1 /* gzguts.h -- zlib internal header definitions for gz* operations 2 * Copyright (C) 2004-2024 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 #if defined(_WIN32) && !defined(_CRT_SECURE_NO_WARNINGS) 21 # define _CRT_SECURE_NO_WARNINGS 22 #endif 23 #if defined(_WIN32) && !defined(_CRT_NONSTDC_NO_DEPRECATE) 24 # define _CRT_NONSTDC_NO_DEPRECATE 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_C_SOURCE 36 # define _POSIX_C_SOURCE 200112L 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 # include <sys/stat.h> 47 #endif 48 49 #if defined(_WIN32) && !defined(WIDECHAR) 50 # define WIDECHAR 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 # if !defined(NO_vsnprintf) && \ 77 (defined(MSDOS) || defined(__TURBOC__) || defined(__SASC) || \ 78 defined(VMS) || defined(__OS400) || defined(__MVS__)) 79 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 80 but for now we just assume it doesn't. */ 81 # define NO_vsnprintf 82 # endif 83 # ifdef WIN32 84 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 85 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 86 # ifndef vsnprintf 87 # define vsnprintf _vsnprintf 88 # endif 89 # endif 90 # elif !defined(__STDC_VERSION__) || __STDC_VERSION__-0 < 199901L 91 /* Otherwise if C89/90, assume no C99 snprintf() or vsnprintf() */ 92 # ifndef NO_snprintf 93 # define NO_snprintf 94 # endif 95 # ifndef NO_vsnprintf 96 # define NO_vsnprintf 97 # endif 98 # endif 99 #endif 100 101 /* unlike snprintf (which is required in C99), _snprintf does not guarantee 102 null termination of the result -- however this is only used in gzlib.c where 103 the result is assured to fit in the space provided */ 104 #if defined(_MSC_VER) && _MSC_VER < 1900 105 # define snprintf _snprintf 106 #endif 107 108 #ifndef local 109 # define local static 110 #endif 111 /* since "static" is used to mean two completely different things in C, we 112 define "local" for the non-static meaning of "static", for readability 113 (compile with -Dlocal if your debugger can't find static symbols) */ 114 115 /* gz* functions always use library allocation functions */ 116 #ifndef STDC 117 extern voidp malloc(uInt size); 118 extern void free(voidpf ptr); 119 #endif 120 121 /* get errno and strerror definition */ 122 #if defined UNDER_CE 123 # include <windows.h> 124 # define zstrerror() gz_strwinerror((DWORD)GetLastError()) 125 #else 126 # ifndef NO_STRERROR 127 # include <errno.h> 128 # define zstrerror() strerror(errno) 129 # else 130 # define zstrerror() "stdio error (consult errno)" 131 # endif 132 #endif 133 134 /* provide prototypes for these when building zlib without LFS */ 135 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 136 ZEXTERN gzFile ZEXPORT gzopen64(const char *, const char *); 137 ZEXTERN z_off64_t ZEXPORT gzseek64(gzFile, z_off64_t, int); 138 ZEXTERN z_off64_t ZEXPORT gztell64(gzFile); 139 ZEXTERN z_off64_t ZEXPORT gzoffset64(gzFile); 140 #endif 141 142 /* default memLevel */ 143 #if MAX_MEM_LEVEL >= 8 144 # define DEF_MEM_LEVEL 8 145 #else 146 # define DEF_MEM_LEVEL MAX_MEM_LEVEL 147 #endif 148 149 /* default i/o buffer size -- double this for output when reading (this and 150 twice this must be able to fit in an unsigned type) */ 151 #define GZBUFSIZE 8192 152 153 /* gzip modes, also provide a little integrity check on the passed structure */ 154 #define GZ_NONE 0 155 #define GZ_READ 7247 156 #define GZ_WRITE 31153 157 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 158 159 /* values for gz_state how */ 160 #define LOOK 0 /* look for a gzip header */ 161 #define COPY 1 /* copy input directly */ 162 #define GZIP 2 /* decompress a gzip stream */ 163 164 /* internal gzip file state data structure */ 165 typedef struct { 166 /* exposed contents for gzgetc() macro */ 167 struct gzFile_s x; /* "x" for exposed */ 168 /* x.have: number of bytes available at x.next */ 169 /* x.next: next output data to deliver or write */ 170 /* x.pos: current position in uncompressed data */ 171 /* used for both reading and writing */ 172 int mode; /* see gzip modes above */ 173 int fd; /* file descriptor */ 174 char *path; /* path or fd for error messages */ 175 unsigned size; /* buffer size, zero if not allocated yet */ 176 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 177 unsigned char *in; /* input buffer (double-sized when writing) */ 178 unsigned char *out; /* output buffer (double-sized when reading) */ 179 int direct; /* 0 if processing gzip, 1 if transparent */ 180 /* just for reading */ 181 int how; /* 0: get header, 1: copy, 2: decompress */ 182 z_off64_t start; /* where the gzip data started, for rewinding */ 183 int eof; /* true if end of input file reached */ 184 int past; /* true if read requested past end */ 185 /* just for writing */ 186 int level; /* compression level */ 187 int strategy; /* compression strategy */ 188 int reset; /* true if a reset is pending after a Z_FINISH */ 189 /* seek request */ 190 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 191 int seek; /* true if seek request pending */ 192 /* error information */ 193 int err; /* error code */ 194 char *msg; /* error message */ 195 /* zlib inflate or deflate stream */ 196 z_stream strm; /* stream structure in-place (not a pointer) */ 197 } gz_state; 198 typedef gz_state FAR *gz_statep; 199 200 /* shared functions */ 201 void ZLIB_INTERNAL gz_error(gz_statep, int, const char *); 202 #if defined UNDER_CE 203 char ZLIB_INTERNAL *gz_strwinerror(DWORD error); 204 #endif 205 206 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 207 value -- needed when comparing unsigned to z_off64_t, which is signed 208 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 209 unsigned ZLIB_INTERNAL gz_intmax(void); 210 #define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 211