1205194Sdelphij/* gzguts.h -- zlib internal header definitions for gz* operations 2313796Sdelphij * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler 3205194Sdelphij * For conditions of distribution and use, see copyright notice in zlib.h 4205194Sdelphij */ 5205194Sdelphij 6206499Sdelphij#ifdef _LARGEFILE64_SOURCE 7205194Sdelphij# ifndef _LARGEFILE_SOURCE 8205990Sdelphij# define _LARGEFILE_SOURCE 1 9205194Sdelphij# endif 10205194Sdelphij# ifdef _FILE_OFFSET_BITS 11205194Sdelphij# undef _FILE_OFFSET_BITS 12205194Sdelphij# endif 13205194Sdelphij#endif 14205194Sdelphij 15237248Sdelphij#ifdef HAVE_HIDDEN 16206905Sdelphij# define ZLIB_INTERNAL __attribute__((visibility ("hidden"))) 17206905Sdelphij#else 18206905Sdelphij# define ZLIB_INTERNAL 19206905Sdelphij#endif 20205194Sdelphij 21205194Sdelphij#include <stdio.h> 22205194Sdelphij#include "zlib.h" 23205194Sdelphij#ifdef STDC 24205194Sdelphij# include <string.h> 25205194Sdelphij# include <stdlib.h> 26205194Sdelphij# include <limits.h> 27205194Sdelphij#endif 28313796Sdelphij 29313796Sdelphij#ifndef _POSIX_SOURCE 30313796Sdelphij# define _POSIX_SOURCE 31313796Sdelphij#endif 32205194Sdelphij#include <fcntl.h> 33205194Sdelphij 34237248Sdelphij#ifdef _WIN32 35237248Sdelphij# include <stddef.h> 36237248Sdelphij#endif 37237248Sdelphij 38237248Sdelphij#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) 39230837Sdelphij# include <io.h> 40230837Sdelphij#endif 41230837Sdelphij 42313796Sdelphij#if defined(_WIN32) || defined(__CYGWIN__) 43313796Sdelphij# define WIDECHAR 44313796Sdelphij#endif 45313796Sdelphij 46250224Sdelphij#ifdef WINAPI_FAMILY 47250224Sdelphij# define open _open 48250224Sdelphij# define read _read 49250224Sdelphij# define write _write 50250224Sdelphij# define close _close 51250224Sdelphij#endif 52250224Sdelphij 53205194Sdelphij#ifdef NO_DEFLATE /* for compatibility with old definition */ 54205194Sdelphij# define NO_GZCOMPRESS 55205194Sdelphij#endif 56205194Sdelphij 57230837Sdelphij#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 58230837Sdelphij# ifndef HAVE_VSNPRINTF 59230837Sdelphij# define HAVE_VSNPRINTF 60230837Sdelphij# endif 61205194Sdelphij#endif 62205194Sdelphij 63230837Sdelphij#if defined(__CYGWIN__) 64230837Sdelphij# ifndef HAVE_VSNPRINTF 65230837Sdelphij# define HAVE_VSNPRINTF 66230837Sdelphij# endif 67230837Sdelphij#endif 68230837Sdelphij 69230837Sdelphij#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 70230837Sdelphij# ifndef HAVE_VSNPRINTF 71230837Sdelphij# define HAVE_VSNPRINTF 72230837Sdelphij# endif 73230837Sdelphij#endif 74230837Sdelphij 75230837Sdelphij#ifndef HAVE_VSNPRINTF 76230837Sdelphij# ifdef MSDOS 77230837Sdelphij/* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 78250224Sdelphij but for now we just assume it doesn't. */ 79230837Sdelphij# define NO_vsnprintf 80230837Sdelphij# endif 81230837Sdelphij# ifdef __TURBOC__ 82230837Sdelphij# define NO_vsnprintf 83230837Sdelphij# endif 84230837Sdelphij# ifdef WIN32 85230837Sdelphij/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 86230837Sdelphij# if !defined(vsnprintf) && !defined(NO_vsnprintf) 87230837Sdelphij# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 88230837Sdelphij# define vsnprintf _vsnprintf 89230837Sdelphij# endif 90230837Sdelphij# endif 91230837Sdelphij# endif 92230837Sdelphij# ifdef __SASC 93230837Sdelphij# define NO_vsnprintf 94230837Sdelphij# endif 95230837Sdelphij# ifdef VMS 96230837Sdelphij# define NO_vsnprintf 97230837Sdelphij# endif 98230837Sdelphij# ifdef __OS400__ 99230837Sdelphij# define NO_vsnprintf 100230837Sdelphij# endif 101230837Sdelphij# ifdef __MVS__ 102230837Sdelphij# define NO_vsnprintf 103230837Sdelphij# endif 104230837Sdelphij#endif 105230837Sdelphij 106313796Sdelphij/* unlike snprintf (which is required in C99), _snprintf does not guarantee 107313796Sdelphij null termination of the result -- however this is only used in gzlib.c where 108250224Sdelphij the result is assured to fit in the space provided */ 109313796Sdelphij#if defined(_MSC_VER) && _MSC_VER < 1900 110250224Sdelphij# define snprintf _snprintf 111250224Sdelphij#endif 112250224Sdelphij 113205194Sdelphij#ifndef local 114205194Sdelphij# define local static 115205194Sdelphij#endif 116313796Sdelphij/* since "static" is used to mean two completely different things in C, we 117313796Sdelphij define "local" for the non-static meaning of "static", for readability 118313796Sdelphij (compile with -Dlocal if your debugger can't find static symbols) */ 119205194Sdelphij 120205194Sdelphij/* gz* functions always use library allocation functions */ 121205194Sdelphij#ifndef STDC 122205194Sdelphij extern voidp malloc OF((uInt size)); 123205194Sdelphij extern void free OF((voidpf ptr)); 124205194Sdelphij#endif 125205194Sdelphij 126205194Sdelphij/* get errno and strerror definition */ 127205990Sdelphij#if defined