1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
#ifndef GZGUTS_H_
#define GZGUTS_H_
/* gzguts.h -- zlib internal header definitions for gz* operations
* Copyright (C) 2004-2019 Mark Adler
* For conditions of distribution and use, see copyright notice in zlib.h
*/
#ifdef _LARGEFILE64_SOURCE
# ifndef _LARGEFILE_SOURCE
# define _LARGEFILE_SOURCE 1
# endif
# ifdef _FILE_OFFSET_BITS
# undef _FILE_OFFSET_BITS
# endif
#endif
#if defined(HAVE_VISIBILITY_INTERNAL)
# define Z_INTERNAL __attribute__((visibility ("internal")))
#elif defined(HAVE_VISIBILITY_HIDDEN)
# define Z_INTERNAL __attribute__((visibility ("hidden")))
#else
# define Z_INTERNAL
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <fcntl.h>
#if defined(ZLIB_COMPAT)
# include "zlib.h"
#else
# include "zlib-ng.h"
#endif
#ifdef _WIN32
# include <stddef.h>
#endif
#if defined(_WIN32)
# include <io.h>
# define WIDECHAR
#endif
#ifdef WINAPI_FAMILY
# define open _open
# define read _read
# define write _write
# define close _close
#endif
/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
#if !defined(STDC99) && !defined(__CYGWIN__) && !defined(__MINGW__) && defined(_WIN32)
# if !defined(vsnprintf)
# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
# define vsnprintf _vsnprintf
# endif
# endif
#endif
/* unlike snprintf (which is required in C99), _snprintf does not guarantee
null termination of the result -- however this is only used in gzlib.c
where the result is assured to fit in the space provided */
#if defined(_MSC_VER) && _MSC_VER < 1900
# define snprintf _snprintf
#endif
/* get errno and strerror definition */
#ifndef NO_STRERROR
# include <errno.h>
# define zstrerror() strerror(errno)
#else
# define zstrerror() "stdio error (consult errno)"
#endif
/* default memLevel */
#if MAX_MEM_LEVEL >= 8
# define DEF_MEM_LEVEL 8
#else
# define DEF_MEM_LEVEL MAX_MEM_LEVEL
#endif
/* default i/o buffer size -- double this for output when reading (this and
twice this must be able to fit in an unsigned type) */
#ifndef GZBUFSIZE
# define GZBUFSIZE 131072
#endif
/* gzip modes, also provide a little integrity check on the passed structure */
#define GZ_NONE 0
#define GZ_READ 7247
#define GZ_WRITE 31153
#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
/* values for gz_state how */
#define LOOK 0 /* look for a gzip header */
#define COPY 1 /* copy input directly */
#define GZIP 2 /* decompress a gzip stream */
/* internal gzip file state data structure */
typedef struct {
/* exposed contents for gzgetc() macro */
struct gzFile_s x; /* "x" for exposed */
/* x.have: number of bytes available at x.next */
/* x.next: next output data to deliver or write */
/* x.pos: current position in uncompressed data */
/* used for both reading and writing */
int mode; /* see gzip modes above */
int fd; /* file descriptor */
char *path; /* path or fd for error messages */
unsigned size; /* buffer size, zero if not allocated yet */
unsigned want; /* requested buffer size, default is GZBUFSIZE */
unsigned char *in; /* input buffer (double-sized when writing) */
unsigned char *out; /* output buffer (double-sized when reading) */
int direct; /* 0 if processing gzip, 1 if transparent */
/* just for reading */
int how; /* 0: get header, 1: copy, 2: decompress */
z_off64_t start; /* where the gzip data started, for rewinding */
int eof; /* true if end of input file reached */
int past; /* true if read requested past end */
/* just for writing */
int level; /* compression level */
int strategy; /* compression strategy */
int reset; /* true if a reset is pending after a Z_FINISH */
/* seek request */
z_off64_t skip; /* amount to skip (already rewound if backwards) */
int seek; /* true if seek request pending */
/* error information */
int err; /* error code */
char *msg; /* error message */
/* zlib inflate or deflate stream */
PREFIX3(stream) strm; /* stream structure in-place (not a pointer) */
} gz_state;
typedef gz_state *gz_statep;
/* shared functions */
void Z_INTERNAL gz_error(gz_state *, int, const char *);
/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
value -- needed when comparing unsigned to z_off64_t, which is signed
(possible z_off64_t types off_t, off64_t, and long are all signed) */
#define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
#endif /* GZGUTS_H_ */