1 /* gzguts.h contains minimal changes required to be compiled with zlibWrapper:
2 * - #include "zlib.h" was changed to #include "zstd_zlibwrapper.h"
3 * - gz_statep was converted to union to work with -Wstrict-aliasing=1 */
5 /* gzguts.h -- zlib internal header definitions for gz* operations
6 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
7 * For conditions of distribution and use, see https://www.zlib.net/zlib_license.html
10 #ifdef _LARGEFILE64_SOURCE
11 # ifndef _LARGEFILE_SOURCE
12 # define _LARGEFILE_SOURCE 1
14 # ifdef _FILE_OFFSET_BITS
15 # undef _FILE_OFFSET_BITS
20 # define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
22 # define ZLIB_INTERNAL
26 #include "zstd_zlibwrapper.h"
27 #include "gzcompatibility.h"
35 # define _POSIX_SOURCE
45 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
60 #ifdef NO_DEFLATE /* for compatibility with old definition */
61 # define NO_GZCOMPRESS
64 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
65 # ifndef HAVE_VSNPRINTF
66 # define HAVE_VSNPRINTF
70 #if defined(__CYGWIN__)
71 # ifndef HAVE_VSNPRINTF
72 # define HAVE_VSNPRINTF
76 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
77 # ifndef HAVE_VSNPRINTF
78 # define HAVE_VSNPRINTF
82 #ifndef HAVE_VSNPRINTF
84 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
85 but for now we just assume it doesn't. */
92 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
93 # if !defined(vsnprintf) && !defined(NO_vsnprintf)
94 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
95 # define vsnprintf _vsnprintf
100 # define NO_vsnprintf
103 # define NO_vsnprintf
106 # define NO_vsnprintf
109 # define NO_vsnprintf
113 /* unlike snprintf (which is required in C99), _snprintf does not guarantee
114 null termination of the result -- however this is only used in gzlib.c where
115 the result is assured to fit in the space provided */
116 #if defined(_MSC_VER) && _MSC_VER < 1900
117 # define snprintf _snprintf
121 # define local static
123 /* since "static" is used to mean two completely different things in C, we
124 define "local" for the non-static meaning of "static", for readability
125 (compile with -Dlocal if your debugger can't find static symbols) */
127 /* gz* functions always use library allocation functions */
129 extern voidp malloc _Z_OF((uInt size));
130 extern void free _Z_OF((voidpf ptr));
133 /* get errno and strerror definition */
135 # include <windows.h>
136 # define zstrerror() gz_strwinerror((DWORD)GetLastError())
140 # define zstrerror() strerror(errno)
142 # define zstrerror() "stdio error (consult errno)"
146 /* provide prototypes for these when building zlib without LFS */
147 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
148 ZEXTERN gzFile ZEXPORT gzopen64 _Z_OF((const char *, const char *));
149 ZEXTERN z_off64_t ZEXPORT gzseek64 _Z_OF((gzFile, z_off64_t, int));
150 ZEXTERN z_off64_t ZEXPORT gztell64 _Z_OF((gzFile));
151 ZEXTERN z_off64_t ZEXPORT gzoffset64 _Z_OF((gzFile));
154 /* default memLevel */
155 #if MAX_MEM_LEVEL >= 8
156 # define DEF_MEM_LEVEL 8
158 # define DEF_MEM_LEVEL MAX_MEM_LEVEL
161 /* default i/o buffer size -- double this for output when reading (this and
162 twice this must be able to fit in an unsigned type) */
163 #define GZBUFSIZE 8192
165 /* gzip modes, also provide a little integrity check on the passed structure */
168 #define GZ_WRITE 31153
169 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
171 /* values for gz_state how */
172 #define LOOK 0 /* look for a gzip header */
173 #define COPY 1 /* copy input directly */
174 #define GZIP 2 /* decompress a gzip stream */
176 /* internal gzip file state data structure */
178 /* exposed contents for gzgetc() macro */
179 struct gzFile_s x; /* "x" for exposed */
180 /* x.have: number of bytes available at x.next */
181 /* x.next: next output data to deliver or write */
182 /* x.pos: current position in uncompressed data */
183 /* used for both reading and writing */
184 int mode; /* see gzip modes above */
185 int fd; /* file descriptor */
186 char *path; /* path or fd for error messages */
187 unsigned size; /* buffer size, zero if not allocated yet */
188 unsigned want; /* requested buffer size, default is GZBUFSIZE */
189 unsigned char *in; /* input buffer (double-sized when writing) */
190 unsigned char *out; /* output buffer (double-sized when reading) */
191 int direct; /* 0 if processing gzip, 1 if transparent */
192 /* just for reading */
193 int how; /* 0: get header, 1: copy, 2: decompress */
194 z_off64_t start; /* where the gzip data started, for rewinding */
195 int eof; /* true if end of input file reached */
196 int past; /* true if read requested past end */
197 /* just for writing */
198 int level; /* compression level */
199 int strategy; /* compression strategy */
201 z_off64_t skip; /* amount to skip (already rewound if backwards) */
202 int seek; /* true if seek request pending */
203 /* error information */
204 int err; /* error code */
205 char *msg; /* error message */
206 /* zlib inflate or deflate stream */
207 z_stream strm; /* stream structure in-place (not a pointer) */
215 /* shared functions */
216 void ZLIB_INTERNAL gz_error _Z_OF((gz_statep, int, const char *));
218 char ZLIB_INTERNAL *gz_strwinerror _Z_OF((DWORD error));
221 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
222 value -- needed when comparing unsigned to z_off64_t, which is signed
223 (possible z_off64_t types off_t, off64_t, and long are all signed) */
225 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
227 unsigned ZLIB_INTERNAL gz_intmax _Z_OF((void));
228 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())