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) 21# ifndef WIN32_LEAN_AND_MEAN 22# define WIN32_LEAN_AND_MEAN 23# endif 24# ifndef _CRT_SECURE_NO_WARNINGS 25# define _CRT_SECURE_NO_WARNINGS 26# endif 27# ifndef _CRT_NONSTDC_NO_DEPRECATE 28# define _CRT_NONSTDC_NO_DEPRECATE 29# endif 30#endif 31 32#include <stdio.h> 33#include "zlib.h" 34#ifdef STDC 35# include <string.h> 36# include <stdlib.h> 37# include <limits.h> 38#endif 39 40#ifndef _POSIX_C_SOURCE 41# define _POSIX_C_SOURCE 200112L 42#endif 43#include <fcntl.h> 44 45#ifdef _WIN32 46# include <stddef.h> 47#endif 48 49#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) 50# include <io.h> 51# include <sys/stat.h> 52#endif 53 54#if defined(_WIN32) && !defined(WIDECHAR) 55# define WIDECHAR 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# if !defined(NO_vsnprintf) && \ 82 (defined(MSDOS) || defined(__TURBOC__) || defined(__SASC) || \ 83 defined(VMS) || defined(__OS400) || defined(__MVS__)) 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 WIN32 89 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 90# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 91# ifndef vsnprintf 92# define vsnprintf _vsnprintf 93# endif 94# endif 95# elif !defined(__STDC_VERSION__) || __STDC_VERSION__-0 < 199901L 96 /* Otherwise if C89/90, assume no C99 snprintf() or vsnprintf() */ 97# ifndef NO_snprintf 98# define NO_snprintf 99# endif 100# ifndef NO_vsnprintf 101# define NO_vsnprintf 102# endif 103# endif 104#endif 105 106 /* unlike snprintf (which is required in C99), _snprintf does not guarantee 107 null termination of the result -- however this is only used in gzlib.c where 108 the result is assured to fit in the space provided */ 109#if defined(_MSC_VER) && _MSC_VER < 1900 110# define snprintf _snprintf 111#endif 112 113#ifndef local 114# define local static 115#endif 116 /* since "static" is used to mean two completely different things in C, we 117 define "local" for the non-static meaning of "static", for readability 118 (compile with -Dlocal if your debugger can't find static symbols) */ 119 120 /* gz* functions always use library allocation functions */ 121#ifndef STDC 122 extern voidp malloc(uInt size); 123 extern void free(voidpf ptr); 124#endif 125 126 /* get errno and strerror definition */ 127#if defined UNDER_CE 128# include <windows.h> 129# define zstrerror() gz_strwinerror((DWORD)GetLastError()) 130#else 131# ifndef NO_STRERROR 132# include <errno.h> 133# define zstrerror() strerror(errno) 134# else 135# define zstrerror() "stdio error (consult errno)" 136# endif 137#endif 138 139 /* provide prototypes for these when building zlib without LFS */ 140#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 141 ZEXTERN gzFile ZEXPORT gzopen64(const char *, const char *); 142 ZEXTERN z_off64_t ZEXPORT gzseek64(gzFile, z_off64_t, int); 143 ZEXTERN z_off64_t ZEXPORT gztell64(gzFile); 144 ZEXTERN z_off64_t ZEXPORT gzoffset64(gzFile); 145#endif 146 147 /* default memLevel */ 148#if MAX_MEM_LEVEL >= 8 149# define DEF_MEM_LEVEL 8 150#else 151# define DEF_MEM_LEVEL MAX_MEM_LEVEL 152#endif 153 154 /* default i/o buffer size -- double this for output when reading (this and 155 twice this must be able to fit in an unsigned type) */ 156#define GZBUFSIZE 8192 157 158 /* gzip modes, also provide a little integrity check on the passed structure */ 159#define GZ_NONE 0 160#define GZ_READ 7247 161#define GZ_WRITE 31153 162#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 163 164 /* values for gz_state how */ 165#define LOOK 0 /* look for a gzip header */ 166#define COPY 1 /* copy input directly */ 167#define GZIP 2 /* decompress a gzip stream */ 168 169 /* internal gzip file state data structure */ 170 typedef struct { 171 /* exposed contents for gzgetc() macro */ 172 struct gzFile_s x; /* "x" for exposed */ 173 /* x.have: number of bytes available at x.next */ 174 /* x.next: next output data to deliver or write */ 175 /* x.pos: current position in uncompressed data */ 176 /* used for both reading and writing */ 177 int mode; /* see gzip modes above */ 178 int fd; /* file descriptor */ 179 char *path; /* path or fd for error messages */ 180 unsigned size; /* buffer size, zero if not allocated yet */ 181 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 182 unsigned char *in; /* input buffer (double-sized when writing) */ 183 unsigned char *out; /* output buffer (double-sized when reading) */ 184 int direct; /* 0 if processing gzip, 1 if transparent */ 185 /* just for reading */ 186 int how; /* 0: get header, 1: copy, 2: decompress */ 187 z_off64_t start; /* where the gzip data started, for rewinding */ 188 int eof; /* true if end of input file reached */ 189 int past; /* true if read requested past end */ 190 /* just for writing */ 191 int level; /* compression level */ 192 int strategy; /* compression strategy */ 193 int reset; /* true if a reset is pending after a Z_FINISH */ 194 /* seek request */ 195 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 196 int seek; /* true if seek request pending */ 197 /* error information */ 198 int err; /* error code */ 199 char *msg; /* error message */ 200 /* zlib inflate or deflate stream */ 201 z_stream strm; /* stream structure in-place (not a pointer) */ 202} gz_state; 203 typedef gz_state FAR *gz_statep; 204 205 /* shared functions */ 206 void ZLIB_INTERNAL gz_error(gz_statep, int, const char *); 207#if defined UNDER_CE 208 char ZLIB_INTERNAL *gz_strwinerror(DWORD error); 209#endif 210 211 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 212 value -- needed when comparing unsigned to z_off64_t, which is signed 213 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 214 unsigned ZLIB_INTERNAL gz_intmax(void); 215#define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 216