b0d10aaab780c1b1ad1d2640c1925d739145e439
[reactos.git] / reactos / lib / 3rdparty / zlib / gzguts.h
1 /* gzguts.h -- zlib internal header definitions for gz* operations
2 * Copyright (C) 2004, 2005, 2010 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 #if ((__GNUC__-0) * 10 + __GNUC_MINOR__-0 >= 33) && !defined(NO_VIZ)
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 <io.h>
29 #include <fcntl.h>
30
31 #ifdef NO_DEFLATE /* for compatibility with old definition */
32 # define NO_GZCOMPRESS
33 #endif
34
35 #ifdef _MSC_VER
36 # include <io.h>
37 # define vsnprintf _vsnprintf
38 #endif
39
40 #ifndef local
41 # define local static
42 #endif
43 /* compile with -Dlocal if your debugger can't find static symbols */
44
45 /* gz* functions always use library allocation functions */
46 #ifndef STDC
47 extern voidp malloc OF((uInt size));
48 extern void free OF((voidpf ptr));
49 #endif
50
51 /* get errno and strerror definition */
52 #if defined UNDER_CE
53 # include <windows.h>
54 # define zstrerror() gz_strwinerror((DWORD)GetLastError())
55 #else
56 # ifdef STDC
57 # include <errno.h>
58 # define zstrerror() strerror(errno)
59 # else
60 # define zstrerror() "stdio error (consult errno)"
61 # endif
62 #endif
63
64 /* provide prototypes for these when building zlib without LFS */
65 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
66 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
67 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
68 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
69 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
70 #endif
71
72 /* default i/o buffer size -- double this for output when reading */
73 #define GZBUFSIZE 8192
74
75 /* gzip modes, also provide a little integrity check on the passed structure */
76 #define GZ_NONE 0
77 #define GZ_READ 7247
78 #define GZ_WRITE 31153
79 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
80
81 /* values for gz_state how */
82 #define LOOK 0 /* look for a gzip header */
83 #define COPY 1 /* copy input directly */
84 #define GZIP 2 /* decompress a gzip stream */
85
86 /* internal gzip file state data structure */
87 typedef struct {
88 /* used for both reading and writing */
89 int mode; /* see gzip modes above */
90 int fd; /* file descriptor */
91 char *path; /* path or fd for error messages */
92 z_off64_t pos; /* current position in uncompressed data */
93 unsigned size; /* buffer size, zero if not allocated yet */
94 unsigned want; /* requested buffer size, default is GZBUFSIZE */
95 unsigned char *in; /* input buffer */
96 unsigned char *out; /* output buffer (double-sized when reading) */
97 unsigned char *next; /* next output data to deliver or write */
98 /* just for reading */
99 unsigned have; /* amount of output data unused at next */
100 int eof; /* true if end of input file reached */
101 z_off64_t start; /* where the gzip data started, for rewinding */
102 z_off64_t raw; /* where the raw data started, for seeking */
103 int how; /* 0: get header, 1: copy, 2: decompress */
104 int direct; /* true if last read direct, false if gzip */
105 /* just for writing */
106 int level; /* compression level */
107 int strategy; /* compression strategy */
108 /* seek request */
109 z_off64_t skip; /* amount to skip (already rewound if backwards) */
110 int seek; /* true if seek request pending */
111 /* error information */
112 int err; /* error code */
113 char *msg; /* error message */
114 /* zlib inflate or deflate stream */
115 z_stream strm; /* stream structure in-place (not a pointer) */
116 } gz_state;
117 typedef gz_state FAR *gz_statep;
118
119 /* shared functions */
120 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
121 #if defined UNDER_CE
122 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
123 #endif
124
125 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
126 value -- needed when comparing unsigned to z_off64_t, which is signed
127 (possible z_off64_t types off_t, off64_t, and long are all signed) */
128 #ifdef INT_MAX
129 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
130 #else
131 unsigned ZLIB_INTERNAL gz_intmax OF((void));
132 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
133 #endif