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 #if defined(_FX_MANAGED_CODE_) && defined(__cplusplus) 120 extern "C" { 121 #endif 122 123 extern void* FXMEM_DefaultAlloc(size_t, int); 124 extern void FXMEM_DefaultFree(void*, int); 125 126 #if defined(_FX_MANAGED_CODE_) && defined(__cplusplus) 127 } 128 #endif 129 130 #define malloc(size) FXMEM_DefaultAlloc(size, 0) 131 #define free(ptr) FXMEM_DefaultFree(ptr, 0) 132 133 /* get errno and strerror definition */ 134 #if defined UNDER_CE 135 # include <windows.h> 136 # define zstrerror() gz_strwinerror((DWORD)GetLastError()) 137 #else 138 # ifndef NO_STRERROR 139 # include <errno.h> 140 # define zstrerror() strerror(errno) 141 # else 142 # define zstrerror() "stdio error (consult errno)" 143 # endif 144 #endif 145 146 /* provide prototypes for these when building zlib without LFS */ 147 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 148 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 149 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 150 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 151 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 152 #endif 153 154 /* default memLevel */ 155 #if MAX_MEM_LEVEL >= 8 156 # define DEF_MEM_LEVEL 8 157 #else 158 # define DEF_MEM_LEVEL MAX_MEM_LEVEL 159 #endif 160 161 /* default i/o buffer size -- double this for output when reading (this and 162 twice this must be able to fit in an unsigned type) */ 163 #define GZBUFSIZE 8192 164 165 /* gzip modes, also provide a little integrity check on the passed structure */ 166 #define GZ_NONE 0 167 #define GZ_READ 7247 168 #define GZ_WRITE 31153 169 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 170 171 /* values for gz_state how */ 172 #define LOOK 0 /* look for a gzip header */ 173 #define COPY 1 /* copy input directly */ 174 #define GZIP 2 /* decompress a gzip stream */ 175 176 /* internal gzip file state data structure */ 177 typedef struct { 178 /* exposed contents for gzgetc() macro */ 179 struct gzFile_s x; /* "x" for exposed */ 180 /* x.have: number of bytes available at x.next */ 181 /* x.next: next output data to deliver or write */ 182 /* x.pos: current position in uncompressed data */ 183 /* used for both reading and writing */ 184 int mode; /* see gzip modes above */ 185 int fd; /* file descriptor */ 186 char *path; /* path or fd for error messages */ 187 unsigned size; /* buffer size, zero if not allocated yet */ 188 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 189 unsigned char *in; /* input buffer */ 190 unsigned char *out; /* output buffer (double-sized when reading) */ 191 int direct; /* 0 if processing gzip, 1 if transparent */ 192 /* just for reading */ 193 int how; /* 0: get header, 1: copy, 2: decompress */ 194 z_off64_t start; /* where the gzip data started, for rewinding */ 195 int eof; /* true if end of input file reached */ 196 int past; /* true if read requested past end */ 197 /* just for writing */ 198 int level; /* compression level */ 199 int strategy; /* compression strategy */ 200 /* seek request */ 201 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 202 int seek; /* true if seek request pending */ 203 /* error information */ 204 int err; /* error code */ 205 char *msg; /* error message */ 206 /* zlib inflate or deflate stream */ 207 z_stream strm; /* stream structure in-place (not a pointer) */ 208 } gz_state; 209 typedef gz_state FAR *gz_statep; 210 211 /* shared functions */ 212 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 213 #if defined UNDER_CE 214 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 215 #endif 216 217 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 218 value -- needed when comparing unsigned to z_off64_t, which is signed 219 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 220 #ifdef INT_MAX 221 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 222 #else 223 unsigned ZLIB_INTERNAL gz_intmax OF((void)); 224 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 225 #endif 226
