/src/zlib/gzguts.h
C++ Header | 211 lines | 153 code | 23 blank | 35 comment | 17 complexity | 637abd1375f0440c3a211a0c3b8671ba MD5 | raw file
1/* gzguts.h -- zlib internal header definitions for gz* operations 2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 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#else 33# include <unistd.h> 34#endif 35 36#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) 37# include <io.h> 38#endif 39 40#ifdef WINAPI_FAMILY 41# define open _open 42# define read _read 43# define write _write 44# define close _close 45#endif 46 47#ifdef NO_DEFLATE /* for compatibility with old definition */ 48# define NO_GZCOMPRESS 49#endif 50 51#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 52# ifndef HAVE_VSNPRINTF 53# define HAVE_VSNPRINTF 54# endif 55#endif 56 57#if defined(__CYGWIN__) 58# ifndef HAVE_VSNPRINTF 59# define HAVE_VSNPRINTF 60# endif 61#endif 62 63#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 64# ifndef HAVE_VSNPRINTF 65# define HAVE_VSNPRINTF 66# endif 67#endif 68 69#ifndef HAVE_VSNPRINTF 70# ifdef MSDOS 71/* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 72 but for now we just assume it doesn't. */ 73# define NO_vsnprintf 74# endif 75# ifdef __TURBOC__ 76# define NO_vsnprintf 77# endif 78# ifdef WIN32 79/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 80# if !defined(vsnprintf) && !defined(NO_vsnprintf) 81# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 82# define vsnprintf _vsnprintf 83# endif 84# endif 85# endif 86# ifdef __SASC 87# define NO_vsnprintf 88# endif 89# ifdef VMS 90# define NO_vsnprintf 91# endif 92# ifdef __OS400__ 93# define NO_vsnprintf 94# endif 95# ifdef __MVS__ 96# define NO_vsnprintf 97# endif 98#endif 99 100/* unlike snprintf (which is required in C99, yet still not supported by 101 Microsoft more than a decade later!), _snprintf does not guarantee null 102 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#ifdef _MSC_VER 105# define snprintf _snprintf 106#endif 107 108#ifndef local 109# define local static 110#endif 111/* compile with -Dlocal if your debugger can't find static symbols */ 112 113/* gz* functions always use library allocation functions */ 114#ifndef STDC 115 extern voidp malloc OF((uInt size)); 116 extern void free OF((voidpf ptr)); 117#endif 118 119/* get errno and strerror definition */ 120#if defined UNDER_CE 121# include <windows.h> 122# define zstrerror() gz_strwinerror((DWORD)GetLastError()) 123#else 124# ifndef NO_STRERROR 125# include <errno.h> 126# define zstrerror() strerror(errno) 127# else 128# define zstrerror() "stdio error (consult errno)" 129# endif 130#endif 131 132/* provide prototypes for these when building zlib without LFS */ 133#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 134 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 135 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 136 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 137 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 138#endif 139 140/* default memLevel */ 141#if MAX_MEM_LEVEL >= 8 142# define DEF_MEM_LEVEL 8 143#else 144# define DEF_MEM_LEVEL MAX_MEM_LEVEL 145#endif 146 147/* default i/o buffer size -- double this for output when reading (this and 148 twice this must be able to fit in an unsigned type) */ 149#define GZBUFSIZE 8192 150 151/* gzip modes, also provide a little integrity check on the passed structure */ 152#define GZ_NONE 0 153#define GZ_READ 7247 154#define GZ_WRITE 31153 155#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 156 157/* values for gz_state how */ 158#define LOOK 0 /* look for a gzip header */ 159#define COPY 1 /* copy input directly */ 160#define GZIP 2 /* decompress a gzip stream */ 161 162/* internal gzip file state data structure */ 163typedef struct { 164 /* exposed contents for gzgetc() macro */ 165 struct gzFile_s x; /* "x" for exposed */ 166 /* x.have: number of bytes available at x.next */ 167 /* x.next: next output data to deliver or write */ 168 /* x.pos: current position in uncompressed data */ 169 /* used for both reading and writing */ 170 int mode; /* see gzip modes above */ 171 int fd; /* file descriptor */ 172 char *path; /* path or fd for error messages */ 173 unsigned size; /* buffer size, zero if not allocated yet */ 174 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 175 unsigned char *in; /* input buffer */ 176 unsigned char *out; /* output buffer (double-sized when reading) */ 177 int direct; /* 0 if processing gzip, 1 if transparent */ 178 /* just for reading */ 179 int how; /* 0: get header, 1: copy, 2: decompress */ 180 z_off64_t start; /* where the gzip data started, for rewinding */ 181 int eof; /* true if end of input file reached */ 182 int past; /* true if read requested past end */ 183 /* just for writing */ 184 int level; /* compression level */ 185 int strategy; /* compression strategy */ 186 /* seek request */ 187 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 188 int seek; /* true if seek request pending */ 189 /* error information */ 190 int err; /* error code */ 191 char *msg; /* error message */ 192 /* zlib inflate or deflate stream */ 193 z_stream strm; /* stream structure in-place (not a pointer) */ 194} gz_state; 195typedef gz_state FAR *gz_statep; 196 197/* shared functions */ 198void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 199#if defined UNDER_CE 200char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 201#endif 202 203/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 204 value -- needed when comparing unsigned to z_off64_t, which is signed 205 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 206#ifdef INT_MAX 207# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 208#else 209unsigned ZLIB_INTERNAL gz_intmax OF((void)); 210# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 211#endif