBUG |
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99 local void check_match OF((deflate_state *s, IPos start, IPos match, |
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100 int length)); |
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101 #endif |
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102 |
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103 /* =========================================================================== |
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104 * Local data |
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105 */ |
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106 |
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107 #define NIL 0 |
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108 /* Tail of hash chains */ |
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109 |
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110 #ifndef TOO_FAR |
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111 # define TOO_FAR 4096 |
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112 #endif |
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113 /* Matches of length 3 are discarded if their distance exceeds TOO_FAR */ |
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114 |
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115 /* Values for max_lazy_match, good_match and max_chain_length, depending on |
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116 * the desired pack level (0..9). The values given below have been tuned to |
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117 * exclude worst case performance for pathological files. Better values may be |
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118 * found for specific files. |
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119 */ |
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120 typedef struct config_s { |
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121 ush good_length; /* reduce lazy search above this match length */ |
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122 ush max_lazy; /* do not perform lazy search above this match length */ |
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123 ush nice_length; /* quit search above this match length */ |
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124 ush max_chain; |
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125 compress_func func; |
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126 } config; |
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127 |
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128 #ifdef FASTEST |
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129 local const config configuration_table[2] = { |
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130 /* good lazy nice chain */ |
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131 /* 0 */ {0, 0, 0, 0, deflate_stored}, /* store only */ |
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132 /* 1 */ {4, 4, 8, 4, deflate_fast}}; /* max speed, no lazy matches */ |
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133 #else |
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134 local const config configuration_table[10] = { |
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135 /* good lazy nice chain */ |
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136 /* 0 */ {0, 0, 0, 0, deflate_stored}, /* store only */ |
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137 /* 1 */ {4, 4, 8, 4, deflate_fast}, /* max speed, no lazy matches */ |
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138 /* 2 */ {4, 5, 16, 8, deflate_fast}, |
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139 /* 3 */ {4, 6, 32, 32, deflate_fast}, |
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140 |
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141 /* 4 */ {4, 4, 16, 16, deflate_slow}, /* lazy matches */ |
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142 /* 5 */ {8, 16, 32, 32, deflate_slow}, |
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143 /* 6 */ {8, 16, 128, 128, deflate_slow}, |
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144 /* 7 */ {8, 32, 128, 256, deflate_slow}, |
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145 /* 8 */ {32, 128, 258, 1024, deflate_slow}, |
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146 /* 9 */ {32, 258, 258, 4096, deflate_slow}}; /* max compression */ |
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147 #endif |
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148 |
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149 /* Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4 |
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150 * For deflate_fast() (levels <= 3) good is ignored and lazy has a different |
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151 * meaning. |
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152 */ |
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153 |
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154 /* rank Z_BLOCK between Z_NO_FLUSH and Z_PARTIAL_FLUSH */ |
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155 #define RANK(f) (((f) * 2) - ((f) > 4 ? 9 : 0)) |
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156 |
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157 /* =========================================================================== |
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158 * Update a hash value with the given input byte |
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159 * IN assertion: all calls to UPDATE_HASH are made with consecutive input |
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160 * characters, so that a running hash key can be computed from the previous |
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161 * key instead of complete recalculation each time. |
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162 */ |
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163 #define UPDATE_HASH(s,h,c) (h = (((h)<<s->hash_shift) ^ (c)) & s->hash_mask) |
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164 |
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165 |
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166 /* =========================================================================== |
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167 * Insert string str in the dictionary and set match_head to the previous head |
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168 * of the hash chain (the most recent string with same hash key). Return |
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169 * the previous length of the hash chain. |
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170 * If this file is compiled with -DFASTEST, the compression level is forced |
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171 * to 1, and no hash chains are maintained. |
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172 * IN assertion: all calls to INSERT_STRING are made with consecutive input |
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173 * characters and the first MIN_MATCH bytes of str are valid (except for |
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174 * the last MIN_MATCH-1 bytes of the input file). |
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175 */ |
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176 #ifdef FASTEST |
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177 #define INSERT_STRING(s, str, match_head) \ |
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178 (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \ |
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179 match_head = s->head[s->ins_h], \ |
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180 s->head[s->ins_h] = (Pos)(str)) |
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181 #else |
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182 #define INSERT_STRING(s, str, match_head) \ |
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183 (UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]), \ |
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184 match_head = s->prev[(str) & s->w_mask] = s->head[s->ins_h], \ |
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185 s->head[s->ins_h] = (Pos)(str)) |
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186 #endif |
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187 |
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188 /* =========================================================================== |
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189 * Initialize the hash table (avoiding 64K overflow for 16 bit systems). |
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190 * prev[] will be initialized on the fly. |
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191 */ |
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192 #define CLEAR_HASH(s) \ |
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193 s->head[s->hash_size-1] = NIL; \ |
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194 zmemzero((Bytef *)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head)); |
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195 |
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196 /* =========================================================================== |
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197 * Slide the hash table when sliding the window down (could be avoided with 32 |
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198 * bit values at the expense of memory usage). We slide even when level == 0 to |
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199 * keep the hash table consistent if we switch back to level > 0 later. |
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200 */ |
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201 local void slide_hash(s) |
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202 deflate_state *s; |
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203 { |
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204 unsigned n, m; |
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205 Posf *p; |
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206 uInt wsize = s->w_size; |
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207 |
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208 n = s->hash_size; |
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209 p = &s->head[n]; |
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210 do { |
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211 m = *--p; |
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212 *p = (Pos)(m >= wsize ? m - wsize : NIL); |
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213 } while (--n); |
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214 n = wsize; |
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215 #ifndef FASTEST |
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216 p = &s->prev[n]; |
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217 do { |
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218 m = *--p; |
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219 *p = (Pos)(m >= wsize ? m - wsize : NIL); |
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220 /* If n is not on any hash chain, prev[n] is garbage but |
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221 * its value will never be used. |
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222 */ |
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223 } while (--n); |
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224 #endif |
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225 } |
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226 |
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227 /* ========================================================================= */ |
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228 int ZEXPORT deflateInit_(strm, level, version, stream_size) |
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229 z_streamp strm; |
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230 int level; |
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231 const char *version; |
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232 int stream_size; |
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233 { |
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234 return deflateInit2_(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL, |
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235 Z_DEFAULT_STRATEGY, version, stream_size); |
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236 /* To do: ignore strm->next_in if we use it as window */ |
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237 } |
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238 |
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239 /* ========================================================================= */ |
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240 int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy, |
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241 version, stream_size) |
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242 z_streamp strm; |
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243 int level; |
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244 int method; |
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245 int windowBits; |
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246 int memLevel; |
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247 int strategy; |
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248 const char *version; |
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249 int stream_size; |
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250 { |
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251 deflate_state *s; |
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252 int wrap = 1; |
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253 static const char my_version[] = ZLIB_VERSION; |
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254 |
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255 ushf *overlay; |
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256 /* We overlay pending_buf and d_buf+l_buf. This works since the average |
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257 * output size for (length,distance) codes is <= 24 bits. |
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258 */ |
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259 |
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260 if (version == Z_NULL || version[0] != my_version[0] || |
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261 stream_size != sizeof(z_stream)) { |
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262 return Z_VERSION_ERROR; |
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263 } |
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264 if (strm == Z_NULL) return Z_STREAM_ERROR; |
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265 |
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266 strm->msg = Z_NULL; |
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267 if (strm->zalloc == (alloc_func)0) { |
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268 #ifdef Z_SOLO |
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269 return Z_STREAM_ERROR; |
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270 #else |
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271 strm->zalloc = zcalloc; |
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272 strm->opaque = (voidpf)0; |
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273 #endif |
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274 } |
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275 if (strm->zfree == (free_func)0) |
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276 #ifdef Z_SOLO |
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277 return Z_STREAM_ERROR; |
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278 #else |
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279 strm->zfree = zcfree; |
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280 #endif |
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281 |
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282 #ifdef FASTEST |
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283 if (level != 0) level = 1; |
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284 #else |
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285 if (level == Z_DEFAULT_COMPRESSION) level = 6; |
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286 #endif |
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287 |
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288 if (windowBits < 0) { /* suppress zlib wrapper */ |
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289 wrap = 0; |
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290 windowBits = -windowBits; |
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291 } |
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292 #ifdef GZIP |
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293 else if (windowBits > 15) { |
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294 wrap = 2; /* write gzip wrapper instead */ |
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295 windowBits -= 16; |
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296 } |
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297 #endif |
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298 if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED || |
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299 windowBits < 8 || windowBits > 15 || level < 0 || level > 9 || |
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300 strategy < 0 || strategy > Z_FIXED || (windowBits == 8 && wrap != 1)) { |
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301 return Z_STREAM_ERROR; |
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302 } |
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303 if (windowBits == 8) windowBits = 9; /* until 256-byte window bug fixed */ |
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304 s = (deflate_state *) ZALLOC(strm, 1, sizeof(deflate_state)); |
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305 if (s == Z_NULL) return Z_MEM_ERROR; |
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306 strm->state = (struct internal_state FAR *)s; |
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307 s->strm = strm; |
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308 s->status = INIT_STATE; /* to pass state test in deflateReset() */ |
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309 |
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310 s->wrap = wrap; |
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311 s->gzhead = Z_NULL; |
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312 s->w_bits = (uInt)windowBits; |
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313 s->w_size = 1 << s->w_bits; |
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314 s->w_mask = s->w_size - 1; |
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315 |
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316 s->hash_bits = (uInt)memLevel + 7; |
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317 s->hash_size = 1 << s->hash_bits; |
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318 s->hash_mask = s->hash_size - 1; |
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319 s->hash_shift = ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH); |
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320 |
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321 s->window = (Bytef *) ZALLOC(strm, s->w_size, 2*sizeof(Byte)); |
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322 s->prev = (Posf *) ZALLOC(strm, s->w_size, sizeof(Pos)); |
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323 s->head = (Posf *) ZALLOC(strm, s->hash_size, sizeof(Pos)); |
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324 |
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325 s->high_water = 0; /* nothing written to s->window yet */ |
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|
326 |
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327 s->lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */ |
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|
328 |
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329 overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2); |
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330 s->pending_buf = (uchf *) overlay; |
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331 s->pending_buf_size = (ulg)s->lit_bufsize * (sizeof(ush)+2L); |
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332 |
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|
333 if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL || |
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|
334 s->pending_buf == Z_NULL) { |
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335 s->status = FINISH_STATE; |
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|
336 strm->msg = ERR_MSG(Z_MEM_ERROR); |
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337 deflateEnd (strm); |
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|
338 return Z_MEM_ERROR; |
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|
339 } |
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|
340 s->d_buf = overlay + s->lit_bufsize/sizeof(ush); |
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341 s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize; |
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342 |
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343 s->level = level; |
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344 s->strategy = strategy; |
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345 s->method = (Byte)method; |
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346 |
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347 return deflateReset(strm); |
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348 } |
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349 |
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|
