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