1#ifndef GZGUTS_H_
2#define GZGUTS_H_
3/* gzguts.h -- zlib internal header definitions for gz* operations
4 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
5 * For conditions of distribution and use, see copyright notice in zlib.h
6 */
7
8#ifdef _LARGEFILE64_SOURCE
9# ifndef _LARGEFILE_SOURCE
10# define _LARGEFILE_SOURCE 1
11# endif
12# ifdef _FILE_OFFSET_BITS
13# undef _FILE_OFFSET_BITS
14# endif
15#endif
16
17#if defined(HAVE_VISIBILITY_INTERNAL)
18# define Z_INTERNAL __attribute__((visibility ("internal")))
19#elif defined(HAVE_VISIBILITY_HIDDEN)
20# define Z_INTERNAL __attribute__((visibility ("hidden")))
21#else
22# define Z_INTERNAL
23#endif
24
25#include <stdio.h>
26#include <string.h>
27#include <stdlib.h>
28#include <limits.h>
29#include <fcntl.h>
30
31#if defined(ZLIB_COMPAT)
32# include "zlib.h"
33#else
34# include "zlib-ng.h"
35#endif
36
37#ifdef _WIN32
38# include <stddef.h>
39#endif
40
41#if !defined(_MSC_VER) || defined(__MINGW__)
42# include <unistd.h> /* for lseek(), read(), close(), write(), unlink() */
43#endif
44
45#if defined(_WIN32)
46# include <io.h>
47# define WIDECHAR
48#endif
49
50#ifdef WINAPI_FAMILY
51# define open _open
52# define read _read
53# define write _write
54# define close _close
55#endif
56
57/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
58#if !defined(STDC99) && !defined(__CYGWIN__) && !defined(__MINGW__) && defined(_WIN32)
59# if !defined(vsnprintf)
60# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
61# define vsnprintf _vsnprintf
62# endif
63# endif
64#endif
65
66/* unlike snprintf (which is required in C99), _snprintf does not guarantee
67 null termination of the result -- however this is only used in gzlib.c
68 where the result is assured to fit in the space provided */
69#if defined(_MSC_VER) && _MSC_VER < 1900
70# define snprintf _snprintf
71#endif
72
73/* get errno and strerror definition */
74#ifndef NO_STRERROR
75# include <errno.h>
76# define zstrerror() strerror(errno)
77#else
78# define zstrerror() "stdio error (consult errno)"
79#endif
80
81/* default memLevel */
82#if MAX_MEM_LEVEL >= 8
83# define DEF_MEM_LEVEL 8
84#else
85# define DEF_MEM_LEVEL MAX_MEM_LEVEL
86#endif
87
88/* default i/o buffer size -- double this for output when reading (this and
89 twice this must be able to fit in an unsigned type) */
90#ifndef GZBUFSIZE
91# define GZBUFSIZE 8192
92#endif
93
94/* gzip modes, also provide a little integrity check on the passed structure */
95#define GZ_NONE 0
96#define GZ_READ 7247
97#define GZ_WRITE 31153
98#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
99
100/* values for gz_state how */
101#define LOOK 0 /* look for a gzip header */
102#define COPY 1 /* copy input directly */
103#define GZIP 2 /* decompress a gzip stream */
104
105/* internal gzip file state data structure */
106typedef struct {
107 /* exposed contents for gzgetc() macro */
108 struct gzFile_s x; /* "x" for exposed */
109 /* x.have: number of bytes available at x.next */
110 /* x.next: next output data to deliver or write */
111 /* x.pos: current position in uncompressed data */
112 /* used for both reading and writing */
113 int mode; /* see gzip modes above */
114 int fd; /* file descriptor */
115 char *path; /* path or fd for error messages */
116 unsigned size; /* buffer size, zero if not allocated yet */
117 unsigned want; /* requested buffer size, default is GZBUFSIZE */
118 unsigned char *in; /* input buffer (double-sized when writing) */
119 unsigned char *out; /* output buffer (double-sized when reading) */
120 int direct; /* 0 if processing gzip, 1 if transparent */
121 /* just for reading */
122 int how; /* 0: get header, 1: copy, 2: decompress */
123 z_off64_t start; /* where the gzip data started, for rewinding */
124 int eof; /* true if end of input file reached */
125 int past; /* true if read requested past end */
126 /* just for writing */
127 int level; /* compression level */
128 int strategy; /* compression strategy */
129 int reset; /* true if a reset is pending after a Z_FINISH */
130 /* seek request */
131 z_off64_t skip; /* amount to skip (already rewound if backwards) */
132 int seek; /* true if seek request pending */
133 /* error information */
134 int err; /* error code */
135 char *msg; /* error message */
136 /* zlib inflate or deflate stream */
137 PREFIX3(stream) strm; /* stream structure in-place (not a pointer) */
138} gz_state;
139typedef gz_state *gz_statep;
140
141/* shared functions */
142void Z_INTERNAL gz_error(gz_state *, int, const char *);
143
144/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
145 value -- needed when comparing unsigned to z_off64_t, which is signed
146 (possible z_off64_t types off_t, off64_t, and long are all signed) */
147#ifdef INT_MAX
148# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
149#else
150unsigned Z_INTERNAL gz_intmax(void);
151# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
152#endif
153
154#endif /* GZGUTS_H_ */
155