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comparison mupdf-source/thirdparty/zlib/gzguts.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /* gzguts.h -- zlib internal header definitions for gz* operations
2 * Copyright (C) 2004-2024 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 # undef _FILE_OFFSET_BITS
11 # undef _TIME_BITS
12 #endif
13
14 #ifdef HAVE_HIDDEN
15 # define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
16 #else
17 # define ZLIB_INTERNAL
18 #endif
19
20 #include <stdio.h>
21 #include "zlib.h"
22 #ifdef STDC
23 # include <string.h>
24 # include <stdlib.h>
25 # include <limits.h>
26 #endif
27
28 #ifndef _POSIX_SOURCE
29 # define _POSIX_SOURCE
30 #endif
31 #include <fcntl.h>
32
33 #ifdef _WIN32
34 # include <stddef.h>
35 #endif
36
37 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
38 # include <io.h>
39 #endif
40
41 #if defined(_WIN32)
42 # define WIDECHAR
43 #endif
44
45 #ifdef WINAPI_FAMILY
46 # define open _open
47 # define read _read
48 # define write _write
49 # define close _close
50 #endif
51
52 #ifdef NO_DEFLATE /* for compatibility with old definition */
53 # define NO_GZCOMPRESS
54 #endif
55
56 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
57 # ifndef HAVE_VSNPRINTF
58 # define HAVE_VSNPRINTF
59 # endif
60 #endif
61
62 #if defined(__CYGWIN__)
63 # ifndef HAVE_VSNPRINTF
64 # define HAVE_VSNPRINTF
65 # endif
66 #endif
67
68 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
69 # ifndef HAVE_VSNPRINTF
70 # define HAVE_VSNPRINTF
71 # endif
72 #endif
73
74 #ifndef HAVE_VSNPRINTF
75 # ifdef MSDOS
76 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
77 but for now we just assume it doesn't. */
78 # define NO_vsnprintf
79 # endif
80 # ifdef __TURBOC__
81 # define NO_vsnprintf
82 # endif
83 # ifdef WIN32
84 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
85 # if !defined(vsnprintf) && !defined(NO_vsnprintf)
86 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
87 # define vsnprintf _vsnprintf
88 # endif
89 # endif
90 # endif
91 # ifdef __SASC
92 # define NO_vsnprintf
93 # endif
94 # ifdef VMS
95 # define NO_vsnprintf
96 # endif
97 # ifdef __OS400__
98 # define NO_vsnprintf
99 # endif
100 # ifdef __MVS__
101 # define NO_vsnprintf
102 # endif
103 #endif
104
105 /* unlike snprintf (which is required in C99), _snprintf does not guarantee
106 null termination of the result -- however this is only used in gzlib.c where
107 the result is assured to fit in the space provided */
108 #if defined(_MSC_VER) && _MSC_VER < 1900
109 # define snprintf _snprintf
110 #endif
111
112 #ifndef local
113 # define local static
114 #endif
115 /* since "static" is used to mean two completely different things in C, we
116 define "local" for the non-static meaning of "static", for readability
117 (compile with -Dlocal if your debugger can't find static symbols) */
118
119 /* gz* functions always use library allocation functions */
120 #ifndef STDC
121 extern voidp malloc(uInt size);
122 extern void free(voidpf ptr);
123 #endif
124
125 /* get errno and strerror definition */
126 #if defined UNDER_CE
127 # include <windows.h>
128 # define zstrerror() gz_strwinerror((DWORD)GetLastError())
129 #else
130 # ifndef NO_STRERROR
131 # include <errno.h>
132 # define zstrerror() strerror(errno)
133 # else
134 # define zstrerror() "stdio error (consult errno)"
135 # endif
136 #endif
137
138 /* provide prototypes for these when building zlib without LFS */
139 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
140 ZEXTERN gzFile ZEXPORT gzopen64(const char *, const char *);
141 ZEXTERN z_off64_t ZEXPORT gzseek64(gzFile, z_off64_t, int);
142 ZEXTERN z_off64_t ZEXPORT gztell64(gzFile);
143 ZEXTERN z_off64_t ZEXPORT gzoffset64(gzFile);
144 #endif
145
146 /* default memLevel */
147 #if MAX_MEM_LEVEL >= 8
148 # define DEF_MEM_LEVEL 8
149 #else
150 # define DEF_MEM_LEVEL MAX_MEM_LEVEL
151 #endif
152
153 /* default i/o buffer size -- double this for output when reading (this and
154 twice this must be able to fit in an unsigned type) */
155 #define GZBUFSIZE 8192
156
157 /* gzip modes, also provide a little integrity check on the passed structure */
158 #define GZ_NONE 0
159 #define GZ_READ 7247
160 #define GZ_WRITE 31153
161 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
162
163 /* values for gz_state how */
164 #define LOOK 0 /* look for a gzip header */
165 #define COPY 1 /* copy input directly */
166 #define GZIP 2 /* decompress a gzip stream */
167
168 /* internal gzip file state data structure */
169 typedef struct {
170 /* exposed contents for gzgetc() macro */
171 struct gzFile_s x; /* "x" for exposed */
172 /* x.have: number of bytes available at x.next */
173 /* x.next: next output data to deliver or write */
174 /* x.pos: current position in uncompressed data */
175 /* used for both reading and writing */
176 int mode; /* see gzip modes above */
177 int fd; /* file descriptor */
178 char *path; /* path or fd for error messages */
179 unsigned size; /* buffer size, zero if not allocated yet */
180 unsigned want; /* requested buffer size, default is GZBUFSIZE */
181 unsigned char *in; /* input buffer (double-sized when writing) */
182 unsigned char *out; /* output buffer (double-sized when reading) */
183 int direct; /* 0 if processing gzip, 1 if transparent */
184 /* just for reading */
185 int how; /* 0: get header, 1: copy, 2: decompress */
186 z_off64_t start; /* where the gzip data started, for rewinding */
187 int eof; /* true if end of input file reached */
188 int past; /* true if read requested past end */
189 /* just for writing */
190 int level; /* compression level */
191 int strategy; /* compression strategy */
192 int reset; /* true if a reset is pending after a Z_FINISH */
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(gz_statep, int, const char *);
206 #if defined UNDER_CE
207 char ZLIB_INTERNAL *gz_strwinerror(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 unsigned ZLIB_INTERNAL gz_intmax(void);
214 #define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())