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 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
47 # ifndef HAVE_VSNPRINTF
48 # define HAVE_VSNPRINTF
52 #ifndef HAVE_VSNPRINTF
54 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
55 but for now we just assume it doesn't. */
62 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
63 # if !defined(vsnprintf) && !defined(NO_vsnprintf)
64 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
66 # define vsnprintf _vsnprintf
87 /* compile with -Dlocal if your debugger can't find static symbols */
89 /* gz* functions always use library allocation functions */
91 extern voidp malloc OF((uInt size));
92 extern void free OF((voidpf ptr));
95 /* get errno and strerror definition */
98 # define zstrerror() gz_strwinerror((DWORD)GetLastError())
102 # define zstrerror() strerror(errno)
104 # define zstrerror() "stdio error (consult errno)"
108 /* provide prototypes for these when building zlib without LFS */
109 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
110 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
111 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
112 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
113 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
116 /* default i/o buffer size -- double this for output when reading */
117 #define GZBUFSIZE 8192
119 /* gzip modes, also provide a little integrity check on the passed structure */
122 #define GZ_WRITE 31153
123 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
125 /* values for gz_state how */
126 #define LOOK 0 /* look for a gzip header */
127 #define COPY 1 /* copy input directly */
128 #define GZIP 2 /* decompress a gzip stream */
130 /* internal gzip file state data structure */
132 /* exposed contents for gzgetc() macro */
133 struct gzFile_s x; /* "x" for exposed */
134 /* x.have: number of bytes available at x.next */
135 /* x.next: next output data to deliver or write */
136 /* x.pos: current position in uncompressed data */
137 /* used for both reading and writing */
138 int mode; /* see gzip modes above */
139 int fd; /* file descriptor */
140 char *path; /* path or fd for error messages */
141 unsigned size; /* buffer size, zero if not allocated yet */
142 unsigned want; /* requested buffer size, default is GZBUFSIZE */
143 unsigned char *in; /* input buffer */
144 unsigned char *out; /* output buffer (double-sized when reading) */
145 int direct; /* 0 if processing gzip, 1 if transparent */
146 /* just for reading */
147 int eof; /* true if end of input file reached */
148 z_off64_t start; /* where the gzip data started, for rewinding */
149 int how; /* 0: get header, 1: copy, 2: decompress */
150 /* just for writing */
151 int level; /* compression level */
152 int strategy; /* compression strategy */
154 z_off64_t skip; /* amount to skip (already rewound if backwards) */
155 int seek; /* true if seek request pending */
156 /* error information */
157 int err; /* error code */
158 char *msg; /* error message */
159 /* zlib inflate or deflate stream */
160 z_stream strm; /* stream structure in-place (not a pointer) */
162 typedef gz_state FAR *gz_statep;
164 /* shared functions */
165 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
167 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
170 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
171 value -- needed when comparing unsigned to z_off64_t, which is signed
172 (possible z_off64_t types off_t, off64_t, and long are all signed) */
174 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
176 unsigned ZLIB_INTERNAL gz_intmax OF((void));
177 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())