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 http://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
43 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
47 #if defined(_WIN32) || defined(__CYGWIN__)
58 #ifdef NO_DEFLATE /* for compatibility with old definition */
59 # define NO_GZCOMPRESS
62 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
63 # ifndef HAVE_VSNPRINTF
64 # define HAVE_VSNPRINTF
68 #if defined(__CYGWIN__)
69 # ifndef HAVE_VSNPRINTF
70 # define HAVE_VSNPRINTF
74 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
75 # ifndef HAVE_VSNPRINTF
76 # define HAVE_VSNPRINTF
80 #ifndef HAVE_VSNPRINTF
82 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
83 but for now we just assume it doesn't. */
90 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
91 # if !defined(vsnprintf) && !defined(NO_vsnprintf)
92 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
93 # define vsnprintf _vsnprintf
101 # define NO_vsnprintf
104 # define NO_vsnprintf
107 # define NO_vsnprintf
111 /* unlike snprintf (which is required in C99), _snprintf does not guarantee
112 null termination of the result -- however this is only used in gzlib.c where
113 the result is assured to fit in the space provided */
114 #if defined(_MSC_VER) && _MSC_VER < 1900
115 # define snprintf _snprintf
119 # define local static
121 /* since "static" is used to mean two completely different things in C, we
122 define "local" for the non-static meaning of "static", for readability
123 (compile with -Dlocal if your debugger can't find static symbols) */
125 /* gz* functions always use library allocation functions */
127 extern voidp malloc OF((uInt size));
128 extern void free OF((voidpf ptr));
131 /* get errno and strerror definition */
133 # include <windows.h>
134 # define zstrerror() gz_strwinerror((DWORD)GetLastError())
138 # define zstrerror() strerror(errno)
140 # define zstrerror() "stdio error (consult errno)"
144 /* provide prototypes for these when building zlib without LFS */
145 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
146 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
147 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
148 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
149 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
152 /* default memLevel */
153 #if MAX_MEM_LEVEL >= 8
154 # define DEF_MEM_LEVEL 8
156 # define DEF_MEM_LEVEL MAX_MEM_LEVEL
159 /* default i/o buffer size -- double this for output when reading (this and
160 twice this must be able to fit in an unsigned type) */
161 #define GZBUFSIZE 8192
163 /* gzip modes, also provide a little integrity check on the passed structure */
166 #define GZ_WRITE 31153
167 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
169 /* values for gz_state how */
170 #define LOOK 0 /* look for a gzip header */
171 #define COPY 1 /* copy input directly */
172 #define GZIP 2 /* decompress a gzip stream */
174 /* internal gzip file state data structure */
176 /* exposed contents for gzgetc() macro */
177 struct gzFile_s x; /* "x" for exposed */
178 /* x.have: number of bytes available at x.next */
179 /* x.next: next output data to deliver or write */
180 /* x.pos: current position in uncompressed data */
181 /* used for both reading and writing */
182 int mode; /* see gzip modes above */
183 int fd; /* file descriptor */
184 char *path; /* path or fd for error messages */
185 unsigned size; /* buffer size, zero if not allocated yet */
186 unsigned want; /* requested buffer size, default is GZBUFSIZE */
187 unsigned char *in; /* input buffer (double-sized when writing) */
188 unsigned char *out; /* output buffer (double-sized when reading) */
189 int direct; /* 0 if processing gzip, 1 if transparent */
190 /* just for reading */
191 int how; /* 0: get header, 1: copy, 2: decompress */
192 z_off64_t start; /* where the gzip data started, for rewinding */
193 int eof; /* true if end of input file reached */
194 int past; /* true if read requested past end */
195 /* just for writing */
196 int level; /* compression level */
197 int strategy; /* compression strategy */
199 z_off64_t skip; /* amount to skip (already rewound if backwards) */
200 int seek; /* true if seek request pending */
201 /* error information */
202 int err; /* error code */
203 char *msg; /* error message */
204 /* zlib inflate or deflate stream */
205 z_stream strm; /* stream structure in-place (not a pointer) */
213 /* shared functions */
214 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
216 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
219 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
220 value -- needed when comparing unsigned to z_off64_t, which is signed
221 (possible z_off64_t types off_t, off64_t, and long are all signed) */
223 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
225 unsigned ZLIB_INTERNAL gz_intmax OF((void));
226 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())