1 /* gzguts.h -- zlib internal header definitions for gz* operations
2 * Copyright (C) 2004-2019 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
29 #ifndef _POSIX_SOURCE
30 # define _POSIX_SOURCE
31 #endif
32 #include <fcntl.h>
33
34 #ifdef _WIN32
35 # include <stddef.h>
36 #endif
37
38 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
39 # include <io.h>
40 #endif
41
42 #if defined(_WIN32)
43 # define WIDECHAR
44 #endif
45
46 #ifdef WINAPI_FAMILY
47 # define open _open
48 # define read _read
49 # define write _write
50 # define close _close
51 #endif
52
53 #ifdef NO_DEFLATE /* for compatibility with old definition */
54 # define NO_GZCOMPRESS
55 #endif
56
57 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
58 # ifndef HAVE_VSNPRINTF
59 # define HAVE_VSNPRINTF
60 # endif
61 #endif
62
63 #if defined(__CYGWIN__)
64 # ifndef HAVE_VSNPRINTF
65 # define HAVE_VSNPRINTF
66 # endif
67 #endif
68
69 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
70 # ifndef HAVE_VSNPRINTF
71 # define HAVE_VSNPRINTF
72 # endif
73 #endif
74
75 #ifndef HAVE_VSNPRINTF
76 # ifdef MSDOS
77 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
78 but for now we just assume it doesn't. */
79 # define NO_vsnprintf
80 # endif
81 # ifdef __TURBOC__
82 # define NO_vsnprintf
83 # endif
84 # ifdef WIN32
85 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
86 # if !defined(vsnprintf) && !defined(NO_vsnprintf)
87 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
88 # define vsnprintf _vsnprintf
89 # endif
90 # endif
91 # endif
92 # ifdef __SASC
93 # define NO_vsnprintf
94 # endif
95 # ifdef VMS
96 # define NO_vsnprintf
97 # endif
98 # ifdef __OS400__
99 # define NO_vsnprintf
100 # endif
101 # ifdef __MVS__
102 # define NO_vsnprintf
103 # endif
104 #endif
105
106 /* unlike snprintf (which is required in C99), _snprintf does not guarantee
107 null termination of the result -- however this is only used in gzlib.c where
108 the result is assured to fit in the space provided */
109 #if defined(_MSC_VER) && _MSC_VER < 1900
110 # define snprintf _snprintf
111 #endif
112
113 #ifndef local
114 # define local static
115 #endif
116 /* since "static" is used to mean two completely different things in C, we
117 define "local" for the non-static meaning of "static", for readability
118 (compile with -Dlocal if your debugger can't find static symbols) */
119
120 /* gz* functions always use library allocation functions */
121 #ifndef STDC
122 extern voidp malloc OF((uInt size));
123 extern void free OF((voidpf ptr));
124 #endif
125
126 /* get errno and strerror definition */
127 #if defined UNDER_CE
128 # include <windows.h>
129 # define zstrerror() gz_strwinerror((DWORD)GetLastError())
130 #else
131 # ifndef NO_STRERROR
132 # include <errno.h>
133 # define zstrerror() strerror(errno)
134 # else
135 # define zstrerror() "stdio error (consult errno)"
136 # endif
137 #endif
138
139 /* provide prototypes for these when building zlib without LFS */
140 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
141 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
142 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
143 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
144 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
145 #endif
146
147 /* default memLevel */
148 #if MAX_MEM_LEVEL >= 8
149 # define DEF_MEM_LEVEL 8
150 #else
151 # define DEF_MEM_LEVEL MAX_MEM_LEVEL
152 #endif
153
154 /* default i/o buffer size -- double this for output when reading (this and
155 twice this must be able to fit in an unsigned type) */
156 #define GZBUFSIZE 8192
157
158 /* gzip modes, also provide a little integrity check on the passed structure */
159 #define GZ_NONE 0
160 #define GZ_READ 7247
161 #define GZ_WRITE 31153
162 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
163
164 /* values for gz_state how */
165 #define LOOK 0 /* look for a gzip header */
166 #define COPY__ 1 /* copy input directly */
167 #define GZIP 2 /* decompress a gzip stream */
168
169 /* internal gzip file state data structure */
170 typedef struct {
171 /* exposed contents for gzgetc() macro */
172 struct gzFile_s x; /* "x" for exposed */
173 /* x.have: number of bytes available at x.next */
174 /* x.next: next output data to deliver or write */
175 /* x.pos: current position in uncompressed data */
176 /* used for both reading and writing */
177 int mode; /* see gzip modes above */
178 int fd; /* file descriptor */
179 char *path; /* path or fd for error messages */
180 unsigned size; /* buffer size, zero if not allocated yet */
181 unsigned want; /* requested buffer size, default is GZBUFSIZE */
182 unsigned char *in; /* input buffer (double-sized when writing) */
183 unsigned char *out; /* output buffer (double-sized when reading) */
184 int direct; /* 0 if processing gzip, 1 if transparent */
185 /* just for reading */
186 int how; /* 0: get header, 1: copy, 2: decompress */
187 z_off64_t start; /* where the gzip data started, for rewinding */
188 int eof; /* true if end of input file reached */
189 int past; /* true if read requested past end */
190 /* just for writing */
191 int level; /* compression level */
192 int strategy; /* compression strategy */
193 int reset; /* true if a reset is pending after a Z_FINISH */
194 /* seek request */
195 z_off64_t skip; /* amount to skip (already rewound if backwards) */
196 int seek; /* true if seek request pending */
197 /* error information */
198 int err; /* error code */
199 char *msg; /* error message */
200 /* zlib inflate or deflate stream */
201 z_stream strm; /* stream structure in-place (not a pointer) */
202 } gz_state;
203 typedef gz_state FAR *gz_statep;
204
205 /* shared functions */
206 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
207 #if defined UNDER_CE
208 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
209 #endif
210
211 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
212 value -- needed when comparing unsigned to z_off64_t, which is signed
213 (possible z_off64_t types off_t, off64_t, and long are all signed) */
214 #ifdef INT_MAX
215 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
216 #else
217 unsigned ZLIB_INTERNAL gz_intmax OF((void));
218 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
219 #endif