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author | Marcin Bukat <marcin.bukat@gmail.com> | 2010-10-31 12:40:49 +0000 |
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committer | Marcin Bukat <marcin.bukat@gmail.com> | 2010-10-31 12:40:49 +0000 |
commit | e26d0c62e07d1b1c1087a065242ed7ab1a2c522f (patch) | |
tree | b1e27ee113a94784233ca7aaf5b9d670f303b332 /apps/plugins/imageviewer/png/zlib.h | |
parent | c8901b3506ffb2f18798b005552c61b92b9d6a6c (diff) | |
download | rockbox-e26d0c62e07d1b1c1087a065242ed7ab1a2c522f.tar.gz rockbox-e26d0c62e07d1b1c1087a065242ed7ab1a2c522f.zip |
Fix and extend imageviewer png support. FS#11641 by me
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28413 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/plugins/imageviewer/png/zlib.h')
-rw-r--r-- | apps/plugins/imageviewer/png/zlib.h | 1357 |
1 files changed, 0 insertions, 1357 deletions
diff --git a/apps/plugins/imageviewer/png/zlib.h b/apps/plugins/imageviewer/png/zlib.h deleted file mode 100644 index 23e6dcd8f5..0000000000 --- a/apps/plugins/imageviewer/png/zlib.h +++ /dev/null | |||
@@ -1,1357 +0,0 @@ | |||
1 | /* zlib.h -- interface of the 'zlib' general purpose compression library | ||
2 | version 1.2.3, July 18th, 2005 | ||
3 | |||
4 | Copyright (C) 1995-2005 Jean-loup Gailly and Mark Adler | ||
5 | |||
6 | This software is provided 'as-is', without any express or implied | ||
7 | warranty. In no event will the authors be held liable for any damages | ||
8 | arising from the use of this software. | ||
9 | |||
10 | Permission is granted to anyone to use this software for any purpose, | ||
11 | including commercial applications, and to alter it and redistribute it | ||
12 | freely, subject to the following restrictions: | ||
13 | |||
14 | 1. The origin of this software must not be misrepresented; you must not | ||
15 | claim that you wrote the original software. If you use this software | ||
16 | in a product, an acknowledgment in the product documentation would be | ||
17 | appreciated but is not required. | ||
18 | 2. Altered source versions must be plainly marked as such, and must not be | ||
19 | misrepresented as being the original software. | ||
20 | 3. This notice may not be removed or altered from any source distribution. | ||
21 | |||
22 | Jean-loup Gailly Mark Adler | ||
23 | jloup@gzip.org madler@alumni.caltech.edu | ||
24 | |||
25 | |||
26 | The data format used by the zlib library is described by RFCs (Request for | ||
27 | Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt | ||
28 | (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format). | ||
29 | */ | ||
30 | |||
31 | #ifndef ZLIB_H | ||
32 | #define ZLIB_H | ||
33 | |||
34 | #include "zconf.h" | ||
35 | |||
36 | #ifdef __cplusplus | ||
37 | extern "C" { | ||
38 | #endif | ||
39 | |||
40 | #define ZLIB_VERSION "1.2.3" | ||
41 | #define ZLIB_VERNUM 0x1230 | ||
42 | |||
43 | /* | ||
44 | The 'zlib' compression library provides in-memory compression and | ||
45 | decompression functions, including integrity checks of the uncompressed | ||
46 | data. This version of the library supports only one compression method | ||
47 | (deflation) but other algorithms will be added later and will have the same | ||
48 | stream interface. | ||
49 | |||
50 | Compression can be done in a single step if the buffers are large | ||
51 | enough (for example if an input file is mmap'ed), or can be done by | ||
52 | repeated calls of the compression function. In the latter case, the | ||
53 | application must provide more input and/or consume the output | ||
54 | (providing more output space) before each call. | ||
55 | |||
56 | The compressed data format used by default by the in-memory functions is | ||
57 | the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped | ||
58 | around a deflate stream, which is itself documented in RFC 1951. | ||
59 | |||
60 | The library also supports reading and writing files in gzip (.gz) format | ||
61 | with an interface similar to that of stdio using the functions that start | ||
62 | with "gz". The gzip format is different from the zlib format. gzip is a | ||
63 | gzip wrapper, documented in RFC 1952, wrapped around a deflate stream. | ||
64 | |||
65 | This library can optionally read and write gzip streams in memory as well. | ||
66 | |||
67 | The zlib format was designed to be compact and fast for use in memory | ||
68 | and on communications channels. The gzip format was designed for single- | ||
69 | file compression on file systems, has a larger header than zlib to maintain | ||
70 | directory information, and uses a different, slower check method than zlib. | ||
71 | |||
72 | The library does not install any signal handler. The decoder checks | ||
73 | the consistency of the compressed data, so the library should never | ||
74 | crash even in case of corrupted input. | ||
75 | */ | ||
76 | |||
77 | typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size)); | ||
78 | typedef void (*free_func) OF((voidpf opaque, voidpf address)); | ||
79 | |||
80 | struct internal_state; | ||
81 | |||
82 | typedef struct z_stream_s { | ||
83 | Bytef *next_in; /* next input byte */ | ||
84 | uInt avail_in; /* number of bytes available at next_in */ | ||
85 | uLong total_in; /* total nb of input bytes read so far */ | ||
86 | |||
87 | Bytef *next_out; /* next output byte should be put there */ | ||
88 | uInt avail_out; /* remaining free space at next_out */ | ||
89 | uLong total_out; /* total nb of bytes output so far */ | ||
90 | |||
91 | char *msg; /* last error message, NULL if no error */ | ||
92 | //struct internal_state state; /* not visible by applications */ | ||
93 | |||
94 | alloc_func zalloc; /* used to allocate the internal state */ | ||
95 | free_func zfree; /* used to free the internal state */ | ||
96 | voidpf opaque; /* private data object passed to zalloc and zfree */ | ||
97 | |||
98 | int data_type; /* best guess about the data type: binary or text */ | ||
99 | uLong adler; /* adler32 value of the uncompressed data */ | ||
100 | uLong reserved; /* reserved for future use */ | ||
101 | } z_stream; | ||
102 | |||
103 | typedef z_stream FAR *z_streamp; | ||
104 | |||
105 | /* | ||
106 | gzip header information passed to and from zlib routines. See RFC 1952 | ||
107 | for more details on the meanings of these fields. | ||
108 | */ | ||
109 | typedef struct gz_header_s { | ||
110 | int text; /* true if compressed data believed to be text */ | ||
111 | uLong time; /* modification time */ | ||
112 | int xflags; /* extra flags (not used when writing a gzip file) */ | ||
113 | int os; /* operating system */ | ||
114 | Bytef *extra; /* pointer to extra field or Z_NULL if none */ | ||
115 | uInt extra_len; /* extra field length (valid if extra != Z_NULL) */ | ||
116 | uInt extra_max; /* space at extra (only when reading header) */ | ||
117 | Bytef *name; /* pointer to zero-terminated file name or Z_NULL */ | ||
118 | uInt name_max; /* space at name (only when reading header) */ | ||
119 | Bytef *comment; /* pointer to zero-terminated comment or Z_NULL */ | ||
120 | uInt comm_max; /* space at comment (only when reading header) */ | ||
121 | int hcrc; /* true if there was or will be a header crc */ | ||
122 | int done; /* true when done reading gzip header (not used | ||
123 | when writing a gzip file) */ | ||
124 | } gz_header; | ||
125 | |||
126 | typedef gz_header FAR *gz_headerp; | ||
127 | |||
128 | /* | ||
129 | The application must update next_in and avail_in when avail_in has | ||
130 | dropped to zero. It must update next_out and avail_out when avail_out | ||
131 | has dropped to zero. The application must initialize zalloc, zfree and | ||
132 | opaque before calling the init function. All other fields are set by the | ||
133 | compression library and must not be updated by the application. | ||
134 | |||
135 | The opaque value provided by the application will be passed as the first | ||
136 | parameter for calls of zalloc and zfree. This can be useful for custom | ||
137 | memory management. The compression library attaches no meaning to the | ||
138 | opaque value. | ||
139 | |||
140 | zalloc must return Z_NULL if there is not enough memory for the object. | ||
141 | If zlib is used in a multi-threaded application, zalloc and zfree must be | ||
142 | thread safe. | ||
143 | |||
144 | On 16-bit systems, the functions zalloc and zfree must be able to allocate | ||
145 | exactly 65536 bytes, but will not be required to allocate more than this | ||
146 | if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS, | ||
147 | pointers returned by zalloc for objects of exactly 65536 bytes *must* | ||
148 | have their offset normalized to zero. The default allocation function | ||
149 | provided by this library ensures this (see zutil.c). To reduce memory | ||
150 | requirements and avoid any allocation of 64K objects, at the expense of | ||
151 | compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h). | ||
152 | |||
153 | The fields total_in and total_out can be used for statistics or | ||
154 | progress reports. After compression, total_in holds the total size of | ||
155 | the uncompressed data and may be saved for use in the decompressor | ||
156 | (particularly if the decompressor wants to decompress everything in | ||
157 | a single step). | ||
158 | */ | ||
159 | |||
160 | /* constants */ | ||
161 | |||
162 | #define Z_NO_FLUSH 0 | ||
163 | #define Z_PARTIAL_FLUSH 1 /* will be removed, use Z_SYNC_FLUSH instead */ | ||
