1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 /* gzguts.h -- zlib internal header definitions for gz* operations
26 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
27 * For conditions of distribution and use, see copyright notice in zlib.h
28 */
29
30 #ifdef _LARGEFILE64_SOURCE
31 # ifndef _LARGEFILE_SOURCE
32 # define _LARGEFILE_SOURCE 1
33 # endif
34 # ifdef _FILE_OFFSET_BITS
35 # undef _FILE_OFFSET_BITS
36 # endif
37 #endif
38
39 #ifdef HAVE_HIDDEN
40 # define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
41 #else
42 # define ZLIB_INTERNAL
43 #endif
44
45 #include <stdio.h>
46 #include "zlib.h"
47 #ifdef STDC
48 # include <string.h>
49 # include <stdlib.h>
50 # include <limits.h>
51 #endif
52
53 #ifndef _POSIX_SOURCE
54 # define _POSIX_SOURCE
55 #endif
56 #include <fcntl.h>
57
58 #ifdef _WIN32
59 # include <stddef.h>
60 #endif
61
62 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
63 # include <io.h>
64 #endif
65
66 #if defined(_WIN32) || defined(__CYGWIN__)
67 # define WIDECHAR
68 #endif
69
70 #ifdef WINAPI_FAMILY
71 # define open _open
72 # define read _read
73 # define write _write
74 # define close _close
75 #endif
76
77 #ifdef NO_DEFLATE /* for compatibility with old definition */
78 # define NO_GZCOMPRESS
79 #endif
80
81 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
82 # ifndef HAVE_VSNPRINTF
83 # define HAVE_VSNPRINTF
84 # endif
85 #endif
86
87 #if defined(__CYGWIN__)
88 # ifndef HAVE_VSNPRINTF
89 # define HAVE_VSNPRINTF
90 # endif
91 #endif
92
93 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
94 # ifndef HAVE_VSNPRINTF
95 # define HAVE_VSNPRINTF
96 # endif
97 #endif
98
99 #ifndef HAVE_VSNPRINTF
100 # ifdef MSDOS
101 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
102 but for now we just assume it doesn't. */
103 # define NO_vsnprintf
104 # endif
105 # ifdef __TURBOC__
106 # define NO_vsnprintf
107 # endif
108 # ifdef WIN32
109 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
110 # if !defined(vsnprintf) && !defined(NO_vsnprintf)
111 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
112 # define vsnprintf _vsnprintf
113 # endif
114 # endif
115 # endif
116 # ifdef __SASC
117 # define NO_vsnprintf
118 # endif
119 # ifdef VMS
120 # define NO_vsnprintf
121 # endif
122 # ifdef __OS400__
123 # define NO_vsnprintf
124 # endif
125 # ifdef __MVS__
126 # define NO_vsnprintf
127 # endif
128 #endif
129
130 /* unlike snprintf (which is required in C99), _snprintf does not guarantee
131 null termination of the result -- however this is only used in gzlib.c where
132 the result is assured to fit in the space provided */
133 #if defined(_MSC_VER) && _MSC_VER < 1900
134 # define snprintf _snprintf
135 #endif
136
137 #ifndef local
138 # define local static
139 #endif
140 /* since "static" is used to mean two completely different things in C, we
141 define "local" for the non-static meaning of "static", for readability
142 (compile with -Dlocal if your debugger can't find static symbols) */
143
144 /* gz* functions always use library allocation functions */
145 #ifndef STDC
146 extern voidp malloc OF((uInt size));
147 extern void free OF((voidpf ptr));
148 #endif
149
150 /* get errno and strerror definition */
151 #if defined UNDER_CE
152 # include <windows.h>
153 # define zstrerror() gz_strwinerror((DWORD)GetLastError())
154 #else
155 # ifndef NO_STRERROR
156 # include <errno.h>
157 # define zstrerror() strerror(errno)
158 # else
159 # define zstrerror() "stdio error (consult errno)"
160 # endif
161 #endif
162
163 /* provide prototypes for these when building zlib without LFS */
164 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
165 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
166 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
167 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
168 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
169 #endif
170
171 /* default memLevel */
172 #if MAX_MEM_LEVEL >= 8
173 # define DEF_MEM_LEVEL 8
174 #else
175 # define DEF_MEM_LEVEL MAX_MEM_LEVEL
176 #endif
177
178 /* default i/o buffer size -- double this for output when reading (this and
179 twice this must be able to fit in an unsigned type) */
180 #define GZBUFSIZE 8192
181
182 /* gzip modes, also provide a little integrity check on the passed structure */
183 #define GZ_NONE 0
184 #define GZ_READ 7247
185 #define GZ_WRITE 31153
186 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
187
188 /* values for gz_state how */
189 #define LOOK 0 /* look for a gzip header */
190 #define COPY 1 /* copy input directly */
191 #define GZIP 2 /* decompress a gzip stream */
192
193 /* internal gzip file state data structure */
194 typedef struct {
195 /* exposed contents for gzgetc() macro */
196 struct gzFile_s x; /* "x" for exposed */
197 /* x.have: number of bytes available at x.next */
198 /* x.next: next output data to deliver or write */
199 /* x.pos: current position in uncompressed data */
200 /* used for both reading and writing */
201 int mode; /* see gzip modes above */
202 int fd; /* file descriptor */
203 char *path; /* path or fd for error messages */
204 unsigned size; /* buffer size, zero if not allocated yet */
205 unsigned want; /* requested buffer size, default is GZBUFSIZE */
206 unsigned char *in; /* input buffer (double-sized when writing) */
207 unsigned char *out; /* output buffer (double-sized when reading) */
208 int direct; /* 0 if processing gzip, 1 if transparent */
209 /* just for reading */
210 int how; /* 0: get header, 1: copy, 2: decompress */
211 z_off64_t start; /* where the gzip data started, for rewinding */
212 int eof; /* true if end of input file reached */
213 int past; /* true if read requested past end */
214 /* just for writing */
215 int level; /* compression level */
216 int strategy; /* compression strategy */
217 /* seek request */
218 z_off64_t skip; /* amount to skip (already rewound if backwards) */
219 int seek; /* true if seek request pending */
220 /* error information */
221 int err; /* error code */
222 char *msg; /* error message */
223 /* zlib inflate or deflate stream */
224 z_stream strm; /* stream structure in-place (not a pointer) */
225 } gz_state;
226 typedef gz_state FAR *gz_statep;
227
228 /* shared functions */
229 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
230 #if defined UNDER_CE
231 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
232 #endif
233
234 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
235 value -- needed when comparing unsigned to z_off64_t, which is signed
236 (possible z_off64_t types off_t, off64_t, and long are all signed) */
237 #ifdef INT_MAX
238 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
239 #else
240 unsigned ZLIB_INTERNAL gz_intmax OF((void));
241 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
242 #endif