1 /* gzguts.h contains minimal changes required to be compiled with zlibWrapper: 2 * - #include "zlib.h" was changed to #include "zstd_zlibwrapper.h" 3 * - gz_statep was converted to union to work with -Wstrict-aliasing=1 */ 4 5 /* gzguts.h -- zlib internal header definitions for gz* operations 6 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler 7 * For conditions of distribution and use, see http://www.zlib.net/zlib_license.html 8 */ 9 10 #ifdef _LARGEFILE64_SOURCE 11 # ifndef _LARGEFILE_SOURCE 12 # define _LARGEFILE_SOURCE 1 13 # endif 14 # ifdef _FILE_OFFSET_BITS 15 # undef _FILE_OFFSET_BITS 16 # endif 17 #endif 18 19 #ifdef HAVE_HIDDEN 20 # define ZLIB_INTERNAL __attribute__((visibility ("hidden"))) 21 #else 22 # define ZLIB_INTERNAL 23 #endif 24 25 #include <stdio.h> 26 #include "zstd_zlibwrapper.h" 27 #include "gzcompatibility.h" 28 #ifdef STDC 29 # include <string.h> 30 # include <stdlib.h> 31 # include <limits.h> 32 #endif 33 34 #ifndef _POSIX_SOURCE 35 # define _POSIX_SOURCE 36 #endif 37 #include <fcntl.h> 38 39 #ifdef _WIN32 40 # include <stddef.h> 41 #else 42 # include <unistd.h> 43 #endif 44 45 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) 46 # include <io.h> 47 #endif 48 49 #if defined(_WIN32) 50 # define WIDECHAR 51 #endif 52 53 #ifdef WINAPI_FAMILY 54 # define open _open 55 # define read _read 56 # define write _write 57 # define close _close 58 #endif 59 60 #ifdef NO_DEFLATE /* for compatibility with old definition */ 61 # define NO_GZCOMPRESS 62 #endif 63 64 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 65 # ifndef HAVE_VSNPRINTF 66 # define HAVE_VSNPRINTF 67 # endif 68 #endif 69 70 #if defined(__CYGWIN__) 71 # ifndef HAVE_VSNPRINTF 72 # define HAVE_VSNPRINTF 73 # endif 74 #endif 75 76 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 77 # ifndef HAVE_VSNPRINTF 78 # define HAVE_VSNPRINTF 79 # endif 80 #endif 81 82 #ifndef HAVE_VSNPRINTF 83 # ifdef MSDOS 84 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 85 but for now we just assume it doesn't. */ 86 # define NO_vsnprintf 87 # endif 88 # ifdef __TURBOC__ 89 # define NO_vsnprintf 90 # endif 91 # ifdef WIN32 92 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 93 # if !defined(vsnprintf) && !defined(NO_vsnprintf) 94 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 95 # define vsnprintf _vsnprintf 96 # endif 97 # endif 98 # endif 99 # ifdef __SASC 100 # define NO_vsnprintf 101 # endif 102 # ifdef VMS 103 # define NO_vsnprintf 104 # endif 105 # ifdef __OS400__ 106 # define NO_vsnprintf 107 # endif 108 # ifdef __MVS__ 109 # define NO_vsnprintf 110 # endif 111 #endif 112 113 /* unlike snprintf (which is required in C99), _snprintf does not guarantee 114 null termination of the result -- however this is only used in gzlib.c where 115 the result is assured to fit in the space provided */ 116 #if defined(_MSC_VER) && _MSC_VER < 1900 117 # define snprintf _snprintf 118 #endif 119 120 #ifndef local 121 # define local static 122 #endif 123 /* since "static" is used to mean two completely different things in C, we 124 define "local" for the non-static meaning of "static", for readability 125 (compile with -Dlocal if your debugger can't find static symbols) */ 126 127 /* gz* functions always use library allocation functions */ 128 #ifndef STDC 129 extern voidp malloc OF((uInt size)); 130 extern void free OF((voidpf ptr)); 131 #endif 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 (double-sized when writing) */ 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; 209 210 typedef union { 211 gz_state FAR *state; 212 gzFile file; 213 } gz_statep; 214 215 /* shared functions */ 216 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 217 #if defined UNDER_CE 218 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 219 #endif 220 221 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 222 value -- needed when comparing unsigned to z_off64_t, which is signed 223 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 224 #ifdef INT_MAX 225 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 226 #else 227 unsigned ZLIB_INTERNAL gz_intmax OF((void)); 228 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 229 #endif 230