1 /* gzguts.h -- zlib internal header definitions for gz* operations 2 * Copyright (C) 2004-2019 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 # undef _FILE_OFFSET_BITS 11 # undef _TIME_BITS 12 #endif 13 14 #ifdef HAVE_HIDDEN 15 # define ZLIB_INTERNAL __attribute__((visibility ("hidden"))) 16 #else 17 # define ZLIB_INTERNAL 18 #endif 19 20 #include <stdio.h> 21 #include "zlib.h" 22 #ifdef STDC 23 # include <string.h> 24 # include <stdlib.h> 25 # include <limits.h> 26 #endif 27 28 #ifndef _POSIX_SOURCE 29 # define _POSIX_SOURCE 30 #endif 31 #include <fcntl.h> 32 33 #ifdef _WIN32 34 # include <stddef.h> 35 #endif 36 37 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) 38 # include <io.h> 39 #endif 40 41 #if defined(_WIN32) 42 # define WIDECHAR 43 #endif 44 45 #ifdef WINAPI_FAMILY 46 # define open _open 47 # define read _read 48 # define write _write 49 # define close _close 50 #endif 51 52 #ifdef NO_DEFLATE /* for compatibility with old definition */ 53 # define NO_GZCOMPRESS 54 #endif 55 56 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 57 # ifndef HAVE_VSNPRINTF 58 # define HAVE_VSNPRINTF 59 # endif 60 #endif 61 62 #if defined(__CYGWIN__) 63 # ifndef HAVE_VSNPRINTF 64 # define HAVE_VSNPRINTF 65 # endif 66 #endif 67 68 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 69 # ifndef HAVE_VSNPRINTF 70 # define HAVE_VSNPRINTF 71 # endif 72 #endif 73 74 #ifndef HAVE_VSNPRINTF 75 # ifdef MSDOS 76 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 77 but for now we just assume it doesn't. */ 78 # define NO_vsnprintf 79 # endif 80 # ifdef __TURBOC__ 81 # define NO_vsnprintf 82 # endif 83 # ifdef WIN32 84 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 85 # if !defined(vsnprintf) && !defined(NO_vsnprintf) 86 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 87 # define vsnprintf _vsnprintf 88 # endif 89 # endif 90 # endif 91 # ifdef __SASC 92 # define NO_vsnprintf 93 # endif 94 # ifdef VMS 95 # define NO_vsnprintf 96 # endif 97 # ifdef __OS400__ 98 # define NO_vsnprintf 99 # endif 100 # ifdef __MVS__ 101 # define NO_vsnprintf 102 # endif 103 #endif 104 105 /* unlike snprintf (which is required in C99), _snprintf does not guarantee 106 null termination of the result -- however this is only used in gzlib.c where 107 the result is assured to fit in the space provided */ 108 #if defined(_MSC_VER) && _MSC_VER < 1900 109 # define snprintf _snprintf 110 #endif 111 112 #ifndef local 113 # define local static 114 #endif 115 /* since "static" is used to mean two completely different things in C, we 116 define "local" for the non-static meaning of "static", for readability 117 (compile with -Dlocal if your debugger can't find static symbols) */ 118 119 /* gz* functions always use library allocation functions */ 120 #ifndef STDC 121 extern voidp malloc(uInt size); 122 extern void free(voidpf ptr); 123 #endif 124 125 /* get errno and strerror definition */ 126 #if defined UNDER_CE 127 # include <windows.h> 128 # define zstrerror() gz_strwinerror((DWORD)GetLastError()) 129 #else 130 # ifndef NO_STRERROR 131 # include <errno.h> 132 # define zstrerror() strerror(errno) 133 # else 134 # define zstrerror() "stdio error (consult errno)" 135 # endif 136 #endif 137 138 /* provide prototypes for these when building zlib without LFS */ 139 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 140 ZEXTERN gzFile ZEXPORT gzopen64(const char *, const char *); 141 ZEXTERN z_off64_t ZEXPORT gzseek64(gzFile, z_off64_t, int); 142 ZEXTERN z_off64_t ZEXPORT gztell64(gzFile); 143 ZEXTERN z_off64_t ZEXPORT gzoffset64(gzFile); 144 #endif 145 146 /* default memLevel */ 147 #if MAX_MEM_LEVEL >= 8 148 # define DEF_MEM_LEVEL 8 149 #else 150 # define DEF_MEM_LEVEL MAX_MEM_LEVEL 151 #endif 152 153 /* default i/o buffer size -- double this for output when reading (this and 154 twice this must be able to fit in an unsigned type) */ 155 #define GZBUFSIZE 8192 156 157 /* gzip modes, also provide a little integrity check on the passed structure */ 158 #define GZ_NONE 0 159 #define GZ_READ 7247 160 #define GZ_WRITE 31153 161 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 162 163 /* values for gz_state how */ 164 #define LOOK 0 /* look for a gzip header */ 165 #define COPY 1 /* copy input directly */ 166 #define GZIP 2 /* decompress a gzip stream */ 167 168 /* internal gzip file state data structure */ 169 typedef struct { 170 /* exposed contents for gzgetc() macro */ 171 struct gzFile_s x; /* "x" for exposed */ 172 /* x.have: number of bytes available at x.next */ 173 /* x.next: next output data to deliver or write */ 174 /* x.pos: current position in uncompressed data */ 175 /* used for both reading and writing */ 176 int mode; /* see gzip modes above */ 177 int fd; /* file descriptor */ 178 char *path; /* path or fd for error messages */ 179 unsigned size; /* buffer size, zero if not allocated yet */ 180 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 181 unsigned char *in; /* input buffer (double-sized when writing) */ 182 unsigned char *out; /* output buffer (double-sized when reading) */ 183 int direct; /* 0 if processing gzip, 1 if transparent */ 184 /* just for reading */ 185 int how; /* 0: get header, 1: copy, 2: decompress */ 186 z_off64_t start; /* where the gzip data started, for rewinding */ 187 int eof; /* true if end of input file reached */ 188 int past; /* true if read requested past end */ 189 /* just for writing */ 190 int level; /* compression level */ 191 int strategy; /* compression strategy */ 192 int reset; /* true if a reset is pending after a Z_FINISH */ 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(gz_statep, int, const char *); 206 #if defined UNDER_CE 207 char ZLIB_INTERNAL *gz_strwinerror(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(void); 217 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 218 #endif 219