1/* gzguts.h contains minimal changes required to be compiled with zlibWrapper: 2 * - #include "zlib.h" was changed to #include "zstd_zlibwrapper.h" 3 * - gz_statep was converted to union to work with -Wstrict-aliasing=1 */ 4 5/* gzguts.h -- zlib internal header definitions for gz* operations 6 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler 7 * For conditions of distribution and use, see http://www.zlib.net/zlib_license.html 8 */ 9 10#ifdef _LARGEFILE64_SOURCE 11# ifndef _LARGEFILE_SOURCE 12# define _LARGEFILE_SOURCE 1 13# endif 14# ifdef _FILE_OFFSET_BITS 15# undef _FILE_OFFSET_BITS 16# endif 17#endif 18 19#ifdef HAVE_HIDDEN 20# define ZLIB_INTERNAL __attribute__((visibility ("hidden"))) 21#else 22# define ZLIB_INTERNAL 23#endif 24 25#include <stdio.h> 26#include "zstd_zlibwrapper.h" 27#include "gzcompatibility.h" 28#ifdef STDC 29# include <string.h> 30# include <stdlib.h> 31# include <limits.h> 32#endif 33 34#ifndef _POSIX_SOURCE 35# define _POSIX_SOURCE 36#endif 37#include <fcntl.h> 38 39#ifdef _WIN32 40# include <stddef.h> 41#endif 42 43#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) 44# include <io.h> 45#endif 46 47#if defined(_WIN32) || defined(__CYGWIN__) 48# define WIDECHAR 49#endif 50 51#ifdef WINAPI_FAMILY 52# define open _open 53# define read _read 54# define write _write 55# define close _close 56#endif 57 58#ifdef NO_DEFLATE /* for compatibility with old definition */ 59# define NO_GZCOMPRESS 60#endif 61 62#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 63# ifndef HAVE_VSNPRINTF 64# define HAVE_VSNPRINTF 65# endif 66#endif 67 68#if defined(__CYGWIN__) 69# ifndef HAVE_VSNPRINTF 70# define HAVE_VSNPRINTF 71# endif 72#endif 73 74#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 75# ifndef HAVE_VSNPRINTF 76# define HAVE_VSNPRINTF 77# endif 78#endif 79 80#ifndef HAVE_VSNPRINTF 81# ifdef MSDOS 82/* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 83 but for now we just assume it doesn't. */ 84# define NO_vsnprintf 85# endif 86# ifdef __TURBOC__ 87# define NO_vsnprintf 88# endif 89# ifdef WIN32 90/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 91# if !defined(vsnprintf) && !defined(NO_vsnprintf) 92# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 93# define vsnprintf _vsnprintf 94# endif 95# endif 96# endif 97# ifdef __SASC 98# define NO_vsnprintf 99# endif 100# ifdef VMS 101# define NO_vsnprintf 102# endif 103# ifdef __OS400__ 104# define NO_vsnprintf 105# endif 106# ifdef __MVS__ 107# define NO_vsnprintf 108# endif 109#endif 110 111/* unlike snprintf (which is required in C99), _snprintf does not guarantee 112 null termination of the result -- however this is only used in gzlib.c where 113 the result is assured to fit in the space provided */ 114#if defined(_MSC_VER) && _MSC_VER < 1900 115# define snprintf _snprintf 116#endif 117 118#ifndef local 119# define local static 120#endif 121/* since "static" is used to mean two completely different things in C, we 122 define "local" for the non-static meaning of "static", for readability 123 (compile with -Dlocal if your debugger can't find static symbols) */ 124 125/* gz* functions always use library allocation functions */ 126#ifndef STDC 127 extern voidp malloc OF((uInt size)); 128 extern void free OF((voidpf ptr)); 129#endif 130 131/* get errno and strerror definition */ 132#if defined UNDER_CE 133# include <windows.h> 134# define zstrerror() gz_strwinerror((DWORD)GetLastError()) 135#else 136# ifndef NO_STRERROR 137# include <errno.h> 138# define zstrerror() strerror(errno) 139# else 140# define zstrerror() "stdio error (consult errno)" 141# endif 142#endif 143 144/* provide prototypes for these when building zlib without LFS */ 145#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 146 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 147 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 148 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 149 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 150#endif 151 152/* default memLevel */ 153#if MAX_MEM_LEVEL >= 8 154# define DEF_MEM_LEVEL 8 155#else 156# define DEF_MEM_LEVEL MAX_MEM_LEVEL 157#endif 158 159/* default i/o buffer size -- double this for output when reading (this and 160 twice this must be able to fit in an unsigned type) */ 161#define GZBUFSIZE 8192 162 163/* gzip modes, also provide a little integrity check on the passed structure */ 164#define GZ_NONE 0 165#define GZ_READ 7247 166#define GZ_WRITE 31153 167#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 168 169/* values for gz_state how */ 170#define LOOK 0 /* look for a gzip header */ 171#define COPY 1 /* copy input directly */ 172#define GZIP 2 /* decompress a gzip stream */ 173 174/* internal gzip file state data structure */ 175typedef struct { 176 /* exposed contents for gzgetc() macro */ 177 struct gzFile_s x; /* "x" for exposed */ 178 /* x.have: number of bytes available at x.next */ 179 /* x.next: next output data to deliver or write */ 180 /* x.pos: current position in uncompressed data */ 181 /* used for both reading and writing */ 182 int mode; /* see gzip modes above */ 183 int fd; /* file descriptor */ 184 char *path; /* path or fd for error messages */ 185 unsigned size; /* buffer size, zero if not allocated yet */ 186 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 187 unsigned char *in; /* input buffer (double-sized when writing) */ 188 unsigned char *out; /* output buffer (double-sized when reading) */ 189 int direct; /* 0 if processing gzip, 1 if transparent */ 190 /* just for reading */ 191 int how; /* 0: get header, 1: copy, 2: decompress */ 192 z_off64_t start; /* where the gzip data started, for rewinding */ 193 int eof; /* true if end of input file reached */ 194 int past; /* true if read requested past end */ 195 /* just for writing */ 196 int level; /* compression level */ 197 int strategy; /* compression strategy */ 198 /* seek request */ 199 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 200 int seek; /* true if seek request pending */ 201 /* error information */ 202 int err; /* error code */ 203 char *msg; /* error message */ 204 /* zlib inflate or deflate stream */ 205 z_stream strm; /* stream structure in-place (not a pointer) */ 206} gz_state; 207 208typedef union { 209 gz_state FAR *state; 210 gzFile file; 211} gz_statep; 212 213/* shared functions */ 214void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 215#if defined UNDER_CE 216char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 217#endif 218 219/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 220 value -- needed when comparing unsigned to z_off64_t, which is signed 221 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 222#ifdef INT_MAX 223# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 224#else 225unsigned ZLIB_INTERNAL gz_intmax OF((void)); 226# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 227#endif 228