1 /* gzguts.h -- zlib internal header definitions for gz* operations
2 * Copyright (C) 2004, 2005, 2010, 2011 Mark Adler
3 * For conditions of distribution and use, see copyright notice in zlib.h
6 #ifdef _LARGEFILE64_SOURCE
7 # ifndef _LARGEFILE_SOURCE
8 # define _LARGEFILE_SOURCE 1
10 # ifdef _FILE_OFFSET_BITS
11 # undef _FILE_OFFSET_BITS
15 #if ((__GNUC__-0) * 10 + __GNUC_MINOR__-0 >= 33) && !defined(NO_VIZ)
16 # define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
18 # define ZLIB_INTERNAL
30 #ifdef NO_DEFLATE /* for compatibility with old definition */
31 # define NO_GZCOMPRESS
34 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
35 # ifndef HAVE_VSNPRINTF
36 # define HAVE_VSNPRINTF
40 #if defined(__CYGWIN__)
41 # ifndef HAVE_VSNPRINTF
42 # define HAVE_VSNPRINTF
46 #ifndef HAVE_VSNPRINTF
48 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
49 but for now we just assume it doesn't. */
56 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
57 # if !defined(vsnprintf) && !defined(NO_vsnprintf)
58 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
60 # define vsnprintf _vsnprintf
81 /* compile with -Dlocal if your debugger can't find static symbols */
83 /* gz* functions always use library allocation functions */
85 extern voidp malloc OF((uInt size));
86 extern void free OF((voidpf ptr));
89 /* get errno and strerror definition */
92 # define zstrerror() gz_strwinerror((DWORD)GetLastError())
96 # define zstrerror() strerror(errno)
98 # define zstrerror() "stdio error (consult errno)"
102 /* provide prototypes for these when building zlib without LFS */
103 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
104 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
105 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
106 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
107 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
110 /* default i/o buffer size -- double this for output when reading */
111 #define GZBUFSIZE 8192
113 /* gzip modes, also provide a little integrity check on the passed structure */
116 #define GZ_WRITE 31153
117 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
119 /* values for gz_state how */
120 #define LOOK 0 /* look for a gzip header */
121 #define COPY 1 /* copy input directly */
122 #define GZIP 2 /* decompress a gzip stream */
124 /* internal gzip file state data structure */
126 /* exposed contents for gzgetc() macro */
127 struct gzFile_s x; /* "x" for exposed */
128 /* x.have: number of bytes available at x.next */
129 /* x.next: next output data to deliver or write */
130 /* x.pos: current position in uncompressed data */
131 /* used for both reading and writing */
132 int mode; /* see gzip modes above */
133 int fd; /* file descriptor */
134 char *path; /* path or fd for error messages */
135 unsigned size; /* buffer size, zero if not allocated yet */
136 unsigned want; /* requested buffer size, default is GZBUFSIZE */
137 unsigned char *in; /* input buffer */
138 unsigned char *out; /* output buffer (double-sized when reading) */
139 /* just for reading */
140 int eof; /* true if end of input file reached */
141 z_off64_t start; /* where the gzip data started, for rewinding */
142 int how; /* 0: get header, 1: copy, 2: decompress */
143 int direct; /* true if last read direct, false if gzip */
144 /* just for writing */
145 int level; /* compression level */
146 int strategy; /* compression strategy */
148 z_off64_t skip; /* amount to skip (already rewound if backwards) */
149 int seek; /* true if seek request pending */
150 /* error information */
151 int err; /* error code */
152 char *msg; /* error message */
153 /* zlib inflate or deflate stream */
154 z_stream strm; /* stream structure in-place (not a pointer) */
156 typedef gz_state FAR *gz_statep;
158 /* shared functions */
159 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
161 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
164 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
165 value -- needed when comparing unsigned to z_off64_t, which is signed
166 (possible z_off64_t types off_t, off64_t, and long are all signed) */
168 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
170 unsigned ZLIB_INTERNAL gz_intmax OF((void));
171 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())