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