350 /* ========================================================================= |
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351 * Check for a valid deflate stream state. Return 0 if ok, 1 if not. |
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352 */ |
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353 local int deflateStateCheck (strm) |
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354 z_streamp strm; |
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|
355 { |
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356 deflate_state *s; |
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357 if (strm == Z_NULL || |
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|
358 strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0) |
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359 return 1; |
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|
360 s = strm->state; |
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361 if (s == Z_NULL || s->strm != strm || (s->status != INIT_STATE && |
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|
362 #ifdef GZIP |
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363 s->status != GZIP_STATE && |
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|
364 #endif |
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|
365 s->status != EXTRA_STATE && |
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366 s->status != NAME_STATE && |
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|
367 s->status != COMMENT_STATE && |
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|
368 s->status != HCRC_STATE && |
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369 s->status != BUSY_STATE && |
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|
370 s->status != FINISH_STATE)) |
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|
371 return 1; |
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372 return 0; |
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|
373 } |
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|
374 |
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375 /* ========================================================================= */ |
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376 int ZEXPORT deflateSetDictionary (strm, dictionary, dictLength) |
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377 z_streamp strm; |
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parents:
diff
changeset
|
378 const Bytef *dictionary; |
00d788dac91a
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parents:
diff
changeset
|
379 uInt dictLength; |
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parents:
diff
changeset
|
380 { |
00d788dac91a
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parents:
diff
changeset
|
381 deflate_state *s; |
00d788dac91a
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parents:
diff
changeset
|
382 uInt str, n; |
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parents:
diff
changeset
|
383 int wrap; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
384 unsigned avail; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
385 z_const unsigned char *next; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
386 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
387 if (deflateStateCheck(strm) || dictionary == Z_NULL) |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
388 return Z_STREAM_ERROR; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
389 s = strm->state; |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
390 wrap = s->wrap; |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
391 if (wrap == 2 || (wrap == 1 && s->status != INIT_STATE) || s->lookahead) |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
392 return Z_STREAM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
393 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
394 /* when using zlib wrappers, compute Adler-32 for provided dictionary */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
395 if (wrap == 1) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
396 strm->adler = adler32(strm->adler, dictionary, dictLength); |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
397 s->wrap = 0; /* avoid computing Adler-32 in read_buf */ |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
398 |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
399 /* if dictionary would fill window, just replace the history */ |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
400 if (dictLength >= s->w_size) { |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
401 if (wrap == 0) { /* already empty otherwise */ |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
402 CLEAR_HASH(s); |
00d788dac91a
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parents:
diff
changeset
|
403 s->strstart = 0; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
404 s->block_start = 0L; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
405 s->insert = 0; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
406 } |
00d788dac91a
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parents:
diff
changeset
|
407 dictionary += dictLength - s->w_size; /* use the tail */ |
00d788dac91a
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parents:
diff
changeset
|
408 dictLength = s->w_size; |
00d788dac91a
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parents:
diff
changeset
|
409 } |
00d788dac91a
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parents:
diff
changeset
|
410 |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
411 /* insert dictionary into window and hash */ |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
412 avail = strm->avail_in; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
413 next = strm->next_in; |
00d788dac91a
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parents:
diff
changeset
|
414 strm->avail_in = dictLength; |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
415 strm->next_in = (z_const Bytef *)dictionary; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
416 fill_window(s); |
00d788dac91a
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parents:
diff
changeset
|
417 while (s->lookahead >= MIN_MATCH) { |
00d788dac91a
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parents:
diff
changeset
|
418 str = s->strstart; |
00d788dac91a
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parents:
diff
changeset
|
419 n = s->lookahead - (MIN_MATCH-1); |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
420 do { |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
421 UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
422 #ifndef FASTEST |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
423 s->prev[str & s->w_mask] = s->head[s->ins_h]; |
00d788dac91a
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parents:
diff
changeset
|
424 #endif |
00d788dac91a
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parents:
diff
changeset
|
425 s->head[s->ins_h] = (Pos)str; |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
426 str++; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
427 } while (--n); |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
428 s->strstart = str; |
00d788dac91a
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parents:
diff
changeset
|
429 s->lookahead = MIN_MATCH-1; |
00d788dac91a
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parents:
diff
changeset
|
430 fill_window(s); |
00d788dac91a
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parents:
diff
changeset
|
431 } |
00d788dac91a
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parents:
diff
changeset
|
432 s->strstart += s->lookahead; |
00d788dac91a
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parents:
diff
changeset
|
433 s->block_start = (long)s->strstart; |
00d788dac91a
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parents:
diff
changeset
|
434 s->insert = s->lookahead; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
435 s->lookahead = 0; |
00d788dac91a
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parents:
diff
changeset
|
436 s->match_length = s->prev_length = MIN_MATCH-1; |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
437 s->match_available = 0; |
00d788dac91a
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parents:
diff
changeset
|
438 strm->next_in = next; |
00d788dac91a
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parents:
diff
changeset
|
439 strm->avail_in = avail; |
00d788dac91a
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parents:
diff
changeset
|
440 s->wrap = wrap; |
00d788dac91a
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parents:
diff
changeset
|
441 return Z_OK; |
00d788dac91a
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parents:
diff
changeset
|
442 } |
00d788dac91a
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parents:
diff
changeset
|
443 |
00d788dac91a
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parents:
diff
changeset
|
444 /* ========================================================================= */ |
00d788dac91a
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parents:
diff
changeset
|
445 int ZEXPORT deflateGetDictionary (strm, dictionary, dictLength) |
00d788dac91a
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parents:
diff
changeset
|
446 z_streamp strm; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
447 Bytef *dictionary; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
448 uInt *dictLength; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
449 { |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
450 deflate_state *s; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
451 uInt len; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
452 |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
453 if (deflateStateCheck(strm)) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
454 return Z_STREAM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
455 s = strm->state; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
456 len = s->strstart + s->lookahead; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
457 if (len > s->w_size) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
458 len = s->w_size; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
459 if (dictionary != Z_NULL && len) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
460 zmemcpy(dictionary, s->window + s->strstart + s->lookahead - len, len); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
461 if (dictLength != Z_NULL) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
462 *dictLength = len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
463 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
464 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
465 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
466 /* ========================================================================= */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
467 int ZEXPORT deflateResetKeep (strm) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
468 z_streamp strm; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
469 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
470 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
471 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
472 if (deflateStateCheck(strm)) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
473 return Z_STREAM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
474 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
475 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
476 strm->total_in = strm->total_out = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
477 strm->msg = Z_NULL; /* use zfree if we ever allocate msg dynamically */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
478 strm->data_type = Z_UNKNOWN; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
479 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
480 s = (deflate_state *)strm->state; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
481 s->pending = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
482 s->pending_out = s->pending_buf; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
483 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
484 if (s->wrap < 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
485 s->wrap = -s->wrap; /* was made negative by deflate(..., Z_FINISH); */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
486 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
487 s->status = |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
488 #ifdef GZIP |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
489 s->wrap == 2 ? GZIP_STATE : |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
490 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
491 s->wrap ? INIT_STATE : BUSY_STATE; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
492 strm->adler = |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
493 #ifdef GZIP |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
494 s->wrap == 2 ? crc32(0L, Z_NULL, 0) : |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
495 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
496 adler32(0L, Z_NULL, 0); |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
497 s->last_flush = Z_NO_FLUSH; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
498 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
499 _tr_init(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
500 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
501 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
502 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
503 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
504 /* ========================================================================= */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
505 int ZEXPORT deflateReset (strm) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
506 z_streamp strm; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
507 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
508 int ret; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
509 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
510 ret = deflateResetKeep(strm); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
511 if (ret == Z_OK) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
512 lm_init(strm->state); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
513 return ret; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
514 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
515 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
516 /* ========================================================================= */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
517 int ZEXPORT deflateSetHeader (strm, head) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
518 z_streamp strm; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
519 gz_headerp head; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
520 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
521 if (deflateStateCheck(strm) || strm->state->wrap != 2) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
522 return Z_STREAM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
523 strm->state->gzhead = head; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
524 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
525 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
526 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
527 /* ========================================================================= */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
528 int ZEXPORT deflatePending (strm, pending, bits) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
529 unsigned *pending; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
530 int *bits; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
531 z_streamp strm; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
532 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
533 if (deflateStateCheck(strm)) return Z_STREAM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
534 if (pending != Z_NULL) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
535 *pending = strm->state->pending; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
536 if (bits != Z_NULL) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
537 *bits = strm->state->bi_valid; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
538 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
539 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
540 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
541 /* ========================================================================= */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
542 int ZEXPORT deflatePrime (strm, bits, value) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
543 z_streamp strm; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
544 int bits; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
545 int value; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
546 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
547 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
548 int put; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
549 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
550 if (deflateStateCheck(strm)) return Z_STREAM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
551 s = strm->state; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
552 if ((Bytef *)(s->d_buf) < s->pending_out + ((Buf_size + 7) >> 3)) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
553 return Z_BUF_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
554 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
555 put = Buf_size - s->bi_valid; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
556 if (put > bits) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
557 put = bits; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
558 s->bi_buf |= (ush)((value & ((1 << put) - 1)) << s->bi_valid); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
559 s->bi_valid += put; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
560 _tr_flush_bits(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
561 value >>= put; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
562 bits -= put; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
563 } while (bits); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
564 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
565 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
566 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
567 /* ========================================================================= */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
568 int ZEXPORT deflateParams(strm, level, strategy) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
569 z_streamp strm; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
570 int level; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
571 int strategy; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
572 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
573 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
574 compress_func func; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
575 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
576 if (deflateStateCheck(strm)) return Z_STREAM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
577 s = strm->state; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
578 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
579 #ifdef FASTEST |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
580 if (level != 0) level = 1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
581 #else |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
582 if (level == Z_DEFAULT_COMPRESSION) level = 6; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
583 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
584 if (level < 0 || level > 9 || strategy < 0 || strategy > Z_FIXED) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
585 return Z_STREAM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
586 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
587 func = configuration_table[s->level].func; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
588 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
589 if ((strategy != s->strategy || func != configuration_table[level].func) && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
590 s->high_water) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
591 /* Flush the last buffer: */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
592 int err = deflate(strm, Z_BLOCK); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
593 if (err == Z_STREAM_ERROR) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
594 return err; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
595 if (strm->avail_out == 0) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
596 return Z_BUF_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
597 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
598 if (s->level != level) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
599 if (s->level == 0 && s->matches != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
600 if (s->matches == 1) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
601 slide_hash(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
602 else |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
603 CLEAR_HASH(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
604 s->matches = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
605 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
606 s->level = level; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
607 s->max_lazy_match = configuration_table[level].max_lazy; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
608 s->good_match = configuration_table[level].good_length; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
609 s->nice_match = configuration_table[level].nice_length; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
610 s->max_chain_length = configuration_table[level].max_chain; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
611 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
612 s->strategy = strategy; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
613 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