164 | #define Z_SYNC_FLUSH 2 | ||
165 | #define Z_FULL_FLUSH 3 | ||
166 | #define Z_FINISH 4 | ||
167 | #define Z_BLOCK 5 | ||
168 | /* Allowed flush values; see deflate() and inflate() below for details */ | ||
169 | |||
170 | #define Z_OK 0 | ||
171 | #define Z_STREAM_END 1 | ||
172 | #define Z_NEED_DICT 2 | ||
173 | #define Z_ERRNO (-1) | ||
174 | #define Z_STREAM_ERROR (-2) | ||
175 | #define Z_DATA_ERROR (-3) | ||
176 | #define Z_MEM_ERROR (-4) | ||
177 | #define Z_BUF_ERROR (-5) | ||
178 | #define Z_VERSION_ERROR (-6) | ||
179 | /* Return codes for the compression/decompression functions. Negative | ||
180 | * values are errors, positive values are used for special but normal events. | ||
181 | */ | ||
182 | |||
183 | #define Z_NO_COMPRESSION 0 | ||
184 | #define Z_BEST_SPEED 1 | ||
185 | #define Z_BEST_COMPRESSION 9 | ||
186 | #define Z_DEFAULT_COMPRESSION (-1) | ||
187 | /* compression levels */ | ||
188 | |||
189 | #define Z_FILTERED 1 | ||
190 | #define Z_HUFFMAN_ONLY 2 | ||
191 | #define Z_RLE 3 | ||
192 | #define Z_FIXED 4 | ||
193 | #define Z_DEFAULT_STRATEGY 0 | ||
194 | /* compression strategy; see deflateInit2() below for details */ | ||
195 | |||
196 | #define Z_BINARY 0 | ||
197 | #define Z_TEXT 1 | ||
198 | #define Z_ASCII Z_TEXT /* for compatibility with 1.2.2 and earlier */ | ||
199 | #define Z_UNKNOWN 2 | ||
200 | /* Possible values of the data_type field (though see inflate()) */ | ||
201 | |||
202 | #define Z_DEFLATED 8 | ||
203 | /* The deflate compression method (the only one supported in this version) */ | ||
204 | |||
205 | #define Z_NULL 0 /* for initializing zalloc, zfree, opaque */ | ||
206 | |||
207 | #define zlib_version zlibVersion() | ||
208 | /* for compatibility with versions < 1.0.2 */ | ||
209 | |||
210 | /* basic functions */ | ||
211 | |||
212 | ZEXTERN const char * ZEXPORT zlibVersion OF((void)); | ||
213 | /* The application can compare zlibVersion and ZLIB_VERSION for consistency. | ||
214 | If the first character differs, the library code actually used is | ||
215 | not compatible with the zlib.h header file used by the application. | ||
216 | This check is automatically made by deflateInit and inflateInit. | ||
217 | */ | ||
218 | |||
219 | /* | ||
220 | ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level)); | ||
221 | |||
222 | Initializes the internal stream state for compression. The fields | ||
223 | zalloc, zfree and opaque must be initialized before by the caller. | ||
224 | If zalloc and zfree are set to Z_NULL, deflateInit updates them to | ||
225 | use default allocation functions. | ||
226 | |||
227 | The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9: | ||
228 | 1 gives best speed, 9 gives best compression, 0 gives no compression at | ||
229 | all (the input data is simply copied a block at a time). | ||
230 | Z_DEFAULT_COMPRESSION requests a default compromise between speed and | ||
231 | compression (currently equivalent to level 6). | ||
232 | |||
233 | deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not | ||
234 | enough memory, Z_STREAM_ERROR if level is not a valid compression level, | ||
235 | Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible | ||
236 | with the version assumed by the caller (ZLIB_VERSION). | ||
237 | msg is set to null if there is no error message. deflateInit does not | ||
238 | perform any compression: this will be done by deflate(). | ||
239 | */ | ||
240 | |||
241 | |||
242 | ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush)); | ||
243 | /* | ||
244 | deflate compresses as much data as possible, and stops when the input | ||
245 | buffer becomes empty or the output buffer becomes full. It may introduce some | ||
246 | output latency (reading input without producing any output) except when | ||
247 | forced to flush. | ||
248 | |||
249 | The detailed semantics are as follows. deflate performs one or both of the | ||
250 | following actions: | ||
251 | |||
252 | - Compress more input starting at next_in and update next_in and avail_in | ||
253 | accordingly. If not all input can be processed (because there is not | ||
254 | enough room in the output buffer), next_in and avail_in are updated and | ||
255 | processing will resume at this point for the next call of deflate(). | ||
256 | |||
257 | - Provide more output starting at next_out and update next_out and avail_out | ||
258 | accordingly. This action is forced if the parameter flush is non zero. | ||
259 | Forcing flush frequently degrades the compression ratio, so this parameter | ||
260 | should be set only when necessary (in interactive applications). | ||
261 | Some output may be provided even if flush is not set. | ||
262 | |||
263 | Before the call of deflate(), the application should ensure that at least | ||
264 | one of the actions is possible, by providing more input and/or consuming | ||
265 | more output, and updating avail_in or avail_out accordingly; avail_out | ||
266 | should never be zero before the call. The application can consume the | ||
267 | compressed output when it wants, for example when the output buffer is full | ||
268 | (avail_out == 0), or after each call of deflate(). If deflate returns Z_OK | ||
269 | and with zero avail_out, it must be called again after making room in the | ||
270 | output buffer because there might be more output pending. | ||
271 | |||
272 | Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to | ||
273 | decide how much data to accumualte before producing output, in order to | ||
274 | maximize compression. | ||
275 | |||
276 | If the parameter flush is set to Z_SYNC_FLUSH, all pending output is | ||
277 | flushed to the output buffer and the output is aligned on a byte boundary, so | ||
278 | that the decompressor can get all input data available so far. (In particular | ||
279 | avail_in is zero after the call if enough output space has been provided | ||
280 | before the call.) Flushing may degrade compression for some compression | ||
281 | algorithms and so it should be used only when necessary. | ||
282 | |||
283 | If flush is set to Z_FULL_FLUSH, all output is flushed as with | ||
284 | Z_SYNC_FLUSH, and the compression state is reset so that decompression can | ||
285 | restart from this point if previous compressed data has been damaged or if | ||
286 | random access is desired. Using Z_FULL_FLUSH too often can seriously degrade | ||
287 | compression. | ||
288 | |||
289 | If deflate returns with avail_out == 0, this function must be called again | ||
290 | with the same value of the flush parameter and more output space (updated | ||
291 | avail_out), until the flush is complete (deflate returns with non-zero | ||
292 | avail_out). In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that | ||
293 | avail_out is greater than six to avoid repeated flush markers due to | ||
294 | avail_out == 0 on return. | ||
295 | |||
296 | If the parameter flush is set to Z_FINISH, pending input is processed, | ||
297 | pending output is flushed and deflate returns with Z_STREAM_END if there | ||
298 | was enough output space; if deflate returns with Z_OK, this function must be | ||
299 | called again with Z_FINISH and more output space (updated avail_out) but no | ||
300 | more input data, until it returns with Z_STREAM_END or an error. After | ||
301 | deflate has returned Z_STREAM_END, the only possible operations on the | ||
302 | stream are deflateReset or deflateEnd. | ||
303 | |||
304 | Z_FINISH can be used immediately after deflateInit if all the compression | ||
305 | is to be done in a single step. In this case, avail_out must be at least | ||
306 | the value returned by deflateBound (see below). If deflate does not return | ||
307 | Z_STREAM_END, then it must be called again as described above. | ||
308 | |||
309 | deflate() sets strm->adler to the adler32 checksum of all input read | ||
310 | so far (that is, total_in bytes). | ||
311 | |||
312 | deflate() may update strm->data_type if it can make a good guess about | ||
313 | the input data type (Z_BINARY or Z_TEXT). In doubt, the data is considered | ||
314 | binary. This field is only for information purposes and does not affect | ||
315 | the compression algorithm in any manner. | ||
316 | |||
317 | deflate() returns Z_OK if some progress has been made (more input | ||
318 | processed or more output produced), Z_STREAM_END if all input has been | ||
319 | consumed and all output has been produced (only when flush is set to | ||
320 | Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example | ||
321 | if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible | ||
322 | (for example avail_in or avail_out was zero). Note that Z_BUF_ERROR is not | ||
323 | fatal, and deflate() can be called again with more input and more output | ||
324 | space to continue compressing. | ||
325 | */ | ||
326 | |||
327 | |||
328 | ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm)); | ||
329 | /* | ||
330 | All dynamically allocated data structures for this stream are freed. | ||
331 | This function discards any unprocessed input and does not flush any | ||
332 | pending output. | ||
333 | |||
334 | deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the | ||
335 | stream state was inconsistent, Z_DATA_ERROR if the stream was freed | ||
336 | prematurely (some input or output was discarded). In the error case, | ||
337 | msg may be set but then points to a static string (which must not be | ||
338 | deallocated). | ||
339 | */ | ||
340 | |||
341 | |||
342 | /* | ||
