gzguts.h
1 /* gzguts.h -- zlib internal header definitions for gz* operations 2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 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 29 #ifndef _POSIX_SOURCE 30 # define _POSIX_SOURCE 31 #endif 32 #include <fcntl.h> 33 34 #ifdef _WIN32 35 # include <stddef.h> 36 #endif 37 38 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) 39 # include <io.h> 40 #endif 41 42 #if defined(_WIN32) || defined(__CYGWIN__) 43 # define WIDECHAR 44 #endif 45 46 #ifdef WINAPI_FAMILY 47 # define open _open 48 # define read _read 49 # define write _write 50 # define close _close 51 #endif 52 53 #ifdef NO_DEFLATE /* for compatibility with old definition */ 54 # define NO_GZCOMPRESS 55 #endif 56 57 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 58 # ifndef HAVE_VSNPRINTF 59 # define HAVE_VSNPRINTF 60 # endif 61 #endif 62 63 #if defined(__CYGWIN__) 64 # ifndef HAVE_VSNPRINTF 65 # define HAVE_VSNPRINTF 66 # endif 67 #endif 68 69 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 70 # ifndef HAVE_VSNPRINTF 71 # define HAVE_VSNPRINTF 72 # endif 73 #endif 74 75 #ifndef HAVE_VSNPRINTF 76 # ifdef MSDOS 77 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 78 but for now we just assume it doesn't. */ 79 # define NO_vsnprintf 80 # endif 81 # ifdef __TURBOC__ 82 # define NO_vsnprintf 83 # endif 84 # ifdef WIN32 85 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 86 # if !defined(vsnprintf) && !defined(NO_vsnprintf) 87 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 88 # define vsnprintf _vsnprintf 89 # endif 90 # endif 91 # endif 92 # ifdef __SASC 93 # define NO_vsnprintf 94 # endif 95 # ifdef VMS 96 # define NO_vsnprintf 97 # endif 98 # ifdef __OS400__ 99 # define NO_vsnprintf 100 # endif 101 # ifdef __MVS__ 102 # define NO_vsnprintf 103 # endif 104 #endif 105 106 /* unlike snprintf (which is required in C99), _snprintf does not guarantee 107 null termination of the result -- however this is only used in gzlib.c where 108 the result is assured to fit in the space provided */ 109 #if defined(_MSC_VER) && _MSC_VER < 1900 110 # define snprintf _snprintf 111 #endif 112 113 #ifndef local 114 # define local static 115 #endif 116 /* since "static" is used to mean two completely different things in C, we 117 define "local" for the non-static meaning of "static", for readability 118 (compile with -Dlocal if your debugger can't find static symbols) */ 119 120 /* gz* functions always use library allocation functions */ 121 #ifndef STDC 122 extern voidp malloc OF((uInt size)); 123 extern void free OF((voidpf ptr)); 124 #endif 125 126 /* get errno and strerror definition */ 127 #if defined UNDER_CE 128 # include <windows.h> 129 # define zstrerror() gz_strwinerror((DWORD)GetLastError()) 130 #else 131 # ifndef NO_STRERROR 132 # include <errno.h> 133 # define zstrerror() strerror(errno) 134 # else 135 # define zstrerror() "stdio error (consult errno)" 136 # endif 137 #endif 138 139 /* provide prototypes for these when building zlib without LFS */ 140 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 141 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 142 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 143 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 144 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 145 #endif 146 147 /* default memLevel */ 148 #if MAX_MEM_LEVEL >= 8 149 # define DEF_MEM_LEVEL 8 150 #else 151 # define DEF_MEM_LEVEL MAX_MEM_LEVEL 152 #endif 153 154 /* default i/o buffer size -- double this for output when reading (this and 155 twice this must be able to fit in an unsigned type) */ 156 #define GZBUFSIZE 8192 157 158 /* gzip modes, also provide a little integrity check on the passed structure */ 159 #define GZ_NONE 0 160 #define GZ_READ 7247 161 #define GZ_WRITE 31153 162 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 163 164 /* values for gz_state how */ 165 #define LOOK 0 /* look for a gzip header */ 166 #define COPY 1 /* copy input directly */ 167 #define GZIP 2 /* decompress a gzip stream */ 168 169 /* internal gzip file state data structure */ 170 typedef struct { 171 /* exposed contents for gzgetc() macro */ 172 struct gzFile_s x; /* "x" for exposed */ 173 /* x.have: number of bytes available at x.next */ 174 /* x.next: next output data to deliver or write */ 175 /* x.pos: current position in uncompressed data */ 176 /* used for both reading and writing */ 177 int mode; /* see gzip modes above */ 178 int fd; /* file descriptor */ 179 char *path; /* path or fd for error messages */ 180 unsigned size; /* buffer size, zero if not allocated yet */ 181 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 182 unsigned char *in; /* input buffer (double-sized when writing) */ 183 unsigned char *out; /* output buffer (double-sized when reading) */ 184 int direct; /* 0 if processing gzip, 1 if transparent */ 185 /* just for reading */ 186 int how; /* 0: get header, 1: copy, 2: decompress */ 187 z_off64_t start; /* where the gzip data started, for rewinding */ 188 int eof; /* true if end of input file reached */ 189 int past; /* true if read requested past end */ 190 /* just for writing */ 191 int level; /* compression level */ 192 int strategy; /* compression strategy */ 193 /* seek request */ 194 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 195 int seek; /* true if seek request pending */ 196 /* error information */ 197 int err; /* error code */ 198 char *msg; /* error message */ 199 /* zlib inflate or deflate stream */ 200 z_stream strm; /* stream structure in-place (not a pointer) */ 201 } gz_state; 202 typedef gz_state FAR *gz_statep; 203 204 /* shared functions */ 205 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 206 #if defined UNDER_CE 207 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 208 #endif 209 210 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 211 value -- needed when comparing unsigned to z_off64_t, which is signed 212 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 213 #ifdef INT_MAX 214 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 215 #else 216 unsigned ZLIB_INTERNAL gz_intmax OF((void)); 217 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 218 #endif