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Commit | Line | Data |
---|---|---|
da8addba PS |
1 | C/7zip/Compress/LZMA/LZMADecoder.cpp | 11 |
2 | C/7zip/Compress/LZMA/LZMADecoder.h | 1 | |
3 | C/7zip/Compress/LZMA/LZMAEncoder.cpp | 10 | |
4 | C/Common/CommandLineParser.h | 2 | |
5 | C/Common/String.cpp | 2 | |
6 | C/Common/StringConvert.h | 2 | |
7 | ZLib.cpp | 4 | |
8 | lzmalib.h | 1362 +++++++++++++++++++++++++++++++++++ | |
9 | 8 files changed, 1386 insertions(+), 8 deletions(-) | |
10 | ||
11 | Index: lzma/C/7zip/Compress/LZMA/LZMADecoder.cpp | |
12 | =================================================================== | |
13 | --- lzma.orig/C/7zip/Compress/LZMA/LZMADecoder.cpp 2006-10-31 10:49:28.000000000 +1100 | |
14 | +++ lzma/C/7zip/Compress/LZMA/LZMADecoder.cpp 2006-10-31 10:49:28.000000000 +1100 | |
15 | @@ -274,12 +274,17 @@ STDMETHODIMP CDecoder::SetDecoderPropert | |
16 | Byte remainder = (Byte)(properties[0] / 9);\r | |
17 | int lp = remainder % 5;\r | |
18 | int pb = remainder / 5;\r | |
19 | - if (pb > NLength::kNumPosStatesBitsMax)\r | |
20 | - return E_INVALIDARG;\r | |
21 | - _posStateMask = (1 << pb) - 1;\r | |
22 | UInt32 dictionarySize = 0;\r | |
23 | for (int i = 0; i < 4; i++)\r | |
24 | dictionarySize += ((UInt32)(properties[1 + i])) << (i * 8);\r | |
25 | + return SetDecoderPropertiesRaw(lc, lp, pb, dictionarySize);\r | |
26 | +}\r | |
27 | +\r | |
28 | +STDMETHODIMP CDecoder::SetDecoderPropertiesRaw(int lc, int lp, int pb, UInt32 dictionarySize)\r | |
29 | +{\r | |
30 | + if (pb > NLength::kNumPosStatesBitsMax)\r | |
31 | + return E_INVALIDARG;\r | |
32 | + _posStateMask = (1 << pb) - 1;\r | |
33 | if (!_outWindowStream.Create(dictionarySize))\r | |
34 | return E_OUTOFMEMORY;\r | |
35 | if (!_literalDecoder.Create(lp, lc))\r | |
36 | Index: lzma/C/7zip/Compress/LZMA/LZMADecoder.h | |
37 | =================================================================== | |
38 | --- lzma.orig/C/7zip/Compress/LZMA/LZMADecoder.h 2006-10-31 10:49:28.000000000 +1100 | |
39 | +++ lzma/C/7zip/Compress/LZMA/LZMADecoder.h 2006-10-31 21:05:37.000000000 +1100 | |
40 | @@ -242,6 +242,7 @@ public:\r | |
41 | STDMETHOD(Read)(void *data, UInt32 size, UInt32 *processedSize);\r | |
42 | #endif\r | |
43 | \r | |
44 | + STDMETHOD(SetDecoderPropertiesRaw)(int lc, int lp, int pb, UInt32 dictionarySize);\r | |
45 | CDecoder(): _outSizeDefined(false) {}\r | |
46 | virtual ~CDecoder() {}\r | |
47 | };\r | |
48 | Index: lzma/C/7zip/Compress/LZMA/LZMAEncoder.cpp | |
49 | =================================================================== | |
50 | --- lzma.orig/C/7zip/Compress/LZMA/LZMAEncoder.cpp 2006-10-31 10:49:28.000000000 +1100 | |
51 | +++ lzma/C/7zip/Compress/LZMA/LZMAEncoder.cpp 2006-10-31 21:21:22.000000000 +1100 | |
52 | @@ -484,12 +484,22 @@ STDMETHODIMP CEncoder::SetCoderPropertie | |
53 | \r | |
54 | STDMETHODIMP CEncoder::WriteCoderProperties(ISequentialOutStream *outStream)\r | |
55 | { \r | |
56 | + Byte firstByte = (_posStateBits * 5 + _numLiteralPosStateBits) * 9 + _numLiteralContextBits;\r | |
57 | + RINOK(outStream->Write(&firstByte, sizeof(firstByte), NULL));\r | |
58 | + for (int i = 0; i < 4; i++)\r | |
59 | + {\r | |
60 | + Byte b = Byte(_dictionarySize >> (8 * i));\r | |
61 | + RINOK(outStream->Write(&b, sizeof(b), NULL));\r | |
62 | + }\r | |
63 | + return S_OK;\r | |
64 | +#if 0\r | |
65 | const UInt32 kPropSize = 5;\r | |
66 | Byte properties[kPropSize];\r | |
67 | properties[0] = (_posStateBits * 5 + _numLiteralPosStateBits) * 9 + _numLiteralContextBits;\r | |
68 | for (int i = 0; i < 4; i++)\r | |
69 | properties[1 + i] = Byte(_dictionarySize >> (8 * i));\r | |
70 | return WriteStream(outStream, properties, kPropSize, NULL);\r | |
71 | +#endif\r | |
72 | }\r | |
73 | \r | |
74 | STDMETHODIMP CEncoder::SetOutStream(ISequentialOutStream *outStream)\r | |
75 | Index: lzma/lzmalib.h | |
76 | =================================================================== | |
77 | --- /dev/null 1970-01-01 00:00:00.000000000 +0000 | |
4ac3cfc7 | 78 | +++ ./C/7zip/Compress/LZMA_Lib/lzmalib.h 2006-10-31 13:56:37.000000000 +1100 |
da8addba PS |
79 | @@ -0,0 +1,1362 @@ |
80 | +/* lzmalib.h - altered version of zlib.h | |
81 | + zlib.h -- interface of the 'zlib' general purpose compression library | |
82 | + version 1.2.3, July 18th, 2005 | |
83 | + | |
84 | + Copyright (C) 1995-2005 Jean-loup Gailly and Mark Adler | |
85 | + | |
86 | + This software is provided 'as-is', without any express or implied | |
87 | + warranty. In no event will the authors be held liable for any damages | |
88 | + arising from the use of this software. | |
89 | + | |
90 | + Permission is granted to anyone to use this software for any purpose, | |
91 | + including commercial applications, and to alter it and redistribute it | |
92 | + freely, subject to the following restrictions: | |
93 | + | |
94 | + 1. The origin of this software must not be misrepresented; you must not | |
95 | + claim that you wrote the original software. If you use this software | |
96 | + in a product, an acknowledgment in the product documentation would be | |
97 | + appreciated but is not required. | |
98 | + 2. Altered source versions must be plainly marked as such, and must not be | |
99 | + misrepresented as being the original software. | |
100 | + 3. This notice may not be removed or altered from any source distribution. | |
101 | + | |
102 | + Jean-loup Gailly Mark Adler | |
103 | + jloup@gzip.org madler@alumni.caltech.edu | |
104 | + | |
105 | + | |
106 | + The data format used by the zlib library is described by RFCs (Request for | |
107 | + Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt | |
108 | + (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format). | |
109 | +*/ | |
110 | + | |
111 | +#ifndef ZLIB_H | |
112 | +#define ZLIB_H | |
113 | + | |
114 | +#include "zconf.h" | |
115 | + | |
116 | +#ifdef __cplusplus | |
117 | +extern "C" { | |
118 | +#endif | |
119 | + | |
120 | +#define ZLIB_VERSION "1.2.3" | |
121 | +#define ZLIB_VERNUM 0x1230 | |
122 | + | |
123 | +/* | |
124 | + The 'zlib' compression library provides in-memory compression and | |
125 | + decompression functions, including integrity checks of the uncompressed | |
126 | + data. This version of the library supports only one compression method | |
127 | + (deflation) but other algorithms will be added later and will have the same | |
128 | + stream interface. | |
129 | + | |
130 | + Compression can be done in a single step if the buffers are large | |
131 | + enough (for example if an input file is mmap'ed), or can be done by | |
132 | + repeated calls of the compression function. In the latter case, the | |
133 | + application must provide more input and/or consume the output | |
134 | + (providing more output space) before each call. | |
135 | + | |
136 | + The compressed data format used by default by the in-memory functions is | |
137 | + the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped | |
138 | + around a deflate stream, which is itself documented in RFC 1951. | |
139 | + | |
140 | + The library also supports reading and writing files in gzip (.gz) format | |
141 | + with an interface similar to that of stdio using the functions that start | |
142 | + with "gz". The gzip format is different from the zlib format. gzip is a | |
143 | + gzip wrapper, documented in RFC 1952, wrapped around a deflate stream. | |
144 | + | |
145 | + This library can optionally read and write gzip streams in memory as well. | |
146 | + | |
147 | + The zlib format was designed to be compact and fast for use in memory | |
148 | + and on communications channels. The gzip format was designed for single- | |
149 | + file compression on file systems, has a larger header than zlib to maintain | |
150 | + directory information, and uses a different, slower check method than zlib. | |
151 | + | |
152 | + The library does not install any signal handler. The decoder checks | |
153 | + the consistency of the compressed data, so the library should never | |
154 | + crash even in case of corrupted input. | |
155 | +*/ | |
156 | + | |
157 | +typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size)); | |
158 | +typedef void (*free_func) OF((voidpf opaque, voidpf address)); | |
159 | + | |
160 | +struct internal_state; | |
161 | + | |
162 | +typedef struct z_stream_s { | |
163 | + Bytef *next_in; /* next input byte */ | |
164 | + uInt avail_in; /* number of bytes available at next_in */ | |
165 | + uLong total_in; /* total nb of input bytes read so far */ | |
166 | + | |
167 | + Bytef *next_out; /* next output byte should be put there */ | |
168 | + uInt avail_out; /* remaining free space at next_out */ | |
169 | + uLong total_out; /* total nb of bytes output so far */ | |
170 | + | |
171 | + char *msg; /* last error message, NULL if no error */ | |
172 | + struct internal_state FAR *state; /* not visible by applications */ | |
173 | + | |
174 | + alloc_func zalloc; /* used to allocate the internal state */ | |
175 | + free_func zfree; /* used to free the internal state */ | |
176 | + voidpf opaque; /* private data object passed to zalloc and zfree */ | |
177 | + | |
178 | + int data_type; /* best guess about the data type: binary or text */ | |
179 | + uLong adler; /* adler32 value of the uncompressed data */ | |
180 | + uLong reserved; /* reserved for future use */ | |
181 | +} z_stream; | |
182 | + | |
183 | +typedef z_stream FAR *z_streamp; | |
184 | + | |
185 | +/* | |
186 | + gzip header information passed to and from zlib routines. See RFC 1952 | |
187 | + for more details on the meanings of these fields. | |
188 | +*/ | |
189 | +typedef struct gz_header_s { | |
190 | + int text; /* true if compressed data believed to be text */ | |
191 | + uLong time; /* modification time */ | |
192 | + int xflags; /* extra flags (not used when writing a gzip file) */ | |
193 | + int os; /* operating system */ | |
194 | + Bytef *extra; /* pointer to extra field or Z_NULL if none */ | |
195 | + uInt extra_len; /* extra field length (valid if extra != Z_NULL) */ | |
196 | + uInt extra_max; /* space at extra (only when reading header) */ | |
