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