UNDER_CE 128205194Sdelphij# include <windows.h> 129205194Sdelphij# define zstrerror() gz_strwinerror((DWORD)GetLastError()) 130205194Sdelphij#else 131237248Sdelphij# ifndef NO_STRERROR 132205194Sdelphij# include <errno.h> 133205194Sdelphij# define zstrerror() strerror(errno) 134205194Sdelphij# else 135205194Sdelphij# define zstrerror() "stdio error (consult errno)" 136205194Sdelphij# endif 137205194Sdelphij#endif 138205194Sdelphij 139206499Sdelphij/* provide prototypes for these when building zlib without LFS */ 140206499Sdelphij#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 141206499Sdelphij ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 142206499Sdelphij ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 143206499Sdelphij ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 144206499Sdelphij ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 145205194Sdelphij#endif 146205194Sdelphij 147230837Sdelphij/* default memLevel */ 148230837Sdelphij#if MAX_MEM_LEVEL >= 8 149230837Sdelphij# define DEF_MEM_LEVEL 8 150230837Sdelphij#else 151230837Sdelphij# define DEF_MEM_LEVEL MAX_MEM_LEVEL 152230837Sdelphij#endif 153230837Sdelphij 154250224Sdelphij/* default i/o buffer size -- double this for output when reading (this and 155250224Sdelphij twice this must be able to fit in an unsigned type) */ 156205194Sdelphij#define GZBUFSIZE 8192 157205194Sdelphij 158205194Sdelphij/* gzip modes, also provide a little integrity check on the passed structure */ 159205194Sdelphij#define GZ_NONE 0 160205194Sdelphij#define GZ_READ 7247 161205194Sdelphij#define GZ_WRITE 31153 162205194Sdelphij#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 163205194Sdelphij 164205194Sdelphij/* values for gz_state how */ 165205194Sdelphij#define LOOK 0 /* look for a gzip header */ 166205194Sdelphij#define COPY 1 /* copy input directly */ 167205194Sdelphij#define GZIP 2 /* decompress a gzip stream */ 168205194Sdelphij 169205194Sdelphij/* internal gzip file state data structure */ 170205194Sdelphijtypedef struct { 171230837Sdelphij /* exposed contents for gzgetc() macro */ 172230837Sdelphij struct gzFile_s x; /* "x" for exposed */ 173230837Sdelphij /* x.have: number of bytes available at x.next */ 174230837Sdelphij /* x.next: next output data to deliver or write */ 175230837Sdelphij /* x.pos: current position in uncompressed data */ 176205194Sdelphij /* used for both reading and writing */ 177205194Sdelphij int mode; /* see gzip modes above */ 178205194Sdelphij int fd; /* file descriptor */ 179205194Sdelphij char *path; /* path or fd for error messages */ 180205194Sdelphij unsigned size; /* buffer size, zero if not allocated yet */ 181205194Sdelphij unsigned want; /* requested buffer size, default is GZBUFSIZE */ 182313796Sdelphij unsigned char *in; /* input buffer (double-sized when writing) */ 183205194Sdelphij unsigned char *out; /* output buffer (double-sized when reading) */ 184230837Sdelphij int direct; /* 0 if processing gzip, 1 if transparent */ 185205194Sdelphij /* just for reading */ 186230837Sdelphij int how; /* 0: get header, 1: copy, 2: decompress */ 187230837Sdelphij z_off64_t start; /* where the gzip data started, for rewinding */ 188205194Sdelphij int eof; /* true if end of input file reached */ 189230837Sdelphij int past; /* true if read requested past end */ 190205194Sdelphij /* just for writing */ 191205194Sdelphij int level; /* compression level */ 192205194Sdelphij int strategy; /* compression strategy */ 193205194Sdelphij /* seek request */ 194205194Sdelphij z_off64_t skip; /* amount to skip (already rewound if backwards) */ 195205194Sdelphij int seek; /* true if seek request pending */ 196205194Sdelphij /* error information */ 197205194Sdelphij int err; /* error code */ 198205194Sdelphij char *msg; /* error message */ 199205194Sdelphij /* zlib inflate or deflate stream */ 200205194Sdelphij z_stream strm; /* stream structure in-place (not a pointer) */ 201205194Sdelphij} gz_state; 202205194Sdelphijtypedef gz_state FAR *gz_statep; 203205194Sdelphij 204205194Sdelphij/* shared functions */ 205206905Sdelphijvoid ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 206205990Sdelphij#if defined UNDER_CE 207206905Sdelphijchar ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 208205194Sdelphij#endif 209205194Sdelphij 210205194Sdelphij/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 211205194Sdelphij value -- needed when comparing unsigned to z_off64_t, which is signed 212205194Sdelphij (possible z_off64_t types off_t, off64_t, and long are all signed) */ 213205194Sdelphij#ifdef INT_MAX 214205194Sdelphij# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 215205194Sdelphij#else 216206905Sdelphijunsigned ZLIB_INTERNAL gz_intmax OF((void)); 217205194Sdelphij# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 218205194Sdelphij#endif 219