1 | #ifndef ZLIB_H_ |
2 | #define ZLIB_H_ |
3 | /* zlib.h -- interface of the 'zlib-ng' compression library |
4 | Forked from and compatible with zlib 1.2.11 |
5 | |
6 | Copyright (C) 1995-2016 Jean-loup Gailly and Mark Adler |
7 | |
8 | This software is provided 'as-is', without any express or implied |
9 | warranty. In no event will the authors be held liable for any damages |
10 | arising from the use of this software. |
11 | |
12 | Permission is granted to anyone to use this software for any purpose, |
13 | including commercial applications, and to alter it and redistribute it |
14 | freely, subject to the following restrictions: |
15 | |
16 | 1. The origin of this software must not be misrepresented; you must not |
17 | claim that you wrote the original software. If you use this software |
18 | in a product, an acknowledgment in the product documentation would be |
19 | appreciated but is not required. |
20 | 2. Altered source versions must be plainly marked as such, and must not be |
21 | misrepresented as being the original software. |
22 | 3. This notice may not be removed or altered from any source distribution. |
23 | |
24 | Jean-loup Gailly Mark Adler |
25 | jloup@gzip.org madler@alumni.caltech.edu |
26 | |
27 | |
28 | The data format used by the zlib library is described by RFCs (Request for |
29 | Comments) 1950 to 1952 in the files http://tools.ietf.org/html/rfc1950 |
30 | (zlib format), rfc1951 (deflate format) and rfc1952 (gzip format). |
31 | */ |
32 | |
33 | #include <stdint.h> |
34 | #include <stdarg.h> |
35 | #include "zconf.h" |
36 | |
37 | #ifdef __cplusplus |
38 | extern "C" { |
39 | #endif |
40 | |
41 | #define ZLIBNG_VERSION "1.9.9" |
42 | #define ZLIBNG_VERNUM 0x1990 |
43 | #define ZLIBNG_VER_MAJOR 1 |
44 | #define ZLIBNG_VER_MINOR 9 |
45 | #define ZLIBNG_VER_REVISION 9 |
46 | #define ZLIBNG_VER_SUBREVISION 0 |
47 | |
48 | #define ZLIB_VERSION "1.2.11.zlib-ng" |
49 | #define ZLIB_VERNUM 0x12bf |
50 | #define ZLIB_VER_MAJOR 1 |
51 | #define ZLIB_VER_MINOR 2 |
52 | #define ZLIB_VER_REVISION 11 |
53 | #define ZLIB_VER_SUBREVISION 0 |
54 | |
55 | /* |
56 | The 'zlib' compression library provides in-memory compression and |
57 | decompression functions, including integrity checks of the uncompressed data. |
58 | This version of the library supports only one compression method (deflation) |
59 | but other algorithms will be added later and will have the same stream |
60 | interface. |
61 | |
62 | Compression can be done in a single step if the buffers are large enough, |
63 | or can be done by repeated calls of the compression function. In the latter |
64 | case, the application must provide more input and/or consume the output |
65 | (providing more output space) before each call. |
66 | |
67 | The compressed data format used by default by the in-memory functions is |
68 | the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped |
69 | around a deflate stream, which is itself documented in RFC 1951. |
70 | |
71 | The library also supports reading and writing files in gzip (.gz) format |
72 | with an interface similar to that of stdio using the functions that start |
73 | with "gz". The gzip format is different from the zlib format. gzip is a |
74 | gzip wrapper, documented in RFC 1952, wrapped around a deflate stream. |
75 | |
76 | This library can optionally read and write gzip and raw deflate streams in |
77 | memory as well. |
78 | |
79 | The zlib format was designed to be compact and fast for use in memory |
80 | and on communications channels. The gzip format was designed for single- |
81 | file compression on file systems, has a larger header than zlib to maintain |
82 | directory information, and uses a different, slower check method than zlib. |
83 | |
84 | The library does not install any signal handler. The decoder checks |
85 | the consistency of the compressed data, so the library should never crash |
86 | even in the case of corrupted input. |
87 | */ |
88 | |
89 | typedef void *(*alloc_func) (void *opaque, unsigned int items, unsigned int size); |
90 | typedef void (*free_func) (void *opaque, void *address); |
91 | |
92 | struct internal_state; |
93 | |
94 | typedef struct z_stream_s { |
95 | const unsigned char *next_in; /* next input byte */ |
96 | uint32_t avail_in; /* number of bytes available at next_in */ |
