1 /* $OpenBSD: gzguts.h,v 1.2 2021/07/04 17:41:23 tb Exp $ */ 2 3 /* gzguts.h -- zlib internal header definitions for gz* operations 4 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler 5 * For conditions of distribution and use, see copyright notice in zlib.h 6 */ 7 8 #ifdef _LARGEFILE64_SOURCE 9 # ifndef _LARGEFILE_SOURCE 10 # define _LARGEFILE_SOURCE 1 11 # endif 12 # ifdef _FILE_OFFSET_BITS 13 # undef _FILE_OFFSET_BITS 14 # endif 15 #endif 16 17 #ifdef HAVE_HIDDEN 18 # define ZLIB_INTERNAL __attribute__((visibility ("hidden"))) 19 #else 20 # define ZLIB_INTERNAL 21 #endif 22 23 #include <stdio.h> 24 #include "zlib.h" 25 #ifdef STDC 26 # include <string.h> 27 # include <stdlib.h> 28 # include <limits.h> 29 #endif 30 31 #ifndef _POSIX_SOURCE 32 # define _POSIX_SOURCE 33 #endif 34 #include <fcntl.h> 35 36 #ifdef _WIN32 37 # include <stddef.h> 38 #endif 39 40 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32) 41 # include <io.h> 42 #endif 43 44 #if defined(_WIN32) || defined(__CYGWIN__) 45 # define WIDECHAR 46 #endif 47 48 #ifdef WINAPI_FAMILY 49 # define open _open 50 # define read _read 51 # define write _write 52 # define close _close 53 #endif 54 55 #ifdef NO_DEFLATE /* for compatibility with old definition */ 56 # define NO_GZCOMPRESS 57 #endif 58 59 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550) 60 # ifndef HAVE_VSNPRINTF 61 # define HAVE_VSNPRINTF 62 # endif 63 #endif 64 65 #if defined(__CYGWIN__) 66 # ifndef HAVE_VSNPRINTF 67 # define HAVE_VSNPRINTF 68 # endif 69 #endif 70 71 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410) 72 # ifndef HAVE_VSNPRINTF 73 # define HAVE_VSNPRINTF 74 # endif 75 #endif 76 77 #ifndef HAVE_VSNPRINTF 78 # ifdef MSDOS 79 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?), 80 but for now we just assume it doesn't. */ 81 # define NO_vsnprintf 82 # endif 83 # ifdef __TURBOC__ 84 # define NO_vsnprintf 85 # endif 86 # ifdef WIN32 87 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */ 88 # if !defined(vsnprintf) && !defined(NO_vsnprintf) 89 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 ) 90 # define vsnprintf _vsnprintf 91 # endif 92 # endif 93 # endif 94 # ifdef __SASC 95 # define NO_vsnprintf 96 # endif 97 # ifdef VMS 98 # define NO_vsnprintf 99 # endif 100 # ifdef __OS400__ 101 # define NO_vsnprintf 102 # endif 103 # ifdef __MVS__ 104 # define NO_vsnprintf 105 # endif 106 #endif 107 108 /* unlike snprintf (which is required in C99), _snprintf does not guarantee 109 null termination of the result -- however this is only used in gzlib.c where 110 the result is assured to fit in the space provided */ 111 #if defined(_MSC_VER) && _MSC_VER < 1900 112 # define snprintf _snprintf 113 #endif 114 115 #ifndef local 116 # define local static 117 #endif 118 /* since "static" is used to mean two completely different things in C, we 119 define "local" for the non-static meaning of "static", for readability 120 (compile with -Dlocal if your debugger can't find static symbols) */ 121 122 /* gz* functions always use library allocation functions */ 123 #ifndef STDC 124 extern voidp malloc OF((uInt size)); 125 extern void free OF((voidpf ptr)); 126 #endif 127 128 /* get errno and strerror definition */ 129 #if defined UNDER_CE 130 # include <windows.h> 131 # define zstrerror() gz_strwinerror((DWORD)GetLastError()) 132 #else 133 # ifndef NO_STRERROR 134 # include <errno.h> 135 # define zstrerror() strerror(errno) 136 # else 137 # define zstrerror() "stdio error (consult errno)" 138 # endif 139 #endif 140 141 /* provide prototypes for these when building zlib without LFS */ 142 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0 143 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *)); 144 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int)); 145 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile)); 146 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile)); 147 #endif 148 149 /* default memLevel */ 150 #if MAX_MEM_LEVEL >= 8 151 # define DEF_MEM_LEVEL 8 152 #else 153 # define DEF_MEM_LEVEL MAX_MEM_LEVEL 154 #endif 155 156 /* default i/o buffer size -- double this for output when reading (this and 157 twice this must be able to fit in an unsigned type) */ 158 #define GZBUFSIZE 8192 159 160 /* gzip modes, also provide a little integrity check on the passed structure */ 161 #define GZ_NONE 0 162 #define GZ_READ 7247 163 #define GZ_WRITE 31153 164 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */ 165 166 /* values for gz_state how */ 167 #define LOOK 0 /* look for a gzip header */ 168 #define COPY 1 /* copy input directly */ 169 #define GZIP 2 /* decompress a gzip stream */ 170 171 /* internal gzip file state data structure */ 172 typedef struct { 173 /* exposed contents for gzgetc() macro */ 174 struct gzFile_s x; /* "x" for exposed */ 175 /* x.have: number of bytes available at x.next */ 176 /* x.next: next output data to deliver or write */ 177 /* x.pos: current position in uncompressed data */ 178 /* used for both reading and writing */ 179 int mode; /* see gzip modes above */ 180 int fd; /* file descriptor */ 181 char *path; /* path or fd for error messages */ 182 unsigned size; /* buffer size, zero if not allocated yet */ 183 unsigned want; /* requested buffer size, default is GZBUFSIZE */ 184 unsigned char *in; /* input buffer (double-sized when writing) */ 185 unsigned char *out; /* output buffer (double-sized when reading) */ 186 int direct; /* 0 if processing gzip, 1 if transparent */ 187 /* just for reading */ 188 int how; /* 0: get header, 1: copy, 2: decompress */ 189 z_off64_t start; /* where the gzip data started, for rewinding */ 190 int eof; /* true if end of input file reached */ 191 int past; /* true if read requested past end */ 192 /* just for writing */ 193 int level; /* compression level */ 194 int strategy; /* compression strategy */ 195 /* seek request */ 196 z_off64_t skip; /* amount to skip (already rewound if backwards) */ 197 int seek; /* true if seek request pending */ 198 /* error information */ 199 int err; /* error code */ 200 char *msg; /* error message */ 201 /* zlib inflate or deflate stream */ 202 z_stream strm; /* stream structure in-place (not a pointer) */ 203 } gz_state; 204 typedef gz_state FAR *gz_statep; 205 206 /* shared functions */ 207 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *)); 208 #if defined UNDER_CE 209 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error)); 210 #endif 211 212 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t 213 value -- needed when comparing unsigned to z_off64_t, which is signed 214 (possible z_off64_t types off_t, off64_t, and long are all signed) */ 215 #ifdef INT_MAX 216 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX) 217 #else 218 unsigned ZLIB_INTERNAL gz_intmax OF((void)); 219 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax()) 220 #endif 221