pngcrush  1.8.13
About: Pngcrush is an optimizer for PNG (Portable Network Graphics) files.
  Fossies Dox: pngcrush-1.8.13.tar.gz  ("inofficial" and yet experimental doxygen-generated source code documentation)  

gzguts.h
Go to the documentation of this file.
1 /* gzguts.h -- zlib internal header definitions for gz* operations
2  * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
3  * For conditions of distribution and use, see copyright notice in zlib.h
4  */
5 
6 #ifndef NO_GZ
7 #ifndef ZLIB_GZGUTS_H
8 #define ZLIB_GZGUTS_H
9 
10 #ifdef _LARGEFILE64_SOURCE
11 # ifndef _LARGEFILE_SOURCE
12 # define _LARGEFILE_SOURCE 1
13 # endif
14 # ifdef _FILE_OFFSET_BITS
15 # undef _FILE_OFFSET_BITS
16 # endif
17 #endif
18 
19 #ifdef HAVE_HIDDEN
20 # define ZLIB_INTERNAL __attribute__((visibility ("hidden")))
21 #else
22 # define ZLIB_INTERNAL
23 #endif
24 
25 #include <stdio.h>
26 #include "zlib.h"
27 #ifdef STDC
28 # include <string.h>
29 # include <stdlib.h>
30 # include <limits.h>
31 #endif
32 
33 #ifndef _POSIX_SOURCE
34 # define _POSIX_SOURCE
35 #endif
36 #include <fcntl.h>
37 
38 #ifdef _WIN32
39 # include <stddef.h>
40 #endif
41 
42 #if defined(__TURBOC__) || defined(_MSC_VER) || defined(_WIN32)
43 # include <io.h>
44 #endif
45 
46 #if defined(_WIN32) || defined(__CYGWIN__)
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 #ifdef NO_DEFLATE /* for compatibility with old definition */
58 # define NO_GZCOMPRESS
59 #endif
60 
61 #if defined(STDC99) || (defined(__TURBOC__) && __TURBOC__ >= 0x550)
62 # ifndef HAVE_VSNPRINTF
63 # define HAVE_VSNPRINTF
64 # endif
65 #endif
66 
67 #if defined(__CYGWIN__)
68 # ifndef HAVE_VSNPRINTF
69 # define HAVE_VSNPRINTF
70 # endif
71 #endif
72 
73 #if defined(MSDOS) && defined(__BORLANDC__) && (BORLANDC > 0x410)
74 # ifndef HAVE_VSNPRINTF
75 # define HAVE_VSNPRINTF
76 # endif
77 #endif
78 
79 #ifndef HAVE_VSNPRINTF
80 # ifdef MSDOS
81 /* vsnprintf may exist on some MS-DOS compilers (DJGPP?),
82  but for now we just assume it doesn't. */
83 # define NO_vsnprintf
84 # endif
85 # ifdef __TURBOC__
86 # define NO_vsnprintf
87 # endif
88 # ifdef WIN32
89 /* In Win32, vsnprintf is available as the "non-ANSI" _vsnprintf. */
90 # if !defined(vsnprintf) && !defined(NO_vsnprintf)
91 # if !defined(_MSC_VER) || ( defined(_MSC_VER) && _MSC_VER < 1500 )
92 # define vsnprintf _vsnprintf
93 # endif
94 # endif
95 # endif
96 # ifdef __SASC
97 # define NO_vsnprintf
98 # endif
99 # ifdef VMS
100 # define NO_vsnprintf
101 # endif
102 # ifdef __OS400__
103 # define NO_vsnprintf
104 # endif
105 # ifdef __MVS__
106 # define NO_vsnprintf
107 # endif
108 #endif
109 
110 /* unlike snprintf (which is required in C99), _snprintf does not guarantee
111  null termination of the result -- however this is only used in gzlib.c where
112  the result is assured to fit in the space provided */
113 #if defined(_MSC_VER) && _MSC_VER < 1900
114 # define snprintf _snprintf
115 #endif
116 
117 #ifndef local
118 # define local static
119 #endif
120 /* since "static" is used to mean two completely different things in C, we
121  define "local" for the non-static meaning of "static", for readability
122  (compile with -Dlocal if your debugger can't find static symbols) */
123 
124 /* gz* functions always use library allocation functions */
125 #ifndef STDC
126  extern voidp malloc OF((uInt size));
127  extern void free OF((voidpf ptr));
128 #endif
129 
130 /* get errno and strerror definition */
131 #if defined UNDER_CE
132 # include <windows.h>
133 # define zstrerror() gz_strwinerror((DWORD)GetLastError())
134 #else
135 # ifndef NO_STRERROR
136 # include <errno.h>
137 # define zstrerror() strerror(errno)
138 # else
139 # define zstrerror() "stdio error (consult errno)"
140 # endif
141 #endif
142 
143 /* provide prototypes for these when building zlib without LFS */
144 #if !defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0
145  ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
149 #endif
150 
151 /* default memLevel */
152 #if MAX_MEM_LEVEL >= 8
153 # define DEF_MEM_LEVEL 8
154 #else
155 # define DEF_MEM_LEVEL MAX_MEM_LEVEL
156 #endif
157 
158 /* default i/o buffer size -- double this for output when reading (this and
159  twice this must be able to fit in an unsigned type) */
160 #define GZBUFSIZE 8192
161 
162 /* gzip modes, also provide a little integrity check on the passed structure */
163 #define GZ_NONE 0