614 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
615 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
616 /* ========================================================================= */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
617 int ZEXPORT deflateTune(strm, good_length, max_lazy, nice_length, max_chain) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
618 z_streamp strm; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
619 int good_length; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
620 int max_lazy; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
621 int nice_length; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
622 int max_chain; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
623 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
624 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
625 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
626 if (deflateStateCheck(strm)) return Z_STREAM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
627 s = strm->state; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
628 s->good_match = (uInt)good_length; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
629 s->max_lazy_match = (uInt)max_lazy; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
630 s->nice_match = nice_length; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
631 s->max_chain_length = (uInt)max_chain; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
632 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
633 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
634 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
635 /* ========================================================================= |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
636 * For the default windowBits of 15 and memLevel of 8, this function returns |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
637 * a close to exact, as well as small, upper bound on the compressed size. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
638 * They are coded as constants here for a reason--if the #define's are |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
639 * changed, then this function needs to be changed as well. The return |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
640 * value for 15 and 8 only works for those exact settings. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
641 * |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
642 * For any setting other than those defaults for windowBits and memLevel, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
643 * the value returned is a conservative worst case for the maximum expansion |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
644 * resulting from using fixed blocks instead of stored blocks, which deflate |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
645 * can emit on compressed data for some combinations of the parameters. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
646 * |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
647 * This function could be more sophisticated to provide closer upper bounds for |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
648 * every combination of windowBits and memLevel. But even the conservative |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
649 * upper bound of about 14% expansion does not seem onerous for output buffer |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
650 * allocation. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
651 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
652 uLong ZEXPORT deflateBound(strm, sourceLen) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
653 z_streamp strm; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
654 uLong sourceLen; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
655 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
656 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
657 uLong complen, wraplen; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
658 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
659 /* conservative upper bound for compressed data */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
660 complen = sourceLen + |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
661 ((sourceLen + 7) >> 3) + ((sourceLen + 63) >> 6) + 5; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
662 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
663 /* if can't get parameters, return conservative bound plus zlib wrapper */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
664 if (deflateStateCheck(strm)) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
665 return complen + 6; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
666 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
667 /* compute wrapper length */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
668 s = strm->state; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
669 switch (s->wrap) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
670 case 0: /* raw deflate */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
671 wraplen = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
672 break; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
673 case 1: /* zlib wrapper */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
674 wraplen = 6 + (s->strstart ? 4 : 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
675 break; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
676 #ifdef GZIP |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
677 case 2: /* gzip wrapper */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
678 wraplen = 18; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
679 if (s->gzhead != Z_NULL) { /* user-supplied gzip header */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
680 Bytef *str; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
681 if (s->gzhead->extra != Z_NULL) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
682 wraplen += 2 + s->gzhead->extra_len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
683 str = s->gzhead->name; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
684 if (str != Z_NULL) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
685 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
686 wraplen++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
687 } while (*str++); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
688 str = s->gzhead->comment; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
689 if (str != Z_NULL) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
690 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
691 wraplen++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
692 } while (*str++); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
693 if (s->gzhead->hcrc) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
694 wraplen += 2; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
695 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
696 break; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
697 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
698 default: /* for compiler happiness */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
699 wraplen = 6; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
700 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
701 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
702 /* if not default parameters, return conservative bound */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
703 if (s->w_bits != 15 || s->hash_bits != 8 + 7) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
704 return complen + wraplen; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
705 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
706 /* default settings: return tight bound for that case */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
707 return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
708 (sourceLen >> 25) + 13 - 6 + wraplen; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
709 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
710 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
711 /* ========================================================================= |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
712 * Put a short in the pending buffer. The 16-bit value is put in MSB order. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
713 * IN assertion: the stream state is correct and there is enough room in |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
714 * pending_buf. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
715 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
716 local void putShortMSB (s, b) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
717 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
718 uInt b; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
719 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
720 put_byte(s, (Byte)(b >> 8)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
721 put_byte(s, (Byte)(b & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
722 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
723 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
724 /* ========================================================================= |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
725 * Flush as much pending output as possible. All deflate() output, except for |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
726 * some deflate_stored() output, goes through this function so some |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
727 * applications may wish to modify it to avoid allocating a large |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
728 * strm->next_out buffer and copying into it. (See also read_buf()). |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
729 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
730 local void flush_pending(strm) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
731 z_streamp strm; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
732 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
733 unsigned len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
734 deflate_state *s = strm->state; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
735 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
736 _tr_flush_bits(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
737 len = s->pending; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
738 if (len > strm->avail_out) len = strm->avail_out; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
739 if (len == 0) return; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
740 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
741 zmemcpy(strm->next_out, s->pending_out, len); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
742 strm->next_out += len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
743 s->pending_out += len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
744 strm->total_out += len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
745 strm->avail_out -= len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
746 s->pending -= len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
747 if (s->pending == 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
748 s->pending_out = s->pending_buf; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
749 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
750 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
751 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
752 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
753 * Update the header CRC with the bytes s->pending_buf[beg..s->pending - 1]. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
754 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
755 #define HCRC_UPDATE(beg) \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
756 do { \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
757 if (s->gzhead->hcrc && s->pending > (beg)) \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
758 strm->adler = crc32(strm->adler, s->pending_buf + (beg), \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
759 s->pending - (beg)); \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
760 } while (0) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
761 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
762 /* ========================================================================= */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
763 int ZEXPORT deflate (strm, flush) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
764 z_streamp strm; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
765 int flush; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
766 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
767 int old_flush; /* value of flush param for previous deflate call */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
768 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
769 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
770 if (deflateStateCheck(strm) || flush > Z_BLOCK || flush < 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
771 return Z_STREAM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
772 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
773 s = strm->state; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
774 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
775 if (strm->next_out == Z_NULL || |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
776 (strm->avail_in != 0 && strm->next_in == Z_NULL) || |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
777 (s->status == FINISH_STATE && flush != Z_FINISH)) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
778 ERR_RETURN(strm, Z_STREAM_ERROR); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
779 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
780 if (strm->avail_out == 0) ERR_RETURN(strm, Z_BUF_ERROR); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
781 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
782 old_flush = s->last_flush; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
783 s->last_flush = flush; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
784 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
785 /* Flush as much pending output as possible */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
786 if (s->pending != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
787 flush_pending(strm); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
788 if (strm->avail_out == 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
789 /* Since avail_out is 0, deflate will be called again with |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
790 * more output space, but possibly with both pending and |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
791 * avail_in equal to zero. There won't be anything to do, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
792 * but this is not an error situation so make sure we |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
793 * return OK instead of BUF_ERROR at next call of deflate: |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
794 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
795 s->last_flush = -1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
796 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
797 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
798 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
799 /* Make sure there is something to do and avoid duplicate consecutive |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
800 * flushes. For repeated and useless calls with Z_FINISH, we keep |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
801 * returning Z_STREAM_END instead of Z_BUF_ERROR. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
802 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
803 } else if (strm->avail_in == 0 && RANK(flush) <= RANK(old_flush) && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
804 flush != Z_FINISH) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
805 ERR_RETURN(strm, Z_BUF_ERROR); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
806 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
807 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
808 /* User must not provide more input after the first FINISH: */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
809 if (s->status == FINISH_STATE && strm->avail_in != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
810 ERR_RETURN(strm, Z_BUF_ERROR); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
811 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
812 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
813 /* Write the header */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
814 if (s->status == INIT_STATE) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
815 /* zlib header */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
816 uInt header = (Z_DEFLATED + ((s->w_bits-8)<<4)) << 8; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
817 uInt level_flags; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
818 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
819 if (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
820 level_flags = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
821 else if (s->level < 6) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
822 level_flags = 1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
823 else if (s->level == 6) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
824 level_flags = 2; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
825 else |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
826 level_flags = 3; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
827 header |= (level_flags << 6); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
828 if (s->strstart != 0) header |= PRESET_DICT; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
829 header += 31 - (header % 31); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
830 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
831 putShortMSB(s, header); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
832 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
833 /* Save the adler32 of the preset dictionary: */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
834 if (s->strstart != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
835 putShortMSB(s, (uInt)(strm->adler >> 16)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
836 putShortMSB(s, (uInt)(strm->adler & 0xffff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
837 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
838 strm->adler = adler32(0L, Z_NULL, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
839 s->status = BUSY_STATE; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
840 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
841 /* Compression must start with an empty pending buffer */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
842 flush_pending(strm); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
843 if (s->pending != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
844 s->last_flush = -1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
845 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
846 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
847 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
848 #ifdef GZIP |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
849 if (s->status == GZIP_STATE) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
850 /* gzip header */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
851 strm->adler = crc32(0L, Z_NULL, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
852 put_byte(s, 31); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
853 put_byte(s, 139); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
854 put_byte(s, 8); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
855 if (s->gzhead == Z_NULL) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
856 put_byte(s, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
857 put_byte(s, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
858 put_byte(s, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
859 put_byte(s, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
860 put_byte(s, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
861 put_byte(s, s->level == 9 ? 2 : |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
862 (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ? |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
863 4 : 0)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
864 put_byte(s, OS_CODE); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
865 s->status = BUSY_STATE; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
866 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
867 /* Compression must start with an empty pending buffer */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
868 flush_pending(strm); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
869 if (s->pending != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
870 s->last_flush = -1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
871 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
872 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
873 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
874 else { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
875 put_byte(s, (s->gzhead->text ? 1 : 0) + |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
876 (s->gzhead->hcrc ? 2 : 0) + |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
877 (s->gzhead->extra == Z_NULL ? 0 : 4) + |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
878 (s->gzhead->name == Z_NULL ? 0 : 8) + |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
879 (s->gzhead->comment == Z_NULL ? 0 : 16) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
880 ); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
881 put_byte(s, (Byte)(s->gzhead->time & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
882 put_byte(s, (Byte)((s->gzhead->time >> 8) & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
883 put_byte(s, (Byte)((s->gzhead->time >> 16) & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
884 put_byte(s, (Byte)((s->gzhead->time >> 24) & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
