Mercurial > repos > blastem
annotate serialize.c @ 2055:c4d066d798c4 segacd
Fix prog RAM banking and Genesis to SCD cycle conversion. Arkagis Escape demo now works
author | Michael Pavone <pavone@retrodev.com> |
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date | Tue, 18 Jan 2022 23:54:02 -0800 |
parents | c3c62dbf1ceb |
children |
rev | line source |
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1 #include <string.h> |
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2 #include <stdlib.h> |
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3 #include <stdio.h> |
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4 #include "serialize.h" |
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5 #include "util.h" |
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6 |
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7 #ifndef SERIALIZE_DEFAULT_SIZE |
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8 #define SERIALIZE_DEFAULT_SIZE (256*1024) //default to enough for a Genesis save state |
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9 #endif |
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10 |
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11 |
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12 void init_serialize(serialize_buffer *buf) |
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13 { |
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14 buf->storage = SERIALIZE_DEFAULT_SIZE; |
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15 buf->size = 0; |
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16 buf->current_section_start = 0; |
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17 buf->data = malloc(SERIALIZE_DEFAULT_SIZE); |
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18 } |
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19 |
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20 static void reserve(serialize_buffer *buf, size_t amount) |
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21 { |
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22 if (amount > (buf->storage - buf->size)) { |
1946 | 23 if (amount < buf->storage) { |
24 buf->storage *= 2; | |
25 } else { | |
26 //doublign isn't enough, increase by the precise amount needed | |
27 buf->storage += amount - (buf->storage - buf->size); | |
28 } | |
29 buf->data = realloc(buf->data, buf->storage + sizeof(*buf)); | |
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30 } |
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31 } |
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32 |
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33 void save_int32(serialize_buffer *buf, uint32_t val) |
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34 { |
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35 reserve(buf, sizeof(val)); |
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36 buf->data[buf->size++] = val >> 24; |
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37 buf->data[buf->size++] = val >> 16; |
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38 buf->data[buf->size++] = val >> 8; |
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39 buf->data[buf->size++] = val; |
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40 } |
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41 |
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42 void save_int16(serialize_buffer *buf, uint16_t val) |
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43 { |
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44 reserve(buf, sizeof(val)); |
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45 buf->data[buf->size++] = val >> 8; |
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46 buf->data[buf->size++] = val; |
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47 } |
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48 |
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49 void save_int8(serialize_buffer *buf, uint8_t val) |
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50 { |
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51 reserve(buf, sizeof(val)); |
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52 buf->data[buf->size++] = val; |
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53 } |
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54 |
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55 void save_string(serialize_buffer *buf, char *val) |
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56 { |
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57 size_t len = strlen(val); |
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58 save_buffer8(buf, val, len); |
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59 } |
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60 |
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61 void save_buffer8(serialize_buffer *buf, void *val, size_t len) |
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62 { |
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63 reserve(buf, len); |
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64 memcpy(&buf->data[buf->size], val, len); |
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65 buf->size += len; |
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66 } |
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67 |
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68 void save_buffer16(serialize_buffer *buf, uint16_t *val, size_t len) |
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69 { |
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70 reserve(buf, len * sizeof(*val)); |
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71 for(; len != 0; len--, val++) { |
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72 buf->data[buf->size++] = *val >> 8; |
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73 buf->data[buf->size++] = *val; |
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74 } |
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75 } |
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76 |
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77 void save_buffer32(serialize_buffer *buf, uint32_t *val, size_t len) |
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78 { |
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79 reserve(buf, len * sizeof(*val)); |
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80 for(; len != 0; len--, val++) { |
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81 buf->data[buf->size++] = *val >> 24; |
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82 buf->data[buf->size++] = *val >> 16; |
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83 buf->data[buf->size++] = *val >> 8; |
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84 buf->data[buf->size++] = *val; |
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85 } |
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86 } |
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87 |
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88 void start_section(serialize_buffer *buf, uint16_t section_id) |
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89 { |
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90 save_int16(buf, section_id); |
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91 //reserve some space for size once we end this section |
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92 reserve(buf, sizeof(uint32_t)); |
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93 buf->size += sizeof(uint32_t); |
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94 //save start point for use in end_device |
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95 buf->current_section_start = buf->size; |
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96 } |
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97 |
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98 void end_section(serialize_buffer *buf) |
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99 { |
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100 size_t section_size = buf->size - buf->current_section_start; |
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101 if (section_size > 0xFFFFFFFFU) { |
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102 fatal_error("Sections larger than 4GB are not supported"); |
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103 } |
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104 uint32_t size = section_size; |