197 | + Bytef *name; /* pointer to zero-terminated file name or Z_NULL */ | |
198 | + uInt name_max; /* space at name (only when reading header) */ | |
199 | + Bytef *comment; /* pointer to zero-terminated comment or Z_NULL */ | |
200 | + uInt comm_max; /* space at comment (only when reading header) */ | |
201 | + int hcrc; /* true if there was or will be a header crc */ | |
202 | + int done; /* true when done reading gzip header (not used | |
203 | + when writing a gzip file) */ | |
204 | +} gz_header; | |
205 | + | |
206 | +typedef gz_header FAR *gz_headerp; | |
207 | + | |
208 | +/* | |
209 | + The application must update next_in and avail_in when avail_in has | |
210 | + dropped to zero. It must update next_out and avail_out when avail_out | |
211 | + has dropped to zero. The application must initialize zalloc, zfree and | |
212 | + opaque before calling the init function. All other fields are set by the | |
213 | + compression library and must not be updated by the application. | |
214 | + | |
215 | + The opaque value provided by the application will be passed as the first | |
216 | + parameter for calls of zalloc and zfree. This can be useful for custom | |
217 | + memory management. The compression library attaches no meaning to the | |
218 | + opaque value. | |
219 | + | |
220 | + zalloc must return Z_NULL if there is not enough memory for the object. | |
221 | + If zlib is used in a multi-threaded application, zalloc and zfree must be | |
222 | + thread safe. | |
223 | + | |
224 | + On 16-bit systems, the functions zalloc and zfree must be able to allocate | |
225 | + exactly 65536 bytes, but will not be required to allocate more than this | |
226 | + if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS, | |
227 | + pointers returned by zalloc for objects of exactly 65536 bytes *must* | |
228 | + have their offset normalized to zero. The default allocation function | |
229 | + provided by this library ensures this (see zutil.c). To reduce memory | |
230 | + requirements and avoid any allocation of 64K objects, at the expense of | |
231 | + compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h). | |
232 | + | |
233 | + The fields total_in and total_out can be used for statistics or | |
234 | + progress reports. After compression, total_in holds the total size of | |
235 | + the uncompressed data and may be saved for use in the decompressor | |
236 | + (particularly if the decompressor wants to decompress everything in | |
237 | + a single step). | |
238 | +*/ | |
239 | + | |
240 | + /* constants */ | |
241 | + | |
242 | +#define Z_NO_FLUSH 0 | |
243 | +#define Z_PARTIAL_FLUSH 1 /* will be removed, use Z_SYNC_FLUSH instead */ | |
244 | +#define Z_SYNC_FLUSH 2 | |
245 | +#define Z_FULL_FLUSH 3 | |
246 | +#define Z_FINISH 4 | |
247 | +#define Z_BLOCK 5 | |
248 | +/* Allowed flush values; see deflate() and inflate() below for details */ | |
249 | + | |
250 | +#define Z_OK 0 | |
251 | +#define Z_STREAM_END 1 | |
252 | +#define Z_NEED_DICT 2 | |
253 | +#define Z_ERRNO (-1) | |
254 | +#define Z_STREAM_ERROR (-2) | |
255 | +#define Z_DATA_ERROR (-3) | |
256 | +#define Z_MEM_ERROR (-4) | |
257 | +#define Z_BUF_ERROR (-5) | |
258 | +#define Z_VERSION_ERROR (-6) | |
259 | +/* Return codes for the compression/decompression functions. Negative | |
260 | + * values are errors, positive values are used for special but normal events. | |
261 | + */ | |
262 | + | |
263 | +#define Z_NO_COMPRESSION 0 | |
264 | +#define Z_BEST_SPEED 1 | |
265 | +#define Z_BEST_COMPRESSION 9 | |
266 | +#define Z_DEFAULT_COMPRESSION (-1) | |
267 | +/* compression levels */ | |
268 | + | |
269 | +#define Z_FILTERED 1 | |
270 | +#define Z_HUFFMAN_ONLY 2 | |
271 | +#define Z_RLE 3 | |
272 | +#define Z_FIXED 4 | |
273 | +#define Z_DEFAULT_STRATEGY 0 | |
274 | +/* compression strategy; see deflateInit2() below for details */ | |
275 | + | |
276 | +#define Z_BINARY 0 | |
277 | +#define Z_TEXT 1 | |
278 | +#define Z_ASCII Z_TEXT /* for compatibility with 1.2.2 and earlier */ | |
279 | +#define Z_UNKNOWN 2 | |
280 | +/* Possible values of the data_type field (though see inflate()) */ | |
281 | + | |
282 | +#define Z_DEFLATED 8 | |
283 | +/* The deflate compression method (the only one supported in this version) */ | |
284 | + | |
285 | +#define Z_NULL 0 /* for initializing zalloc, zfree, opaque */ | |
286 | + | |
287 | +#define zlib_version zlibVersion() | |
288 | +/* for compatibility with versions < 1.0.2 */ | |
289 | + | |
290 | + /* basic functions */ | |
291 | + | |
292 | +ZEXTERN const char * ZEXPORT zlibVersion OF((void)); | |
293 | +/* The application can compare zlibVersion and ZLIB_VERSION for consistency. | |
294 | + If the first character differs, the library code actually used is | |
295 | + not compatible with the zlib.h header file used by the application. | |
296 | + This check is automatically made by deflateInit and inflateInit. | |
297 | + */ | |
298 | + | |
299 | +/* | |
300 | +ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level)); | |
301 | + | |
302 | + Initializes the internal stream state for compression. The fields | |
303 | + zalloc, zfree and opaque must be initialized before by the caller. | |
304 | + If zalloc and zfree are set to Z_NULL, deflateInit updates them to | |
305 | + use default allocation functions. | |
306 | + | |
307 | + The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9: | |
308 | + 1 gives best speed, 9 gives best compression, 0 gives no compression at | |
309 | + all (the input data is simply copied a block at a time). | |
310 | + Z_DEFAULT_COMPRESSION requests a default compromise between speed and | |
311 | + compression (currently equivalent to level 6). | |
312 | + | |
313 | + deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not | |
314 | + enough memory, Z_STREAM_ERROR if level is not a valid compression level, | |
315 | + Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible | |
316 | + with the version assumed by the caller (ZLIB_VERSION). | |
317 | + msg is set to null if there is no error message. deflateInit does not | |
318 | + perform any compression: this will be done by deflate(). | |
319 | +*/ | |
320 | + | |
321 | + | |
322 | +ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush)); | |
323 | +/* | |
324 | + deflate compresses as much data as possible, and stops when the input | |
325 | + buffer becomes empty or the output buffer becomes full. It may introduce some | |
326 | + output latency (reading input without producing any output) except when | |
327 | + forced to flush. | |
328 | + | |
329 | + The detailed semantics are as follows. deflate performs one or both of the | |
330 | + following actions: | |
331 | + | |
332 | + - Compress more input starting at next_in and update next_in and avail_in | |
333 | + accordingly. If not all input can be processed (because there is not | |
334 | + enough room in the output buffer), next_in and avail_in are updated and | |
335 | + processing will resume at this point for the next call of deflate(). | |
336 | + | |
337 | + - Provide more output starting at next_out and update next_out and avail_out | |
338 | + accordingly. This action is forced if the parameter flush is non zero. | |
339 | + Forcing flush frequently degrades the compression ratio, so this parameter | |
340 | + should be set only when necessary (in interactive applications). | |
341 | + Some output may be provided even if flush is not set. | |
342 | + | |
343 | + Before the call of deflate(), the application should ensure that at least | |
344 | + one of the actions is possible, by providing more input and/or consuming | |
345 | + more output, and updating avail_in or avail_out accordingly; avail_out | |
346 | + should never be zero before the call. The application can consume the | |
347 | + compressed output when it wants, for example when the output buffer is full | |
348 | + (avail_out == 0), or after each call of deflate(). If deflate returns Z_OK | |
349 | + and with zero avail_out, it must be called again after making room in the | |
350 | + output buffer because there might be more output pending. | |
351 | + | |
352 | + Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to | |
353 | + decide how much data to accumualte before producing output, in order to | |
354 | + maximize compression. | |
355 | + | |
356 | + If the parameter flush is set to Z_SYNC_FLUSH, all pending output is | |
357 | + flushed to the output buffer and the output is aligned on a byte boundary, so | |
358 | + that the decompressor can get all input data available so far. (In particular | |
359 | + avail_in is zero after the call if enough output space has been provided | |
360 | + before the call.) Flushing may degrade compression for some compression | |
361 | + algorithms and so it should be used only when necessary. | |
362 | + | |
363 | + If flush is set to Z_FULL_FLUSH, all output is flushed as with | |
364 | + Z_SYNC_FLUSH, and the compression state is reset so that decompression can | |
365 | + restart from this point if previous compressed data has been damaged or if | |
366 | + random access is desired. Using Z_FULL_FLUSH too often can seriously degrade | |
367 | + compression. | |
368 | + | |
369 | + If deflate returns with avail_out == 0, this function must be called again | |
370 | + with the same value of the flush parameter and more output space (updated | |
371 | + avail_out), until the flush is complete (deflate returns with non-zero | |
372 | + avail_out). In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that | |
373 | + avail_out is greater than six to avoid repeated flush markers due to | |
374 | + avail_out == 0 on return. | |
375 | + | |
376 | + If the parameter flush is set to Z_FINISH, pending input is processed, | |
377 | + pending output is flushed and deflate returns with Z_STREAM_END if there | |
378 | + was enough output space; if deflate returns with Z_OK, this function must be | |
379 | + called again with Z_FINISH and more output space (updated avail_out) but no | |
380 | + more input data, until it returns with Z_STREAM_END or an error. After | |
