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