97 | size_t total_in; /* total number of input bytes read so far */ |
98 | |
99 | unsigned char *next_out; /* next output byte will go here */ |
100 | uint32_t avail_out; /* remaining free space at next_out */ |
101 | size_t total_out; /* total number of bytes output so far */ |
102 | |
103 | const char *msg; /* last error message, NULL if no error */ |
104 | struct internal_state *state; /* not visible by applications */ |
105 | |
106 | alloc_func zalloc; /* used to allocate the internal state */ |
107 | free_func zfree; /* used to free the internal state */ |
108 | void *opaque; /* private data object passed to zalloc and zfree */ |
109 | |
110 | int data_type; /* best guess about the data type: binary or text |
111 | for deflate, or the decoding state for inflate */ |
112 | unsigned long adler; /* Adler-32 or CRC-32 value of the uncompressed data */ |
113 | unsigned long reserved; /* reserved for future use */ |
114 | } z_stream; |
115 | |
116 | typedef z_stream *z_streamp; /* Obsolete type, retained for compatibility only */ |
117 | |
118 | /* |
119 | gzip header information passed to and from zlib routines. See RFC 1952 |
120 | for more details on the meanings of these fields. |
121 | */ |
122 | typedef struct { |
123 | int ; /* true if compressed data believed to be text */ |
124 | unsigned long ; /* modification time */ |
125 | int ; /* extra flags (not used when writing a gzip file) */ |
126 | int ; /* operating system */ |
127 | unsigned char *; /* pointer to extra field or NULL if none */ |
128 | unsigned int ; /* extra field length (valid if extra != NULL) */ |
129 | unsigned int ; /* space at extra (only when reading header) */ |
130 | unsigned char *; /* pointer to zero-terminated file name or NULL */ |
131 | unsigned int ; /* space at name (only when reading header) */ |
132 | unsigned char *; /* pointer to zero-terminated comment or NULL */ |
133 | unsigned int ; /* space at comment (only when reading header) */ |
134 | int ; /* true if there was or will be a header crc */ |
135 | int ; /* true when done reading gzip header (not used when writing a gzip file) */ |
136 | } ; |
137 | |
138 | typedef gz_header *; |
139 | |
140 | /* |
141 | The application must update next_in and avail_in when avail_in has dropped |
142 | to zero. It must update next_out and avail_out when avail_out has dropped |
143 | to zero. The application must initialize zalloc, zfree and opaque before |
144 | calling the init function. All other fields are set by the compression |
145 | library and must not be updated by the application. |
146 | |
147 | The opaque value provided by the application will be passed as the first |
148 | parameter for calls of zalloc and zfree. This can be useful for custom |
149 | memory management. The compression library attaches no meaning to the |
150 | opaque value. |
151 | |
152 | zalloc must return NULL if there is not enough memory for the object. |
153 | If zlib is used in a multi-threaded application, zalloc and zfree must be |
154 | thread safe. In that case, zlib is thread-safe. When zalloc and zfree are |
155 | Z_NULL on entry to the initialization function, they are set to internal |
156 | routines that use the standard library functions malloc() and free(). |
157 | |
158 | The fields total_in and total_out can be used for statistics or progress |
159 | reports. After compression, total_in holds the total size of the |
160 | uncompressed data and may be saved for use by the decompressor (particularly |
161 | if the decompressor wants to decompress everything in a single step). |
162 | */ |
163 | |
164 | /* constants */ |
165 | |
166 | #define Z_NO_FLUSH 0 |
167 | #define Z_PARTIAL_FLUSH 1 |
168 | #define Z_SYNC_FLUSH 2 |
169 | #define Z_FULL_FLUSH 3 |
170 | #define Z_FINISH 4 |
171 | #define Z_BLOCK 5 |
172 | #define Z_TREES 6 |
173 | /* Allowed flush values; see deflate() and inflate() below for details */ |
174 | |
175 | #define Z_OK 0 |
176 | #define Z_STREAM_END 1 |
177 | #define Z_NEED_DICT 2 |
178 | #define Z_ERRNO (-1) |
179 | #define Z_STREAM_ERROR (-2) |
180 | #define Z_DATA_ERROR (-3) |
181 | #define Z_MEM_ERROR (-4) |
182 | #define Z_BUF_ERROR (-5) |
183 | #define Z_VERSION_ERROR (-6) |
184 | /* Return codes for the compression/decompression functions. Negative values |
185 | * are errors, positive values are used for special but normal events. |
186 | */ |
187 | |
