1/* gzguts.h -- zlib internal header definitions for gz* operations 2 * Copyright (C) 2004, 2005, 2010, 2011, 2012 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#if ((__GNUC__-0) * 10 + __GNUC_MINOR__-0 >= 33) && !defined(NO_VIZ) 16# define ZLIB_INTERNAL __attribute__((visibility ("hidden"))) 17#else 18# define ZLIB_INTERNAL 19#endif 20 21#include "zlib.h" 22#include <stdio.h> 23#ifdef STDC 24# include <string.h> 25# include <stdlib.h> 26# include <limits.h> 27#endif 28#include <fcntl.h> 29 30#ifdef __TURBOC__ 31# include <io.h> 32#endif 33 34#ifdef NO_DEFLATE /* for compatibility with old definition */ 35# define NO_GZCOMPRESS 36#endif 37 38#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 39# ifndef HAVE_VSNPRINTF 40# define HAVE_VSNPRINTF 41# endif 42#endif 43 44#if defined(__CYGWIN__) 45# ifndef HAVE_VSNPRINTF 46# define HAVE_VSNPRINTF 47# endif 48#endif 49 50#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 51# ifndef HAVE_VSNPRINTF 52# define HAVE_VSNPRINTF 53# endif 54#endif 55 56#ifndef HAVE_VSNPRINTF 57# ifdef MSDOS 58/* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 59 but for now we just assume it doesn't. */ 60# define NO_vsnprintf 61# endif 62# ifdef __TURBOC__ 63# define NO_vsnprintf 64# endif 65# ifdef WIN32 66/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 67# if !defined(vsnprintf) && !defined(NO_vsnprintf) 68# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 69# include <io.h> 70# define vsnprintf _vsnprintf 71# endif 72# endif 73# endif 74# ifdef __SASC 75# define NO_vsnprintf 76# endif 77# ifdef VMS 78# define NO_vsnprintf 79# endif 80# ifdef __OS400__ 81# define NO_vsnprintf 82# endif 83# ifdef __MVS__ 84# define NO_vsnprintf 85# endif 86#endif 87 88#ifndef local 89# define local static 90#endif 91/* compile with -Dlocal if your debugger can't find static symbols */ 92 93/* gz* functions always use library allocation functions */ 94#ifndef STDC 95 extern voidp malloc OF((uInt size)); 96 extern void free OF((voidpf ptr)); 97#endif 98 99/* get errno and strerror definition */ 100#if defined UNDER_CE 101# include <windows.h> 102# define zstrerror() gz_strwinerror((DWORD)GetLastError()) 103#else 104# ifdef STDC 105# include <errno.h> 106# define zstrerror() strerror(errno) 107# else 108# define zstrerror() "stdio error (consult errno)" 109# endif 110#endif 111 112/* provide prototypes for these when building zlib without LFS */ 113#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 114 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 115 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 116 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 117 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 118#endif 119 120/* default memLevel */ 121#if MAX_MEM_LEVEL >= 8 122# define DEF_MEM_LEVEL 8 123#else 124# define DEF_MEM_LEVEL MAX_MEM_LEVEL 125#endif 126 127/* default i/o buffer size -- double this for output when reading */ 128#define GZBUFSIZE 8192 129 130/* gzip modes, also provide a little integrity check on the passed structure */ 131#define GZ_NONE 0 132#define GZ_READ 7247 133#define GZ_WRITE 31153 134#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 135 136/* values for gz_state how */ 137#define LOOK 0 /* look for a gzip header */ 138#define COPY 1 /* copy input directly */ 139#define GZIP 2 /* decompress a gzip stream */ 140 141/* internal gzip file state data structure */ 142typedef struct { 143 /* exposed contents for gzgetc() macro */ 144 struct gzFile_s x; /* "x" for exposed */ 145 /* x.have: number of bytes available at x.next */ 146 /* x.next: next output data to deliver or write */ 147 /* x.pos: current position in uncompressed data */ 148 /* used for both reading and writing */ 149 int mode; /* see gzip modes above */ 150 int fd; /* file descriptor */ 151 char *path; /* path or fd for error messages */ 152 unsigned size; /* buffer size, zero if not allocated yet */ 153 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 154 unsigned char *in; /* input buffer */ 155 unsigned char *out; /* output buffer (double-sized when reading) */ 156 int direct; /* 0 if processing gzip, 1 if transparent */ 157 /* just for reading */ 158 int how; /* 0: get header, 1: copy, 2: decompress */ 159 z_off64_t start; /* where the gzip data started, for rewinding */ 160 int eof; /* true if end of input file reached */ 161 int past; /* true if read requested past end */ 162 /* just for writing */ 163 int level; /* compression level */ 164 int strategy; /* compression strategy */ 165 /* seek request */ 166 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 167 int seek; /* true if seek request pending */ 168 /* error information */ 169 int err; /* error code */ 170 char *msg; /* error message */ 171 /* zlib inflate or deflate stream */ 172 z_stream strm; /* stream structure in-place (not a pointer) */ 173} gz_state; 174typedef gz_state FAR *gz_statep; 175 176/* shared functions */ 177void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 178#if defined UNDER_CE 179char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 180#endif 181 182/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 183 value -- needed when comparing unsigned to z_off64_t, which is signed 184 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 185#ifdef INT_MAX 186# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 187#else 188unsigned ZLIB_INTERNAL gz_intmax OF((void)); 189# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 190#endif 191