381 | + deflate has returned Z_STREAM_END, the only possible operations on the | |
382 | + stream are deflateReset or deflateEnd. | |
383 | + | |
384 | + Z_FINISH can be used immediately after deflateInit if all the compression | |
385 | + is to be done in a single step. In this case, avail_out must be at least | |
386 | + the value returned by deflateBound (see below). If deflate does not return | |
387 | + Z_STREAM_END, then it must be called again as described above. | |
388 | + | |
389 | + deflate() sets strm->adler to the adler32 checksum of all input read | |
390 | + so far (that is, total_in bytes). | |
391 | + | |
392 | + deflate() may update strm->data_type if it can make a good guess about | |
393 | + the input data type (Z_BINARY or Z_TEXT). In doubt, the data is considered | |
394 | + binary. This field is only for information purposes and does not affect | |
395 | + the compression algorithm in any manner. | |
396 | + | |
397 | + deflate() returns Z_OK if some progress has been made (more input | |
398 | + processed or more output produced), Z_STREAM_END if all input has been | |
399 | + consumed and all output has been produced (only when flush is set to | |
400 | + Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example | |
401 | + if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible | |
402 | + (for example avail_in or avail_out was zero). Note that Z_BUF_ERROR is not | |
403 | + fatal, and deflate() can be called again with more input and more output | |
404 | + space to continue compressing. | |
405 | +*/ | |
406 | + | |
407 | + | |
408 | +ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm)); | |
409 | +/* | |
410 | + All dynamically allocated data structures for this stream are freed. | |
411 | + This function discards any unprocessed input and does not flush any | |
412 | + pending output. | |
413 | + | |
414 | + deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the | |
415 | + stream state was inconsistent, Z_DATA_ERROR if the stream was freed | |
416 | + prematurely (some input or output was discarded). In the error case, | |
417 | + msg may be set but then points to a static string (which must not be | |
418 | + deallocated). | |
419 | +*/ | |
420 | + | |
421 | + | |
422 | +/* | |
423 | +ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm)); | |
424 | + | |
425 | + Initializes the internal stream state for decompression. The fields | |
426 | + next_in, avail_in, zalloc, zfree and opaque must be initialized before by | |
427 | + the caller. If next_in is not Z_NULL and avail_in is large enough (the exact | |
428 | + value depends on the compression method), inflateInit determines the | |
429 | + compression method from the zlib header and allocates all data structures | |
430 | + accordingly; otherwise the allocation will be deferred to the first call of | |
431 | + inflate. If zalloc and zfree are set to Z_NULL, inflateInit updates them to | |
432 | + use default allocation functions. | |
433 | + | |
434 | + inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough | |
435 | + memory, Z_VERSION_ERROR if the zlib library version is incompatible with the | |
436 | + version assumed by the caller. msg is set to null if there is no error | |
437 | + message. inflateInit does not perform any decompression apart from reading | |
438 | + the zlib header if present: this will be done by inflate(). (So next_in and | |
439 | + avail_in may be modified, but next_out and avail_out are unchanged.) | |
440 | +*/ | |
441 | + | |
442 | + | |
443 | +ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush)); | |
444 | +/* | |
445 | + inflate decompresses as much data as possible, and stops when the input | |
446 | + buffer becomes empty or the output buffer becomes full. It may introduce | |
447 | + some output latency (reading input without producing any output) except when | |
448 | + forced to flush. | |
449 | + | |
450 | + The detailed semantics are as follows. inflate performs one or both of the | |
451 | + following actions: | |
452 | + | |
453 | + - Decompress more input starting at next_in and update next_in and avail_in | |
454 | + accordingly. If not all input can be processed (because there is not | |
455 | + enough room in the output buffer), next_in is updated and processing | |
456 | + will resume at this point for the next call of inflate(). | |
457 | + | |
458 | + - Provide more output starting at next_out and update next_out and avail_out | |
459 | + accordingly. inflate() provides as much output as possible, until there | |
460 | + is no more input data or no more space in the output buffer (see below | |
461 | + about the flush parameter). | |
462 | + | |
463 | + Before the call of inflate(), the application should ensure that at least | |
464 | + one of the actions is possible, by providing more input and/or consuming | |
465 | + more output, and updating the next_* and avail_* values accordingly. | |
466 | + The application can consume the uncompressed output when it wants, for | |
467 | + example when the output buffer is full (avail_out == 0), or after each | |
468 | + call of inflate(). If inflate returns Z_OK and with zero avail_out, it | |
469 | + must be called again after making room in the output buffer because there | |
470 | + might be more output pending. | |
471 | + | |
472 | + The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH, | |
473 | + Z_FINISH, or Z_BLOCK. Z_SYNC_FLUSH requests that inflate() flush as much | |
474 | + output as possible to the output buffer. Z_BLOCK requests that inflate() stop | |
475 | + if and when it gets to the next deflate block boundary. When decoding the | |
476 | + zlib or gzip format, this will cause inflate() to return immediately after | |
477 | + the header and before the first block. When doing a raw inflate, inflate() | |
478 | + will go ahead and process the first block, and will return when it gets to | |
479 | + the end of that block, or when it runs out of data. | |
480 | + | |
481 | + The Z_BLOCK option assists in appending to or combining deflate streams. | |
482 | + Also to assist in this, on return inflate() will set strm->data_type to the | |
483 | + number of unused bits in the last byte taken from strm->next_in, plus 64 | |
484 | + if inflate() is currently decoding the last block in the deflate stream, | |
485 | + plus 128 if inflate() returned immediately after decoding an end-of-block | |
486 | + code or decoding the complete header up to just before the first byte of the | |
487 | + deflate stream. The end-of-block will not be indicated until all of the | |
488 | + uncompressed data from that block has been written to strm->next_out. The | |
489 | + number of unused bits may in general be greater than seven, except when | |
490 | + bit 7 of data_type is set, in which case the number of unused bits will be | |
491 | + less than eight. | |
492 | + | |
493 | + inflate() should normally be called until it returns Z_STREAM_END or an | |
494 | + error. However if all decompression is to be performed in a single step | |
495 | + (a single call of inflate), the parameter flush should be set to | |
496 | + Z_FINISH. In this case all pending input is processed and all pending | |
497 | + output is flushed; avail_out must be large enough to hold all the | |
498 | + uncompressed data. (The size of the uncompressed data may have been saved | |
499 | + by the compressor for this purpose.) The next operation on this stream must | |
500 | + be inflateEnd to deallocate the decompression state. The use of Z_FINISH | |
501 | + is never required, but can be used to inform inflate that a faster approach | |
502 | + may be used for the single inflate() call. | |
503 | + | |
504 | + In this implementation, inflate() always flushes as much output as | |
505 | + possible to the output buffer, and always uses the faster approach on the | |
506 | + first call. So the only effect of the flush parameter in this implementation | |
507 | + is on the return value of inflate(), as noted below, or when it returns early | |
508 | + because Z_BLOCK is used. | |
509 | + | |
510 | + If a preset dictionary is needed after this call (see inflateSetDictionary | |
511 | + below), inflate sets strm->adler to the adler32 checksum of the dictionary | |
512 | + chosen by the compressor and returns Z_NEED_DICT; otherwise it sets | |
513 | + strm->adler to the adler32 checksum of all output produced so far (that is, | |
514 | + total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described | |
515 | + below. At the end of the stream, inflate() checks that its computed adler32 | |
516 | + checksum is equal to that saved by the compressor and returns Z_STREAM_END | |
517 | + only if the checksum is correct. | |
518 | + | |
519 | + inflate() will decompress and check either zlib-wrapped or gzip-wrapped | |
520 | + deflate data. The header type is detected automatically. Any information | |
521 | + contained in the gzip header is not retained, so applications that need that | |
522 | + information should instead use raw inflate, see inflateInit2() below, or | |
523 | + inflateBack() and perform their own processing of the gzip header and | |
524 | + trailer. | |
525 | + | |
526 | + inflate() returns Z_OK if some progress has been made (more input processed | |
527 | + or more output produced), Z_STREAM_END if the end of the compressed data has | |
528 | + been reached and all uncompressed output has been produced, Z_NEED_DICT if a | |
529 | + preset dictionary is needed at this point, Z_DATA_ERROR if the input data was | |
530 | + corrupted (input stream not conforming to the zlib format or incorrect check | |
531 | + value), Z_STREAM_ERROR if the stream structure was inconsistent (for example | |
532 | + if next_in or next_out was NULL), Z_MEM_ERROR if there was not enough memory, | |
533 | + Z_BUF_ERROR if no progress is possible or if there was not enough room in the | |
534 | + output buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and | |
535 | + inflate() can be called again with more input and more output space to | |