343 | ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm)); | ||
344 | |||
345 | Initializes the internal stream state for decompression. The fields | ||
346 | next_in, avail_in, zalloc, zfree and opaque must be initialized before by | ||
347 | the caller. If next_in is not Z_NULL and avail_in is large enough (the exact | ||
348 | value depends on the compression method), inflateInit determines the | ||
349 | compression method from the zlib header and allocates all data structures | ||
350 | accordingly; otherwise the allocation will be deferred to the first call of | ||
351 | inflate. If zalloc and zfree are set to Z_NULL, inflateInit updates them to | ||
352 | use default allocation functions. | ||
353 | |||
354 | inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough | ||
355 | memory, Z_VERSION_ERROR if the zlib library version is incompatible with the | ||
356 | version assumed by the caller. msg is set to null if there is no error | ||
357 | message. inflateInit does not perform any decompression apart from reading | ||
358 | the zlib header if present: this will be done by inflate(). (So next_in and | ||
359 | avail_in may be modified, but next_out and avail_out are unchanged.) | ||
360 | */ | ||
361 | |||
362 | |||
363 | ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush)); | ||
364 | /* | ||
365 | inflate decompresses as much data as possible, and stops when the input | ||
366 | buffer becomes empty or the output buffer becomes full. It may introduce | ||
367 | some output latency (reading input without producing any output) except when | ||
368 | forced to flush. | ||
369 | |||
370 | The detailed semantics are as follows. inflate performs one or both of the | ||
371 | following actions: | ||
372 | |||
373 | - Decompress more input starting at next_in and update next_in and avail_in | ||
374 | accordingly. If not all input can be processed (because there is not | ||
375 | enough room in the output buffer), next_in is updated and processing | ||
376 | will resume at this point for the next call of inflate(). | ||
377 | |||
378 | - Provide more output starting at next_out and update next_out and avail_out | ||
379 | accordingly. inflate() provides as much output as possible, until there | ||
380 | is no more input data or no more space in the output buffer (see below | ||
381 | about the flush parameter). | ||
382 | |||
383 | Before the call of inflate(), the application should ensure that at least | ||
384 | one of the actions is possible, by providing more input and/or consuming | ||
385 | more output, and updating the next_* and avail_* values accordingly. | ||
386 | The application can consume the uncompressed output when it wants, for | ||
387 | example when the output buffer is full (avail_out == 0), or after each | ||
388 | call of inflate(). If inflate returns Z_OK and with zero avail_out, it | ||
389 | must be called again after making room in the output buffer because there | ||
390 | might be more output pending. | ||
391 | |||
392 | The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH, | ||
393 | Z_FINISH, or Z_BLOCK. Z_SYNC_FLUSH requests that inflate() flush as much | ||
394 | output as possible to the output buffer. Z_BLOCK requests that inflate() stop | ||
395 | if and when it gets to the next deflate block boundary. When decoding the | ||
396 | zlib or gzip format, this will cause inflate() to return immediately after | ||
397 | the header and before the first block. When doing a raw inflate, inflate() | ||
398 | will go ahead and process the first block, and will return when it gets to | ||
399 | the end of that block, or when it runs out of data. | ||
400 | |||
401 | The Z_BLOCK option assists in appending to or combining deflate streams. | ||
402 | Also to assist in this, on return inflate() will set strm->data_type to the | ||
403 | number of unused bits in the last byte taken from strm->next_in, plus 64 | ||
404 | if inflate() is currently decoding the last block in the deflate stream, | ||
405 | plus 128 if inflate() returned immediately after decoding an end-of-block | ||
406 | code or decoding the complete header up to just before the first byte of the | ||
407 | deflate stream. The end-of-block will not be indicated until all of the | ||
408 | uncompressed data from that block has been written to strm->next_out. The | ||
409 | number of unused bits may in general be greater than seven, except when | ||
410 | bit 7 of data_type is set, in which case the number of unused bits will be | ||
411 | less than eight. | ||
412 | |||
413 | inflate() should normally be called until it returns Z_STREAM_END or an | ||
414 | error. However if all decompression is to be performed in a single step | ||
415 | (a single call of inflate), the parameter flush should be set to | ||
416 | Z_FINISH. In this case all pending input is processed and all pending | ||
417 | output is flushed; avail_out must be large enough to hold all the | ||
418 | uncompressed data. (The size of the uncompressed data may have been saved | ||
419 | by the compressor for this purpose.) The next operation on this stream must | ||
420 | be inflateEnd to deallocate the decompression state. The use of Z_FINISH | ||
421 | is never required, but can be used to inform inflate that a faster approach | ||
422 | may be used for the single inflate() call. | ||
423 | |||
424 | In this implementation, inflate() always flushes as much output as | ||
425 | possible to the output buffer, and always uses the faster approach on the | ||
426 | first call. So the only effect of the flush parameter in this implementation | ||
427 | is on the return value of inflate(), as noted below, or when it returns early | ||
428 | because Z_BLOCK is used. | ||
429 | |||
430 | If a preset dictionary is needed after this call (see inflateSetDictionary | ||
431 | below), inflate sets strm->adler to the adler32 checksum of the dictionary | ||
432 | chosen by the compressor and returns Z_NEED_DICT; otherwise it sets | ||
433 | strm->adler to the adler32 checksum of all output produced so far (that is, | ||
434 | total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described | ||
435 | below. At the end of the stream, inflate() checks that its computed adler32 | ||
436 | checksum is equal to that saved by the compressor and returns Z_STREAM_END | ||
437 | only if the checksum is correct. | ||
438 | |||
439 | inflate() will decompress and check either zlib-wrapped or gzip-wrapped | ||
440 | deflate data. The header type is detected automatically. Any information | ||
441 | contained in the gzip header is not retained, so applications that need that | ||
442 | information should instead use raw inflate, see inflateInit2() below, or | ||
443 | inflateBack() and perform their own processing of the gzip header and | ||
444 | trailer. | ||
445 | |||
446 | inflate() returns Z_OK if some progress has been made (more input processed | ||
447 | or more output produced), Z_STREAM_END if the end of the compressed data has | ||
448 | been reached and all uncompressed output has been produced, Z_NEED_DICT if a | ||
449 | preset dictionary is needed at this point, Z_DATA_ERROR if the input data was | ||
450 | corrupted (input stream not conforming to the zlib format or incorrect check | ||
451 | value), Z_STREAM_ERROR if the stream structure was inconsistent (for example | ||
452 | if next_in or next_out was NULL), Z_MEM_ERROR if there was not enough memory, | ||
453 | Z_BUF_ERROR if no progress is possible or if there was not enough room in the | ||
454 | output buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and | ||
455 | inflate() can be called again with more input and more output space to | ||
456 | continue decompressing. If Z_DATA_ERROR is returned, the application may then | ||
457 | call inflateSync() to look for a good compression block if a partial recovery | ||
458 | of the data is desired. | ||
459 | */ | ||
460 | |||
461 | |||
462 | ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm)); | ||
463 | /* | ||
464 | All dynamically allocated data structures for this stream are freed. | ||
465 | This function discards any unprocessed input and does not flush any | ||
466 | pending output. | ||
467 | |||
468 | inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state | ||
469 | was inconsistent. In the error case, msg may be set but then points to a | ||
470 | static string (which must not be deallocated). | ||
471 | */ | ||
472 | |||
473 | /* Advanced functions */ | ||
474 | |||
475 | /* | ||
476 | The following functions are needed only in some special applications. | ||
477 | */ | ||
478 | |||
479 | /* | ||
480 | ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm, | ||
481 | int level, | ||
482 | int method, | ||
483 | int windowBits, | ||
484 | int memLevel, | ||
485 | int strategy)); | ||
486 | |||
487 | This is another version of deflateInit with more compression options. The | ||
488 | fields next_in, zalloc, zfree and opaque must be initialized before by | ||
489 | the caller. | ||
490 | |||
491 | The method parameter is the compression method. It must be Z_DEFLATED in | ||
492 | this version of the library. | ||
493 | |||
494 | The windowBits parameter is the base two logarithm of the window size | ||
495 | (the size of the history buffer). It should be in the range 8..15 for this | ||
496 | version of the library. Larger values of this parameter result in better | ||
497 | compression at the expense of memory usage. The default value is 15 if | ||
