Mercurial > repos > blastem
comparison zlib/gzguts.h @ 1530:00d788dac91a
Added support for reading gzipped ROMs
author | Michael Pavone <pavone@retrodev.com> |
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date | Fri, 23 Mar 2018 22:30:02 -0700 |
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1529:f7fe240a7da6 | 1530:00d788dac91a |
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1 /* gzguts.h -- zlib internal header definitions for gz* operations | |
2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler | |
3 * For conditions of distribution and use, see copyright notice in zlib.h | |
4 */ | |
5 | |
6 #ifdef _LARGEFILE64_SOURCE | |
7 # ifndef _LARGEFILE_SOURCE | |
8 # define _LARGEFILE_SOURCE 1 | |
9 # endif | |
10 # ifdef _FILE_OFFSET_BITS | |
11 # undef _FILE_OFFSET_BITS | |
12 # endif | |
13 #endif | |
14 | |
15 #ifdef HAVE_HIDDEN | |
16 # define ZLIB_INTERNAL __attribute__((visibility ("hidden"))) | |
17 #else | |
18 # define ZLIB_INTERNAL | |
19 #endif | |
20 | |
21 #include <stdio.h> | |
22 #include "zlib.h" | |
23 #ifdef STDC | |
24 # include <string.h> | |
25 # include <stdlib.h> | |
26 # include <limits.h> | |
27 #endif | |
28 | |
29 #ifndef _POSIX_SOURCE | |
30 # define _POSIX_SOURCE | |
31 #endif | |
32 #include <fcntl.h> | |
33 | |
34 #ifdef _WIN32 | |
35 # include <stddef.h> | |
36 #endif | |
37 | |
38 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) | |
39 # include <io.h> | |
40 #endif | |
41 | |
42 #if defined(_WIN32) || defined(__CYGWIN__) | |
43 # define WIDECHAR | |
44 #endif | |
45 | |
46 #ifdef WINAPI_FAMILY | |
47 # define open _open | |
48 # define read _read | |
49 # define write _write | |
50 # define close _close | |
51 #endif | |
52 | |
53 #ifdef NO_DEFLATE /* for compatibility with old definition */ | |
54 # define NO_GZCOMPRESS | |
55 #endif | |
56 | |
57 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) | |
58 # ifndef HAVE_VSNPRINTF | |
59 # define HAVE_VSNPRINTF | |
60 # endif | |
61 #endif | |
62 | |
63 #if defined(__CYGWIN__) | |
64 # ifndef HAVE_VSNPRINTF | |
65 # define HAVE_VSNPRINTF | |
66 # endif | |
67 #endif | |
68 | |
69 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) | |
70 # ifndef HAVE_VSNPRINTF | |
71 # define HAVE_VSNPRINTF | |
72 # endif | |
73 #endif | |
74 | |
75 #ifndef HAVE_VSNPRINTF | |
76 # ifdef MSDOS | |
77 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?), | |
78 but for now we just assume it doesn't. */ | |
79 # define NO_vsnprintf | |
80 # endif | |
81 # ifdef __TURBOC__ | |
82 # define NO_vsnprintf | |
83 # endif | |
84 # ifdef WIN32 | |
85 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ | |
86 # if !defined(vsnprintf) && !defined(NO_vsnprintf) | |
87 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) | |
88 # define vsnprintf _vsnprintf | |
89 # endif | |
90 # endif | |
91 # endif | |
92 # ifdef __SASC | |
93 # define NO_vsnprintf | |
94 # endif | |
95 # ifdef VMS | |
96 # define NO_vsnprintf | |
97 # endif | |
98 # ifdef __OS400__ | |
99 # define NO_vsnprintf | |
100 # endif | |
101 # ifdef __MVS__ | |
102 # define NO_vsnprintf | |
103 # endif | |
104 #endif | |
105 | |
106 /* unlike snprintf (which is required in C99), _snprintf does not guarantee | |
107 null termination of the result -- however this is only used in gzlib.c where | |
108 the result is assured to fit in the space provided */ | |
109 #if defined(_MSC_VER) && _MSC_VER < 1900 | |
110 # define snprintf _snprintf | |
111 #endif | |
112 | |
113 #ifndef local | |
114 # define local static | |
115 #endif | |
116 /* since "static" is used to mean two completely different things in C, we | |
117 define "local" for the non-static meaning of "static", for readability | |
118 (compile with -Dlocal if your debugger can't find static symbols) */ | |
119 | |
120 /* gz* functions always use library allocation functions */ | |
121 #ifndef STDC | |
122 extern voidp malloc OF((uInt size)); | |
123 extern void free OF((voidpf ptr)); | |
124 #endif | |
125 | |
