1 /* gzguts.h -- zlib internal header definitions for gz* operations 2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 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 WINAPI_FAMILY 39 # define open _open 40 # define read _read 41 # define write _write 42 # define close _close 43 #endif 44 45 #ifdef NO_DEFLATE /* for compatibility with old definition */ 46 # define NO_GZCOMPRESS 47 #endif 48 49 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 50 # ifndef HAVE_VSNPRINTF 51 # define HAVE_VSNPRINTF 52 # endif 53 #endif 54 55 #if defined(__CYGWIN__) 56 # ifndef HAVE_VSNPRINTF 57 # define HAVE_VSNPRINTF 58 # endif 59 #endif 60 61 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 62 # ifndef HAVE_VSNPRINTF 63 # define HAVE_VSNPRINTF 64 # endif 65 #endif 66 67 #ifndef HAVE_VSNPRINTF 68 # ifdef MSDOS 69 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 70 but for now we just assume it doesn't. */ 71 # define NO_vsnprintf 72 # endif 73 # ifdef __TURBOC__ 74 # define NO_vsnprintf 75 # endif 76 # ifdef WIN32 77 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 78 # if !defined(vsnprintf) && !defined(NO_vsnprintf) 79 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 80 # define vsnprintf _vsnprintf 81 # endif 82 # endif 83 # endif 84 # ifdef __SASC 85 # define NO_vsnprintf 86 # endif 87 # ifdef VMS 88 # define NO_vsnprintf 89 # endif 90 # ifdef __OS400__ 91 # define NO_vsnprintf 92 # endif 93 # ifdef __MVS__ 94 # define NO_vsnprintf 95 # endif 96 #endif 97 98 /* unlike snprintf (which is required in C99, yet still not supported by 99 Microsoft more than a decade later!), _snprintf does not guarantee null 100 termination of the result -- however this is only used in gzlib.c where 101 the result is assured to fit in the space provided */ 102 #ifdef _MSC_VER 103 # define snprintf _snprintf 104 #endif 105 106 #ifndef local 107 # define local static 108 #endif 109 /* compile with -Dlocal if your debugger can't find static symbols */ 110 111 /* gz* functions always use library allocation functions */ 112 #ifndef STDC 113 extern voidp malloc OF((uInt size)); 114 extern void free OF((voidpf ptr)); 115 #endif 116 117 /* get errno and strerror definition */ 118 #if defined UNDER_CE 119 # include <windows.h> 120 # define zstrerror() gz_strwinerror((DWORD)GetLastError()) 121 #else 122 # ifndef NO_STRERROR 123 # include <errno.h> 124 # define zstrerror() strerror(errno) 125 # else 126 # define zstrerror() "stdio error (consult errno)" 127 # endif 128 #endif 129 130 /* provide prototypes for these when building zlib without LFS */ 131 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 132 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 133 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 134 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 135 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 136 #endif 137 138 /* default memLevel */ 139 #if MAX_MEM_LEVEL >= 8 140 # define DEF_MEM_LEVEL 8 141 #else 142 # define DEF_MEM_LEVEL MAX_MEM_LEVEL 143 #endif 144 145 /* default i/o buffer size -- double this for output when reading (this and 146 twice this must be able to fit in an unsigned type) */ 147 #define GZBUFSIZE 8192 148 149 /* gzip modes, also provide a little integrity check on the passed structure */ 150 #define GZ_NONE 0 151 #define GZ_READ 7247 152 #define GZ_WRITE 31153 153 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 154 155 /* values for gz_state how */ 156 #define LOOK 0 /* look for a gzip header */ 157 #define COPY 1 /* copy input directly */ 158 #define GZIP 2 /* decompress a gzip stream */ 159 160 /* internal gzip file state data structure */ 161 typedef struct { 162 /* exposed contents for gzgetc() macro */ 163 struct gzFile_s x; /* "x" for exposed */ 164 /* x.have: number of bytes available at x.next */ 165 /* x.next: next output data to deliver or write */ 166 /* x.pos: current position in uncompressed data */ 167 /* used for both reading and writing */ 168 int mode; /* see gzip modes above */ 169 int fd; /* file descriptor */ 170 char *path; /* path or fd for error messages */ 171 unsigned size; /* buffer size, zero if not allocated yet */ 172 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 173 unsigned char *in; /* input buffer */ 174 unsigned char *out; /* output buffer (double-sized when reading) */ 175 int direct; /* 0 if processing gzip, 1 if transparent */ 176 /* just for reading */ 177 int how; /* 0: get header, 1: copy, 2: decompress */ 178 z_off64_t start; /* where the gzip data started, for rewinding */ 179 int eof; /* true if end of input file reached */ 180 int past; /* true if read requested past end */ 181 /* just for writing */ 182 int level; /* compression level */ 183 int strategy; /* compression strategy */ 184 /* seek request */ 185 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 186 int seek; /* true if seek request pending */ 187 /* error information */ 188 int err; /* error code */ 189 char *msg; /* error message */ 190 /* zlib inflate or deflate stream */ 191 z_stream strm; /* stream structure in-place (not a pointer) */ 192 } gz_state; 193 typedef gz_state FAR *gz_statep; 194 195 /* shared functions */ 196 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 197 #if defined UNDER_CE 198 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 199 #endif 200 201 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 202 value -- needed when comparing unsigned to z_off64_t, which is signed 203 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 204 #ifdef INT_MAX 205 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 206 #else 207 unsigned ZLIB_INTERNAL gz_intmax OF((void)); 208 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 209 #endif 210