885 put_byte(s, s->level == 9 ? 2 : |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
886 (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ? |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
887 4 : 0)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
888 put_byte(s, s->gzhead->os & 0xff); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
889 if (s->gzhead->extra != Z_NULL) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
890 put_byte(s, s->gzhead->extra_len & 0xff); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
891 put_byte(s, (s->gzhead->extra_len >> 8) & 0xff); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
892 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
893 if (s->gzhead->hcrc) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
894 strm->adler = crc32(strm->adler, s->pending_buf, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
895 s->pending); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
896 s->gzindex = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
897 s->status = EXTRA_STATE; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
898 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
899 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
900 if (s->status == EXTRA_STATE) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
901 if (s->gzhead->extra != Z_NULL) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
902 ulg beg = s->pending; /* start of bytes to update crc */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
903 uInt left = (s->gzhead->extra_len & 0xffff) - s->gzindex; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
904 while (s->pending + left > s->pending_buf_size) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
905 uInt copy = s->pending_buf_size - s->pending; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
906 zmemcpy(s->pending_buf + s->pending, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
907 s->gzhead->extra + s->gzindex, copy); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
908 s->pending = s->pending_buf_size; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
909 HCRC_UPDATE(beg); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
910 s->gzindex += copy; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
911 flush_pending(strm); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
912 if (s->pending != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
913 s->last_flush = -1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
914 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
915 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
916 beg = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
917 left -= copy; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
918 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
919 zmemcpy(s->pending_buf + s->pending, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
920 s->gzhead->extra + s->gzindex, left); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
921 s->pending += left; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
922 HCRC_UPDATE(beg); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
923 s->gzindex = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
924 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
925 s->status = NAME_STATE; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
926 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
927 if (s->status == NAME_STATE) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
928 if (s->gzhead->name != Z_NULL) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
929 ulg beg = s->pending; /* start of bytes to update crc */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
930 int val; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
931 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
932 if (s->pending == s->pending_buf_size) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
933 HCRC_UPDATE(beg); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
934 flush_pending(strm); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
935 if (s->pending != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
936 s->last_flush = -1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
937 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
938 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
939 beg = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
940 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
941 val = s->gzhead->name[s->gzindex++]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
942 put_byte(s, val); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
943 } while (val != 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
944 HCRC_UPDATE(beg); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
945 s->gzindex = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
946 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
947 s->status = COMMENT_STATE; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
948 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
949 if (s->status == COMMENT_STATE) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
950 if (s->gzhead->comment != Z_NULL) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
951 ulg beg = s->pending; /* start of bytes to update crc */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
952 int val; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
953 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
954 if (s->pending == s->pending_buf_size) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
955 HCRC_UPDATE(beg); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
956 flush_pending(strm); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
957 if (s->pending != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
958 s->last_flush = -1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
959 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
960 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
961 beg = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
962 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
963 val = s->gzhead->comment[s->gzindex++]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
964 put_byte(s, val); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
965 } while (val != 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
966 HCRC_UPDATE(beg); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
967 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
968 s->status = HCRC_STATE; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
969 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
970 if (s->status == HCRC_STATE) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
971 if (s->gzhead->hcrc) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
972 if (s->pending + 2 > s->pending_buf_size) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
973 flush_pending(strm); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
974 if (s->pending != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
975 s->last_flush = -1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
976 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
977 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
978 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
979 put_byte(s, (Byte)(strm->adler & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
980 put_byte(s, (Byte)((strm->adler >> 8) & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
981 strm->adler = crc32(0L, Z_NULL, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
982 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
983 s->status = BUSY_STATE; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
984 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
985 /* Compression must start with an empty pending buffer */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
986 flush_pending(strm); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
987 if (s->pending != 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
988 s->last_flush = -1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
989 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
990 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
991 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
992 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
993 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
994 /* Start a new block or continue the current one. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
995 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
996 if (strm->avail_in != 0 || s->lookahead != 0 || |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
997 (flush != Z_NO_FLUSH && s->status != FINISH_STATE)) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
998 block_state bstate; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
999 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1000 bstate = s->level == 0 ? deflate_stored(s, flush) : |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1001 s->strategy == Z_HUFFMAN_ONLY ? deflate_huff(s, flush) : |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1002 s->strategy == Z_RLE ? deflate_rle(s, flush) : |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1003 (*(configuration_table[s->level].func))(s, flush); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1004 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1005 if (bstate == finish_started || bstate == finish_done) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1006 s->status = FINISH_STATE; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1007 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1008 if (bstate == need_more || bstate == finish_started) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1009 if (strm->avail_out == 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1010 s->last_flush = -1; /* avoid BUF_ERROR next call, see above */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1011 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1012 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1013 /* If flush != Z_NO_FLUSH && avail_out == 0, the next call |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1014 * of deflate should use the same flush parameter to make sure |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1015 * that the flush is complete. So we don't have to output an |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1016 * empty block here, this will be done at next call. This also |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1017 * ensures that for a very small output buffer, we emit at most |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1018 * one empty block. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1019 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1020 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1021 if (bstate == block_done) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1022 if (flush == Z_PARTIAL_FLUSH) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1023 _tr_align(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1024 } else if (flush != Z_BLOCK) { /* FULL_FLUSH or SYNC_FLUSH */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1025 _tr_stored_block(s, (char*)0, 0L, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1026 /* For a full flush, this empty block will be recognized |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1027 * as a special marker by inflate_sync(). |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1028 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1029 if (flush == Z_FULL_FLUSH) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1030 CLEAR_HASH(s); /* forget history */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1031 if (s->lookahead == 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1032 s->strstart = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1033 s->block_start = 0L; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1034 s->insert = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1035 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1036 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1037 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1038 flush_pending(strm); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1039 if (strm->avail_out == 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1040 s->last_flush = -1; /* avoid BUF_ERROR at next call, see above */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1041 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1042 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1043 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1044 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1045 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1046 if (flush != Z_FINISH) return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1047 if (s->wrap <= 0) return Z_STREAM_END; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1048 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1049 /* Write the trailer */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1050 #ifdef GZIP |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1051 if (s->wrap == 2) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1052 put_byte(s, (Byte)(strm->adler & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1053 put_byte(s, (Byte)((strm->adler >> 8) & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1054 put_byte(s, (Byte)((strm->adler >> 16) & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1055 put_byte(s, (Byte)((strm->adler >> 24) & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1056 put_byte(s, (Byte)(strm->total_in & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1057 put_byte(s, (Byte)((strm->total_in >> 8) & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1058 put_byte(s, (Byte)((strm->total_in >> 16) & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1059 put_byte(s, (Byte)((strm->total_in >> 24) & 0xff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1060 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1061 else |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1062 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1063 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1064 putShortMSB(s, (uInt)(strm->adler >> 16)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1065 putShortMSB(s, (uInt)(strm->adler & 0xffff)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1066 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1067 flush_pending(strm); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1068 /* If avail_out is zero, the application will call deflate again |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1069 * to flush the rest. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1070 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1071 if (s->wrap > 0) s->wrap = -s->wrap; /* write the trailer only once! */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1072 return s->pending != 0 ? Z_OK : Z_STREAM_END; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1073 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1074 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1075 /* ========================================================================= */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1076 int ZEXPORT deflateEnd (strm) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1077 z_streamp strm; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1078 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1079 int status; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1080 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1081 if (deflateStateCheck(strm)) return Z_STREAM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1082 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1083 status = strm->state->status; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1084 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1085 /* Deallocate in reverse order of allocations: */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1086 TRY_FREE(strm, strm->state->pending_buf); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1087 TRY_FREE(strm, strm->state->head); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1088 TRY_FREE(strm, strm->state->prev); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1089 TRY_FREE(strm, strm->state->window); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1090 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1091 ZFREE(strm, strm->state); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1092 strm->state = Z_NULL; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1093 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1094 return status == BUSY_STATE ? Z_DATA_ERROR : Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1095 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1096 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1097 /* ========================================================================= |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1098 * Copy the source state to the destination state. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1099 * To simplify the source, this is not supported for 16-bit MSDOS (which |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1100 * doesn't have enough memory anyway to duplicate compression states). |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1101 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1102 int ZEXPORT deflateCopy (dest, source) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1103 z_streamp dest; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1104 z_streamp source; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1105 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1106 #ifdef MAXSEG_64K |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1107 return Z_STREAM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1108 #else |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1109 deflate_state *ds; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1110 deflate_state *ss; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1111 ushf *overlay; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1112 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1113 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1114 if (deflateStateCheck(source) || dest == Z_NULL) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1115 return Z_STREAM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1116 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1117 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1118 ss = source->state; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1119 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1120 zmemcpy((voidpf)dest, (voidpf)source, sizeof(z_stream)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1121 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1122 ds = (deflate_state *) ZALLOC(dest, 1, sizeof(deflate_state)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1123 if (ds == Z_NULL) return Z_MEM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1124 dest->state = (struct internal_state FAR *) ds; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1125 zmemcpy((voidpf)ds, (voidpf)ss, sizeof(deflate_state)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1126 ds->strm = dest; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1127 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1128 ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1129 ds->prev = (Posf *) ZALLOC(dest, ds->w_size, sizeof(Pos)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1130 ds->head = (Posf *) ZALLOC(dest, ds->hash_size, sizeof(Pos)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1131 overlay = (ushf *) ZALLOC(dest, ds->lit_bufsize, sizeof(ush)+2); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1132 ds->pending_buf = (uchf *) overlay; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1133 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1134 if (ds->window == Z_NULL || ds->prev == Z_NULL || ds->head == Z_NULL || |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1135 ds->pending_buf == Z_NULL) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1136 deflateEnd (dest); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1137 return Z_MEM_ERROR; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1138 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1139 /* following zmemcpy do not work for 16-bit MSDOS */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1140 zmemcpy(ds->window, ss->window, ds->w_size * 2 * sizeof(Byte)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1141 zmemcpy((voidpf)ds->prev, (voidpf)ss->prev, ds->w_size * sizeof(Pos)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1142 zmemcpy((voidpf)ds->head, (voidpf)ss->head, ds->hash_size * sizeof(Pos)); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1143 zmemcpy(ds->pending_buf, ss->pending_buf, (uInt)ds->pending_buf_size); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1144 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1145 ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1146 ds->d_buf = overlay + ds->lit_bufsize/sizeof(ush); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1147 ds->l_buf = ds->pending_buf + (1+sizeof(ush))*ds->lit_bufsize; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1148 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1149 ds->l_desc.dyn_tree = ds->dyn_ltree; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1150 ds->d_desc.dyn_tree = ds->dyn_dtree; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1151 ds->bl_desc.dyn_tree = ds->bl_tree; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1152 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1153 return Z_OK; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1154 #endif /* MAXSEG_64K */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1155 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1156 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1157 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1158 * Read a new buffer from the current input stream, update the adler32 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1159 * and total number of bytes read. All deflate() input goes through |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1160 * this function so some applications may wish to modify it to avoid |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1161 * allocating a large strm->next_in buffer and copying from it. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1162 * (See also flush_pending()). |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1163 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1164 local unsigned read_buf(strm, buf, size) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1165 z_streamp strm; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1166 Bytef *buf; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1167 unsigned size; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1168 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1169 unsigned len = strm->avail_in; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1170 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1171 if (len > size) len = size; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1172 if (len == 0) return 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1173 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1174 strm->avail_in -= len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1175 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1176 zmemcpy(buf, strm->next_in, len); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1177 if (strm->state->wrap == 1) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1178 strm->adler = adler32(strm->adler, buf, len); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1179 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1180 #ifdef GZIP |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1181 else if (strm->state->wrap == 2) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1182 strm->adler = crc32(strm->adler, buf, len); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1183 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1184 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1185 strm->next_in += len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1186 strm->total_in += len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1187 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1188 return len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1189 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1190 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1191 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1192 * Initialize the "longest match" routines for a new zlib stream |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1193 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1194 local void lm_init (s) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1195 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1196 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1197 s->window_size = (ulg)2L*s->w_size; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1198 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1199 CLEAR_HASH(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1200 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1201 /* Set the default configuration parameters: |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1202 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1203 s->max_lazy_match = configuration_table[s->level].max_lazy; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1204 s->good_match = configuration_table[s->level].good_length; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1205 s->nice_match = configuration_table[s->level].nice_length; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1206 s->max_chain_length = configuration_table[s->level].max_chain; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1207 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1208 s->strstart = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1209 s->block_start = 0L; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1210 s->lookahead = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1211 s->insert = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1212 s->match_length = s->prev_length = MIN_MATCH-1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1213 s->match_available = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1214 s->ins_h = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1215 #ifndef FASTEST |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1216 #ifdef ASMV |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1217 match_init(); /* initialize the asm code */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1218 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1219 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1220 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1221 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1222 #ifndef FASTEST |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1223 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1224 * Set match_start to the longest match starting at the given string and |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1225 * return its length. Matches shorter or equal to prev_length are discarded, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1226 * in which case the result is equal to prev_length and match_start is |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1227 * garbage. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1228 * IN assertions: cur_match is the head of the hash chain for the current |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1229 * string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1230 * OUT assertion: the match length is not greater than s->lookahead. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1231 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1232 #ifndef ASMV |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1233 /* For 80x86 and 680x0, an optimized version will be provided in match.asm or |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1234 * match.S. The code will be functionally equivalent. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1235 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1236 local uInt longest_match(s, cur_match) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1237 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1238 IPos cur_match; /* current match */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1239 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1240 unsigned chain_length = s->max_chain_length;/* max hash chain length */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1241 register Bytef *scan = s->window + s->strstart; /* current string */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1242 register Bytef *match; /* matched string */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1243 register int len; /* length of current match */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1244 int best_len = (int)s->prev_length; /* best match length so far */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1245 int nice_match = s->nice_match; /* stop if match long enough */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1246 IPos limit = s->strstart > (IPos)MAX_DIST(s) ? |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1247 s->strstart - (IPos)MAX_DIST(s) : NIL; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1248 /* Stop when cur_match becomes <= limit. To simplify the code, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1249 * we prevent matches with the string of window index 0. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1250 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1251 Posf *prev = s->prev; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1252 uInt wmask = s->w_mask; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1253 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1254 #ifdef UNALIGNED_OK |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1255 /* Compare two bytes at a time. Note: this is not always beneficial. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1256 * Try with and without -DUNALIGNED_OK to check. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1257 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1258 register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1259 register ush scan_start = *(ushf*)scan; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1260 register ush scan_end = *(ushf*)(scan+best_len-1); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1261 #else |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1262 register Bytef *strend = s->window + s->strstart + MAX_MATCH; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1263 register Byte scan_end1 = scan[best_len-1]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1264 register Byte scan_end = scan[best_len]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1265 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1266 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1267 /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1268 * It is easy to get rid of this optimization if necessary. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1269 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1270 Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1271 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1272 /* Do not waste too much time if we already have a good match: */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1273 if (s->prev_length >= s->good_match) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1274 chain_length >>= 2; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1275 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1276 /* Do not look for matches beyond the end of the input. This is necessary |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1277 * to make deflate deterministic. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1278 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1279 if ((uInt)nice_match > s->lookahead) nice_match = (int)s->lookahead; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1280 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1281 Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1282 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1283 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1284 Assert(cur_match < s->strstart, "no future"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1285 match = s->window + cur_match; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1286 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1287 /* Skip to next match if the match length cannot increase |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1288 * or if the match length is less than 2. Note that the checks below |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1289 * for insufficient lookahead only occur occasionally for performance |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1290 * reasons. Therefore uninitialized memory will be accessed, and |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1291 * conditional jumps will be made that depend on those values. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1292 * However the length of the match is limited to the lookahead, so |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1293 * the output of deflate is not affected by the uninitialized values. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1294 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1295 #if (defined(UNALIGNED_OK) && MAX_MATCH == 258) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1296 /* This code assumes sizeof(unsigned short) == 2. Do not use |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1297 * UNALIGNED_OK if your compiler uses a different size. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1298 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1299 if (*(ushf*)(match+best_len-1) != scan_end || |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1300 *(ushf*)match != scan_start) continue; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1301 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1302 /* It is not necessary to compare scan[2] and match[2] since they are |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1303 * always equal when the other bytes match, given that the hash keys |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1304 * are equal and that HASH_BITS >= 8. Compare 2 bytes at a time at |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1305 * strstart+3, +5, ... up to strstart+257. We check for insufficient |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1306 * lookahead only every 4th comparison; the 128th check will be made |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1307 * at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1308 * necessary to put more guard bytes at the end of the window, or |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1309 * to check more often for insufficient lookahead. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1310 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1311 Assert(scan[2] == match[2], "scan[2]?"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1312 scan++, match++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1313 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1314 } while (*(ushf*)(scan+=2) == *(ushf*)(match+=2) && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1315 *(ushf*)(scan+=2) == *(ushf*)(match+=2) && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1316 *(ushf*)(scan+=2) == *(ushf*)(match+=2) && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1317 *(ushf*)(scan+=2) == *(ushf*)(match+=2) && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1318 scan < strend); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1319 /* The funny "do {}" generates better code on most compilers */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1320 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1321 /* Here, scan <= window+strstart+257 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1322 Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1323 if (*scan == *match) scan++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1324 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1325 len = (MAX_MATCH - 1) - (int)(strend-scan); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1326 scan = strend - (MAX_MATCH-1); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1327 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1328 #else /* UNALIGNED_OK */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1329 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1330 if (match[best_len] != scan_end || |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1331 match[best_len-1] != scan_end1 || |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1332 *match != *scan || |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1333 *++match != scan[1]) continue; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1334 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1335 /* The check at best_len-1 can be removed because it will be made |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1336 * again later. (This heuristic is not always a win.) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1337 * It is not necessary to compare scan[2] and match[2] since they |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1338 * are always equal when the other bytes match, given that |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1339 * the hash keys are equal and that HASH_BITS >= 8. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1340 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1341 scan += 2, match++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1342 Assert(*scan == *match, "match[2]?"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1343 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1344 /* We check for insufficient lookahead only every 8th comparison; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1345 * the 256th check will be made at strstart+258. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1346 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1347 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1348 } while (*++scan == *++match && *++scan == *++match && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1349 *++scan == *++match && *++scan == *++match && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1350 *++scan == *++match && *++scan == *++match && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1351 *++scan == *++match && *++scan == *++match && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1352 scan < strend); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1353 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1354 Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1355 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1356 len = MAX_MATCH - (int)(strend - scan); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1357 scan = strend - MAX_MATCH; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1358 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1359 #endif /* UNALIGNED_OK */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1360 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1361 if (len > best_len) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1362 s->match_start = cur_match; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1363 best_len = len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1364 if (len >= nice_match) break; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1365 #ifdef UNALIGNED_OK |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1366 scan_end = *(ushf*)(scan+best_len-1); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1367 #else |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1368 scan_end1 = scan[best_len-1]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1369 scan_end = scan[best_len]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1370 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1371 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1372 } while ((cur_match = prev[cur_match & wmask]) > limit |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1373 && --chain_length != 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1374 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1375 if ((uInt)best_len <= s->lookahead) return (uInt)best_len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1376 return s->lookahead; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1377 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1378 #endif /* ASMV */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1379 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1380 #else /* FASTEST */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1381 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1382 /* --------------------------------------------------------------------------- |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1383 * Optimized version for FASTEST only |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1384 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1385 local uInt longest_match(s, cur_match) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1386 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1387 IPos cur_match; /* current match */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1388 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1389 register Bytef *scan = s->window + s->strstart; /* current string */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1390 register Bytef *match; /* matched string */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1391 register int len; /* length of current match */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1392 register Bytef *strend = s->window + s->strstart + MAX_MATCH; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1393 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1394 /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1395 * It is easy to get rid of this optimization if necessary. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1396 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1397 Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1398 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1399 Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1400 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1401 Assert(cur_match < s->strstart, "no future"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1402 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1403 match = s->window + cur_match; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1404 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1405 /* Return failure if the match length is less than 2: |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1406 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1407 if (match[0] != scan[0] || match[1] != scan[1]) return MIN_MATCH-1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1408 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1409 /* The check at best_len-1 can be removed because it will be made |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1410 * again later. (This heuristic is not always a win.) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1411 * It is not necessary to compare scan[2] and match[2] since they |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1412 * are always equal when the other bytes match, given that |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1413 * the hash keys are equal and that HASH_BITS >= 8. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1414 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1415 scan += 2, match += 2; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1416 Assert(*scan == *match, "match[2]?"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1417 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1418 /* We check for insufficient lookahead only every 8th comparison; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1419 * the 256th check will be made at strstart+258. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1420 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1421 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1422 } while (*++scan == *++match && *++scan == *++match && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1423 *++scan == *++match && *++scan == *++match && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1424 *++scan == *++match && *++scan == *++match && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1425 *++scan == *++match && *++scan == *++match && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1426 scan < strend); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1427 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1428 Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1429 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1430 len = MAX_MATCH - (int)(strend - scan); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1431 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1432 if (len < MIN_MATCH) return MIN_MATCH - 1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1433 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1434 s->match_start = cur_match; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1435 return (uInt)len <= s->lookahead ? (uInt)len : s->lookahead; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1436 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1437 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1438 #endif /* FASTEST */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1439 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1440 #ifdef ZLIB_DEBUG |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1441 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1442 #define EQUAL 0 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1443 /* result of memcmp for equal strings */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1444 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1445 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1446 * Check that the match at match_start is indeed a match. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1447 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1448 local void check_match(s, start, match, length) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1449 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1450 IPos start, match; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1451 int length; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1452 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1453 /* check that the match is indeed a match */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1454 if (zmemcmp(s->window + match, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1455 s->window + start, length) != EQUAL) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1456 fprintf(stderr, " start %u, match %u, length %d\n", |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1457 start, match, length); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1458 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1459 fprintf(stderr, "%c%c", s->window[match++], s->window[start++]); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1460 } while (--length != 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1461 z_error("invalid match"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1462 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1463 if (z_verbose > 1) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1464 fprintf(stderr,"\\[%d,%d]", start-match, length); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1465 do { putc(s->window[start++], stderr); } while (--length != 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1466 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1467 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1468 #else |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1469 # define check_match(s, start, match, length) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1470 #endif /* ZLIB_DEBUG */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1471 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1472 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1473 * Fill the window when the lookahead becomes insufficient. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1474 * Updates strstart and lookahead. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1475 * |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1476 * IN assertion: lookahead < MIN_LOOKAHEAD |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1477 * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1478 * At least one byte has been read, or avail_in == 0; reads are |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1479 * performed for at least two bytes (required for the zip translate_eol |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1480 * option -- not supported here). |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1481 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1482 local void fill_window(s) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1483 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1484 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1485 unsigned n; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1486 unsigned more; /* Amount of free space at the end of the window. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1487 uInt wsize = s->w_size; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1488 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1489 Assert(s->lookahead < MIN_LOOKAHEAD, "already enough lookahead"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1490 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1491 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1492 more = (unsigned)(s->window_size -(ulg)s->lookahead -(ulg)s->strstart); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1493 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1494 /* Deal with !@#$% 64K limit: */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1495 if (sizeof(int) <= 2) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1496 if (more == 0 && s->strstart == 0 && s->lookahead == 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1497 more = wsize; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1498 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1499 } else if (more == (unsigned)(-1)) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1500 /* Very unlikely, but possible on 16 bit machine if |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1501 * strstart == 0 && lookahead == 1 (input done a byte at time) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1502 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1503 more--; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1504 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1505 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1506 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1507 /* If the window is almost full and there is insufficient lookahead, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1508 * move the upper half to the lower one to make room in the upper half. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1509 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1510 if (s->strstart >= wsize+MAX_DIST(s)) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1511 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1512 zmemcpy(s->window, s->window+wsize, (unsigned)wsize - more); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1513 s->match_start -= wsize; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1514 s->strstart -= wsize; /* we now have strstart >= MAX_DIST */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1515 s->block_start -= (long) wsize; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1516 slide_hash(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1517 more += wsize; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1518 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1519 if (s->strm->avail_in == 0) break; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1520 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1521 /* If there was no sliding: |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1522 * strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1523 * more == window_size - lookahead - strstart |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1524 * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1525 * => more >= window_size - 2*WSIZE + 2 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1526 * In the BIG_MEM or MMAP case (not yet supported), |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1527 * window_size == input_size + MIN_LOOKAHEAD && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1528 * strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1529 * Otherwise, window_size == 2*WSIZE so more >= 2. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1530 * If there was sliding, more >= WSIZE. So in all cases, more >= 2. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1531 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1532 Assert(more >= 2, "more < 2"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1533 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1534 n = read_buf(s->strm, s->window + s->strstart + s->lookahead, more); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1535 s->lookahead += n; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1536 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1537 /* Initialize the hash value now that we have some input: */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1538 if (s->lookahead + s->insert >= MIN_MATCH) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1539 uInt str = s->strstart - s->insert; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1540 s->ins_h = s->window[str]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1541 UPDATE_HASH(s, s->ins_h, s->window[str + 1]); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1542 #if MIN_MATCH != 3 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1543 Call UPDATE_HASH() MIN_MATCH-3 more times |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1544 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1545 while (s->insert) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1546 UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1547 #ifndef FASTEST |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1548 s->prev[str & s->w_mask] = s->head[s->ins_h]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1549 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1550 s->head[s->ins_h] = (Pos)str; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1551 str++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1552 s->insert--; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1553 if (s->lookahead + s->insert < MIN_MATCH) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1554 break; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1555 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1556 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1557 /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1558 * but this is not important since only literal bytes will be emitted. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1559 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1560 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1561 } while (s->lookahead < MIN_LOOKAHEAD && s->strm->avail_in != 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1562 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1563 /* If the WIN_INIT bytes after the end of the current data have never been |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1564 * written, then zero those bytes in order to avoid memory check reports of |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1565 * the use of uninitialized (or uninitialised as Julian writes) bytes by |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1566 * the longest match routines. Update the high water mark for the next |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1567 * time through here. WIN_INIT is set to MAX_MATCH since the longest match |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1568 * routines allow scanning to strstart + MAX_MATCH, ignoring lookahead. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1569 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1570 if (s->high_water < s->window_size) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1571 ulg curr = s->strstart + (ulg)(s->lookahead); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1572 ulg init; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1573 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1574 if (s->high_water < curr) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1575 /* Previous high water mark below current data -- zero WIN_INIT |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1576 * bytes or up to end of window, whichever is less. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1577 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1578 init = s->window_size - curr; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1579 if (init > WIN_INIT) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1580 init = WIN_INIT; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1581 zmemzero(s->window + curr, (unsigned)init); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1582 s->high_water = curr + init; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1583 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1584 else if (s->high_water < (ulg)curr + WIN_INIT) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1585 /* High water mark at or above current data, but below current data |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1586 * plus WIN_INIT -- zero out to current data plus WIN_INIT, or up |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1587 * to end of window, whichever is less. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1588 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1589 init = (ulg)curr + WIN_INIT - s->high_water; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1590 if (init > s->window_size - s->high_water) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1591 init = s->window_size - s->high_water; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1592 zmemzero(s->window + s->high_water, (unsigned)init); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1593 s->high_water += init; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1594 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1595 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1596 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1597 Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1598 "not enough room for search"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1599 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1600 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1601 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1602 * Flush the current block, with given end-of-file flag. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1603 * IN assertion: strstart is set to the end of the current match. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1604 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1605 #define FLUSH_BLOCK_ONLY(s, last) { \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1606 _tr_flush_block(s, (s->block_start >= 0L ? \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1607 (charf *)&s->window[(unsigned)s->block_start] : \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1608 (charf *)Z_NULL), \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1609 (ulg)((long)s->strstart - s->block_start), \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1610 (last)); \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1611 s->block_start = s->strstart; \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1612 flush_pending(s->strm); \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1613 Tracev((stderr,"[FLUSH]")); \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1614 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1615 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1616 /* Same but force premature exit if necessary. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1617 #define FLUSH_BLOCK(s, last) { \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1618 FLUSH_BLOCK_ONLY(s, last); \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1619 if (s->strm->avail_out == 0) return (last) ? finish_started : need_more; \ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1620 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1621 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1622 /* Maximum stored block length in deflate format (not including header). */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1623 #define MAX_STORED 65535 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1624 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1625 /* Minimum of a and b. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1626 #define MIN(a, b) ((a) > (b) ? (b) : (a)) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1627 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1628 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1629 * Copy without compression as much as possible from the input stream, return |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1630 * the current block state. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1631 * |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1632 * In case deflateParams() is used to later switch to a non-zero compression |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1633 * level, s->matches (otherwise unused when storing) keeps track of the number |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1634 * of hash table slides to perform. If s->matches is 1, then one hash table |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1635 * slide will be done when switching. If s->matches is 2, the maximum value |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1636 * allowed here, then the hash table will be cleared, since two or more slides |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1637 * is the same as a clear. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1638 * |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1639 * deflate_stored() is written to minimize the number of times an input byte is |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1640 * copied. It is most efficient with large input and output buffers, which |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1641 * maximizes the opportunites to have a single copy from next_in to next_out. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1642 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1643 local block_state deflate_stored(s, flush) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1644 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1645 int flush; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1646 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1647 /* Smallest worthy block size when not flushing or finishing. By default |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1648 * this is 32K. This can be as small as 507 bytes for memLevel == 1. For |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1649 * large input and output buffers, the stored block size will be larger. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1650 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1651 unsigned min_block = MIN(s->pending_buf_size - 5, s->w_size); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1652 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1653 /* Copy as many min_block or larger stored blocks directly to next_out as |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1654 * possible. If flushing, copy the remaining available input to next_out as |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1655 * stored blocks, if there is enough space. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1656 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1657 unsigned len, left, have, last = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1658 unsigned used = s->strm->avail_in; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1659 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1660 /* Set len to the maximum size block that we can copy directly with the |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1661 * available input data and output space. Set left to how much of that |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1662 * would be copied from what's left in the window. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1663 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1664 len = MAX_STORED; /* maximum deflate stored block length */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1665 have = (s->bi_valid + 42) >> 3; /* number of header bytes */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1666 if (s->strm->avail_out < have) /* need room for header */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1667 break; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1668 /* maximum stored block length that will fit in avail_out: */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1669 have = s->strm->avail_out - have; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1670 left = s->strstart - s->block_start; /* bytes left in window */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1671 if (len > (ulg)left + s->strm->avail_in) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1672 len = left + s->strm->avail_in; /* limit len to the input */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1673 if (len > have) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1674 len = have; /* limit len to the output */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1675 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1676 /* If the stored block would be less than min_block in length, or if |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1677 * unable to copy all of the available input when flushing, then try |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1678 * copying to the window and the pending buffer instead. Also don't |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1679 * write an empty block when flushing -- deflate() does that. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1680 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1681 if (len < min_block && ((len == 0 && flush != Z_FINISH) || |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1682 flush == Z_NO_FLUSH || |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1683 len != left + s->strm->avail_in)) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1684 break; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1685 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1686 /* Make a dummy stored block in pending to get the header bytes, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1687 * including any pending bits. This also updates the debugging counts. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1688 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1689 last = flush == Z_FINISH && len == left + s->strm->avail_in ? 1 : 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1690 _tr_stored_block(s, (char *)0, 0L, last); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1691 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1692 /* Replace the lengths in the dummy stored block with len. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1693 s->pending_buf[s->pending - 4] = len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1694 s->pending_buf[s->pending - 3] = len >> 8; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1695 s->pending_buf[s->pending - 2] = ~len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1696 s->pending_buf[s->pending - 1] = ~len >> 8; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1697 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1698 /* Write the stored block header bytes. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1699 flush_pending(s->strm); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1700 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1701 #ifdef ZLIB_DEBUG |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1702 /* Update debugging counts for the data about to be copied. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1703 s->compressed_len += len << 3; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1704 s->bits_sent += len << 3; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1705 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1706 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1707 /* Copy uncompressed bytes from the window to next_out. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1708 if (left) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1709 if (left > len) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1710 left = len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1711 zmemcpy(s->strm->next_out, s->window + s->block_start, left); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1712 s->strm->next_out += left; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1713 s->strm->avail_out -= left; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1714 s->strm->total_out += left; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1715 s->block_start += left; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1716 len -= left; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1717 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1718 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1719 /* Copy uncompressed bytes directly from next_in to next_out, updating |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1720 * the check value. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1721 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1722 if (len) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1723 read_buf(s->strm, s->strm->next_out, len); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1724 s->strm->next_out += len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1725 s->strm->avail_out -= len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1726 s->strm->total_out += len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1727 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1728 } while (last == 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1729 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1730 /* Update the sliding window with the last s->w_size bytes of the copied |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1731 * data, or append all of the copied data to the existing window if less |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1732 * than s->w_size bytes were copied. Also update the number of bytes to |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1733 * insert in the hash tables, in the event that deflateParams() switches to |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1734 * a non-zero compression level. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1735 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1736 used -= s->strm->avail_in; /* number of input bytes directly copied */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1737 if (used) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1738 /* If any input was used, then no unused input remains in the window, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1739 * therefore s->block_start == s->strstart. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1740 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1741 if (used >= s->w_size) { /* supplant the previous history */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1742 s->matches = 2; /* clear hash */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1743 zmemcpy(s->window, s->strm->next_in - s->w_size, s->w_size); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1744 s->strstart = s->w_size; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1745 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1746 else { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1747 if (s->window_size - s->strstart <= used) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1748 /* Slide the window down. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1749 s->strstart -= s->w_size; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1750 zmemcpy(s->window, s->window + s->w_size, s->strstart); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1751 if (s->matches < 2) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1752 s->matches++; /* add a pending slide_hash() */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1753 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1754 zmemcpy(s->window + s->strstart, s->strm->next_in - used, used); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1755 s->strstart += used; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1756 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1757 s->block_start = s->strstart; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1758 s->insert += MIN(used, s->w_size - s->insert); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1759 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1760 if (s->high_water < s->strstart) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1761 s->high_water = s->strstart; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1762 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1763 /* If the last block was written to next_out, then done. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1764 if (last) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1765 return finish_done; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1766 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1767 /* If flushing and all input has been consumed, then done. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1768 if (flush != Z_NO_FLUSH && flush != Z_FINISH && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1769 s->strm->avail_in == 0 && (long)s->strstart == s->block_start) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1770 return block_done; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1771 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1772 /* Fill the window with any remaining input. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1773 have = s->window_size - s->strstart - 1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1774 if (s->strm->avail_in > have && s->block_start >= (long)s->w_size) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1775 /* Slide the window down. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1776 s->block_start -= s->w_size; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1777 s->strstart -= s->w_size; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1778 zmemcpy(s->window, s->window + s->w_size, s->strstart); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1779 if (s->matches < 2) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1780 s->matches++; /* add a pending slide_hash() */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1781 have += s->w_size; /* more space now */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1782 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1783 if (have > s->strm->avail_in) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1784 have = s->strm->avail_in; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1785 if (have) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1786 read_buf(s->strm, s->window + s->strstart, have); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1787 s->strstart += have; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1788 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1789 if (s->high_water < s->strstart) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1790 s->high_water = s->strstart; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1791 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1792 /* There was not enough avail_out to write a complete worthy or flushed |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1793 * stored block to next_out. Write a stored block to pending instead, if we |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1794 * have enough input for a worthy block, or if flushing and there is enough |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1795 * room for the remaining input as a stored block in the pending buffer. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1796 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1797 have = (s->bi_valid + 42) >> 3; /* number of header bytes */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1798 /* maximum stored block length that will fit in pending: */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1799 have = MIN(s->pending_buf_size - have, MAX_STORED); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1800 min_block = MIN(have, s->w_size); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1801 left = s->strstart - s->block_start; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1802 if (left >= min_block || |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1803 ((left || flush == Z_FINISH) && flush != Z_NO_FLUSH && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1804 s->strm->avail_in == 0 && left <= have)) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1805 len = MIN(left, have); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1806 last = flush == Z_FINISH && s->strm->avail_in == 0 && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1807 len == left ? 1 : 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1808 _tr_stored_block(s, (charf *)s->window + s->block_start, len, last); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1809 s->block_start += len; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1810 flush_pending(s->strm); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1811 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1812 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1813 /* We've done all we can with the available input and output. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1814 return last ? finish_started : need_more; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1815 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1816 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1817 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1818 * Compress as much as possible from the input stream, return the current |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1819 * block state. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1820 * This function does not perform lazy evaluation of matches and inserts |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1821 * new strings in the dictionary only for unmatched strings or for short |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1822 * matches. It is used only for the fast compression options. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1823 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1824 local block_state deflate_fast(s, flush) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1825 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1826 int flush; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1827 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1828 IPos hash_head; /* head of the hash chain */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1829 int bflush; /* set if current block must be flushed */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1830 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1831 for (;;) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1832 /* Make sure that we always have enough lookahead, except |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1833 * at the end of the input file. We need MAX_MATCH bytes |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1834 * for the next match, plus MIN_MATCH bytes to insert the |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1835 * string following the next match. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1836 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1837 if (s->lookahead < MIN_LOOKAHEAD) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1838 fill_window(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1839 if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1840 return need_more; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1841 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1842 if (s->lookahead == 0) break; /* flush the current block */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1843 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1844 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1845 /* Insert the string window[strstart .. strstart+2] in the |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1846 * dictionary, and set hash_head to the head of the hash chain: |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1847 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1848 hash_head = NIL; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1849 if (s->lookahead >= MIN_MATCH) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1850 INSERT_STRING(s, s->strstart, hash_head); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1851 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1852 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1853 /* Find the longest match, discarding those <= prev_length. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1854 * At this point we have always match_length < MIN_MATCH |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1855 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1856 if (hash_head != NIL && s->strstart - hash_head <= MAX_DIST(s)) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1857 /* To simplify the code, we prevent matches with the string |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1858 * of window index 0 (in particular we have to avoid a match |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1859 * of the string with itself at the start of the input file). |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1860 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1861 s->match_length = longest_match (s, hash_head); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1862 /* longest_match() sets match_start */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1863 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1864 if (s->match_length >= MIN_MATCH) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1865 check_match(s, s->strstart, s->match_start, s->match_length); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1866 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1867 _tr_tally_dist(s, s->strstart - s->match_start, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1868 s->match_length - MIN_MATCH, bflush); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1869 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1870 s->lookahead -= s->match_length; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1871 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1872 /* Insert new strings in the hash table only if the match length |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1873 * is not too large. This saves time but degrades compression. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1874 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1875 #ifndef FASTEST |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1876 if (s->match_length <= s->max_insert_length && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1877 s->lookahead >= MIN_MATCH) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1878 s->match_length--; /* string at strstart already in table */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1879 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1880 s->strstart++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1881 INSERT_STRING(s, s->strstart, hash_head); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1882 /* strstart never exceeds WSIZE-MAX_MATCH, so there are |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1883 * always MIN_MATCH bytes ahead. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1884 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1885 } while (--s->match_length != 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1886 s->strstart++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1887 } else |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1888 #endif |
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Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1889 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1890 s->strstart += s->match_length; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1891 s->match_length = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1892 s->ins_h = s->window[s->strstart]; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1893 UPDATE_HASH(s, s->ins_h, s->window[s->strstart+1]); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1894 #if MIN_MATCH != 3 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1895 Call UPDATE_HASH() MIN_MATCH-3 more times |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1896 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1897 /* If lookahead < MIN_MATCH, ins_h is garbage, but it does not |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1898 * matter since it will be recomputed at next deflate call. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1899 */ |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1900 } |
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Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1901 } else { |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1902 /* No match, output a literal byte */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1903 Tracevv((stderr,"%c", s->window[s->strstart])); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1904 _tr_tally_lit (s, s->window[s->strstart], bflush); |
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Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1905 s->lookahead--; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1906 s->strstart++; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1907 } |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1908 if (bflush) FLUSH_BLOCK(s, 0); |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1909 } |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1910 s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1; |
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parents:
diff
changeset
|
1911 if (flush == Z_FINISH) { |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
1912 FLUSH_BLOCK(s, 1); |
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parents:
diff
changeset
|
1913 return finish_done; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1914 } |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1915 if (s->last_lit) |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1916 FLUSH_BLOCK(s, 0); |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1917 return block_done; |
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parents:
diff
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|
1918 } |
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parents:
diff
changeset
|
1919 |
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parents:
diff
changeset
|
1920 #ifndef FASTEST |
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parents:
diff
changeset
|
1921 /* =========================================================================== |
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parents:
diff
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|
1922 * Same as above, but achieves better compression. We use a lazy |
00d788dac91a
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parents:
diff
changeset
|
1923 * evaluation for matches: a match is finally adopted only if there is |
00d788dac91a
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parents:
diff
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|
1924 * no better match at the next window position. |
00d788dac91a
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parents:
diff
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|
1925 */ |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1926 local block_state deflate_slow(s, flush) |
00d788dac91a
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parents:
diff
changeset
|
1927 deflate_state *s; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1928 int flush; |
