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