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 #if defined(_WIN32) 22 #include <io.h> 23 #else 24 #include <unistd.h> 25 #endif 26 27 #include <stdio.h> 28 #include "zlib.h" 29 #ifdef STDC 30 # include <string.h> 31 # include <stdlib.h> 32 # include <limits.h> 33 #endif 34 35 #ifndef _POSIX_SOURCE 36 # define _POSIX_SOURCE 37 #endif 38 #include <fcntl.h> 39 40 #ifdef _WIN32 41 # include <stddef.h> 42 #endif 43 44 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) 45 # include <io.h> 46 #endif 47 48 #if defined(_WIN32) || defined(__CYGWIN__) 49 # define WIDECHAR 50 #endif 51 52 #ifdef WINAPI_FAMILY 53 # define open _open 54 # define read _read 55 # define write _write 56 # define close _close 57 #endif 58 59 #ifdef NO_DEFLATE /* for compatibility with old definition */ 60 # define NO_GZCOMPRESS 61 #endif 62 63 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 64 # ifndef HAVE_VSNPRINTF 65 # define HAVE_VSNPRINTF 66 # endif 67 #endif 68 69 #if defined(__CYGWIN__) 70 # ifndef HAVE_VSNPRINTF 71 # define HAVE_VSNPRINTF 72 # endif 73 #endif 74 75 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 76 # ifndef HAVE_VSNPRINTF 77 # define HAVE_VSNPRINTF 78 # endif 79 #endif 80 81 #ifndef HAVE_VSNPRINTF 82 # ifdef MSDOS 83 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 84 but for now we just assume it doesn't. */ 85 # define NO_vsnprintf 86 # endif 87 # ifdef __TURBOC__ 88 # define NO_vsnprintf 89 # endif 90 # ifdef WIN32 91 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 92 # if !defined(vsnprintf) && !defined(NO_vsnprintf) 93 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 94 # define vsnprintf _vsnprintf 95 # endif 96 # endif 97 # endif 98 # ifdef __SASC 99 # define NO_vsnprintf 100 # endif 101 # ifdef VMS 102 # define NO_vsnprintf 103 # endif 104 # ifdef __OS400__ 105 # define NO_vsnprintf 106 # endif 107 # ifdef __MVS__ 108 # define NO_vsnprintf 109 # endif 110 #endif 111 112 /* unlike snprintf (which is required in C99), _snprintf does not guarantee 113 null termination of the result -- however this is only used in gzlib.c where 114 the result is assured to fit in the space provided */ 115 #if defined(_MSC_VER) && _MSC_VER < 1900 116 # define snprintf _snprintf 117 #endif 118 119 #ifndef local 120 # define local static 121 #endif 122 /* since "static" is used to mean two completely different things in C, we 123 define "local" for the non-static meaning of "static", for readability 124 (compile with -Dlocal if your debugger can't find static symbols) */ 125 126 /* gz* functions always use library allocation functions */ 127 #ifndef STDC 128 extern voidp malloc OF((uInt size)); 129 extern void free OF((voidpf ptr)); 130 #endif 131 132 /* get errno and strerror definition */ 133 #if defined UNDER_CE 134 # include <Windows.h> 135 # define zstrerror() gz_strwinerror((DWORD)GetLastError()) 136 #else 137 # ifndef NO_STRERROR 138 # include <errno.h> 139 # define zstrerror() strerror(errno) 140 # else 141 # define zstrerror() "stdio error (consult errno)" 142 # endif 143 #endif 144 145 /* provide prototypes for these when building zlib without LFS */ 146 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 147 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 148 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 149 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 150 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 151 #endif 152 153 /* default memLevel */ 154 #if MAX_MEM_LEVEL >= 8 155 # define DEF_MEM_LEVEL 8 156 #else 157 # define DEF_MEM_LEVEL MAX_MEM_LEVEL 158 #endif 159 160 /* default i/o buffer size -- double this for output when reading (this and 161 twice this must be able to fit in an unsigned type) */ 162 #define GZBUFSIZE 8192 163 164 /* gzip modes, also provide a little integrity check on the passed structure */ 165 #define GZ_NONE 0 166 #define GZ_READ 7247 167 #define GZ_WRITE 31153 168 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 169 170 /* values for gz_state how */ 171 #define LOOK 0 /* look for a gzip header */ 172 #define COPY 1 /* copy input directly */ 173 #define GZIP 2 /* decompress a gzip stream */ 174 175 /* internal gzip file state data structure */ 176 typedef struct { 177 /* exposed contents for gzgetc() macro */ 178 struct gzFile_s x; /* "x" for exposed */ 179 /* x.have: number of bytes available at x.next */ 180 /* x.next: next output data to deliver or write */ 181 /* x.pos: current position in uncompressed data */ 182 /* used for both reading and writing */ 183 int mode; /* see gzip modes above */ 184 int fd; /* file descriptor */ 185 char *path; /* path or fd for error messages */ 186 unsigned size; /* buffer size, zero if not allocated yet */ 187 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 188 unsigned char *in; /* input buffer (double-sized when writing) */ 189 unsigned char *out; /* output buffer (double-sized when reading) */ 190 int direct; /* 0 if processing gzip, 1 if transparent */ 191 /* just for reading */ 192 int how; /* 0: get header, 1: copy, 2: decompress */ 193 z_off64_t start; /* where the gzip data started, for rewinding */ 194 int eof; /* true if end of input file reached */ 195 int past; /* true if read requested past end */ 196 /* just for writing */ 197 int level; /* compression level */ 198 int strategy; /* compression strategy */ 199 /* seek request */ 200 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 201 int seek; /* true if seek request pending */ 202 /* error information */ 203 int err; /* error code */ 204 char *msg; /* error message */ 205 /* zlib inflate or deflate stream */ 206 z_stream strm; /* stream structure in-place (not a pointer) */ 207 } gz_state; 208 typedef gz_state FAR *gz_statep; 209 210 /* shared functions */ 211 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 212 #if defined UNDER_CE 213 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 214 #endif 215 216 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 217 value -- needed when comparing unsigned to z_off64_t, which is signed 218 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 219 #ifdef INT_MAX 220 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 221 #else 222 unsigned ZLIB_INTERNAL gz_intmax OF((void)); 223 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 224 #endif 225