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