536 | + continue decompressing. If Z_DATA_ERROR is returned, the application may then | |
537 | + call inflateSync() to look for a good compression block if a partial recovery | |
538 | + of the data is desired. | |
539 | +*/ | |
540 | + | |
541 | + | |
542 | +ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm)); | |
543 | +/* | |
544 | + All dynamically allocated data structures for this stream are freed. | |
545 | + This function discards any unprocessed input and does not flush any | |
546 | + pending output. | |
547 | + | |
548 | + inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state | |
549 | + was inconsistent. In the error case, msg may be set but then points to a | |
550 | + static string (which must not be deallocated). | |
551 | +*/ | |
552 | + | |
553 | + /* Advanced functions */ | |
554 | + | |
555 | +/* | |
556 | + The following functions are needed only in some special applications. | |
557 | +*/ | |
558 | + | |
559 | +/* | |
560 | +ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm, | |
561 | + int level, | |
562 | + int method, | |
563 | + int windowBits, | |
564 | + int memLevel, | |
565 | + int strategy)); | |
566 | + | |
567 | + This is another version of deflateInit with more compression options. The | |
568 | + fields next_in, zalloc, zfree and opaque must be initialized before by | |
569 | + the caller. | |
570 | + | |
571 | + The method parameter is the compression method. It must be Z_DEFLATED in | |
572 | + this version of the library. | |
573 | + | |
574 | + The windowBits parameter is the base two logarithm of the window size | |
575 | + (the size of the history buffer). It should be in the range 8..15 for this | |
576 | + version of the library. Larger values of this parameter result in better | |
577 | + compression at the expense of memory usage. The default value is 15 if | |
578 | + deflateInit is used instead. | |
579 | + | |
580 | + windowBits can also be -8..-15 for raw deflate. In this case, -windowBits | |
581 | + determines the window size. deflate() will then generate raw deflate data | |
582 | + with no zlib header or trailer, and will not compute an adler32 check value. | |
583 | + | |
584 | + windowBits can also be greater than 15 for optional gzip encoding. Add | |
585 | + 16 to windowBits to write a simple gzip header and trailer around the | |
586 | + compressed data instead of a zlib wrapper. The gzip header will have no | |
587 | + file name, no extra data, no comment, no modification time (set to zero), | |
588 | + no header crc, and the operating system will be set to 255 (unknown). If a | |
589 | + gzip stream is being written, strm->adler is a crc32 instead of an adler32. | |
590 | + | |
591 | + The memLevel parameter specifies how much memory should be allocated | |
592 | + for the internal compression state. memLevel=1 uses minimum memory but | |
593 | + is slow and reduces compression ratio; memLevel=9 uses maximum memory | |
594 | + for optimal speed. The default value is 8. See zconf.h for total memory | |
595 | + usage as a function of windowBits and memLevel. | |
596 | + | |
597 | + The strategy parameter is used to tune the compression algorithm. Use the | |
598 | + value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a | |
599 | + filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no | |
600 | + string match), or Z_RLE to limit match distances to one (run-length | |
601 | + encoding). Filtered data consists mostly of small values with a somewhat | |
602 | + random distribution. In this case, the compression algorithm is tuned to | |
603 | + compress them better. The effect of Z_FILTERED is to force more Huffman | |
604 | + coding and less string matching; it is somewhat intermediate between | |
605 | + Z_DEFAULT and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as fast as | |
606 | + Z_HUFFMAN_ONLY, but give better compression for PNG image data. The strategy | |
607 | + parameter only affects the compression ratio but not the correctness of the | |
608 | + compressed output even if it is not set appropriately. Z_FIXED prevents the | |
609 | + use of dynamic Huffman codes, allowing for a simpler decoder for special | |
610 | + applications. | |
611 | + | |
612 | + deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough | |
613 | + memory, Z_STREAM_ERROR if a parameter is invalid (such as an invalid | |
614 | + method). msg is set to null if there is no error message. deflateInit2 does | |
615 | + not perform any compression: this will be done by deflate(). | |
616 | +*/ | |
617 | + | |
618 | +ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm, | |
619 | + const Bytef *dictionary, | |
620 | + uInt dictLength)); | |
621 | +/* | |
622 | + Initializes the compression dictionary from the given byte sequence | |
623 | + without producing any compressed output. This function must be called | |
624 | + immediately after deflateInit, deflateInit2 or deflateReset, before any | |
625 | + call of deflate. The compressor and decompressor must use exactly the same | |
626 | + dictionary (see inflateSetDictionary). | |
627 | + | |
628 | + The dictionary should consist of strings (byte sequences) that are likely | |
629 | + to be encountered later in the data to be compressed, with the most commonly | |
630 | + used strings preferably put towards the end of the dictionary. Using a | |
631 | + dictionary is most useful when the data to be compressed is short and can be | |
632 | + predicted with good accuracy; the data can then be compressed better than | |
633 | + with the default empty dictionary. | |
634 | + | |
635 | + Depending on the size of the compression data structures selected by | |
636 | + deflateInit or deflateInit2, a part of the dictionary may in effect be | |
637 | + discarded, for example if the dictionary is larger than the window size in | |
638 | + deflate or deflate2. Thus the strings most likely to be useful should be | |
639 | + put at the end of the dictionary, not at the front. In addition, the | |
640 | + current implementation of deflate will use at most the window size minus | |
641 | + 262 bytes of the provided dictionary. | |
642 | + | |
643 | + Upon return of this function, strm->adler is set to the adler32 value | |
644 | + of the dictionary; the decompressor may later use this value to determine | |
645 | + which dictionary has been used by the compressor. (The adler32 value | |
646 | + applies to the whole dictionary even if only a subset of the dictionary is | |
647 | + actually used by the compressor.) If a raw deflate was requested, then the | |
648 | + adler32 value is not computed and strm->adler is not set. | |
649 | + | |
650 | + deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a | |
651 | + parameter is invalid (such as NULL dictionary) or the stream state is | |
652 | + inconsistent (for example if deflate has already been called for this stream | |
653 | + or if the compression method is bsort). deflateSetDictionary does not | |
654 | + perform any compression: this will be done by deflate(). | |
655 | +*/ | |
656 | + | |
657 | +ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest, | |
658 | + z_streamp source)); | |
659 | +/* | |
660 | + Sets the destination stream as a complete copy of the source stream. | |
661 | + | |
662 | + This function can be useful when several compression strategies will be | |
663 | + tried, for example when there are several ways of pre-processing the input | |
664 | + data with a filter. The streams that will be discarded should then be freed | |
665 | + by calling deflateEnd. Note that deflateCopy duplicates the internal | |
666 | + compression state which can be quite large, so this strategy is slow and | |
667 | + can consume lots of memory. | |
668 | + | |
669 | + deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not | |
670 | + enough memory, Z_STREAM_ERROR if the source stream state was inconsistent | |
671 | + (such as zalloc being NULL). msg is left unchanged in both source and | |
672 | + destination. | |
673 | +*/ | |
674 | + | |
675 | +ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm)); | |
676 | +/* | |
677 | + This function is equivalent to deflateEnd followed by deflateInit, | |
678 | + but does not free and reallocate all the internal compression state. | |
679 | + The stream will keep the same compression level and any other attributes | |
680 | + that may have been set by deflateInit2. | |
681 | + | |
682 | + deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source | |
683 | + stream state was inconsistent (such as zalloc or state being NULL). | |
684 | +*/ | |
685 | + | |
686 | +ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm, | |
687 | + int level, | |
688 | + int strategy)); | |
689 | +/* | |
690 | + Dynamically update the compression level and compression strategy. The | |
691 | + interpretation of level and strategy is as in deflateInit2. This can be | |
692 | + used to switch between compression and straight copy of the input data, or | |
693 | + to switch to a different kind of input data requiring a different | |
694 | + strategy. If the compression level is changed, the input available so far | |
695 | + is compressed with the old level (and may be flushed); the new level will | |
696 | + take effect only at the next call of deflate(). | |
697 | + | |
698 | + Before the call of deflateParams, the stream state must be set as for | |
699 | + a call of deflate(), since the currently available input may have to | |
700 | + be compressed and flushed. In particular, strm->avail_out must be non-zero. | |
701 | + | |
702 | + deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source | |
703 | + stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR | |
704 | + if strm->avail_out was zero. | |
705 | +*/ | |
706 | + | |
707 | +ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm, | |
708 | + int good_length, | |
709 | + int max_lazy, | |
710 | + int nice_length, | |
711 | + int max_chain)); | |
712 | +/* | |
713 | + Fine tune deflate's internal compression parameters. This should only be | |
