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#else 42# include <unistd.h> 43#endif 44 45#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) 46# include <io.h> 47#endif 48 49#if defined(_WIN32) 50# define WIDECHAR 51#endif 52 53#ifdef WINAPI_FAMILY 54# define open _open 55# define read _read 56# define write _write 57# define close _close 58#endif 59 60#ifdef NO_DEFLATE /* for compatibility with old definition */ 61# define NO_GZCOMPRESS 62#endif 63 64#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 65# ifndef HAVE_VSNPRINTF 66# define HAVE_VSNPRINTF 67# endif 68#endif 69 70#if defined(__CYGWIN__) 71# ifndef HAVE_VSNPRINTF 72# define HAVE_VSNPRINTF 73# endif 74#endif 75 76#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 77# ifndef HAVE_VSNPRINTF 78# define HAVE_VSNPRINTF 79# endif 80#endif 81 82#ifndef HAVE_VSNPRINTF 83# ifdef MSDOS 84/* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 85 but for now we just assume it doesn't. */ 86# define NO_vsnprintf 87# endif 88# ifdef __TURBOC__ 89# define NO_vsnprintf 90# endif 91# ifdef WIN32 92/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 93# if !defined(vsnprintf) && !defined(NO_vsnprintf) 94# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 95# define vsnprintf _vsnprintf 96# endif 97# endif 98# endif 99# ifdef __SASC 100# define NO_vsnprintf 101# endif 102# ifdef VMS 103# define NO_vsnprintf 104# endif 105# ifdef __OS400__ 106# define NO_vsnprintf 107# endif 108# ifdef __MVS__ 109# define NO_vsnprintf 110# endif 111#endif 112 113/* unlike snprintf (which is required in C99), _snprintf does not guarantee 114 null termination of the result -- however this is only used in gzlib.c where 115 the result is assured to fit in the space provided */ 116#if defined(_MSC_VER) && _MSC_VER < 1900 117# define snprintf _snprintf 118#endif 119 120#ifndef local 121# define local static 122#endif 123/* since "static" is used to mean two completely different things in C, we 124 define "local" for the non-static meaning of "static", for readability 125 (compile with -Dlocal if your debugger can't find static symbols) */ 126 127/* gz* functions always use library allocation functions */ 128#ifndef STDC 129 extern voidp malloc OF((uInt size)); 130 extern void free OF((voidpf ptr)); 131#endif 132 133/* get errno and strerror definition */ 134#if defined UNDER_CE 135# include <windows.h> 136# define zstrerror() gz_strwinerror((DWORD)GetLastError()) 137#else 138# ifndef NO_STRERROR 139# include <errno.h> 140# define zstrerror() strerror(errno) 141# else 142# define zstrerror() "stdio error (consult errno)" 143# endif 144#endif 145 146/* provide prototypes for these when building zlib without LFS */ 147#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 148 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 149 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 150 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 151 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 152#endif 153 154/* default memLevel */ 155#if MAX_MEM_LEVEL >= 8 156# define DEF_MEM_LEVEL 8 157#else 158# define DEF_MEM_LEVEL MAX_MEM_LEVEL 159#endif 160 161/* default i/o buffer size -- double this for output when reading (this and 162 twice this must be able to fit in an unsigned type) */ 163#define GZBUFSIZE 8192 164 165/* gzip modes, also provide a little integrity check on the passed structure */ 166#define GZ_NONE 0 167#define GZ_READ 7247 168#define GZ_WRITE 31153 169#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 170 171/* values for gz_state how */ 172#define LOOK 0 /* look for a gzip header */ 173#define COPY 1 /* copy input directly */ 174#define GZIP 2 /* decompress a gzip stream */ 175 176/* internal gzip file state data structure */ 177typedef struct { 178 /* exposed contents for gzgetc() macro */ 179 struct gzFile_s x; /* "x" for exposed */ 180 /* x.have: number of bytes available at x.next */ 181 /* x.next: next output data to deliver or write */ 182 /* x.pos: current position in uncompressed data */ 183 /* used for both reading and writing */ 184 int mode; /* see gzip modes above */ 185 int fd; /* file descriptor */ 186 char *path; /* path or fd for error messages */ 187 unsigned size; /* buffer size, zero if not allocated yet */ 188 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 189 unsigned char *in; /* input buffer (double-sized when writing) */ 190 unsigned char *out; /* output buffer (double-sized when reading) */ 191 int direct; /* 0 if processing gzip, 1 if transparent */ 192 /* just for reading */ 193 int how; /* 0: get header, 1: copy, 2: decompress */ 194 z_off64_t start; /* where the gzip data started, for rewinding */ 195 int eof; /* true if end of input file reached */ 196 int past; /* true if read requested past end */ 197 /* just for writing */ 198 int level; /* compression level */ 199 int strategy; /* compression strategy */ 200 /* seek request */ 201 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 202 int seek; /* true if seek request pending */ 203 /* error information */ 204 int err; /* error code */ 205 char *msg; /* error message */ 206 /* zlib inflate or deflate stream */ 207 z_stream strm; /* stream structure in-place (not a pointer) */ 208} gz_state; 209 210typedef union { 211 gz_state FAR *state; 212 gzFile file; 213} gz_statep; 214 215/* shared functions */ 216void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 217#if defined UNDER_CE 218char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 219#endif 220 221/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 222 value -- needed when comparing unsigned to z_off64_t, which is signed 223 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 224#ifdef INT_MAX 225# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 226#else 227unsigned ZLIB_INTERNAL gz_intmax OF((void)); 228# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 229#endif 230