498 | deflateInit is used instead. | ||
499 | |||
500 | windowBits can also be -8..-15 for raw deflate. In this case, -windowBits | ||
501 | determines the window size. deflate() will then generate raw deflate data | ||
502 | with no zlib header or trailer, and will not compute an adler32 check value. | ||
503 | |||
504 | windowBits can also be greater than 15 for optional gzip encoding. Add | ||
505 | 16 to windowBits to write a simple gzip header and trailer around the | ||
506 | compressed data instead of a zlib wrapper. The gzip header will have no | ||
507 | file name, no extra data, no comment, no modification time (set to zero), | ||
508 | no header crc, and the operating system will be set to 255 (unknown). If a | ||
509 | gzip stream is being written, strm->adler is a crc32 instead of an adler32. | ||
510 | |||
511 | The memLevel parameter specifies how much memory should be allocated | ||
512 | for the internal compression state. memLevel=1 uses minimum memory but | ||
513 | is slow and reduces compression ratio; memLevel=9 uses maximum memory | ||
514 | for optimal speed. The default value is 8. See zconf.h for total memory | ||
515 | usage as a function of windowBits and memLevel. | ||
516 | |||
517 | The strategy parameter is used to tune the compression algorithm. Use the | ||
518 | value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a | ||
519 | filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no | ||
520 | string match), or Z_RLE to limit match distances to one (run-length | ||
521 | encoding). Filtered data consists mostly of small values with a somewhat | ||
522 | random distribution. In this case, the compression algorithm is tuned to | ||
523 | compress them better. The effect of Z_FILTERED is to force more Huffman | ||
524 | coding and less string matching; it is somewhat intermediate between | ||
525 | Z_DEFAULT and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as fast as | ||
526 | Z_HUFFMAN_ONLY, but give better compression for PNG image data. The strategy | ||
527 | parameter only affects the compression ratio but not the correctness of the | ||
528 | compressed output even if it is not set appropriately. Z_FIXED prevents the | ||
529 | use of dynamic Huffman codes, allowing for a simpler decoder for special | ||
530 | applications. | ||
531 | |||
532 | deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough | ||
533 | memory, Z_STREAM_ERROR if a parameter is invalid (such as an invalid | ||
534 | method). msg is set to null if there is no error message. deflateInit2 does | ||
535 | not perform any compression: this will be done by deflate(). | ||
536 | */ | ||
537 | |||
538 | ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm, | ||
539 | const Bytef *dictionary, | ||
540 | uInt dictLength)); | ||
541 | /* | ||
542 | Initializes the compression dictionary from the given byte sequence | ||
543 | without producing any compressed output. This function must be called | ||
544 | immediately after deflateInit, deflateInit2 or deflateReset, before any | ||
545 | call of deflate. The compressor and decompressor must use exactly the same | ||
546 | dictionary (see inflateSetDictionary). | ||
547 | |||
548 | The dictionary should consist of strings (byte sequences) that are likely | ||
549 | to be encountered later in the data to be compressed, with the most commonly | ||
550 | used strings preferably put towards the end of the dictionary. Using a | ||
551 | dictionary is most useful when the data to be compressed is short and can be | ||
552 | predicted with good accuracy; the data can then be compressed better than | ||
553 | with the default empty dictionary. | ||
554 | |||
555 | Depending on the size of the compression data structures selected by | ||
556 | deflateInit or deflateInit2, a part of the dictionary may in effect be | ||
557 | discarded, for example if the dictionary is larger than the window size in | ||
558 | deflate or deflate2. Thus the strings most likely to be useful should be | ||
559 | put at the end of the dictionary, not at the front. In addition, the | ||
560 | current implementation of deflate will use at most the window size minus | ||
561 | 262 bytes of the provided dictionary. | ||
562 | |||
563 | Upon return of this function, strm->adler is set to the adler32 value | ||
564 | of the dictionary; the decompressor may later use this value to determine | ||
565 | which dictionary has been used by the compressor. (The adler32 value | ||
566 | applies to the whole dictionary even if only a subset of the dictionary is | ||
567 | actually used by the compressor.) If a raw deflate was requested, then the | ||
568 | adler32 value is not computed and strm->adler is not set. | ||
569 | |||
570 | deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a | ||
571 | parameter is invalid (such as NULL dictionary) or the stream state is | ||
572 | inconsistent (for example if deflate has already been called for this stream | ||
573 | or if the compression method is bsort). deflateSetDictionary does not | ||
574 | perform any compression: this will be done by deflate(). | ||
575 | */ | ||
576 | |||
577 | ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest, | ||
578 | z_streamp source)); | ||
579 | /* | ||
580 | Sets the destination stream as a complete copy of the source stream. | ||
581 | |||
582 | This function can be useful when several compression strategies will be | ||
583 | tried, for example when there are several ways of pre-processing the input | ||
584 | data with a filter. The streams that will be discarded should then be freed | ||
585 | by calling deflateEnd. Note that deflateCopy duplicates the internal | ||
586 | compression state which can be quite large, so this strategy is slow and | ||
587 | can consume lots of memory. | ||
588 | |||
589 | deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not | ||
590 | enough memory, Z_STREAM_ERROR if the source stream state was inconsistent | ||
591 | (such as zalloc being NULL). msg is left unchanged in both source and | ||
592 | destination. | ||
593 | */ | ||
594 | |||
595 | ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm)); | ||
596 | /* | ||
597 | This function is equivalent to deflateEnd followed by deflateInit, | ||
598 | but does not free and reallocate all the internal compression state. | ||
599 | The stream will keep the same compression level and any other attributes | ||
600 | that may have been set by deflateInit2. | ||
601 | |||
602 | deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source | ||
603 | stream state was inconsistent (such as zalloc or state being NULL). | ||
604 | */ | ||
605 | |||
606 | ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm, | ||
607 | int level, | ||
608 | int strategy)); | ||
609 | /* | ||
610 | Dynamically update the compression level and compression strategy. The | ||
611 | interpretation of level and strategy is as in deflateInit2. This can be | ||
612 | used to switch between compression and straight copy of the input data, or | ||
613 | to switch to a different kind of input data requiring a different | ||
614 | strategy. If the compression level is changed, the input available so far | ||
615 | is compressed with the old level (and may be flushed); the new level will | ||
616 | take effect only at the next call of deflate(). | ||
617 | |||
618 | Before the call of deflateParams, the stream state must be set as for | ||
619 | a call of deflate(), since the currently available input may have to | ||
620 | be compressed and flushed. In particular, strm->avail_out must be non-zero. | ||
621 | |||
622 | deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source | ||
623 | stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR | ||
624 | if strm->avail_out was zero. | ||
625 | */ | ||
626 | |||
627 | ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm, | ||
628 | int good_length, | ||
629 | int max_lazy, | ||
630 | int nice_length, | ||
631 | int max_chain)); | ||
632 | /* | ||
633 | Fine tune deflate's internal compression parameters. This should only be | ||
634 | used by someone who understands the algorithm used by zlib's deflate for | ||
635 | searching for the best matching string, and even then only by the most | ||
636 | fanatic optimizer trying to squeeze out the last compressed bit for their | ||
637 | specific input data. Read the deflate.c source code for the meaning of the | ||
638 | max_lazy, good_length, nice_length, and max_chain parameters. | ||
639 | |||
640 | deflateTune() can be called after deflateInit() or deflateInit2(), and | ||
641 | returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream. | ||
642 | */ | ||
643 | |||
644 | ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm, | ||
645 | uLong sourceLen)); | ||
646 | /* | ||
647 | deflateBound() returns an upper bound on the compressed size after | ||
648 | deflation of sourceLen bytes. It must be called after deflateInit() | ||
649 | or deflateInit2(). This would be used to allocate an output buffer | ||
650 | for deflation in a single pass, and so would be called before deflate(). | ||
651 | */ | ||
652 | |||
653 | ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm, | ||
654 | int bits, | ||
655 | int value)); | ||
656 | /* | ||
657 | deflatePrime() inserts bits in the deflate output stream. The intent | ||
658 | is that this function is used to start off the deflate output with the | ||
659 | bits leftover from a previous deflate stream when appending to it. As such, | ||
