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 #endif 42 43 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) 44 # include <io.h> 45 #endif 46 47 #if defined(_WIN32) || defined(__CYGWIN__) 48 # define WIDECHAR 49 #endif 50 51 #ifdef WINAPI_FAMILY 52 # define open _open 53 # define read _read 54 # define write _write 55 # define close _close 56 #endif 57 58 #ifdef NO_DEFLATE /* for compatibility with old definition */ 59 # define NO_GZCOMPRESS 60 #endif 61 62 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 63 # ifndef HAVE_VSNPRINTF 64 # define HAVE_VSNPRINTF 65 # endif 66 #endif 67 68 #if defined(__CYGWIN__) 69 # ifndef HAVE_VSNPRINTF 70 # define HAVE_VSNPRINTF 71 # endif 72 #endif 73 74 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 75 # ifndef HAVE_VSNPRINTF 76 # define HAVE_VSNPRINTF 77 # endif 78 #endif 79 80 #ifndef HAVE_VSNPRINTF 81 # ifdef MSDOS 82 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 83 but for now we just assume it doesn't. */ 84 # define NO_vsnprintf 85 # endif 86 # ifdef __TURBOC__ 87 # define NO_vsnprintf 88 # endif 89 # ifdef WIN32 90 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 91 # if !defined(vsnprintf) && !defined(NO_vsnprintf) 92 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 93 # define vsnprintf _vsnprintf 94 # endif 95 # endif 96 # endif 97 # ifdef __SASC 98 # define NO_vsnprintf 99 # endif 100 # ifdef VMS 101 # define NO_vsnprintf 102 # endif 103 # ifdef __OS400__ 104 # define NO_vsnprintf 105 # endif 106 # ifdef __MVS__ 107 # define NO_vsnprintf 108 # endif 109 #endif 110 111 /* unlike snprintf (which is required in C99), _snprintf does not guarantee 112 null termination of the result -- however this is only used in gzlib.c where 113 the result is assured to fit in the space provided */ 114 #if defined(_MSC_VER) && _MSC_VER < 1900 115 # define snprintf _snprintf 116 #endif 117 118 #ifndef local 119 # define local static 120 #endif 121 /* since "static" is used to mean two completely different things in C, we 122 define "local" for the non-static meaning of "static", for readability 123 (compile with -Dlocal if your debugger can't find static symbols) */ 124 125 /* gz* functions always use library allocation functions */ 126 #ifndef STDC 127 extern voidp malloc OF((uInt size)); 128 extern void free OF((voidpf ptr)); 129 #endif 130 131 /* get errno and strerror definition */ 132 #if defined UNDER_CE 133 # include <windows.h> 134 # define zstrerror() gz_strwinerror((DWORD)GetLastError()) 135 #else 136 # ifndef NO_STRERROR 137 # include <errno.h> 138 # define zstrerror() strerror(errno) 139 # else 140 # define zstrerror() "stdio error (consult errno)" 141 # endif 142 #endif 143 144 /* provide prototypes for these when building zlib without LFS */ 145 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 146 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 147 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 148 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 149 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 150 #endif 151 152 /* default memLevel */ 153 #if MAX_MEM_LEVEL >= 8 154 # define DEF_MEM_LEVEL 8 155 #else 156 # define DEF_MEM_LEVEL MAX_MEM_LEVEL 157 #endif 158 159 /* default i/o buffer size -- double this for output when reading (this and 160 twice this must be able to fit in an unsigned type) */ 161 #define GZBUFSIZE 8192 162 163 /* gzip modes, also provide a little integrity check on the passed structure */ 164 #define GZ_NONE 0 165 #define GZ_READ 7247 166 #define GZ_WRITE 31153 167 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 168 169 /* values for gz_state how */ 170 #define LOOK 0 /* look for a gzip header */ 171 #define COPY 1 /* copy input directly */ 172 #define GZIP 2 /* decompress a gzip stream */ 173 174 /* internal gzip file state data structure */ 175 typedef struct { 176 /* exposed contents for gzgetc() macro */ 177 struct gzFile_s x; /* "x" for exposed */ 178 /* x.have: number of bytes available at x.next */ 179 /* x.next: next output data to deliver or write */ 180 /* x.pos: current position in uncompressed data */ 181 /* used for both reading and writing */ 182 int mode; /* see gzip modes above */ 183 int fd; /* file descriptor */ 184 char *path; /* path or fd for error messages */ 185 unsigned size; /* buffer size, zero if not allocated yet */ 186 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 187 unsigned char *in; /* input buffer (double-sized when writing) */ 188 unsigned char *out; /* output buffer (double-sized when reading) */ 189 int direct; /* 0 if processing gzip, 1 if transparent */ 190 /* just for reading */ 191 int how; /* 0: get header, 1: copy, 2: decompress */ 192 z_off64_t start; /* where the gzip data started, for rewinding */ 193 int eof; /* true if end of input file reached */ 194 int past; /* true if read requested past end */ 195 /* just for writing */ 196 int level; /* compression level */ 197 int strategy; /* compression strategy */ 198 /* seek request */ 199 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 200 int seek; /* true if seek request pending */ 201 /* error information */ 202 int err; /* error code */ 203 char *msg; /* error message */ 204 /* zlib inflate or deflate stream */ 205 z_stream strm; /* stream structure in-place (not a pointer) */ 206 } gz_state; 207 208 typedef union { 209 gz_state FAR *state; 210 gzFile file; 211 } gz_statep; 212 213 /* shared functions */ 214 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 215 #if defined UNDER_CE 216 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 217 #endif 218 219 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 220 value -- needed when comparing unsigned to z_off64_t, which is signed 221 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 222 #ifdef INT_MAX 223 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 224 #else 225 unsigned ZLIB_INTERNAL gz_intmax OF((void)); 226 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 227 #endif 228