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parents:
diff
changeset
|
1929 { |
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parents:
diff
changeset
|
1930 IPos hash_head; /* head of hash chain */ |
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parents:
diff
changeset
|
1931 int bflush; /* set if current block must be flushed */ |
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parents:
diff
changeset
|
1932 |
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parents:
diff
changeset
|
1933 /* Process the input block. */ |
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parents:
diff
changeset
|
1934 for (;;) { |
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parents:
diff
changeset
|
1935 /* Make sure that we always have enough lookahead, except |
00d788dac91a
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parents:
diff
changeset
|
1936 * at the end of the input file. We need MAX_MATCH bytes |
00d788dac91a
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parents:
diff
changeset
|
1937 * for the next match, plus MIN_MATCH bytes to insert the |
00d788dac91a
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parents:
diff
changeset
|
1938 * string following the next match. |
00d788dac91a
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parents:
diff
changeset
|
1939 */ |
00d788dac91a
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parents:
diff
changeset
|
1940 if (s->lookahead < MIN_LOOKAHEAD) { |
00d788dac91a
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parents:
diff
changeset
|
1941 fill_window(s); |
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parents:
diff
changeset
|
1942 if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) { |
00d788dac91a
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parents:
diff
changeset
|
1943 return need_more; |
00d788dac91a
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parents:
diff
changeset
|
1944 } |
00d788dac91a
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parents:
diff
changeset
|
1945 if (s->lookahead == 0) break; /* flush the current block */ |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
1946 } |
00d788dac91a
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parents:
diff
changeset
|
1947 |
00d788dac91a
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parents:
diff
changeset
|
1948 /* Insert the string window[strstart .. strstart+2] in the |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1949 * dictionary, and set hash_head to the head of the hash chain: |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
1950 */ |
00d788dac91a
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parents:
diff
changeset
|
1951 hash_head = NIL; |
00d788dac91a
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parents:
diff
changeset
|
1952 if (s->lookahead >= MIN_MATCH) { |
00d788dac91a
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parents:
diff
changeset
|
1953 INSERT_STRING(s, s->strstart, hash_head); |
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Added support for reading gzipped ROMs
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parents:
diff
changeset
|
1954 } |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
1955 |
00d788dac91a
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parents:
diff
changeset
|
1956 /* Find the longest match, discarding those <= prev_length. |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
1957 */ |
00d788dac91a
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parents:
diff
changeset
|
1958 s->prev_length = s->match_length, s->prev_match = s->match_start; |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
1959 s->match_length = MIN_MATCH-1; |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
1960 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1961 if (hash_head != NIL && s->prev_length < s->max_lazy_match && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1962 s->strstart - hash_head <= MAX_DIST(s)) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1963 /* To simplify the code, we prevent matches with the string |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1964 * of window index 0 (in particular we have to avoid a match |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1965 * of the string with itself at the start of the input file). |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1966 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1967 s->match_length = longest_match (s, hash_head); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1968 /* longest_match() sets match_start */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1969 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1970 if (s->match_length <= 5 && (s->strategy == Z_FILTERED |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1971 #if TOO_FAR <= 32767 |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
diff
changeset
|
1972 || (s->match_length == MIN_MATCH && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1973 s->strstart - s->match_start > TOO_FAR) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1974 #endif |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1975 )) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1976 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1977 /* If prev_match is also MIN_MATCH, match_start is garbage |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1978 * but we will ignore the current match anyway. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1979 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1980 s->match_length = MIN_MATCH-1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1981 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1982 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1983 /* If there was a match at the previous step and the current |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1984 * match is not better, output the previous match: |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1985 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1986 if (s->prev_length >= MIN_MATCH && s->match_length <= s->prev_length) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1987 uInt max_insert = s->strstart + s->lookahead - MIN_MATCH; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1988 /* Do not insert strings in hash table beyond this. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1989 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1990 check_match(s, s->strstart-1, s->prev_match, s->prev_length); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1991 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1992 _tr_tally_dist(s, s->strstart -1 - s->prev_match, |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1993 s->prev_length - MIN_MATCH, bflush); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1994 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1995 /* Insert in hash table all strings up to the end of the match. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1996 * strstart-1 and strstart are already inserted. If there is not |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1997 * enough lookahead, the last two strings are not inserted in |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1998 * the hash table. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1999 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2000 s->lookahead -= s->prev_length-1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2001 s->prev_length -= 2; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2002 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2003 if (++s->strstart <= max_insert) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2004 INSERT_STRING(s, s->strstart, hash_head); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2005 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2006 } while (--s->prev_length != 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2007 s->match_available = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2008 s->match_length = MIN_MATCH-1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2009 s->strstart++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2010 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2011 if (bflush) FLUSH_BLOCK(s, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2012 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2013 } else if (s->match_available) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2014 /* If there was no match at the previous position, output a |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2015 * single literal. If there was a match but the current match |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2016 * is longer, truncate the previous match to a single literal. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2017 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2018 Tracevv((stderr,"%c", s->window[s->strstart-1])); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2019 _tr_tally_lit(s, s->window[s->strstart-1], bflush); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2020 if (bflush) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2021 FLUSH_BLOCK_ONLY(s, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2022 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2023 s->strstart++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2024 s->lookahead--; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2025 if (s->strm->avail_out == 0) return need_more; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2026 } else { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2027 /* There is no previous match to compare with, wait for |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2028 * the next step to decide. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2029 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2030 s->match_available = 1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2031 s->strstart++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2032 s->lookahead--; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2033 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2034 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2035 Assert (flush != Z_NO_FLUSH, "no flush?"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2036 if (s->match_available) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2037 Tracevv((stderr,"%c", s->window[s->strstart-1])); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2038 _tr_tally_lit(s, s->window[s->strstart-1], bflush); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2039 s->match_available = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2040 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2041 s->insert = s->strstart < MIN_MATCH-1 ? s->strstart : MIN_MATCH-1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2042 if (flush == Z_FINISH) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2043 FLUSH_BLOCK(s, 1); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2044 return finish_done; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2045 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2046 if (s->last_lit) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2047 FLUSH_BLOCK(s, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2048 return block_done; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2049 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2050 #endif /* FASTEST */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2051 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2052 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2053 * For Z_RLE, simply look for runs of bytes, generate matches only of distance |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2054 * one. Do not maintain a hash table. (It will be regenerated if this run of |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2055 * deflate switches away from Z_RLE.) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2056 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2057 local block_state deflate_rle(s, flush) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2058 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2059 int flush; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2060 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2061 int bflush; /* set if current block must be flushed */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2062 uInt prev; /* byte at distance one to match */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2063 Bytef *scan, *strend; /* scan goes up to strend for length of run */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2064 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2065 for (;;) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2066 /* Make sure that we always have enough lookahead, except |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2067 * at the end of the input file. We need MAX_MATCH bytes |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2068 * for the longest run, plus one for the unrolled loop. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2069 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2070 if (s->lookahead <= MAX_MATCH) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2071 fill_window(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2072 if (s->lookahead <= MAX_MATCH && flush == Z_NO_FLUSH) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2073 return need_more; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2074 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2075 if (s->lookahead == 0) break; /* flush the current block */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2076 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2077 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2078 /* See how many times the previous byte repeats */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2079 s->match_length = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2080 if (s->lookahead >= MIN_MATCH && s->strstart > 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2081 scan = s->window + s->strstart - 1; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2082 prev = *scan; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2083 if (prev == *++scan && prev == *++scan && prev == *++scan) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2084 strend = s->window + s->strstart + MAX_MATCH; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2085 do { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2086 } while (prev == *++scan && prev == *++scan && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2087 prev == *++scan && prev == *++scan && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2088 prev == *++scan && prev == *++scan && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2089 prev == *++scan && prev == *++scan && |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2090 scan < strend); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2091 s->match_length = MAX_MATCH - (uInt)(strend - scan); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2092 if (s->match_length > s->lookahead) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2093 s->match_length = s->lookahead; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2094 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2095 Assert(scan <= s->window+(uInt)(s->window_size-1), "wild scan"); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2096 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2097 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2098 /* Emit match if have run of MIN_MATCH or longer, else emit literal */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2099 if (s->match_length >= MIN_MATCH) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2100 check_match(s, s->strstart, s->strstart - 1, s->match_length); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2101 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2102 _tr_tally_dist(s, 1, s->match_length - MIN_MATCH, bflush); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2103 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2104 s->lookahead -= s->match_length; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2105 s->strstart += s->match_length; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2106 s->match_length = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2107 } else { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2108 /* No match, output a literal byte */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2109 Tracevv((stderr,"%c", s->window[s->strstart])); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2110 _tr_tally_lit (s, s->window[s->strstart], bflush); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2111 s->lookahead--; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2112 s->strstart++; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2113 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2114 if (bflush) FLUSH_BLOCK(s, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2115 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2116 s->insert = 0; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2117 if (flush == Z_FINISH) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2118 FLUSH_BLOCK(s, 1); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2119 return finish_done; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2120 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2121 if (s->last_lit) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2122 FLUSH_BLOCK(s, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2123 return block_done; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2124 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2125 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2126 /* =========================================================================== |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2127 * For Z_HUFFMAN_ONLY, do not look for matches. Do not maintain a hash table. |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2128 * (It will be regenerated if this run of deflate switches away from Huffman.) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2129 */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2130 local block_state deflate_huff(s, flush) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2131 deflate_state *s; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2132 int flush; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2133 { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2134 int bflush; /* set if current block must be flushed */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2135 |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2136 for (;;) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2137 /* Make sure that we have a literal to write. */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2138 if (s->lookahead == 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2139 fill_window(s); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2140 if (s->lookahead == 0) { |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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2141 if (flush == Z_NO_FLUSH) |
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Added support for reading gzipped ROMs
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parents:
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2142 return need_more; |
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Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
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2143 break; /* flush the current block */ |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
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2144 } |
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Michael Pavone <pavone@retrodev.com>
parents:
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2145 } |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
2146 |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2147 /* Output a literal byte */ |
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Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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2148 s->match_length = 0; |
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parents:
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2149 Tracevv((stderr,"%c", s->window[s->strstart])); |
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Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
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2150 _tr_tally_lit (s, s->window[s->strstart], bflush); |
00d788dac91a
Added support for reading gzipped ROMs
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parents:
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2151 s->lookahead--; |
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Added support for reading gzipped ROMs
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|
2152 s->strstart++; |
00d788dac91a
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parents:
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2153 if (bflush) FLUSH_BLOCK(s, 0); |
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parents:
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|
2154 } |
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Michael Pavone <pavone@retrodev.com>
parents:
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|
2155 s->insert = 0; |
00d788dac91a
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Michael Pavone <pavone@retrodev.com>
parents:
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changeset
|
2156 if (flush == Z_FINISH) { |
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Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2157 FLUSH_BLOCK(s, 1); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
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2158 return finish_done; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
2159 } |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2160 if (s->last_lit) |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
2161 FLUSH_BLOCK(s, 0); |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
2162 return block_done; |
00d788dac91a
Added support for reading gzipped ROMs
Michael Pavone <pavone@retrodev.com>
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2163 } |