714 | + used by someone who understands the algorithm used by zlib's deflate for | |
715 | + searching for the best matching string, and even then only by the most | |
716 | + fanatic optimizer trying to squeeze out the last compressed bit for their | |
717 | + specific input data. Read the deflate.c source code for the meaning of the | |
718 | + max_lazy, good_length, nice_length, and max_chain parameters. | |
719 | + | |
720 | + deflateTune() can be called after deflateInit() or deflateInit2(), and | |
721 | + returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream. | |
722 | + */ | |
723 | + | |
724 | +ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm, | |
725 | + uLong sourceLen)); | |
726 | +/* | |
727 | + deflateBound() returns an upper bound on the compressed size after | |
728 | + deflation of sourceLen bytes. It must be called after deflateInit() | |
729 | + or deflateInit2(). This would be used to allocate an output buffer | |
730 | + for deflation in a single pass, and so would be called before deflate(). | |
731 | +*/ | |
732 | + | |
733 | +ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm, | |
734 | + int bits, | |
735 | + int value)); | |
736 | +/* | |
737 | + deflatePrime() inserts bits in the deflate output stream. The intent | |
738 | + is that this function is used to start off the deflate output with the | |
739 | + bits leftover from a previous deflate stream when appending to it. As such, | |
740 | + this function can only be used for raw deflate, and must be used before the | |
741 | + first deflate() call after a deflateInit2() or deflateReset(). bits must be | |
742 | + less than or equal to 16, and that many of the least significant bits of | |
743 | + value will be inserted in the output. | |
744 | + | |
745 | + deflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source | |
746 | + stream state was inconsistent. | |
747 | +*/ | |
748 | + | |
749 | +ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm, | |
750 | + gz_headerp head)); | |
751 | +/* | |
752 | + deflateSetHeader() provides gzip header information for when a gzip | |
753 | + stream is requested by deflateInit2(). deflateSetHeader() may be called | |
754 | + after deflateInit2() or deflateReset() and before the first call of | |
755 | + deflate(). The text, time, os, extra field, name, and comment information | |
756 | + in the provided gz_header structure are written to the gzip header (xflag is | |
757 | + ignored -- the extra flags are set according to the compression level). The | |
758 | + caller must assure that, if not Z_NULL, name and comment are terminated with | |
759 | + a zero byte, and that if extra is not Z_NULL, that extra_len bytes are | |
760 | + available there. If hcrc is true, a gzip header crc is included. Note that | |
761 | + the current versions of the command-line version of gzip (up through version | |
762 | + 1.3.x) do not support header crc's, and will report that it is a "multi-part | |
763 | + gzip file" and give up. | |
764 | + | |
765 | + If deflateSetHeader is not used, the default gzip header has text false, | |
766 | + the time set to zero, and os set to 255, with no extra, name, or comment | |
767 | + fields. The gzip header is returned to the default state by deflateReset(). | |
768 | + | |
769 | + deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source | |
770 | + stream state was inconsistent. | |
771 | +*/ | |
772 | + | |
773 | +/* | |
774 | +ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm, | |
775 | + int windowBits)); | |
776 | + | |
777 | + This is another version of inflateInit with an extra parameter. The | |
778 | + fields next_in, avail_in, zalloc, zfree and opaque must be initialized | |
779 | + before by the caller. | |
780 | + | |
781 | + The windowBits parameter is the base two logarithm of the maximum window | |
782 | + size (the size of the history buffer). It should be in the range 8..15 for | |
783 | + this version of the library. The default value is 15 if inflateInit is used | |
784 | + instead. windowBits must be greater than or equal to the windowBits value | |
785 | + provided to deflateInit2() while compressing, or it must be equal to 15 if | |
786 | + deflateInit2() was not used. If a compressed stream with a larger window | |
787 | + size is given as input, inflate() will return with the error code | |
788 | + Z_DATA_ERROR instead of trying to allocate a larger window. | |
789 | + | |
790 | + windowBits can also be -8..-15 for raw inflate. In this case, -windowBits | |
791 | + determines the window size. inflate() will then process raw deflate data, | |
792 | + not looking for a zlib or gzip header, not generating a check value, and not | |
793 | + looking for any check values for comparison at the end of the stream. This | |
794 | + is for use with other formats that use the deflate compressed data format | |
795 | + such as zip. Those formats provide their own check values. If a custom | |
796 | + format is developed using the raw deflate format for compressed data, it is | |
797 | + recommended that a check value such as an adler32 or a crc32 be applied to | |
798 | + the uncompressed data as is done in the zlib, gzip, and zip formats. For | |
799 | + most applications, the zlib format should be used as is. Note that comments | |
800 | + above on the use in deflateInit2() applies to the magnitude of windowBits. | |
801 | + | |
802 | + windowBits can also be greater than 15 for optional gzip decoding. Add | |
803 | + 32 to windowBits to enable zlib and gzip decoding with automatic header | |
804 | + detection, or add 16 to decode only the gzip format (the zlib format will | |
805 | + return a Z_DATA_ERROR). If a gzip stream is being decoded, strm->adler is | |
806 | + a crc32 instead of an adler32. | |
807 | + | |
808 | + inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough | |
809 | + memory, Z_STREAM_ERROR if a parameter is invalid (such as a null strm). msg | |
810 | + is set to null if there is no error message. inflateInit2 does not perform | |
811 | + any decompression apart from reading the zlib header if present: this will | |
812 | + be done by inflate(). (So next_in and avail_in may be modified, but next_out | |
813 | + and avail_out are unchanged.) | |
814 | +*/ | |
815 | + | |
816 | +ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm, | |
817 | + const Bytef *dictionary, | |
818 | + uInt dictLength)); | |
819 | +/* | |
820 | + Initializes the decompression dictionary from the given uncompressed byte | |
821 | + sequence. This function must be called immediately after a call of inflate, | |
822 | + if that call returned Z_NEED_DICT. The dictionary chosen by the compressor | |
823 | + can be determined from the adler32 value returned by that call of inflate. | |
824 | + The compressor and decompressor must use exactly the same dictionary (see | |
825 | + deflateSetDictionary). For raw inflate, this function can be called | |
826 | + immediately after inflateInit2() or inflateReset() and before any call of | |
827 | + inflate() to set the dictionary. The application must insure that the | |
828 | + dictionary that was used for compression is provided. | |
829 | + | |
830 | + inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a | |
831 | + parameter is invalid (such as NULL dictionary) or the stream state is | |
832 | + inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the | |
833 | + expected one (incorrect adler32 value). inflateSetDictionary does not | |
834 | + perform any decompression: this will be done by subsequent calls of | |
835 | + inflate(). | |
836 | +*/ | |
837 | + | |
838 | +ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm)); | |
839 | +/* | |
840 | + Skips invalid compressed data until a full flush point (see above the | |
841 | + description of deflate with Z_FULL_FLUSH) can be found, or until all | |
842 | + available input is skipped. No output is provided. | |
843 | + | |
844 | + inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR | |
845 | + if no more input was provided, Z_DATA_ERROR if no flush point has been found, | |
846 | + or Z_STREAM_ERROR if the stream structure was inconsistent. In the success | |
847 | + case, the application may save the current current value of total_in which | |
848 | + indicates where valid compressed data was found. In the error case, the | |
849 | + application may repeatedly call inflateSync, providing more input each time, | |
850 | + until success or end of the input data. | |
851 | +*/ | |
852 | + | |
853 | +ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest, | |
854 | + z_streamp source)); | |
855 | +/* | |
856 | + Sets the destination stream as a complete copy of the source stream. | |
857 | + | |
858 | + This function can be useful when randomly accessing a large stream. The | |
859 | + first pass through the stream can periodically record the inflate state, | |
860 | + allowing restarting inflate at those points when randomly accessing the | |
861 | + stream. | |
862 | + | |
863 | + inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not | |
864 | + enough memory, Z_STREAM_ERROR if the source stream state was inconsistent | |
865 | + (such as zalloc being NULL). msg is left unchanged in both source and | |
866 | + destination. | |
867 | +*/ | |
868 | + | |
869 | +ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm)); | |
870 | +/* | |
871 | + This function is equivalent to inflateEnd followed by inflateInit, | |
872 | + but does not free and reallocate all the internal decompression state. | |
873 | + The stream will keep attributes that may have been set by inflateInit2. | |
874 | + | |
875 | + inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source | |
876 | + stream state was inconsistent (such as zalloc or state being NULL). | |
877 | +*/ | |
878 | + | |
879 | +ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm, | |
880 | + int bits, | |
881 | + int value)); | |
882 | +/* | |
883 | + This function inserts bits in the inflate input stream. The intent is | |
884 | + that this function is used to start inflating at a bit position in the | |