660 | this function can only be used for raw deflate, and must be used before the | ||
661 | first deflate() call after a deflateInit2() or deflateReset(). bits must be | ||
662 | less than or equal to 16, and that many of the least significant bits of | ||
663 | value will be inserted in the output. | ||
664 | |||
665 | deflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source | ||
666 | stream state was inconsistent. | ||
667 | */ | ||
668 | |||
669 | ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm, | ||
670 | gz_headerp head)); | ||
671 | /* | ||
672 | deflateSetHeader() provides gzip header information for when a gzip | ||
673 | stream is requested by deflateInit2(). deflateSetHeader() may be called | ||
674 | after deflateInit2() or deflateReset() and before the first call of | ||
675 | deflate(). The text, time, os, extra field, name, and comment information | ||
676 | in the provided gz_header structure are written to the gzip header (xflag is | ||
677 | ignored -- the extra flags are set according to the compression level). The | ||
678 | caller must assure that, if not Z_NULL, name and comment are terminated with | ||
679 | a zero byte, and that if extra is not Z_NULL, that extra_len bytes are | ||
680 | available there. If hcrc is true, a gzip header crc is included. Note that | ||
681 | the current versions of the command-line version of gzip (up through version | ||
682 | 1.3.x) do not support header crc's, and will report that it is a "multi-part | ||
683 | gzip file" and give up. | ||
684 | |||
685 | If deflateSetHeader is not used, the default gzip header has text false, | ||
686 | the time set to zero, and os set to 255, with no extra, name, or comment | ||
687 | fields. The gzip header is returned to the default state by deflateReset(). | ||
688 | |||
689 | deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source | ||
690 | stream state was inconsistent. | ||
691 | */ | ||
692 | |||
693 | /* | ||
694 | ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm, | ||
695 | int windowBits)); | ||
696 | |||
697 | This is another version of inflateInit with an extra parameter. The | ||
698 | fields next_in, avail_in, zalloc, zfree and opaque must be initialized | ||
699 | before by the caller. | ||
700 | |||
701 | The windowBits parameter is the base two logarithm of the maximum window | ||
702 | size (the size of the history buffer). It should be in the range 8..15 for | ||
703 | this version of the library. The default value is 15 if inflateInit is used | ||
704 | instead. windowBits must be greater than or equal to the windowBits value | ||
705 | provided to deflateInit2() while compressing, or it must be equal to 15 if | ||
706 | deflateInit2() was not used. If a compressed stream with a larger window | ||
707 | size is given as input, inflate() will return with the error code | ||
708 | Z_DATA_ERROR instead of trying to allocate a larger window. | ||
709 | |||
710 | windowBits can also be -8..-15 for raw inflate. In this case, -windowBits | ||
711 | determines the window size. inflate() will then process raw deflate data, | ||
712 | not looking for a zlib or gzip header, not generating a check value, and not | ||
713 | looking for any check values for comparison at the end of the stream. This | ||
714 | is for use with other formats that use the deflate compressed data format | ||
715 | such as zip. Those formats provide their own check values. If a custom | ||
716 | format is developed using the raw deflate format for compressed data, it is | ||
717 | recommended that a check value such as an adler32 or a crc32 be applied to | ||
718 | the uncompressed data as is done in the zlib, gzip, and zip formats. For | ||
719 | most applications, the zlib format should be used as is. Note that comments | ||
720 | above on the use in deflateInit2() applies to the magnitude of windowBits. | ||
721 | |||
722 | windowBits can also be greater than 15 for optional gzip decoding. Add | ||
723 | 32 to windowBits to enable zlib and gzip decoding with automatic header | ||
724 | detection, or add 16 to decode only the gzip format (the zlib format will | ||
725 | return a Z_DATA_ERROR). If a gzip stream is being decoded, strm->adler is | ||
726 | a crc32 instead of an adler32. | ||
727 | |||
728 | inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough | ||
729 | memory, Z_STREAM_ERROR if a parameter is invalid (such as a null strm). msg | ||
730 | is set to null if there is no error message. inflateInit2 does not perform | ||
731 | any decompression apart from reading the zlib header if present: this will | ||
732 | be done by inflate(). (So next_in and avail_in may be modified, but next_out | ||
733 | and avail_out are unchanged.) | ||
734 | */ | ||
735 | |||
736 | ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm, | ||
737 | const Bytef *dictionary, | ||
738 | uInt dictLength)); | ||
739 | /* | ||
740 | Initializes the decompression dictionary from the given uncompressed byte | ||
741 | sequence. This function must be called immediately after a call of inflate, | ||
742 | if that call returned Z_NEED_DICT. The dictionary chosen by the compressor | ||
743 | can be determined from the adler32 value returned by that call of inflate. | ||
744 | The compressor and decompressor must use exactly the same dictionary (see | ||
745 | deflateSetDictionary). For raw inflate, this function can be called | ||
746 | immediately after inflateInit2() or inflateReset() and before any call of | ||
747 | inflate() to set the dictionary. The application must insure that the | ||
748 | dictionary that was used for compression is provided. | ||
749 | |||
750 | inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a | ||
751 | parameter is invalid (such as NULL dictionary) or the stream state is | ||
752 | inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the | ||
753 | expected one (incorrect adler32 value). inflateSetDictionary does not | ||
754 | perform any decompression: this will be done by subsequent calls of | ||
755 | inflate(). | ||
756 | */ | ||
757 | |||
758 | ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm)); | ||
759 | /* | ||
760 | Skips invalid compressed data until a full flush point (see above the | ||
761 | description of deflate with Z_FULL_FLUSH) can be found, or until all | ||
762 | available input is skipped. No output is provided. | ||
763 | |||
764 | inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR | ||
765 | if no more input was provided, Z_DATA_ERROR if no flush point has been found, | ||
766 | or Z_STREAM_ERROR if the stream structure was inconsistent. In the success | ||
767 | case, the application may save the current current value of total_in which | ||
768 | indicates where valid compressed data was found. In the error case, the | ||
769 | application may repeatedly call inflateSync, providing more input each time, | ||
770 | until success or end of the input data. | ||
771 | */ | ||
772 | |||
773 | ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest, | ||
774 | z_streamp source)); | ||
775 | /* | ||
776 | Sets the destination stream as a complete copy of the source stream. | ||
777 | |||
778 | This function can be useful when randomly accessing a large stream. The | ||
779 | first pass through the stream can periodically record the inflate state, | ||
780 | allowing restarting inflate at those points when randomly accessing the | ||
781 | stream. | ||
782 | |||
783 | inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not | ||
784 | enough memory, Z_STREAM_ERROR if the source stream state was inconsistent | ||
785 | (such as zalloc being NULL). msg is left unchanged in both source and | ||
786 | destination. | ||
787 | */ | ||
788 | |||
789 | ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm)); | ||
790 | /* | ||
791 | This function is equivalent to inflateEnd followed by inflateInit, | ||
792 | but does not free and reallocate all the internal decompression state. | ||
793 | The stream will keep attributes that may have been set by inflateInit2. | ||
794 | |||
795 | inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source | ||
796 | stream state was inconsistent (such as zalloc or state being NULL). | ||
797 | */ | ||
798 | |||
799 | ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm, | ||
800 | int bits, | ||
801 | int value)); | ||
802 | /* | ||
803 | This function inserts bits in the inflate input stream. The intent is | ||
804 | that this function is used to start inflating at a bit position in the | ||
805 | middle of a byte. The provided bits will be used before any bytes are used | ||
806 | from next_in. This function should only be used with raw inflate, and | ||
807 | should be used before the first inflate() call after inflateInit2() or | ||
808 | inflateReset(). bits must be less than or equal to 16, and that many of the | ||
809 | least significant bits of value will be inserted in the input. | ||
810 | |||
811 | inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source | ||
812 | stream state was inconsistent. | ||
813 | */ | ||
814 | |||
815 | ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm, | ||
816 | gz_headerp head)); | ||
817 | /* | ||
818 | inflateGetHeader() requests that gzip header information be stored in the | ||
819 | provided gz_header structure. inflateGetHeader() may be called after | ||
820 | inflateInit2() or inflateReset(), and before the first call of inflate(). | ||