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105 uint8_t *field = buf->data + buf->current_section_start - sizeof(uint32_t); |
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106 *(field++) = size >> 24; |
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107 *(field++) = size >> 16; |
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108 *(field++) = size >> 8; |
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109 *(field++) = size; |
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110 buf->current_section_start = 0; |
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111 } |
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112 |
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113 void register_section_handler(deserialize_buffer *buf, section_handler handler, uint16_t section_id) |
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114 { |
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115 if (section_id > buf->max_handler) { |
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116 uint16_t old_max = buf->max_handler; |
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117 if (buf->max_handler < 0x8000) { |
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118 buf->max_handler *= 2; |
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119 } else { |
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120 buf->max_handler = 0xFFFF; |
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121 } |
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122 buf->handlers = realloc(buf->handlers, (buf->max_handler+1) * sizeof(handler)); |
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123 memset(buf->handlers + old_max + 1, 0, (buf->max_handler - old_max) * sizeof(handler)); |
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124 } |
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125 if (!buf->handlers) { |
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126 buf->handlers = calloc(buf->max_handler + 1, sizeof(handler)); |
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127 } |
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128 buf->handlers[section_id] = handler; |
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129 } |
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130 |
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131 void init_deserialize(deserialize_buffer *buf, uint8_t *data, size_t size) |
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132 { |
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133 buf->size = size; |
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134 buf->cur_pos = 0; |
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135 buf->data = data; |
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136 buf->handlers = NULL; |
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137 buf->max_handler = 8; |
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138 } |
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139 |
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140 uint32_t load_int32(deserialize_buffer *buf) |
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141 { |
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142 uint32_t val; |
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143 if ((buf->size - buf->cur_pos) < sizeof(val)) { |
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144 fatal_error("Failed to load required int32 field"); |
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145 } |
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146 val = buf->data[buf->cur_pos++] << 24; |
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147 val |= buf->data[buf->cur_pos++] << 16; |
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148 val |= buf->data[buf->cur_pos++] << 8; |
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149 val |= buf->data[buf->cur_pos++]; |
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150 return val; |
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151 } |
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152 |
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153 uint16_t load_int16(deserialize_buffer *buf) |
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154 { |
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155 uint16_t val; |
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156 if ((buf->size - buf->cur_pos) < sizeof(val)) { |
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157 fatal_error("Failed to load required int16 field"); |
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158 } |
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159 val = buf->data[buf->cur_pos++] << 8; |
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160 val |= buf->data[buf->cur_pos++]; |
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161 return val; |
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162 } |
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163 |
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164 uint8_t load_int8(deserialize_buffer *buf) |
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165 { |
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166 uint8_t val; |
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167 if ((buf->size - buf->cur_pos) < sizeof(val)) { |
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168 fatal_error("Failed to load required int8 field"); |
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169 } |
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170 val = buf->data[buf->cur_pos++]; |
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171 return val; |
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172 } |
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173 |
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|
174 void load_buffer8(deserialize_buffer *buf, void *dst, size_t len) |
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175 { |
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176 if ((buf->size - buf->cur_pos) < len) { |
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177 fatal_error("Failed to load required buffer of size %d", len); |
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178 } |
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179 memcpy(dst, buf->data + buf->cur_pos, len); |
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180 buf->cur_pos += len; |
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|
181 } |
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|
182 |
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|
183 void load_buffer16(deserialize_buffer *buf, uint16_t *dst, size_t len) |
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184 { |
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|
185 if ((buf->size - buf->cur_pos) < len * sizeof(uint16_t)) { |
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186 fatal_error("Failed to load required buffer of size %d\n", len); |
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|
187 } |
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|
188 for(; len != 0; len--, dst++) { |
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|
189 uint16_t value = buf->data[buf->cur_pos++] << 8; |
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|
190 value |= buf->data[buf->cur_pos++]; |
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|
191 *dst = value; |
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|
192 } |
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|
193 } |
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|
194 void load_buffer32(deserialize_buffer *buf, uint32_t *dst, size_t len) |
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|
195 { |
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|
196 if ((buf->size - buf->cur_pos) < len * sizeof(uint32_t)) { |
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|
197 fatal_error("Failed to load required buffer of size %d\n", len); |
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|
198 } |
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|
199 for(; len != 0; len--, dst++) { |
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|
200 uint32_t value = buf->data[buf->cur_pos++] << 24; |
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|
201 value |= buf->data[buf->cur_pos++] << 16; |
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|
202 value |= buf->data[buf->cur_pos++] << 8; |