885 | + middle of a byte. The provided bits will be used before any bytes are used | |
886 | + from next_in. This function should only be used with raw inflate, and | |
887 | + should be used before the first inflate() call after inflateInit2() or | |
888 | + inflateReset(). bits must be less than or equal to 16, and that many of the | |
889 | + least significant bits of value will be inserted in the input. | |
890 | + | |
891 | + inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source | |
892 | + stream state was inconsistent. | |
893 | +*/ | |
894 | + | |
895 | +ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm, | |
896 | + gz_headerp head)); | |
897 | +/* | |
898 | + inflateGetHeader() requests that gzip header information be stored in the | |
899 | + provided gz_header structure. inflateGetHeader() may be called after | |
900 | + inflateInit2() or inflateReset(), and before the first call of inflate(). | |
901 | + As inflate() processes the gzip stream, head->done is zero until the header | |
902 | + is completed, at which time head->done is set to one. If a zlib stream is | |
903 | + being decoded, then head->done is set to -1 to indicate that there will be | |
904 | + no gzip header information forthcoming. Note that Z_BLOCK can be used to | |
905 | + force inflate() to return immediately after header processing is complete | |
906 | + and before any actual data is decompressed. | |
907 | + | |
908 | + The text, time, xflags, and os fields are filled in with the gzip header | |
909 | + contents. hcrc is set to true if there is a header CRC. (The header CRC | |
910 | + was valid if done is set to one.) If extra is not Z_NULL, then extra_max | |
911 | + contains the maximum number of bytes to write to extra. Once done is true, | |
912 | + extra_len contains the actual extra field length, and extra contains the | |
913 | + extra field, or that field truncated if extra_max is less than extra_len. | |
914 | + If name is not Z_NULL, then up to name_max characters are written there, | |
915 | + terminated with a zero unless the length is greater than name_max. If | |
916 | + comment is not Z_NULL, then up to comm_max characters are written there, | |
917 | + terminated with a zero unless the length is greater than comm_max. When | |
918 | + any of extra, name, or comment are not Z_NULL and the respective field is | |
919 | + not present in the header, then that field is set to Z_NULL to signal its | |
920 | + absence. This allows the use of deflateSetHeader() with the returned | |
921 | + structure to duplicate the header. However if those fields are set to | |
922 | + allocated memory, then the application will need to save those pointers | |
923 | + elsewhere so that they can be eventually freed. | |
924 | + | |
925 | + If inflateGetHeader is not used, then the header information is simply | |
926 | + discarded. The header is always checked for validity, including the header | |
927 | + CRC if present. inflateReset() will reset the process to discard the header | |
928 | + information. The application would need to call inflateGetHeader() again to | |
929 | + retrieve the header from the next gzip stream. | |
930 | + | |
931 | + inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source | |
932 | + stream state was inconsistent. | |
933 | +*/ | |
934 | + | |
935 | +/* | |
936 | +ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits, | |
937 | + unsigned char FAR *window)); | |
938 | + | |
939 | + Initialize the internal stream state for decompression using inflateBack() | |
940 | + calls. The fields zalloc, zfree and opaque in strm must be initialized | |
941 | + before the call. If zalloc and zfree are Z_NULL, then the default library- | |
942 | + derived memory allocation routines are used. windowBits is the base two | |
943 | + logarithm of the window size, in the range 8..15. window is a caller | |
944 | + supplied buffer of that size. Except for special applications where it is | |
945 | + assured that deflate was used with small window sizes, windowBits must be 15 | |
946 | + and a 32K byte window must be supplied to be able to decompress general | |
947 | + deflate streams. | |
948 | + | |
949 | + See inflateBack() for the usage of these routines. | |
950 | + | |
951 | + inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of | |
952 | + the paramaters are invalid, Z_MEM_ERROR if the internal state could not | |
953 | + be allocated, or Z_VERSION_ERROR if the version of the library does not | |
954 | + match the version of the header file. | |
955 | +*/ | |
956 | + | |
957 | +typedef unsigned (*in_func) OF((void FAR *, unsigned char FAR * FAR *)); | |
958 | +typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned)); | |
959 | + | |
960 | +ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm, | |
961 | + in_func in, void FAR *in_desc, | |
962 | + out_func out, void FAR *out_desc)); | |
963 | +/* | |
964 | + inflateBack() does a raw inflate with a single call using a call-back | |
965 | + interface for input and output. This is more efficient than inflate() for | |
966 | + file i/o applications in that it avoids copying between the output and the | |
967 | + sliding window by simply making the window itself the output buffer. This | |
968 | + function trusts the application to not change the output buffer passed by | |
969 | + the output function, at least until inflateBack() returns. | |
970 | + | |
971 | + inflateBackInit() must be called first to allocate the internal state | |
972 | + and to initialize the state with the user-provided window buffer. | |
973 | + inflateBack() may then be used multiple times to inflate a complete, raw | |
974 | + deflate stream with each call. inflateBackEnd() is then called to free | |
975 | + the allocated state. | |
976 | + | |
977 | + A raw deflate stream is one with no zlib or gzip header or trailer. | |
978 | + This routine would normally be used in a utility that reads zip or gzip | |
979 | + files and writes out uncompressed files. The utility would decode the | |
980 | + header and process the trailer on its own, hence this routine expects | |
981 | + only the raw deflate stream to decompress. This is different from the | |
982 | + normal behavior of inflate(), which expects either a zlib or gzip header and | |
983 | + trailer around the deflate stream. | |
984 | + | |
985 | + inflateBack() uses two subroutines supplied by the caller that are then | |
986 | + called by inflateBack() for input and output. inflateBack() calls those | |
987 | + routines until it reads a complete deflate stream and writes out all of the | |
988 | + uncompressed data, or until it encounters an error. The function's | |
989 | + parameters and return types are defined above in the in_func and out_func | |
990 | + typedefs. inflateBack() will call in(in_desc, &buf) which should return the | |
991 | + number of bytes of provided input, and a pointer to that input in buf. If | |
992 | + there is no input available, in() must return zero--buf is ignored in that | |
993 | + case--and inflateBack() will return a buffer error. inflateBack() will call | |
994 | + out(out_desc, buf, len) to write the uncompressed data buf[0..len-1]. out() | |
995 | + should return zero on success, or non-zero on failure. If out() returns | |
996 | + non-zero, inflateBack() will return with an error. Neither in() nor out() | |
997 | + are permitted to change the contents of the window provided to | |
998 | + inflateBackInit(), which is also the buffer that out() uses to write from. | |
999 | + The length written by out() will be at most the window size. Any non-zero | |
1000 | + amount of input may be provided by in(). | |
1001 | + | |
1002 | + For convenience, inflateBack() can be provided input on the first call by | |
1003 | + setting strm->next_in and strm->avail_in. If that input is exhausted, then | |
1004 | + in() will be called. Therefore strm->next_in must be initialized before | |
1005 | + calling inflateBack(). If strm->next_in is Z_NULL, then in() will be called | |
1006 | + immediately for input. If strm->next_in is not Z_NULL, then strm->avail_in | |
1007 | + must also be initialized, and then if strm->avail_in is not zero, input will | |
1008 | + initially be taken from strm->next_in[0 .. strm->avail_in - 1]. | |
1009 | + | |
1010 | + The in_desc and out_desc parameters of inflateBack() is passed as the | |
1011 | + first parameter of in() and out() respectively when they are called. These | |
1012 | + descriptors can be optionally used to pass any information that the caller- | |
1013 | + supplied in() and out() functions need to do their job. | |
1014 | + | |
1015 | + On return, inflateBack() will set strm->next_in and strm->avail_in to | |
1016 | + pass back any unused input that was provided by the last in() call. The | |
1017 | + return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR | |
1018 | + if in() or out() returned an error, Z_DATA_ERROR if there was a format | |
1019 | + error in the deflate stream (in which case strm->msg is set to indicate the | |
1020 | + nature of the error), or Z_STREAM_ERROR if the stream was not properly | |
1021 | + initialized. In the case of Z_BUF_ERROR, an input or output error can be | |
1022 | + distinguished using strm->next_in which will be Z_NULL only if in() returned | |
1023 | + an error. If strm->next is not Z_NULL, then the Z_BUF_ERROR was due to | |
1024 | + out() returning non-zero. (in() will always be called before out(), so | |
1025 | + strm->next_in is assured to be defined if out() returns non-zero.) Note | |
1026 | + that inflateBack() cannot return Z_OK. | |
1027 | +*/ | |
1028 | + | |
1029 | +ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm)); | |
1030 | +/* | |
1031 | + All memory allocated by inflateBackInit() is freed. | |
1032 | + | |
1033 | + inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream | |
1034 | + state was inconsistent. | |
1035 | +*/ | |
1036 | + | |
1037 | +ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void)); | |
1038 | +/* Return flags indicating compile-time options. | |
1039 | + | |