821 | As inflate() processes the gzip stream, head->done is zero until the header | ||
822 | is completed, at which time head->done is set to one. If a zlib stream is | ||
823 | being decoded, then head->done is set to -1 to indicate that there will be | ||
824 | no gzip header information forthcoming. Note that Z_BLOCK can be used to | ||
825 | force inflate() to return immediately after header processing is complete | ||
826 | and before any actual data is decompressed. | ||
827 | |||
828 | The text, time, xflags, and os fields are filled in with the gzip header | ||
829 | contents. hcrc is set to true if there is a header CRC. (The header CRC | ||
830 | was valid if done is set to one.) If extra is not Z_NULL, then extra_max | ||
831 | contains the maximum number of bytes to write to extra. Once done is true, | ||
832 | extra_len contains the actual extra field length, and extra contains the | ||
833 | extra field, or that field truncated if extra_max is less than extra_len. | ||
834 | If name is not Z_NULL, then up to name_max characters are written there, | ||
835 | terminated with a zero unless the length is greater than name_max. If | ||
836 | comment is not Z_NULL, then up to comm_max characters are written there, | ||
837 | terminated with a zero unless the length is greater than comm_max. When | ||
838 | any of extra, name, or comment are not Z_NULL and the respective field is | ||
839 | not present in the header, then that field is set to Z_NULL to signal its | ||
840 | absence. This allows the use of deflateSetHeader() with the returned | ||
841 | structure to duplicate the header. However if those fields are set to | ||
842 | allocated memory, then the application will need to save those pointers | ||
843 | elsewhere so that they can be eventually freed. | ||
844 | |||
845 | If inflateGetHeader is not used, then the header information is simply | ||
846 | discarded. The header is always checked for validity, including the header | ||
847 | CRC if present. inflateReset() will reset the process to discard the header | ||
848 | information. The application would need to call inflateGetHeader() again to | ||
849 | retrieve the header from the next gzip stream. | ||
850 | |||
851 | inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source | ||
852 | stream state was inconsistent. | ||
853 | */ | ||
854 | |||
855 | /* | ||
856 | ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits, | ||
857 | unsigned char FAR *window)); | ||
858 | |||
859 | Initialize the internal stream state for decompression using inflateBack() | ||
860 | calls. The fields zalloc, zfree and opaque in strm must be initialized | ||
861 | before the call. If zalloc and zfree are Z_NULL, then the default library- | ||
862 | derived memory allocation routines are used. windowBits is the base two | ||
863 | logarithm of the window size, in the range 8..15. window is a caller | ||
864 | supplied buffer of that size. Except for special applications where it is | ||
865 | assured that deflate was used with small window sizes, windowBits must be 15 | ||
866 | and a 32K byte window must be supplied to be able to decompress general | ||
867 | deflate streams. | ||
868 | |||
869 | See inflateBack() for the usage of these routines. | ||
870 | |||
871 | inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of | ||
872 | the paramaters are invalid, Z_MEM_ERROR if the internal state could not | ||
873 | be allocated, or Z_VERSION_ERROR if the version of the library does not | ||
874 | match the version of the header file. | ||
875 | */ | ||
876 | |||
877 | typedef unsigned (*in_func) OF((void FAR *, unsigned char FAR * FAR *)); | ||
878 | typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned)); | ||
879 | |||
880 | ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm, | ||
881 | in_func in, void FAR *in_desc, | ||
882 | out_func out, void FAR *out_desc)); | ||
883 | /* | ||
884 | inflateBack() does a raw inflate with a single call using a call-back | ||
885 | interface for input and output. This is more efficient than inflate() for | ||
886 | file i/o applications in that it avoids copying between the output and the | ||
887 | sliding window by simply making the window itself the output buffer. This | ||
888 | function trusts the application to not change the output buffer passed by | ||
889 | the output function, at least until inflateBack() returns. | ||
890 | |||
891 | inflateBackInit() must be called first to allocate the internal state | ||
892 | and to initialize the state with the user-provided window buffer. | ||
893 | inflateBack() may then be used multiple times to inflate a complete, raw | ||
894 | deflate stream with each call. inflateBackEnd() is then called to free | ||
895 | the allocated state. | ||
896 | |||
897 | A raw deflate stream is one with no zlib or gzip header or trailer. | ||
898 | This routine would normally be used in a utility that reads zip or gzip | ||
899 | files and writes out uncompressed files. The utility would decode the | ||
900 | header and process the trailer on its own, hence this routine expects | ||
901 | only the raw deflate stream to decompress. This is different from the | ||
902 | normal behavior of inflate(), which expects either a zlib or gzip header and | ||
903 | trailer around the deflate stream. | ||
904 | |||
905 | inflateBack() uses two subroutines supplied by the caller that are then | ||
906 | called by inflateBack() for input and output. inflateBack() calls those | ||
907 | routines until it reads a complete deflate stream and writes out all of the | ||
908 | uncompressed data, or until it encounters an error. The function's | ||
909 | parameters and return types are defined above in the in_func and out_func | ||
910 | typedefs. inflateBack() will call in(in_desc, &buf) which should return the | ||
911 | number of bytes of provided input, and a pointer to that input in buf. If | ||
912 | there is no input available, in() must return zero--buf is ignored in that | ||
913 | case--and inflateBack() will return a buffer error. inflateBack() will call | ||
914 | out(out_desc, buf, len) to write the uncompressed data buf[0..len-1]. out() | ||
915 | should return zero on success, or non-zero on failure. If out() returns | ||
916 | non-zero, inflateBack() will return with an error. Neither in() nor out() | ||
917 | are permitted to change the contents of the window provided to | ||
918 | inflateBackInit(), which is also the buffer that out() uses to write from. | ||
919 | The length written by out() will be at most the window size. Any non-zero | ||
920 | amount of input may be provided by in(). | ||
921 | |||
922 | For convenience, inflateBack() can be provided input on the first call by | ||
923 | setting strm->next_in and strm->avail_in. If that input is exhausted, then | ||
924 | in() will be called. Therefore strm->next_in must be initialized before | ||
925 | calling inflateBack(). If strm->next_in is Z_NULL, then in() will be called | ||
926 | immediately for input. If strm->next_in is not Z_NULL, then strm->avail_in | ||
927 | must also be initialized, and then if strm->avail_in is not zero, input will | ||
928 | initially be taken from strm->next_in[0 .. strm->avail_in - 1]. | ||
929 | |||
930 | The in_desc and out_desc parameters of inflateBack() is passed as the | ||
931 | first parameter of in() and out() respectively when they are called. These | ||
932 | descriptors can be optionally used to pass any information that the caller- | ||
933 | supplied in() and out() functions need to do their job. | ||
934 | |||
935 | On return, inflateBack() will set strm->next_in and strm->avail_in to | ||
936 | pass back any unused input that was provided by the last in() call. The | ||
937 | return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR | ||
938 | if in() or out() returned an error, Z_DATA_ERROR if there was a format | ||
939 | error in the deflate stream (in which case strm->msg is set to indicate the | ||
940 | nature of the error), or Z_STREAM_ERROR if the stream was not properly | ||
941 | initialized. In the case of Z_BUF_ERROR, an input or output error can be | ||
942 | distinguished using strm->next_in which will be Z_NULL only if in() returned | ||
943 | an error. If strm->next is not Z_NULL, then the Z_BUF_ERROR was due to | ||
944 | out() returning non-zero. (in() will always be called before out(), so | ||
945 | strm->next_in is assured to be defined if out() returns non-zero.) Note | ||
946 | that inflateBack() cannot return Z_OK. | ||
947 | */ | ||
948 | |||
949 | ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm)); | ||
950 | /* | ||
951 | All memory allocated by inflateBackInit() is freed. | ||
952 | |||
953 | inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream | ||
954 | state was inconsistent. | ||
955 | */ | ||
956 | |||
957 | ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void)); | ||
958 | /* Return flags indicating compile-time options. | ||
959 | |||
960 | Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other: | ||
961 | 1.0: size of uInt | ||
962 | 3.2: size of uLong | ||
963 | 5.4: size of voidpf (pointer) | ||
964 | 7.6: size of z_off_t | ||
965 | |||
966 | Compiler, assembler, and debug options: | ||
967 | 8: DEBUG | ||
968 | 9: ASMV or ASMINF -- use ASM code | ||
969 | 10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention | ||
970 | 11: 0 (reserved) | ||
971 | |||
972 | One-time table building (smaller code, but not thread-safe if true): | ||
