Update zlib from 1.2.3 to 1.2.5
[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 <fcntl.h>
29
30 #ifdef NO_DEFLATE /* for compatibility with old definition */
31 # define NO_GZCOMPRESS
32 #endif
33
34 #ifdef _MSC_VER
35 # include <io.h>
36 # define vsnprintf _vsnprintf
37 #endif
38
39 #ifndef local
40 # define local static
41 #endif
42 /* compile with -Dlocal if your debugger can't find static symbols */
43
44 /* gz* functions always use library allocation functions */
45 #ifndef STDC
46 extern voidp malloc OF((uInt size));
47 extern void free OF((voidpf ptr));
48 #endif
49
50 /* get errno and strerror definition */
51 #if defined UNDER_CE
52 # include <windows.h>
53 # define zstrerror() gz_strwinerror((DWORD)GetLastError())
54 #else
55 # ifdef STDC
56 # include <errno.h>
57 # define zstrerror() strerror(errno)
58 # else
59 # define zstrerror() "stdio error (consult errno)"
60 # endif
61 #endif
62
63 /* provide prototypes for these when building zlib without LFS */
64 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
65 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
66 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
67 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
68 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
69 #endif
70
71 /* default i/o buffer size -- double this for output when reading */
72 #define GZBUFSIZE 8192
73
74 /* gzip modes, also provide a little integrity check on the passed structure */
75 #define GZ_NONE 0
76 #define GZ_READ 7247
77 #define GZ_WRITE 31153
78 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
79
80 /* values for gz_state how */
81 #define LOOK 0 /* look for a gzip header */
82 #define COPY 1 /* copy input directly */
83 #define GZIP 2 /* decompress a gzip stream */
84
85 /* internal gzip file state data structure */
86 typedef struct {
87 /* used for both reading and writing */
88 int mode; /* see gzip modes above */
89 int fd; /* file descriptor */
90 char *path; /* path or fd for error messages */
91 z_off64_t pos; /* current position in uncompressed data */
92 unsigned size; /* buffer size, zero if not allocated yet */
93 unsigned want; /* requested buffer size, default is GZBUFSIZE */
94 unsigned char *in; /* input buffer */
95 unsigned char *out; /* output buffer (double-sized when reading) */
96 unsigned char *next; /* next output data to deliver or write */
97 /* just for reading */
98 unsigned have; /* amount of output data unused at next */
99 int eof; /* true if end of input file reached */
100 z_off64_t start; /* where the gzip data started, for rewinding */
101 z_off64_t raw; /* where the raw data started, for seeking */
102 int how; /* 0: get header, 1: copy, 2: decompress */
103 int direct; /* true if last read direct, false if gzip */
104 /* just for writing */
105 int level; /* compression level */
106 int strategy; /* compression strategy */
107 /* seek request */
108 z_off64_t skip; /* amount to skip (already rewound if backwards) */
109 int seek; /* true if seek request pending */
110 /* error information */
111 int err; /* error code */
112 char *msg; /* error message */
113 /* zlib inflate or deflate stream */
114 z_stream strm; /* stream structure in-place (not a pointer) */
115 } gz_state;
116 typedef gz_state FAR *gz_statep;
117
118 /* shared functions */
119 void gz_error OF((gz_statep, int, const char *));
120 #if defined UNDER_CE
121 char *gz_strwinerror OF((DWORD error));
122 #endif
123
124 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
125 value -- needed when comparing unsigned to z_off64_t, which is signed
126 (possible z_off64_t types off_t, off64_t, and long are all signed) */
127 #ifdef INT_MAX
128 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
129 #else
130 unsigned gz_intmax OF((void));
131 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
132 #endif