1040 | + Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other: | |
1041 | + 1.0: size of uInt | |
1042 | + 3.2: size of uLong | |
1043 | + 5.4: size of voidpf (pointer) | |
1044 | + 7.6: size of z_off_t | |
1045 | + | |
1046 | + Compiler, assembler, and debug options: | |
1047 | + 8: DEBUG | |
1048 | + 9: ASMV or ASMINF -- use ASM code | |
1049 | + 10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention | |
1050 | + 11: 0 (reserved) | |
1051 | + | |
1052 | + One-time table building (smaller code, but not thread-safe if true): | |
1053 | + 12: BUILDFIXED -- build static block decoding tables when needed | |
1054 | + 13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed | |
1055 | + 14,15: 0 (reserved) | |
1056 | + | |
1057 | + Library content (indicates missing functionality): | |
1058 | + 16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking | |
1059 | + deflate code when not needed) | |
1060 | + 17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect | |
1061 | + and decode gzip streams (to avoid linking crc code) | |
1062 | + 18-19: 0 (reserved) | |
1063 | + | |
1064 | + Operation variations (changes in library functionality): | |
1065 | + 20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate | |
1066 | + 21: FASTEST -- deflate algorithm with only one, lowest compression level | |
1067 | + 22,23: 0 (reserved) | |
1068 | + | |
1069 | + The sprintf variant used by gzprintf (zero is best): | |
1070 | + 24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format | |
1071 | + 25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure! | |
1072 | + 26: 0 = returns value, 1 = void -- 1 means inferred string length returned | |
1073 | + | |
1074 | + Remainder: | |
1075 | + 27-31: 0 (reserved) | |
1076 | + */ | |
1077 | + | |
1078 | + | |
1079 | + /* utility functions */ | |
1080 | + | |
1081 | +/* | |
1082 | + The following utility functions are implemented on top of the | |
1083 | + basic stream-oriented functions. To simplify the interface, some | |
1084 | + default options are assumed (compression level and memory usage, | |
1085 | + standard memory allocation functions). The source code of these | |
1086 | + utility functions can easily be modified if you need special options. | |
1087 | +*/ | |
1088 | + | |
1089 | +ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen, | |
1090 | + const Bytef *source, uLong sourceLen)); | |
1091 | +/* | |
1092 | + Compresses the source buffer into the destination buffer. sourceLen is | |
1093 | + the byte length of the source buffer. Upon entry, destLen is the total | |
1094 | + size of the destination buffer, which must be at least the value returned | |
1095 | + by compressBound(sourceLen). Upon exit, destLen is the actual size of the | |
1096 | + compressed buffer. | |
1097 | + This function can be used to compress a whole file at once if the | |
1098 | + input file is mmap'ed. | |
1099 | + compress returns Z_OK if success, Z_MEM_ERROR if there was not | |
1100 | + enough memory, Z_BUF_ERROR if there was not enough room in the output | |
1101 | + buffer. | |
1102 | +*/ | |
1103 | + | |
1104 | +ZEXTERN int ZEXPORT lzma_compress OF((Bytef *dest, uLongf *destLen, | |
1105 | + const Bytef *source, uLong sourceLen, | |
1106 | + int level)); | |
1107 | +/* | |
1108 | + Compresses the source buffer into the destination buffer. The level | |
1109 | + parameter has the same meaning as in deflateInit. sourceLen is the byte | |
1110 | + length of the source buffer. Upon entry, destLen is the total size of the | |
1111 | + destination buffer, which must be at least the value returned by | |
1112 | + compressBound(sourceLen). Upon exit, destLen is the actual size of the | |
1113 | + compressed buffer. | |
1114 | + | |
1115 | + compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough | |
1116 | + memory, Z_BUF_ERROR if there was not enough room in the output buffer, | |
1117 | + Z_STREAM_ERROR if the level parameter is invalid. | |
1118 | +*/ | |
1119 | + | |
1120 | +ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen)); | |
1121 | +/* | |
1122 | + compressBound() returns an upper bound on the compressed size after | |
1123 | + compress() or compress2() on sourceLen bytes. It would be used before | |
1124 | + a compress() or compress2() call to allocate the destination buffer. | |
1125 | +*/ | |
1126 | + | |
1127 | +ZEXTERN int ZEXPORT lzma_uncompress OF((Bytef *dest, uLongf *destLen, | |
1128 | + const Bytef *source, uLong sourceLen)); | |
1129 | +/* | |
1130 | + Decompresses the source buffer into the destination buffer. sourceLen is | |
1131 | + the byte length of the source buffer. Upon entry, destLen is the total | |
1132 | + size of the destination buffer, which must be large enough to hold the | |
1133 | + entire uncompressed data. (The size of the uncompressed data must have | |
1134 | + been saved previously by the compressor and transmitted to the decompressor | |
1135 | + by some mechanism outside the scope of this compression library.) | |
1136 | + Upon exit, destLen is the actual size of the compressed buffer. | |
1137 | + This function can be used to decompress a whole file at once if the | |
1138 | + input file is mmap'ed. | |
1139 | + | |
1140 | + uncompress returns Z_OK if success, Z_MEM_ERROR if there was not | |
1141 | + enough memory, Z_BUF_ERROR if there was not enough room in the output | |
1142 | + buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete. | |
1143 | +*/ | |
1144 | + | |
1145 | + | |
1146 | +typedef voidp gzFile; | |
1147 | + | |
1148 | +ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode)); | |
1149 | +/* | |
1150 | + Opens a gzip (.gz) file for reading or writing. The mode parameter | |
1151 | + is as in fopen ("rb" or "wb") but can also include a compression level | |
1152 | + ("wb9") or a strategy: 'f' for filtered data as in "wb6f", 'h' for | |
1153 | + Huffman only compression as in "wb1h", or 'R' for run-length encoding | |
1154 | + as in "wb1R". (See the description of deflateInit2 for more information | |
1155 | + about the strategy parameter.) | |
1156 | + | |
1157 | + gzopen can be used to read a file which is not in gzip format; in this | |
1158 | + case gzread will directly read from the file without decompression. | |
1159 | + | |
1160 | + gzopen returns NULL if the file could not be opened or if there was | |
1161 | + insufficient memory to allocate the (de)compression state; errno | |
1162 | + can be checked to distinguish the two cases (if errno is zero, the | |
1163 | + zlib error is Z_MEM_ERROR). */ | |
1164 | + | |
1165 | +ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode)); | |
1166 | +/* | |
1167 | + gzdopen() associates a gzFile with the file descriptor fd. File | |
1168 | + descriptors are obtained from calls like open, dup, creat, pipe or | |
1169 | + fileno (in the file has been previously opened with fopen). | |
1170 | + The mode parameter is as in gzopen. | |
1171 | + The next call of gzclose on the returned gzFile will also close the | |
1172 | + file descriptor fd, just like fclose(fdopen(fd), mode) closes the file | |
1173 | + descriptor fd. If you want to keep fd open, use gzdopen(dup(fd), mode). | |
1174 | + gzdopen returns NULL if there was insufficient memory to allocate | |
1175 | + the (de)compression state. | |
1176 | +*/ | |
1177 | + | |
1178 | +ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy)); | |
1179 | +/* | |
1180 | + Dynamically update the compression level or strategy. See the description | |
1181 | + of deflateInit2 for the meaning of these parameters. | |
1182 | + gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not | |
1183 | + opened for writing. | |
1184 | +*/ | |
1185 | + | |
1186 | +ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len)); | |
1187 | +/* | |
1188 | + Reads the given number of uncompressed bytes from the compressed file. | |
1189 | + If the input file was not in gzip format, gzread copies the given number | |
1190 | + of bytes into the buffer. | |
1191 | + gzread returns the number of uncompressed bytes actually read (0 for | |
1192 | + end of file, -1 for error). */ | |
1193 | + | |
1194 | +ZEXTERN int ZEXPORT gzwrite OF((gzFile file, | |
1195 | + voidpc buf, unsigned len)); | |
1196 | +/* | |
1197 | + Writes the given number of uncompressed bytes into the compressed file. | |
1198 | + gzwrite returns the number of uncompressed bytes actually written | |
1199 | + (0 in case of error). | |
1200 | +*/ | |
1201 | + | |
1202 | +ZEXTERN int ZEXPORTVA gzprintf OF((gzFile file, const char *format, ...)); | |
1203 | +/* | |
1204 | + Converts, formats, and writes the args to the compressed file under | |
1205 | + control of the format string, as in fprintf. gzprintf returns the number of | |
1206 | + uncompressed bytes actually written (0 in case of error). The number of | |
1207 | + uncompressed bytes written is limited to 4095. The caller should assure that | |
1208 | + this limit is not exceeded. If it is exceeded, then gzprintf() will return | |
1209 | + return an error (0) with nothing written. In this case, there may also be a | |
1210 | + buffer overflow with unpredictable consequences, which is possible only if | |
1211 | + zlib was compiled with the insecure functions sprintf() or vsprintf() | |
1212 | + because the secure snprintf() or vsnprintf() functions were not available. | |
1213 | +*/ | |
1214 | + | |
1215 | +ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s)); | |
1216 | +/* | |
1217 | + Writes the given null-terminated string to the compressed file, excluding | |
1218 | + the terminating null character. | |
1219 | + gzputs returns the number of characters written, or -1 in case of error. | |
1220 | +*/ | |
1221 | + | |
1222 | +ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len)); | |
1223 | +/* | |
1224 | + Reads bytes from the compressed file until len-1 characters are read, or | |
1225 | + a newline character is read and transferred to buf, or an end-of-file | |
1226 | + condition is encountered. The string is then terminated with a null | |
1227 | + character. | |
1228 | + gzgets returns buf, or Z_NULL in case of error. | |