973 | 12: BUILDFIXED -- build static block decoding tables when needed | ||
974 | 13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed | ||
975 | 14,15: 0 (reserved) | ||
976 | |||
977 | Library content (indicates missing functionality): | ||
978 | 16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking | ||
979 | deflate code when not needed) | ||
980 | 17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect | ||
981 | and decode gzip streams (to avoid linking crc code) | ||
982 | 18-19: 0 (reserved) | ||
983 | |||
984 | Operation variations (changes in library functionality): | ||
985 | 20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate | ||
986 | 21: FASTEST -- deflate algorithm with only one, lowest compression level | ||
987 | 22,23: 0 (reserved) | ||
988 | |||
989 | The sprintf variant used by gzprintf (zero is best): | ||
990 | 24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format | ||
991 | 25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure! | ||
992 | 26: 0 = returns value, 1 = void -- 1 means inferred string length returned | ||
993 | |||
994 | Remainder: | ||
995 | 27-31: 0 (reserved) | ||
996 | */ | ||
997 | |||
998 | |||
999 | /* utility functions */ | ||
1000 | |||
1001 | /* | ||
1002 | The following utility functions are implemented on top of the | ||
1003 | basic stream-oriented functions. To simplify the interface, some | ||
1004 | default options are assumed (compression level and memory usage, | ||
1005 | standard memory allocation functions). The source code of these | ||
1006 | utility functions can easily be modified if you need special options. | ||
1007 | */ | ||
1008 | |||
1009 | ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen, | ||
1010 | const Bytef *source, uLong sourceLen)); | ||
1011 | /* | ||
1012 | Compresses the source buffer into the destination buffer. sourceLen is | ||
1013 | the byte length of the source buffer. Upon entry, destLen is the total | ||
1014 | size of the destination buffer, which must be at least the value returned | ||
1015 | by compressBound(sourceLen). Upon exit, destLen is the actual size of the | ||
1016 | compressed buffer. | ||
1017 | This function can be used to compress a whole file at once if the | ||
1018 | input file is mmap'ed. | ||
1019 | compress returns Z_OK if success, Z_MEM_ERROR if there was not | ||
1020 | enough memory, Z_BUF_ERROR if there was not enough room in the output | ||
1021 | buffer. | ||
1022 | */ | ||
1023 | |||
1024 | ZEXTERN int ZEXPORT compress2 OF((Bytef *dest, uLongf *destLen, | ||
1025 | const Bytef *source, uLong sourceLen, | ||
1026 | int level)); | ||
1027 | /* | ||
1028 | Compresses the source buffer into the destination buffer. The level | ||
1029 | parameter has the same meaning as in deflateInit. sourceLen is the byte | ||
1030 | length of the source buffer. Upon entry, destLen is the total size of the | ||
1031 | destination buffer, which must be at least the value returned by | ||
1032 | compressBound(sourceLen). Upon exit, destLen is the actual size of the | ||
1033 | compressed buffer. | ||
1034 | |||
1035 | compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough | ||
1036 | memory, Z_BUF_ERROR if there was not enough room in the output buffer, | ||
1037 | Z_STREAM_ERROR if the level parameter is invalid. | ||
1038 | */ | ||
1039 | |||
1040 | ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen)); | ||
1041 | /* | ||
1042 | compressBound() returns an upper bound on the compressed size after | ||
1043 | compress() or compress2() on sourceLen bytes. It would be used before | ||
1044 | a compress() or compress2() call to allocate the destination buffer. | ||
1045 | */ | ||
1046 | |||
1047 | ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen, | ||
1048 | const Bytef *source, uLong sourceLen)); | ||
1049 | /* | ||
1050 | Decompresses the source buffer into the destination buffer. sourceLen is | ||
1051 | the byte length of the source buffer. Upon entry, destLen is the total | ||
1052 | size of the destination buffer, which must be large enough to hold the | ||
1053 | entire uncompressed data. (The size of the uncompressed data must have | ||
1054 | been saved previously by the compressor and transmitted to the decompressor | ||
1055 | by some mechanism outside the scope of this compression library.) | ||
1056 | Upon exit, destLen is the actual size of the compressed buffer. | ||
1057 | This function can be used to decompress a whole file at once if the | ||
1058 | input file is mmap'ed. | ||
1059 | |||
1060 | uncompress returns Z_OK if success, Z_MEM_ERROR if there was not | ||
1061 | enough memory, Z_BUF_ERROR if there was not enough room in the output | ||
1062 | buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete. | ||
1063 | */ | ||
1064 | |||
1065 | |||
1066 | typedef voidp gzFile; | ||
1067 | |||
1068 | ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode)); | ||
1069 | /* | ||
1070 | Opens a gzip (.gz) file for reading or writing. The mode parameter | ||
1071 | is as in fopen ("rb" or "wb") but can also include a compression level | ||
1072 | ("wb9") or a strategy: 'f' for filtered data as in "wb6f", 'h' for | ||
1073 | Huffman only compression as in "wb1h", or 'R' for run-length encoding | ||
1074 | as in "wb1R". (See the description of deflateInit2 for more information | ||
1075 | about the strategy parameter.) | ||
1076 | |||
1077 | gzopen can be used to read a file which is not in gzip format; in this | ||
1078 | case gzread will directly read from the file without decompression. | ||
1079 | |||
1080 | gzopen returns NULL if the file could not be opened or if there was | ||
1081 | insufficient memory to allocate the (de)compression state; errno | ||
1082 | can be checked to distinguish the two cases (if errno is zero, the | ||
1083 | zlib error is Z_MEM_ERROR). */ | ||
1084 | |||
1085 | ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode)); | ||
1086 | /* | ||
1087 | gzdopen() associates a gzFile with the file descriptor fd. File | ||
1088 | descriptors are obtained from calls like open, dup, creat, pipe or | ||
1089 | fileno (in the file has been previously opened with fopen). | ||
1090 | The mode parameter is as in gzopen. | ||
1091 | The next call of gzclose on the returned gzFile will also close the | ||
1092 | file descriptor fd, just like fclose(fdopen(fd), mode) closes the file | ||
1093 | descriptor fd. If you want to keep fd open, use gzdopen(dup(fd), mode). | ||
1094 | gzdopen returns NULL if there was insufficient memory to allocate | ||
1095 | the (de)compression state. | ||
1096 | */ | ||
1097 | |||
1098 | ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy)); | ||
1099 | /* | ||
1100 | Dynamically update the compression level or strategy. See the description | ||
1101 | of deflateInit2 for the meaning of these parameters. | ||
1102 | gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not | ||
1103 | opened for writing. | ||
1104 | */ | ||
1105 | |||
1106 | ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len)); | ||
1107 | /* | ||
1108 | Reads the given number of uncompressed bytes from the compressed file. | ||
1109 | If the input file was not in gzip format, gzread copies the given number | ||
1110 | of bytes into the buffer. | ||
1111 | gzread returns the number of uncompressed bytes actually read (0 for | ||
1112 | end of file, -1 for error). */ | ||
1113 | |||
1114 | ZEXTERN int ZEXPORT gzwrite OF((gzFile file, | ||
1115 | voidpc buf, unsigned len)); | ||
1116 | /* | ||
1117 | Writes the given number of uncompressed bytes into the compressed file. | ||
1118 | gzwrite returns the number of uncompressed bytes actually written | ||
1119 | (0 in case of error). | ||
1120 | */ | ||
1121 | |||
1122 | ZEXTERN int ZEXPORTVA gzprintf OF((gzFile file, const char *format, ...)); | ||
1123 | /* | ||
1124 | Converts, formats, and writes the args to the compressed file under | ||
1125 | control of the format string, as in fprintf. gzprintf returns the number of | ||
1126 | uncompressed bytes actually written (0 in case of error). The number of | ||
1127 | uncompressed bytes written is limited to 4095. The caller should assure that | ||
1128 | this limit is not exceeded. If it is exceeded, then gzprintf() will return | ||
1129 | return an error (0) with nothing written. In this case, there may also be a | ||
1130 | buffer overflow with unpredictable consequences, which is possible only if | ||
1131 | zlib was compiled with the insecure functions sprintf() or vsprintf() | ||
1132 | because the secure snprintf() or vsnprintf() functions were not available. | ||
1133 | */ | ||
1134 | |||
1135 | ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s)); | ||
1136 | /* | ||
1137 | Writes the given null-terminated string to the compressed file, excluding | ||
1138 | the terminating null character. | ||
1139 | gzputs returns the number of characters written, or -1 in case of error. | ||
1140 | */ | ||
1141 | |||
1142 | ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len)); | ||
1143 | /* | ||
1144 | Reads bytes from the compressed file until len-1 characters are read, or | ||
1145 | a newline character is read and transferred to buf, or an end-of-file | ||
1146 | condition is encountered. The string is then terminated with a null | ||
1147 | character. | ||
1148 | gzgets returns buf, or Z_NULL in case of error. | ||
1149 | */ | ||
1150 | |||
1151 | ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c)); | ||
1152 | /* | ||
