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# ifdef _FILE_OFFSET_BITS 11# undef _FILE_OFFSET_BITS 12# endif 13#endif 14 15#ifdef HAVE_HIDDEN 16# define ZLIB_INTERNAL __attribute__((visibility ("hidden"))) 17#else 18# define ZLIB_INTERNAL 19#endif 20 21#include <stdio.h> 22#include "zlib.h" 23#ifdef STDC 24# include <unistd.h> 25# include <string.h> 26# include <stdlib.h> 27# include <limits.h> 28#endif 29 30#ifndef _POSIX_SOURCE 31# define _POSIX_SOURCE 32#endif 33#include <fcntl.h> 34 35#ifdef _WIN32 36# include <stddef.h> 37#endif 38 39#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) 40# include <io.h> 41#endif 42 43#if defined(_WIN32) 44# define WIDECHAR 45#endif 46 47#ifdef WINAPI_FAMILY 48# define open _open 49# define read _read 50# define write _write 51# define close _close 52#endif 53 54#ifdef NO_DEFLATE /* for compatibility with old definition */ 55# define NO_GZCOMPRESS 56#endif 57 58#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 59# ifndef HAVE_VSNPRINTF 60# define HAVE_VSNPRINTF 61# endif 62#endif 63 64#if defined(__CYGWIN__) 65# ifndef HAVE_VSNPRINTF 66# define HAVE_VSNPRINTF 67# endif 68#endif 69 70#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 71# ifndef HAVE_VSNPRINTF 72# define HAVE_VSNPRINTF 73# endif 74#endif 75 76#ifndef HAVE_VSNPRINTF 77# ifdef MSDOS 78/* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 79 but for now we just assume it doesn't. */ 80# define NO_vsnprintf 81# endif 82# ifdef __TURBOC__ 83# define NO_vsnprintf 84# endif 85# ifdef WIN32 86/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 87# if !defined(vsnprintf) && !defined(NO_vsnprintf) 88# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 89# define vsnprintf _vsnprintf 90# endif 91# endif 92# endif 93# ifdef __SASC 94# define NO_vsnprintf 95# endif 96# ifdef VMS 97# define NO_vsnprintf 98# endif 99# ifdef __OS400__ 100# define NO_vsnprintf 101# endif 102# ifdef __MVS__ 103# define NO_vsnprintf 104# endif 105#endif 106 107/* unlike snprintf (which is required in C99), _snprintf does not guarantee 108 null termination of the result -- however this is only used in gzlib.c where 109 the result is assured to fit in the space provided */ 110#if defined(_MSC_VER) && _MSC_VER < 1900 111# define snprintf _snprintf 112#endif 113 114#ifndef local 115# define local static 116#endif 117/* since "static" is used to mean two completely different things in C, we 118 define "local" for the non-static meaning of "static", for readability 119 (compile with -Dlocal if your debugger can't find static symbols) */ 120 121/* gz* functions always use library allocation functions */ 122#ifndef STDC 123 extern voidp malloc OF((uInt size)); 124 extern void free OF((voidpf ptr)); 125#endif 126 127/* get errno and strerror definition */ 128#if defined UNDER_CE 129# include <windows.h> 130# define zstrerror() gz_strwinerror((DWORD)GetLastError()) 131#else 132# ifndef NO_STRERROR 133# include <errno.h> 134# define zstrerror() strerror(errno) 135# else 136# define zstrerror() "stdio error (consult errno)" 137# endif 138#endif 139 140/* provide prototypes for these when building zlib without LFS */ 141#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 142 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 143 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 144 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 145 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 146#endif 147 148/* default memLevel */ 149#if MAX_MEM_LEVEL >= 8 150# define DEF_MEM_LEVEL 8 151#else 152# define DEF_MEM_LEVEL MAX_MEM_LEVEL 153#endif 154 155/* default i/o buffer size -- double this for output when reading (this and 156 twice this must be able to fit in an unsigned type) */ 157#define GZBUFSIZE 8192 158 159/* gzip modes, also provide a little integrity check on the passed structure */ 160#define GZ_NONE 0 161#define GZ_READ 7247 162#define GZ_WRITE 31153 163#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 164 165/* values for gz_state how */ 166#define LOOK 0 /* look for a gzip header */ 167#define COPY 1 /* copy input directly */ 168#define GZIP 2 /* decompress a gzip stream */ 169 170/* internal gzip file state data structure */ 171typedef struct { 172 /* exposed contents for gzgetc() macro */ 173 struct gzFile_s x; /* "x" for exposed */ 174 /* x.have: number of bytes available at x.next */ 175 /* x.next: next output data to deliver or write */ 176 /* x.pos: current position in uncompressed data */ 177 /* used for both reading and writing */ 178 int mode; /* see gzip modes above */ 179 int fd; /* file descriptor */ 180 char *path; /* path or fd for error messages */ 181 unsigned size; /* buffer size, zero if not allocated yet */ 182 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 183 unsigned char *in; /* input buffer (double-sized when writing) */ 184 unsigned char *out; /* output buffer (double-sized when reading) */ 185 int direct; /* 0 if processing gzip, 1 if transparent */ 186 /* just for reading */ 187 int how; /* 0: get header, 1: copy, 2: decompress */ 188 z_off64_t start; /* where the gzip data started, for rewinding */ 189 int eof; /* true if end of input file reached */ 190 int past; /* true if read requested past end */ 191 /* just for writing */ 192 int level; /* compression level */ 193 int strategy; /* compression strategy */ 194 int reset; /* true if a reset is pending after a Z_FINISH */ 195 /* seek request */ 196 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 197 int seek; /* true if seek request pending */ 198 /* error information */ 199 int err; /* error code */ 200 char *msg; /* error message */ 201 /* zlib inflate or deflate stream */ 202 z_stream strm; /* stream structure in-place (not a pointer) */ 203} gz_state; 204typedef gz_state FAR *gz_statep; 205 206/* shared functions */ 207void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 208#if defined UNDER_CE 209char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 210#endif 211 212/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 213 value -- needed when comparing unsigned to z_off64_t, which is signed 214 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 215#ifdef INT_MAX 216# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 217#else 218unsigned ZLIB_INTERNAL gz_intmax OF((void)); 219# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 220#endif 221