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