1/* gzguts.h -- zlib internal header definitions for gz* operations 2 * Copyright (c) 2015, Daryl McDaniel. All rights reserved.<BR> 3 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler 4 * For conditions of distribution and use, see copyright notice in zlib.h 5 */ 6 7#ifdef _LARGEFILE64_SOURCE 8# ifndef _LARGEFILE_SOURCE 9# define _LARGEFILE_SOURCE 1 10# endif 11# ifdef _FILE_OFFSET_BITS 12# undef _FILE_OFFSET_BITS 13# endif 14#endif 15 16#ifdef HAVE_HIDDEN 17# define ZLIB_INTERNAL __attribute__((visibility ("hidden"))) 18#else 19# define ZLIB_INTERNAL 20#endif 21 22#include <stdio.h> 23#include "zlib.h" 24#ifdef STDC 25# include <string.h> 26# include <stdlib.h> 27# include <limits.h> 28#endif 29#include <fcntl.h> 30 31#ifdef _WIN32 32# include <stddef.h> 33#endif 34 35#if (defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)) && !defined(UEFI_C_SOURCE) 36# include <io.h> 37#endif 38 39#ifdef WINAPI_FAMILY 40# define open _open 41# define read _read 42# define write _write 43# define close _close 44#endif 45 46// Needed to get the declarations for open, read, write, close 47#ifdef UEFI_C_SOURCE 48# include <unistd.h> 49#endif 50 51#ifdef NO_DEFLATE /* for compatibility with old definition */ 52# define NO_GZCOMPRESS 53#endif 54 55#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 56# ifndef HAVE_VSNPRINTF 57# define HAVE_VSNPRINTF 58# endif 59#endif 60 61#if defined(__CYGWIN__) 62# ifndef HAVE_VSNPRINTF 63# define HAVE_VSNPRINTF 64# endif 65#endif 66 67#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 68# ifndef HAVE_VSNPRINTF 69# define HAVE_VSNPRINTF 70# endif 71#endif 72 73#ifndef HAVE_VSNPRINTF 74# ifdef MSDOS 75/* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 76 but for now we just assume it doesn't. */ 77# define NO_vsnprintf 78# endif 79# ifdef __TURBOC__ 80# define NO_vsnprintf 81# endif 82# ifdef WIN32 83/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 84# if !defined(vsnprintf) && !defined(NO_vsnprintf) 85# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 86# define vsnprintf _vsnprintf 87# endif 88# endif 89# endif 90# ifdef __SASC 91# define NO_vsnprintf 92# endif 93# ifdef VMS 94# define NO_vsnprintf 95# endif 96# ifdef __OS400__ 97# define NO_vsnprintf 98# endif 99# ifdef __MVS__ 100# define NO_vsnprintf 101# endif 102#endif 103 104/* unlike snprintf (which is required in C99, yet still not supported by 105 Microsoft more than a decade later!), _snprintf does not guarantee null 106 termination of the result -- however this is only used in gzlib.c where 107 the result is assured to fit in the space provided */ 108#if defined(_MSC_VER) && !defined(UEFI_C_SOURCE) 109# define snprintf _snprintf 110#endif 111 112#ifndef local 113# define local static 114#endif 115/* compile with -Dlocal if your debugger can't find static symbols */ 116 117/* gz* functions always use library allocation functions */ 118#ifndef STDC 119 extern voidp malloc OF((uInt size)); 120 extern void free OF((voidpf ptr)); 121#endif 122 123/* get errno and strerror definition */ 124#if defined UNDER_CE 125# include <windows.h> 126# define zstrerror() gz_strwinerror((DWORD)GetLastError()) 127#else 128# ifndef NO_STRERROR 129# include <errno.h> 130# define zstrerror() strerror(errno) 131# else 132# define zstrerror() "stdio error (consult errno)" 133# endif 134#endif 135 136/* provide prototypes for these when building zlib without LFS */ 137#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 138 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 139 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 140 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 141 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 142#endif 143 144/* default memLevel */ 145#if MAX_MEM_LEVEL >= 8 146# define DEF_MEM_LEVEL 8 147#else 148# define DEF_MEM_LEVEL MAX_MEM_LEVEL 149#endif 150 151/* default i/o buffer size -- double this for output when reading (this and 152 twice this must be able to fit in an unsigned type) */ 153#define GZBUFSIZE 8192 154 155/* gzip modes, also provide a little integrity check on the passed structure */ 156#define GZ_NONE 0 157#define GZ_READ 7247 158#define GZ_WRITE 31153 159#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 160 161/* values for gz_state how */ 162#define LOOK 0 /* look for a gzip header */ 163#define COPY 1 /* copy input directly */ 164#define GZIP 2 /* decompress a gzip stream */ 165 166/* internal gzip file state data structure */ 167typedef struct { 168 /* exposed contents for gzgetc() macro */ 169 struct gzFile_s x; /* "x" for exposed */ 170 /* x.have: number of bytes available at x.next */ 171 /* x.next: next output data to deliver or write */ 172 /* x.pos: current position in uncompressed data */ 173 /* used for both reading and writing */ 174 int mode; /* see gzip modes above */ 175 int fd; /* file descriptor */ 176 char *path; /* path or fd for error messages */ 177 unsigned size; /* buffer size, zero if not allocated yet */ 178 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 179 unsigned char *in; /* input buffer */ 180 unsigned char *out; /* output buffer (double-sized when reading) */ 181 int direct; /* 0 if processing gzip, 1 if transparent */ 182 /* just for reading */ 183 int how; /* 0: get header, 1: copy, 2: decompress */ 184 z_off64_t start; /* where the gzip data started, for rewinding */ 185 int eof; /* true if end of input file reached */ 186 int past; /* true if read requested past end */ 187 /* just for writing */ 188 int level; /* compression level */ 189 int strategy; /* compression strategy */ 190 /* seek request */ 191 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 192 int seek; /* true if seek request pending */ 193 /* error information */ 194 int err; /* error code */ 195 char *msg; /* error message */ 196 /* zlib inflate or deflate stream */ 197 z_stream strm; /* stream structure in-place (not a pointer) */ 198} gz_state; 199typedef gz_state FAR *gz_statep; 200 201/* shared functions */ 202void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 203#if defined UNDER_CE 204char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 205#endif 206 207/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 208 value -- needed when comparing unsigned to z_off64_t, which is signed 209 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 210#ifdef INT_MAX 211# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 212#else 213unsigned ZLIB_INTERNAL gz_intmax OF((void)); 214# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 215#endif 216