1153 | Writes c, converted to an unsigned char, into the compressed file. | ||
1154 | gzputc returns the value that was written, or -1 in case of error. | ||
1155 | */ | ||
1156 | |||
1157 | ZEXTERN int ZEXPORT gzgetc OF((gzFile file)); | ||
1158 | /* | ||
1159 | Reads one byte from the compressed file. gzgetc returns this byte | ||
1160 | or -1 in case of end of file or error. | ||
1161 | */ | ||
1162 | |||
1163 | ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file)); | ||
1164 | /* | ||
1165 | Push one character back onto the stream to be read again later. | ||
1166 | Only one character of push-back is allowed. gzungetc() returns the | ||
1167 | character pushed, or -1 on failure. gzungetc() will fail if a | ||
1168 | character has been pushed but not read yet, or if c is -1. The pushed | ||
1169 | character will be discarded if the stream is repositioned with gzseek() | ||
1170 | or gzrewind(). | ||
1171 | */ | ||
1172 | |||
1173 | ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush)); | ||
1174 | /* | ||
1175 | Flushes all pending output into the compressed file. The parameter | ||
1176 | flush is as in the deflate() function. The return value is the zlib | ||
1177 | error number (see function gzerror below). gzflush returns Z_OK if | ||
1178 | the flush parameter is Z_FINISH and all output could be flushed. | ||
1179 | gzflush should be called only when strictly necessary because it can | ||
1180 | degrade compression. | ||
1181 | */ | ||
1182 | |||
1183 | ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file, | ||
1184 | z_off_t offset, int whence)); | ||
1185 | /* | ||
1186 | Sets the starting position for the next gzread or gzwrite on the | ||
1187 | given compressed file. The offset represents a number of bytes in the | ||
1188 | uncompressed data stream. The whence parameter is defined as in lseek(2); | ||
1189 | the value SEEK_END is not supported. | ||
1190 | If the file is opened for reading, this function is emulated but can be | ||
1191 | extremely slow. If the file is opened for writing, only forward seeks are | ||
1192 | supported; gzseek then compresses a sequence of zeroes up to the new | ||
1193 | starting position. | ||
1194 | |||
1195 | gzseek returns the resulting offset location as measured in bytes from | ||
1196 | the beginning of the uncompressed stream, or -1 in case of error, in | ||
1197 | particular if the file is opened for writing and the new starting position | ||
1198 | would be before the current position. | ||
1199 | */ | ||
1200 | |||
1201 | ZEXTERN int ZEXPORT gzrewind OF((gzFile file)); | ||
1202 | /* | ||
1203 | Rewinds the given file. This function is supported only for reading. | ||
1204 | |||
1205 | gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET) | ||
1206 | */ | ||
1207 | |||
1208 | ZEXTERN z_off_t ZEXPORT gztell OF((gzFile file)); | ||
1209 | /* | ||
1210 | Returns the starting position for the next gzread or gzwrite on the | ||
1211 | given compressed file. This position represents a number of bytes in the | ||
1212 | uncompressed data stream. | ||
1213 | |||
1214 | gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR) | ||
1215 | */ | ||
1216 | |||
1217 | ZEXTERN int ZEXPORT gzeof OF((gzFile file)); | ||
1218 | /* | ||
1219 | Returns 1 when EOF has previously been detected reading the given | ||
1220 | input stream, otherwise zero. | ||
1221 | */ | ||
1222 | |||
1223 | ZEXTERN int ZEXPORT gzdirect OF((gzFile file)); | ||
1224 | /* | ||
1225 | Returns 1 if file is being read directly without decompression, otherwise | ||
1226 | zero. | ||
1227 | */ | ||
1228 | |||
1229 | ZEXTERN int ZEXPORT gzclose OF((gzFile file)); | ||
1230 | /* | ||
1231 | Flushes all pending output if necessary, closes the compressed file | ||
1232 | and deallocates all the (de)compression state. The return value is the zlib | ||
1233 | error number (see function gzerror below). | ||
1234 | */ | ||
1235 | |||
1236 | ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum)); | ||
1237 | /* | ||
1238 | Returns the error message for the last error which occurred on the | ||
1239 | given compressed file. errnum is set to zlib error number. If an | ||
1240 | error occurred in the file system and not in the compression library, | ||
1241 | errnum is set to Z_ERRNO and the application may consult errno | ||
1242 | to get the exact error code. | ||
1243 | */ | ||
1244 | |||
1245 | ZEXTERN void ZEXPORT gzclearerr OF((gzFile file)); | ||
1246 | /* | ||
1247 | Clears the error and end-of-file flags for file. This is analogous to the | ||
1248 | clearerr() function in stdio. This is useful for continuing to read a gzip | ||
1249 | file that is being written concurrently. | ||
1250 | */ | ||
1251 | |||
1252 | /* checksum functions */ | ||
1253 | |||
1254 | /* | ||
1255 | These functions are not related to compression but are exported | ||
1256 | anyway because they might be useful in applications using the | ||
1257 | compression library. | ||
1258 | */ | ||
1259 | |||
1260 | ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len)); | ||
1261 | /* | ||
1262 | Update a running Adler-32 checksum with the bytes buf[0..len-1] and | ||
1263 | return the updated checksum. If buf is NULL, this function returns | ||
1264 | the required initial value for the checksum. | ||
1265 | An Adler-32 checksum is almost as reliable as a CRC32 but can be computed | ||
1266 | much faster. Usage example: | ||
1267 | |||
1268 | uLong adler = adler32(0L, Z_NULL, 0); | ||
1269 | |||
1270 | while (read_buffer(buffer, length) != EOF) { | ||
1271 | adler = adler32(adler, buffer, length); | ||
1272 | } | ||
1273 | if (adler != original_adler) error(); | ||
1274 | */ | ||
1275 | |||
1276 | ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2, | ||
1277 | z_off_t len2)); | ||
1278 | /* | ||
1279 | Combine two Adler-32 checksums into one. For two sequences of bytes, seq1 | ||
1280 | and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for | ||
1281 | each, adler1 and adler2. adler32_combine() returns the Adler-32 checksum of | ||
1282 | seq1 and seq2 concatenated, requiring only adler1, adler2, and len2. | ||
1283 | */ | ||
1284 | |||
1285 | ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len)); | ||
1286 | /* | ||
1287 | Update a running CRC-32 with the bytes buf[0..len-1] and return the | ||
1288 | updated CRC-32. If buf is NULL, this function returns the required initial | ||
1289 | value for the for the crc. Pre- and post-conditioning (one's complement) is | ||
1290 | performed within this function so it shouldn't be done by the application. | ||
1291 | Usage example: | ||
1292 | |||
1293 | uLong crc = crc32(0L, Z_NULL, 0); | ||
1294 | |||
1295 | while (read_buffer(buffer, length) != EOF) { | ||
1296 | crc = crc32(crc, buffer, length); | ||
1297 | } | ||
1298 | if (crc != original_crc) error(); | ||
1299 | */ | ||
1300 | |||
1301 | ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2)); | ||
1302 | |||
1303 | /* | ||
1304 | Combine two CRC-32 check values into one. For two sequences of bytes, | ||
1305 | seq1 and seq2 with lengths len1 and len2, CRC-32 check values were | ||
1306 | calculated for each, crc1 and crc2. crc32_combine() returns the CRC-32 | ||
1307 | check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and | ||
1308 | len2. | ||
1309 | */ | ||
1310 | |||
1311 | |||
1312 | /* various hacks, don't look :) */ | ||
1313 | |||
1314 | /* deflateInit and inflateInit are macros to allow checking the zlib version | ||
1315 | * and the compiler's view of z_stream: | ||
1316 | */ | ||
1317 | ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level, | ||
1318 | const char *version, int stream_size)); | ||
1319 | ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm, | ||
1320 | const char *version, int stream_size)); | ||
1321 | ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int level, int method, | ||
1322 | int windowBits, int memLevel, | ||
1323 | int strategy, const char *version, | ||
1324 | int stream_size)); | ||
1325 | ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int windowBits, | ||
1326 | const char *version, int stream_size)); | ||
1327 | ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits, | ||
1328 | unsigned char FAR *window, | ||
1329 | const char *version, | ||
1330 | int stream_size)); | ||
1331 | #define deflateInit(strm, level) \ | ||
1332 | deflateInit_((strm), (level), ZLIB_VERSION, sizeof(z_stream)) | ||
1333 | #define inflateInit(strm) \ | ||
1334 | inflateInit_((strm), ZLIB_VERSION, sizeof(z_stream)) | ||
1335 | #define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ | ||
1336 | deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\ | ||
1337 | (strategy), ZLIB_VERSION, sizeof(z_stream)) | ||
1338 | #define inflateInit2(strm, windowBits) \ | ||
1339 | inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream)) | ||
1340 | #define inflateBackInit(strm, windowBits, window) \ | ||
1341 | inflateBackInit_((strm), (windowBits), (window), \ | ||
1342 | ZLIB_VERSION, sizeof(z_stream)) | ||
1343 | |||
1344 | |||
1345 | #if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL) | ||
1346 | struct internal_state {int dummy;}; /* hack for buggy compilers */ | ||
1347 | #endif | ||
1348 | |||
1349 | ZEXTERN const char * ZEXPORT zError OF((int)); | ||
1350 | ZEXTERN int ZEXPORT inflateSyncPoint OF((z_streamp z)); | ||
1351 | ZEXTERN const uLongf * ZEXPORT get_crc_table OF((void)); | ||
1352 | |||
1353 | #ifdef __cplusplus | ||
1354 | } | ||
1355 | #endif | ||
1356 | |||
1357 | #endif /* ZLIB_H */ | ||