1/* gzguts.h -- zlib internal header definitions for gz* operations
2 * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 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
29#ifndef _POSIX_SOURCE
30# define _POSIX_SOURCE
31#endif
32#include <fcntl.h>
33
34#ifdef _WIN32
35# include <stddef.h>
36#endif
37
38#ifndef _WIN32_WCE
39#if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
40# include <io.h>
41#endif
42#endif
43#if defined(_WIN32) || defined(__CYGWIN__)
44# define WIDECHAR
45#endif
46
47#ifdef WINAPI_FAMILY
48# define open _open
49# define read _read
50# define write _write
51# define close _close
52#endif
53
54#ifdef NO_DEFLATE /* for compatibility with old definition */
55# define NO_GZCOMPRESS
56#endif
57
58#if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
59# ifndef HAVE_VSNPRINTF
60# define HAVE_VSNPRINTF
61# endif
62#endif
63
64#if defined(__CYGWIN__)
65# ifndef HAVE_VSNPRINTF
66# define HAVE_VSNPRINTF
67# endif
68#endif
69
70#if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
71# ifndef HAVE_VSNPRINTF
72# define HAVE_VSNPRINTF
73# endif
74#endif
75
76#ifndef HAVE_VSNPRINTF
77# ifdef MSDOS
78/* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
79 but for now we just assume it doesn't. */
80# define NO_vsnprintf
81# endif
82# ifdef __TURBOC__
83# define NO_vsnprintf
84# endif
85# ifdef WIN32
86/* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
87# if !defined(vsnprintf) && !defined(NO_vsnprintf)
88# if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
89# define vsnprintf _vsnprintf
90# endif
91# endif
92# endif
93# ifdef __SASC
94# define NO_vsnprintf
95# endif
96# ifdef VMS
97# define NO_vsnprintf
98# endif
99# ifdef __OS400__
100# define NO_vsnprintf
101# endif
102# ifdef __MVS__
103# define NO_vsnprintf
104# endif
105#endif
106
107/* unlike snprintf (which is required in C99), _snprintf does not guarantee
108 null termination of the result -- however this is only used in gzlib.c where
109 the result is assured to fit in the space provided */
110#if defined(_MSC_VER) && _MSC_VER < 1900
111# define snprintf _snprintf
112#endif
113
114#ifndef local
115# define local static
116#endif
117/* since "static" is used to mean two completely different things in C, we
118 define "local" for the non-static meaning of "static", for readability
119 (compile with -Dlocal if your debugger can't find static symbols) */
120
121/* gz* functions always use library allocation functions */
122#ifndef STDC
123 extern voidp malloc OF((uInt size));
124 extern void free OF((voidpf ptr));
125#endif
126
127/* get errno and strerror definition */
128#if defined UNDER_CE
129# include <windows.h>
130# define zstrerror() gz_strwinerror((DWORD)GetLastError())
131#else
132# ifndef NO_STRERROR
133# include <errno.h>
134# define zstrerror() strerror(errno)
135# else
136# define zstrerror() "stdio error (consult errno)"
137# endif
138#endif
139
140/* provide prototypes for these when building zlib without LFS */
141#if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
142 ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
143 ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
144 ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
145 ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
146#endif
147
148/* default memLevel */
149#if MAX_MEM_LEVEL >= 8
150# define DEF_MEM_LEVEL 8
151#else
152# define DEF_MEM_LEVEL MAX_MEM_LEVEL
153#endif
154
155/* default i/o buffer size -- double this for output when reading (this and
156 twice this must be able to fit in an unsigned type) */
157#define GZBUFSIZE 8192
158
159/* gzip modes, also provide a little integrity check on the passed structure */
160#define GZ_NONE 0
161#define GZ_READ 7247
162#define GZ_WRITE 31153
163#define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
164
165/* values for gz_state how */
166#define LOOK 0 /* look for a gzip header */
167#define COPY 1 /* copy input directly */
168#define GZIP 2 /* decompress a gzip stream */
169
170/* internal gzip file state data structure */
171typedef struct {
172 /* exposed contents for gzgetc() macro */
173 struct gzFile_s x; /* "x" for exposed */
174 /* x.have: number of bytes available at x.next */
175 /* x.next: next output data to deliver or write */
176 /* x.pos: current position in uncompressed data */
177 /* used for both reading and writing */
178 int mode; /* see gzip modes above */
179 int fd; /* file descriptor */
180 char *path; /* path or fd for error messages */
181 unsigned size; /* buffer size, zero if not allocated yet */
182 unsigned want; /* requested buffer size, default is GZBUFSIZE */
183 unsigned char *in; /* input buffer (double-sized when writing) */
184 unsigned char *out; /* output buffer (double-sized when reading) */
185 int direct; /* 0 if processing gzip, 1 if transparent */
186 /* just for reading */
187 int how; /* 0: get header, 1: copy, 2: decompress */
188 z_off64_t start; /* where the gzip data started, for rewinding */
189 int eof; /* true if end of input file reached */
190 int past; /* true if read requested past end */
191 /* just for writing */
192 int level; /* compression level */
193 int strategy; /* compression strategy */
194 /* seek request */
195 z_off64_t skip; /* amount to skip (already rewound if backwards) */
196 int seek; /* true if seek request pending */
197 /* error information */
198 int err; /* error code */
199 char *msg; /* error message */
200 /* zlib inflate or deflate stream */
201 z_stream strm; /* stream structure in-place (not a pointer) */
202} gz_state;
203typedef gz_state FAR *gz_statep;
204
205/* shared functions */
206void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
207#if defined UNDER_CE
208char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
209#endif
210
211/* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
212 value -- needed when comparing unsigned to z_off64_t, which is signed
213 (possible z_off64_t types off_t, off64_t, and long are all signed) */
214#ifdef INT_MAX
215# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
216#else
217unsigned ZLIB_INTERNAL gz_intmax OF((void));
218# define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
219#endif
220