1229 | +*/ | |
1230 | + | |
1231 | +ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c)); | |
1232 | +/* | |
1233 | + Writes c, converted to an unsigned char, into the compressed file. | |
1234 | + gzputc returns the value that was written, or -1 in case of error. | |
1235 | +*/ | |
1236 | + | |
1237 | +ZEXTERN int ZEXPORT gzgetc OF((gzFile file)); | |
1238 | +/* | |
1239 | + Reads one byte from the compressed file. gzgetc returns this byte | |
1240 | + or -1 in case of end of file or error. | |
1241 | +*/ | |
1242 | + | |
1243 | +ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file)); | |
1244 | +/* | |
1245 | + Push one character back onto the stream to be read again later. | |
1246 | + Only one character of push-back is allowed. gzungetc() returns the | |
1247 | + character pushed, or -1 on failure. gzungetc() will fail if a | |
1248 | + character has been pushed but not read yet, or if c is -1. The pushed | |
1249 | + character will be discarded if the stream is repositioned with gzseek() | |
1250 | + or gzrewind(). | |
1251 | +*/ | |
1252 | + | |
1253 | +ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush)); | |
1254 | +/* | |
1255 | + Flushes all pending output into the compressed file. The parameter | |
1256 | + flush is as in the deflate() function. The return value is the zlib | |
1257 | + error number (see function gzerror below). gzflush returns Z_OK if | |
1258 | + the flush parameter is Z_FINISH and all output could be flushed. | |
1259 | + gzflush should be called only when strictly necessary because it can | |
1260 | + degrade compression. | |
1261 | +*/ | |
1262 | + | |
1263 | +ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file, | |
1264 | + z_off_t offset, int whence)); | |
1265 | +/* | |
1266 | + Sets the starting position for the next gzread or gzwrite on the | |
1267 | + given compressed file. The offset represents a number of bytes in the | |
1268 | + uncompressed data stream. The whence parameter is defined as in lseek(2); | |
1269 | + the value SEEK_END is not supported. | |
1270 | + If the file is opened for reading, this function is emulated but can be | |
1271 | + extremely slow. If the file is opened for writing, only forward seeks are | |
1272 | + supported; gzseek then compresses a sequence of zeroes up to the new | |
1273 | + starting position. | |
1274 | + | |
1275 | + gzseek returns the resulting offset location as measured in bytes from | |
1276 | + the beginning of the uncompressed stream, or -1 in case of error, in | |
1277 | + particular if the file is opened for writing and the new starting position | |
1278 | + would be before the current position. | |
1279 | +*/ | |
1280 | + | |
1281 | +ZEXTERN int ZEXPORT gzrewind OF((gzFile file)); | |
1282 | +/* | |
1283 | + Rewinds the given file. This function is supported only for reading. | |
1284 | + | |
1285 | + gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET) | |
1286 | +*/ | |
1287 | + | |
1288 | +ZEXTERN z_off_t ZEXPORT gztell OF((gzFile file)); | |
1289 | +/* | |
1290 | + Returns the starting position for the next gzread or gzwrite on the | |
1291 | + given compressed file. This position represents a number of bytes in the | |
1292 | + uncompressed data stream. | |
1293 | + | |
1294 | + gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR) | |
1295 | +*/ | |
1296 | + | |
1297 | +ZEXTERN int ZEXPORT gzeof OF((gzFile file)); | |
1298 | +/* | |
1299 | + Returns 1 when EOF has previously been detected reading the given | |
1300 | + input stream, otherwise zero. | |
1301 | +*/ | |
1302 | + | |
1303 | +ZEXTERN int ZEXPORT gzdirect OF((gzFile file)); | |
1304 | +/* | |
1305 | + Returns 1 if file is being read directly without decompression, otherwise | |
1306 | + zero. | |
1307 | +*/ | |
1308 | + | |
1309 | +ZEXTERN int ZEXPORT gzclose OF((gzFile file)); | |
1310 | +/* | |
1311 | + Flushes all pending output if necessary, closes the compressed file | |
1312 | + and deallocates all the (de)compression state. The return value is the zlib | |
1313 | + error number (see function gzerror below). Note that even when an error | |
1314 | + is returned the file will be closed so gzerror cannot be called. | |
1315 | +*/ | |
1316 | + | |
1317 | +ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum)); | |
1318 | +/* | |
1319 | + Returns the error message for the last error which occurred on the | |
1320 | + given compressed file. errnum is set to zlib error number. If an | |
1321 | + error occurred in the file system and not in the compression library, | |
1322 | + errnum is set to Z_ERRNO and the application may consult errno | |
1323 | + to get the exact error code. | |
1324 | + | |
1325 | + The application must not modify the returned string and future calls to | |
1326 | + this function may invalidate the returned string. | |
1327 | +*/ | |
1328 | + | |
1329 | +ZEXTERN void ZEXPORT gzclearerr OF((gzFile file)); | |
1330 | +/* | |
1331 | + Clears the error and end-of-file flags for file. This is analogous to the | |
1332 | + clearerr() function in stdio. This is useful for continuing to read a gzip | |
1333 | + file that is being written concurrently. | |
1334 | +*/ | |
1335 | + | |
1336 | + /* checksum functions */ | |
1337 | + | |
1338 | +/* | |
1339 | + These functions are not related to compression but are exported | |
1340 | + anyway because they might be useful in applications using the | |
1341 | + compression library. | |
1342 | +*/ | |
1343 | + | |
1344 | +ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len)); | |
1345 | +/* | |
1346 | + Update a running Adler-32 checksum with the bytes buf[0..len-1] and | |
1347 | + return the updated checksum. If buf is NULL, this function returns | |
1348 | + the required initial value for the checksum. | |
1349 | + An Adler-32 checksum is almost as reliable as a CRC32 but can be computed | |
1350 | + much faster. Usage example: | |
1351 | + | |
1352 | + uLong adler = adler32(0L, Z_NULL, 0); | |
1353 | + | |
1354 | + while (read_buffer(buffer, length) != EOF) { | |
1355 | + adler = adler32(adler, buffer, length); | |
1356 | + } | |
1357 | + if (adler != original_adler) error(); | |
1358 | +*/ | |
1359 | + | |
1360 | +ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2, | |
1361 | + z_off_t len2)); | |
1362 | +/* | |
1363 | + Combine two Adler-32 checksums into one. For two sequences of bytes, seq1 | |
1364 | + and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for | |
1365 | + each, adler1 and adler2. adler32_combine() returns the Adler-32 checksum of | |
1366 | + seq1 and seq2 concatenated, requiring only adler1, adler2, and len2. | |
1367 | +*/ | |
1368 | + | |
1369 | +ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len)); | |
1370 | +/* | |
1371 | + Update a running CRC-32 with the bytes buf[0..len-1] and return the | |
1372 | + updated CRC-32. If buf is NULL, this function returns the required initial | |
1373 | + value for the for the crc. Pre- and post-conditioning (one's complement) is | |
1374 | + performed within this function so it shouldn't be done by the application. | |
1375 | + Usage example: | |
1376 | + | |
1377 | + uLong crc = crc32(0L, Z_NULL, 0); | |
1378 | + | |
1379 | + while (read_buffer(buffer, length) != EOF) { | |
1380 | + crc = crc32(crc, buffer, length); | |
1381 | + } | |
1382 | + if (crc != original_crc) error(); | |
1383 | +*/ | |
1384 | + | |
1385 | +ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2)); | |
1386 | + | |
1387 | +/* | |
1388 | + Combine two CRC-32 check values into one. For two sequences of bytes, | |
1389 | + seq1 and seq2 with lengths len1 and len2, CRC-32 check values were | |
1390 | + calculated for each, crc1 and crc2. crc32_combine() returns the CRC-32 | |
1391 | + check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and | |
1392 | + len2. | |
1393 | +*/ | |
1394 | + | |
1395 | + | |
1396 | + /* various hacks, don't look :) */ | |
1397 | + | |
1398 | +/* deflateInit and inflateInit are macros to allow checking the zlib version | |
1399 | + * and the compiler's view of z_stream: | |
1400 | + */ | |
1401 | +ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level, | |
1402 | + const char *version, int stream_size)); | |
1403 | +ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm, | |
1404 | + const char *version, int stream_size)); | |
1405 | +ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int level, int method, | |
1406 | + int windowBits, int memLevel, | |
1407 | + int strategy, const char *version, | |
1408 | + int stream_size)); | |
1409 | +ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int windowBits, | |
1410 | + const char *version, int stream_size)); | |
1411 | +ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits, | |
1412 | + unsigned char FAR *window, | |
1413 | + const char *version, | |
1414 | + int stream_size)); | |
1415 | +#define deflateInit(strm, level) \ | |
1416 | + deflateInit_((strm), (level), ZLIB_VERSION, sizeof(z_stream)) | |
1417 | +#define inflateInit(strm) \ | |
1418 | + inflateInit_((strm), ZLIB_VERSION, sizeof(z_stream)) | |
1419 | +#define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ | |
1420 | + deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\ | |
1421 | + (strategy), ZLIB_VERSION, sizeof(z_stream)) | |
1422 | +#define inflateInit2(strm, windowBits) \ | |
1423 | + inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream)) | |
1424 | +#define inflateBackInit(strm, windowBits, window) \ | |
1425 | + inflateBackInit_((strm), (windowBits), (window), \ | |
1426 | + ZLIB_VERSION, sizeof(z_stream)) | |
1427 | + | |
1428 | + | |
1429 | +#if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL) | |
1430 | + struct internal_state {int dummy;}; /* hack for buggy compilers */ | |
1431 | +#endif | |
1432 | + | |
1433 | +ZEXTERN const char * ZEXPORT zError OF((int)); | |
1434 | +ZEXTERN int ZEXPORT inflateSyncPoint OF((z_streamp z)); | |
1435 | +ZEXTERN const uLongf * ZEXPORT get_crc_table OF((void)); | |
1436 | + | |
1437 | +#ifdef __cplusplus | |
1438 | +} | |
1439 | +#endif | |
1440 | + | |
1441 | +#endif /* ZLIB_H */ |