1/* gzguts.h -- zlib internal header definitions for gz* operations 2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 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 29#ifndef _POSIX_SOURCE 30# define _POSIX_SOURCE 31#endif 32#include <fcntl.h> 33 34#ifdef _WIN32 35# include <stddef.h> 36#endif 37 38#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) 39# include <io.h> 40#endif 41 42#if defined(_WIN32) || defined(__CYGWIN__) 43# define WIDECHAR 44#endif 45 46#ifdef WINAPI_FAMILY 47# define open _open 48# define read _read 49# define write _write 50# define close _close 51#endif 52 53#ifdef NO_DEFLATE /* for compatibility with old definition */ 54# define NO_GZCOMPRESS 55#endif 56 57#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 58# ifndef HAVE_VSNPRINTF 59# define HAVE_VSNPRINTF 60# endif 61#endif 62 63#if defined(__CYGWIN__) 64# ifndef HAVE_VSNPRINTF 65# define HAVE_VSNPRINTF 66# endif 67#endif 68 69#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 70# ifndef HAVE_VSNPRINTF 71# define HAVE_VSNPRINTF 72# endif 73#endif 74 75#ifndef HAVE_VSNPRINTF 76# ifdef MSDOS 77/* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 78 but for now we just assume it doesn't. */ 79# define NO_vsnprintf 80# endif 81# ifdef __TURBOC__ 82# define NO_vsnprintf 83# endif 84# ifdef WIN32 85/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 86# if !defined(vsnprintf) && !defined(NO_vsnprintf) 87# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 88# define vsnprintf _vsnprintf 89# endif 90# endif 91# endif 92# ifdef __SASC 93# define NO_vsnprintf 94# endif 95# ifdef VMS 96# define NO_vsnprintf 97# endif 98# ifdef __OS400__ 99# define NO_vsnprintf 100# endif 101# ifdef __MVS__ 102# define NO_vsnprintf 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 OF((uInt size)); 123 extern void free OF((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 OF((const char *, const char *)); 142 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 143 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 144 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((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 */ 170typedef 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 /* seek request */ 194 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 195 int seek; /* true if seek request pending */ 196 /* error information */ 197 int err; /* error code */ 198 char *msg; /* error message */ 199 /* zlib inflate or deflate stream */ 200 z_stream strm; /* stream structure in-place (not a pointer) */ 201} gz_state; 202typedef gz_state FAR *gz_statep; 203 204/* shared functions */ 205void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 206#if defined UNDER_CE 207char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 208#endif 209 210/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 211 value -- needed when comparing unsigned to z_off64_t, which is signed 212 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 213#ifdef INT_MAX 214# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 215#else 216unsigned ZLIB_INTERNAL gz_intmax OF((void)); 217# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 218#endif 219