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