gzguts.h revision 1.2
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 4 */ 5 6 #ifdef _LARGEFILE64_SOURCE 7 # ifndef _LARGEFILE_SOURCE 8 # define _LARGEFILE_SOURCE 1 9 # endif 10 # ifdef _FILE_OFFSET_BITS 11 # undef _FILE_OFFSET_BITS 12 # endif 13 #endif 14 15 #ifdef HAVE_HIDDEN 16 # define ZLIB_INTERNAL __attribute__((visibility ("hidden"))) 17 #else 18 # define ZLIB_INTERNAL 19 #endif 20 21 #include <stdio.h> 22 #include "zlib.h" 23 #ifdef STDC 24 # include <unistd.h> 25 # include <string.h> 26 # include <stdlib.h> 27 # include <limits.h> 28 #endif 29 30 #ifndef _POSIX_SOURCE 31 # define _POSIX_SOURCE 32 #endif 33 #include <fcntl.h> 34 35 #ifdef _WIN32 36 # include <stddef.h> 37 #endif 38 39 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) 40 # include <io.h> 41 #endif 42 43 #if defined(_WIN32) || defined(__CYGWIN__) 44 # define WIDECHAR 45 #endif 46 47 #ifdef WINAPI_FAMILY 48 # define open _open 49 # define read _read 50 # define write _write 51 # define close _close 52 #endif 53 54 #ifdef NO_DEFLATE /* for compatibility with old definition */ 55 # define NO_GZCOMPRESS 56 #endif 57 58 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 59 # ifndef HAVE_VSNPRINTF 60 # define HAVE_VSNPRINTF 61 # endif 62 #endif 63 64 #if defined(__CYGWIN__) 65 # ifndef HAVE_VSNPRINTF 66 # define HAVE_VSNPRINTF 67 # endif 68 #endif 69 70 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 71 # ifndef HAVE_VSNPRINTF 72 # define HAVE_VSNPRINTF 73 # endif 74 #endif 75 76 #ifndef HAVE_VSNPRINTF 77 # ifdef MSDOS 78 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 79 but for now we just assume it doesn't. */ 80 # define NO_vsnprintf 81 # endif 82 # ifdef __TURBOC__ 83 # define NO_vsnprintf 84 # endif 85 # ifdef WIN32 86 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 87 # if !defined(vsnprintf) && !defined(NO_vsnprintf) 88 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 89 # define vsnprintf _vsnprintf 90 # endif 91 # endif 92 # endif 93 # ifdef __SASC 94 # define NO_vsnprintf 95 # endif 96 # ifdef VMS 97 # define NO_vsnprintf 98 # endif 99 # ifdef __OS400__ 100 # define NO_vsnprintf 101 # endif 102 # ifdef __MVS__ 103 # define NO_vsnprintf 104 # endif 105 #endif 106 107 /* unlike snprintf (which is required in C99), _snprintf does not guarantee 108 null termination of the result -- however this is only used in gzlib.c where 109 the result is assured to fit in the space provided */ 110 #if defined(_MSC_VER) && _MSC_VER < 1900 111 # define snprintf _snprintf 112 #endif 113 114 #ifndef local 115 # define local static 116 #endif 117 /* since "static" is used to mean two completely different things in C, we 118 define "local" for the non-static meaning of "static", for readability 119 (compile with -Dlocal if your debugger can't find static symbols) */ 120 121 /* gz* functions always use library allocation functions */ 122 #ifndef STDC 123 extern voidp malloc OF((uInt size)); 124 extern void free OF((voidpf ptr)); 125 #endif 126 127 /* get errno and strerror definition */ 128 #if defined UNDER_CE 129 # include <windows.h> 130 # define zstrerror() gz_strwinerror((DWORD)GetLastError()) 131 #else 132 # ifndef NO_STRERROR 133 # include <errno.h> 134 # define zstrerror() strerror(errno) 135 # else 136 # define zstrerror() "stdio error (consult errno)" 137 # endif 138 #endif 139 140 /* provide prototypes for these when building zlib without LFS */ 141 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 142 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 143 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 144 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 145 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 146 #endif 147 148 /* default memLevel */ 149 #if MAX_MEM_LEVEL >= 8 150 # define DEF_MEM_LEVEL 8 151 #else 152 # define DEF_MEM_LEVEL MAX_MEM_LEVEL 153 #endif 154 155 /* default i/o buffer size -- double this for output when reading (this and 156 twice this must be able to fit in an unsigned type) */ 157 #define GZBUFSIZE 8192 158 159 /* gzip modes, also provide a little integrity check on the passed structure */ 160 #define GZ_NONE 0 161 #define GZ_READ 7247 162 #define GZ_WRITE 31153 163 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 164 165 /* values for gz_state how */ 166 #define LOOK 0 /* look for a gzip header */ 167 #define COPY 1 /* copy input directly */ 168 #define GZIP 2 /* decompress a gzip stream */ 169 170 /* internal gzip file state data structure */ 171 typedef struct { 172 /* exposed contents for gzgetc() macro */ 173 struct gzFile_s x; /* "x" for exposed */ 174 /* x.have: number of bytes available at x.next */ 175 /* x.next: next output data to deliver or write */ 176 /* x.pos: current position in uncompressed data */ 177 /* used for both reading and writing */ 178 int mode; /* see gzip modes above */ 179 int fd; /* file descriptor */ 180 char *path; /* path or fd for error messages */ 181 unsigned size; /* buffer size, zero if not allocated yet */ 182 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 183 unsigned char *in; /* input buffer (double-sized when writing) */ 184 unsigned char *out; /* output buffer (double-sized when reading) */ 185 int direct; /* 0 if processing gzip, 1 if transparent */ 186 /* just for reading */ 187 int how; /* 0: get header, 1: copy, 2: decompress */ 188 z_off64_t start; /* where the gzip data started, for rewinding */ 189 int eof; /* true if end of input file reached */ 190 int past; /* true if read requested past end */ 191 /* just for writing */ 192 int level; /* compression level */ 193 int strategy; /* compression strategy */ 194 /* seek request */ 195 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 196 int seek; /* true if seek request pending */ 197 /* error information */ 198 int err; /* error code */ 199 char *msg; /* error message */ 200 /* zlib inflate or deflate stream */ 201 z_stream strm; /* stream structure in-place (not a pointer) */ 202 } gz_state; 203 typedef gz_state FAR *gz_statep; 204 205 /* shared functions */ 206 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 207 #if defined UNDER_CE 208 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 209 #endif 210 211 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 212 value -- needed when comparing unsigned to z_off64_t, which is signed 213 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 214 #ifdef INT_MAX 215 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 216 #else 217 unsigned ZLIB_INTERNAL gz_intmax OF((void)); 218 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 219 #endif 220
Indexes created Fri Sep 26 08:10:20 GMT 2025