126 /* get errno and strerror definition */ | |
127 #if defined UNDER_CE | |
128 # include <windows.h> | |
129 # define zstrerror() gz_strwinerror((DWORD)GetLastError()) | |
130 #else | |
131 # ifndef NO_STRERROR | |
132 # include <errno.h> | |
133 # define zstrerror() strerror(errno) | |
134 # else | |
135 # define zstrerror() "stdio error (consult errno)" | |
136 # endif | |
137 #endif | |
138 | |
139 /* provide prototypes for these when building zlib without LFS */ | |
140 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 | |
141 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); | |
142 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); | |
143 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); | |
144 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); | |
145 #endif | |
146 | |
147 /* default memLevel */ | |
148 #if MAX_MEM_LEVEL >= 8 | |
149 # define DEF_MEM_LEVEL 8 | |
150 #else | |
151 # define DEF_MEM_LEVEL MAX_MEM_LEVEL | |
152 #endif | |
153 | |
154 /* default i/o buffer size -- double this for output when reading (this and | |
155 twice this must be able to fit in an unsigned type) */ | |
156 #define GZBUFSIZE 8192 | |
157 | |
158 /* gzip modes, also provide a little integrity check on the passed structure */ | |
159 #define GZ_NONE 0 | |
160 #define GZ_READ 7247 | |
161 #define GZ_WRITE 31153 | |
162 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ | |
163 | |
164 /* values for gz_state how */ | |
165 #define LOOK 0 /* look for a gzip header */ | |
166 #define COPY 1 /* copy input directly */ | |
167 #define GZIP 2 /* decompress a gzip stream */ | |
168 | |
169 /* internal gzip file state data structure */ | |
170 typedef struct { | |
171 /* exposed contents for gzgetc() macro */ | |
172 struct gzFile_s x; /* "x" for exposed */ | |
173 /* x.have: number of bytes available at x.next */ | |
174 /* x.next: next output data to deliver or write */ | |
175 /* x.pos: current position in uncompressed data */ | |
176 /* used for both reading and writing */ | |
177 int mode; /* see gzip modes above */ | |
178 int fd; /* file descriptor */ | |
179 char *path; /* path or fd for error messages */ | |
180 unsigned size; /* buffer size, zero if not allocated yet */ | |
181 unsigned want; /* requested buffer size, default is GZBUFSIZE */ | |
182 unsigned char *in; /* input buffer (double-sized when writing) */ | |
183 unsigned char *out; /* output buffer (double-sized when reading) */ | |
184 int direct; /* 0 if processing gzip, 1 if transparent */ | |
185 /* just for reading */ | |
186 int how; /* 0: get header, 1: copy, 2: decompress */ | |
187 z_off64_t start; /* where the gzip data started, for rewinding */ | |
188 int eof; /* true if end of input file reached */ | |
189 int past; /* true if read requested past end */ | |
190 /* just for writing */ | |
191 int level; /* compression level */ | |
192 int strategy; /* compression strategy */ | |
193 /* seek request */ | |
194 z_off64_t skip; /* amount to skip (already rewound if backwards) */ | |
195 int seek; /* true if seek request pending */ | |
196 /* error information */ | |
197 int err; /* error code */ | |
198 char *msg; /* error message */ | |
199 /* zlib inflate or deflate stream */ | |
200 z_stream strm; /* stream structure in-place (not a pointer) */ | |
201 } gz_state; | |
202 typedef gz_state FAR *gz_statep; | |
203 | |
204 /* shared functions */ | |
205 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); | |
206 #if defined UNDER_CE | |
207 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); | |
208 #endif | |
209 | |
210 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t | |
211 value -- needed when comparing unsigned to z_off64_t, which is signed | |
212 (possible z_off64_t types off_t, off64_t, and long are all signed) */ | |
213 #ifdef INT_MAX | |
214 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) | |
215 #else | |
216 unsigned ZLIB_INTERNAL gz_intmax OF((void)); | |
217 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) | |
218 #endif |