1 /* gzguts.h -- zlib internal header definitions for gz* operations 2 * Copyright (C) 2004, 2005, 2010, 2011, 2012 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 #if ((__GNUC__-0) * 10 + __GNUC_MINOR__-0 >= 33) && !defined(NO_VIZ) 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 <string.h> 25 # include <stdlib.h> 26 # include <limits.h> 27 #endif 28 #include <fcntl.h> 29 30 #ifdef __TURBOC__ 31 # include <io.h> 32 #endif 33 34 #ifdef NO_DEFLATE /* for compatibility with old definition */ 35 # define NO_GZCOMPRESS 36 #endif 37 38 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 39 # ifndef HAVE_VSNPRINTF 40 # define HAVE_VSNPRINTF 41 # endif 42 #endif 43 44 #if defined(__CYGWIN__) 45 # ifndef HAVE_VSNPRINTF 46 # define HAVE_VSNPRINTF 47 # endif 48 #endif 49 50 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 51 # ifndef HAVE_VSNPRINTF 52 # define HAVE_VSNPRINTF 53 # endif 54 #endif 55 56 #ifndef HAVE_VSNPRINTF 57 # ifdef MSDOS 58 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 59 but for now we just assume it doesn't. */ 60 # define NO_vsnprintf 61 # endif 62 # ifdef __TURBOC__ 63 # define NO_vsnprintf 64 # endif 65 # ifdef WIN32 66 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 67 # if !defined(vsnprintf) && !defined(NO_vsnprintf) 68 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 69 # include <io.h> 70 # define vsnprintf _vsnprintf 71 # endif 72 # endif 73 # endif 74 # ifdef __SASC 75 # define NO_vsnprintf 76 # endif 77 # ifdef VMS 78 # define NO_vsnprintf 79 # endif 80 # ifdef __OS400__ 81 # define NO_vsnprintf 82 # endif 83 # ifdef __MVS__ 84 # define NO_vsnprintf 85 # endif 86 #endif 87 88 #ifndef local 89 # define local static 90 #endif 91 /* compile with -Dlocal if your debugger can't find static symbols */ 92 93 /* gz* functions always use library allocation functions */ 94 #ifndef STDC 95 extern voidp malloc OF((uInt size)); 96 extern void free OF((voidpf ptr)); 97 #endif 98 99 /* get errno and strerror definition */ 100 #if defined UNDER_CE 101 # include <windows.h> 102 # define zstrerror() gz_strwinerror((DWORD)GetLastError()) 103 #else 104 # ifdef STDC 105 # include <errno.h> 106 # define zstrerror() strerror(errno) 107 # else 108 # define zstrerror() "stdio error (consult errno)" 109 # endif 110 #endif 111 112 /* provide prototypes for these when building zlib without LFS */ 113 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 114 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 115 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 116 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 117 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 118 #endif 119 120 /* default memLevel */ 121 #if MAX_MEM_LEVEL >= 8 122 # define DEF_MEM_LEVEL 8 123 #else 124 # define DEF_MEM_LEVEL MAX_MEM_LEVEL 125 #endif 126 127 /* default i/o buffer size -- double this for output when reading */ 128 #define GZBUFSIZE 8192 129 130 /* gzip modes, also provide a little integrity check on the passed structure */ 131 #define GZ_NONE 0 132 #define GZ_READ 7247 133 #define GZ_WRITE 31153 134 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 135 136 /* values for gz_state how */ 137 #define LOOK 0 /* look for a gzip header */ 138 #define COPY 1 /* copy input directly */ 139 #define GZIP 2 /* decompress a gzip stream */ 140 141 /* internal gzip file state data structure */ 142 typedef struct { 143 /* exposed contents for gzgetc() macro */ 144 struct gzFile_s x; /* "x" for exposed */ 145 /* x.have: number of bytes available at x.next */ 146 /* x.next: next output data to deliver or write */ 147 /* x.pos: current position in uncompressed data */ 148 /* used for both reading and writing */ 149 int mode; /* see gzip modes above */ 150 int fd; /* file descriptor */ 151 char *path; /* path or fd for error messages */ 152 unsigned size; /* buffer size, zero if not allocated yet */ 153 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 154 unsigned char *in; /* input buffer */ 155 unsigned char *out; /* output buffer (double-sized when reading) */ 156 int direct; /* 0 if processing gzip, 1 if transparent */ 157 /* just for reading */ 158 int how; /* 0: get header, 1: copy, 2: decompress */ 159 z_off64_t start; /* where the gzip data started, for rewinding */ 160 int eof; /* true if end of input file reached */ 161 int past; /* true if read requested past end */ 162 /* just for writing */ 163 int level; /* compression level */ 164 int strategy; /* compression strategy */ 165 /* seek request */ 166 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 167 int seek; /* true if seek request pending */ 168 /* error information */ 169 int err; /* error code */ 170 char *msg; /* error message */ 171 /* zlib inflate or deflate stream */ 172 z_stream strm; /* stream structure in-place (not a pointer) */ 173 } gz_state; 174 typedef gz_state FAR *gz_statep; 175 176 /* shared functions */ 177 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 178 #if defined UNDER_CE 179 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 180 #endif 181 182 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 183 value -- needed when comparing unsigned to z_off64_t, which is signed 184 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 185 #ifdef INT_MAX 186 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 187 #else 188 unsigned ZLIB_INTERNAL gz_intmax OF((void)); 189 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 190 #endif 191