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|
203 value |= buf->data[buf->cur_pos++]; |
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|
204 *dst = value; |
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|
205 } |
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parents:
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|
206 } |
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|
207 |
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|
208 void load_section(deserialize_buffer *buf) |
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|
209 { |
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parents:
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|
210 if (!buf->handlers) { |
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|
211 fatal_error("load_section called on a deserialize_buffer with no handlers registered\n"); |
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|
212 } |
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|
213 uint16_t section_id = load_int16(buf); |
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|
214 uint32_t size = load_int32(buf); |
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|
215 if (size > (buf->size - buf->cur_pos)) { |
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|
216 fatal_error("Section is bigger than remaining space in file"); |
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parents:
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|
217 } |
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parents:
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changeset
|
218 if (section_id > buf->max_handler || !buf->handlers[section_id].fun) { |
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parents:
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|
219 warning("No handler for section ID %d, save state may be from a newer version\n", section_id); |
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|
220 buf->cur_pos += size; |
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parents:
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|
221 return; |
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parents:
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|
222 } |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
223 deserialize_buffer section; |
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parents:
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|
224 init_deserialize(§ion, buf->data + buf->cur_pos, size); |
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|
225 buf->handlers[section_id].fun(§ion, buf->handlers[section_id].data); |
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|
226 buf->cur_pos += size; |
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parents:
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|
227 } |
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|
228 |
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|
229 static const char sz_ident[] = "BLSTSZ\x01\x07"; |
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|
230 |
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parents:
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|
231 uint8_t save_to_file(serialize_buffer *buf, char *path) |
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|
232 { |
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|
233 FILE *f = fopen(path, "wb"); |
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|
234 if (!f) { |
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parents:
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|
235 return 0; |
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Michael Pavone <pavone@retrodev.com>
parents:
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|
236 } |
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Michael Pavone <pavone@retrodev.com>
parents:
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|
237 if (fwrite(sz_ident, 1, sizeof(sz_ident)-1, f) != sizeof(sz_ident)-1) { |
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parents:
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|
238 fclose(f); |
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Michael Pavone <pavone@retrodev.com>
parents:
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|
239 return 0; |
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parents:
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|
240 } |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
241 if (fwrite(buf->data, 1, buf->size, f) != buf->size) { |
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parents:
diff
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|
242 fclose(f); |
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Michael Pavone <pavone@retrodev.com>
parents:
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changeset
|
243 return 0; |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
244 } |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
245 fclose(f); |
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Michael Pavone <pavone@retrodev.com>
parents:
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|
246 return 1; |
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parents:
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|
247 } |
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parents:
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|
248 |
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|
249 uint8_t load_from_file(deserialize_buffer *buf, char *path) |
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|
250 { |
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Michael Pavone <pavone@retrodev.com>
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|
251 FILE *f = fopen(path, "rb"); |
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|
252 if (!f) { |
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parents:
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|
253 return 0; |
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parents:
diff
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|
254 } |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
255 char ident[sizeof(sz_ident)-1]; |
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parents:
diff
changeset
|
256 long size = file_size(f); |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
257 if (size < sizeof(ident)) { |
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parents:
diff
changeset
|
258 fclose(f); |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
259 return 0; |
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parents:
diff
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|
260 } |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
261 if (fread(ident, 1, sizeof(ident), f) != sizeof(ident)) { |
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parents:
diff
changeset
|
262 fclose(f); |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
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|
263 return 0; |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
264 } |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
265 if (memcmp(ident, sz_ident, sizeof(ident))) { |
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266 return 0; |
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267 } |
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268 buf->size = size - sizeof(ident); |
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269 buf->cur_pos = 0; |
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270 buf->data = malloc(buf->size); |
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271 buf->handlers = NULL; |
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272 buf->max_handler = 8; |
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273 if (fread(buf->data, 1, buf->size, f) != buf->size) { |
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274 fclose(f); |
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275 free(buf->data); |
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276 buf->data = NULL; |
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277 buf->size = 0; |
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278 return 0; |
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279 } |
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280 fclose(f); |
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281 return 1; |
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282 } |