164 #define GZ_READ 7247
165 #define GZ_WRITE 31153
166 #define GZ_APPEND 1 /* mode set to GZ_WRITE after the file is opened */
167 
168 /* values for gz_state how */
169 #define LOOK 0 /* look for a gzip header */
170 #define COPY 1 /* copy input directly */
171 #define GZIP 2 /* decompress a gzip stream */
172 
173 /* internal gzip file state data structure */
174 typedef struct {
175  /* exposed contents for gzgetc() macro */
176  struct gzFile_s x; /* "x" for exposed */
177  /* x.have: number of bytes available at x.next */
178  /* x.next: next output data to deliver or write */
179  /* x.pos: current position in uncompressed data */
180  /* used for both reading and writing */
181  int mode; /* see gzip modes above */
182  int fd; /* file descriptor */
183  char *path; /* path or fd for error messages */
184  unsigned size; /* buffer size, zero if not allocated yet */
185  unsigned want; /* requested buffer size, default is GZBUFSIZE */
186  unsigned char *in; /* input buffer (double-sized when writing) */
187  unsigned char *out; /* output buffer (double-sized when reading) */
188  int direct; /* 0 if processing gzip, 1 if transparent */
189  /* just for reading */
190  int how; /* 0: get header, 1: copy, 2: decompress */
191  z_off64_t start; /* where the gzip data started, for rewinding */
192  int eof; /* true if end of input file reached */
193  int past; /* true if read requested past end */
194  /* just for writing */
195  int level; /* compression level */
196  int strategy; /* compression strategy */
197  /* seek request */
198  z_off64_t skip; /* amount to skip (already rewound if backwards) */
199  int seek; /* true if seek request pending */
200  /* error information */
201  int err; /* error code */
202  char *msg; /* error message */
203  /* zlib inflate or deflate stream */
204  z_stream strm; /* stream structure in-place (not a pointer) */
205 } gz_state;
207 
208 /* shared functions */
209 void ZLIB_INTERNAL gz_error OF((gz_statep, int, const char *));
210 #if defined UNDER_CE
211 char ZLIB_INTERNAL *gz_strwinerror OF((DWORD error));
212 #endif
213 
214 /* GT_OFF(x), where x is an unsigned value, is true if x > maximum z_off64_t
215  value -- needed when comparing unsigned to z_off64_t, which is signed
216  (possible z_off64_t types off_t, off64_t, and long are all signed) */
217 #ifdef INT_MAX
218 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > INT_MAX)
219 #else
220 unsigned ZLIB_INTERNAL gz_intmax OF((void));
221 # define GT_OFF(x) (sizeof(int) == sizeof(z_off64_t) && (x) > gz_intmax())
222 #endif
223 #endif /* ZLIB_GZGUTS_H */
224 #endif /* NO_GZ */
gz_statep
gz_state * gz_statep
Definition: gzguts.h:206
ZEXTERN
#define ZEXTERN
Definition: zconf.h:377
gz_state::fd
int fd
Definition: gzguts.h:182
gzopen64
gzFile gzopen64()
gz_state::eof
int eof
Definition: gzguts.h:192
gzFile_s
Definition: zlib.h:1829
free
void free()
gz_state::path
char * path
Definition: gzguts.h:183
gzoffset64
long gzoffset64()
gz_state::in
unsigned char * in
Definition: gzguts.h:186
gz_error
void gz_error()
gz_state::err
int err
Definition: gzguts.h:201
gz_state
Definition: gzguts.h:174
OF
#define OF(args)
Definition: zconf.h:292
gz_state::start
long start
Definition: gzguts.h:191
gz_intmax
unsigned gz_intmax()
Definition: gzlib.c:626
gz_state::skip
long skip
Definition: gzguts.h:198
gz_state::strm
z_stream strm
Definition: gzguts.h:204
gz_state::want
unsigned want
Definition: gzguts.h:185
voidp
Byte * voidp
Definition: zconf.h:414
z_off64_t
#define z_off64_t
Definition: zconf.h:513
gz_state::mode
int mode
Definition: gzguts.h:181
FAR
#define FAR
Definition: zconf.h:387
voidpf
Byte * voidpf
Definition: zconf.h:413
gz_state::past
int past
Definition: gzguts.h:193
z_stream_s
Definition: zlib.h:86
gz_state::how
int how
Definition: gzguts.h:190
gz_state::level
int level
Definition: gzguts.h:195
ZLIB_INTERNAL
#define ZLIB_INTERNAL
Definition: gzguts.h:22
gz_state::seek
int seek
Definition: gzguts.h:199
gz_state::size
unsigned size
Definition: gzguts.h:184
gz_state::msg
char * msg
Definition: gzguts.h:202
gztell64
long gztell64()
malloc
voidp malloc()
ZEXPORT
#define ZEXPORT
Definition: zconf.h:380
uInt
unsigned int uInt
Definition: zconf.h:393
gz_state::direct
int direct
Definition: gzguts.h:188
gz_state::strategy
int strategy
Definition: gzguts.h:196
gzseek64
long gzseek64()
gz_state::out
unsigned char * out
Definition: gzguts.h:187
zlib.h