188 | #define Z_NO_COMPRESSION 0 |
189 | #define Z_BEST_SPEED 1 |
190 | #define Z_BEST_COMPRESSION 9 |
191 | #define Z_DEFAULT_COMPRESSION (-1) |
192 | /* compression levels */ |
193 | |
194 | #define Z_FILTERED 1 |
195 | #define Z_HUFFMAN_ONLY 2 |
196 | #define Z_RLE 3 |
197 | #define Z_FIXED 4 |
198 | #define Z_DEFAULT_STRATEGY 0 |
199 | /* compression strategy; see deflateInit2() below for details */ |
200 | |
201 | #define Z_BINARY 0 |
202 | #define Z_TEXT 1 |
203 | #define Z_ASCII Z_TEXT /* for compatibility with 1.2.2 and earlier */ |
204 | #define Z_UNKNOWN 2 |
205 | /* Possible values of the data_type field for deflate() */ |
206 | |
207 | #define Z_DEFLATED 8 |
208 | /* The deflate compression method (the only one supported in this version) */ |
209 | |
210 | #define Z_NULL NULL /* for compatibility with zlib, was for initializing zalloc, zfree, opaque */ |
211 | |
212 | #define zlib_version zlibVersion() |
213 | /* for compatibility with versions < 1.0.2 */ |
214 | |
215 | |
216 | /* basic functions */ |
217 | |
218 | ZEXTERN const char * ZEXPORT zlibVersion(void); |
219 | /* The application can compare zlibVersion and ZLIB_VERSION for consistency. |
220 | If the first character differs, the library code actually used is not |
221 | compatible with the zlib.h header file used by the application. This check |
222 | is automatically made by deflateInit and inflateInit. |
223 | */ |
224 | |
225 | /* |
226 | ZEXTERN int ZEXPORT deflateInit (z_stream *strm, int level); |
227 | |
228 | Initializes the internal stream state for compression. The fields |
229 | zalloc, zfree and opaque must be initialized before by the caller. If |
230 | zalloc and zfree are set to NULL, deflateInit updates them to use default |
231 | allocation functions. |
232 | |
233 | The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9: |
234 | 1 gives best speed, 9 gives best compression, 0 gives no compression at all |
235 | (the input data is simply copied a block at a time). Z_DEFAULT_COMPRESSION |
236 | requests a default compromise between speed and compression (currently |
237 | equivalent to level 6). |
238 | |
239 | deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough |
240 | memory, Z_STREAM_ERROR if level is not a valid compression level, or |
241 | Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible |
242 | with the version assumed by the caller (ZLIB_VERSION). msg is set to null |
243 | if there is no error message. deflateInit does not perform any compression: |
244 | this will be done by deflate(). |
245 | */ |
246 | |
247 | |
248 | ZEXTERN int ZEXPORT deflate(z_stream *strm, int flush); |
249 | /* |
250 | deflate compresses as much data as possible, and stops when the input |
251 | buffer becomes empty or the output buffer becomes full. It may introduce |
252 | some output latency (reading input without producing any output) except when |
253 | forced to flush. |
254 | |
255 | The detailed semantics are as follows. deflate performs one or both of the |
256 | following actions: |
257 | |
258 | - Compress more input starting at next_in and update next_in and avail_in |
259 | accordingly. If not all input can be processed (because there is not |
260 | enough room in the output buffer), next_in and avail_in are updated and |
261 | processing will resume at this point for the next call of deflate(). |
262 | |
263 | - Generate more output starting at next_out and update next_out and avail_out |
264 | accordingly. This action is forced if the parameter flush is non zero. |
265 | Forcing flush frequently degrades the compression ratio, so this parameter |
266 | should be set only when necessary. Some output may be provided even if |
267 | flush is zero. |
268 | |
269 | Before the call of deflate(), the application should ensure that at least |
270 | one of the actions is possible, by providing more input and/or consuming more |
271 | output, and updating avail_in or avail_out accordingly; avail_out should |
272 | never be zero before the call. The application can consume the compressed |
273 | output when it wants, for example when the output buffer is full (avail_out |
274 | == 0), or after each call of deflate(). If deflate returns Z_OK and with |
275 | zero avail_out, it must be called again after making room in the output |
276 | buffer because there might be more output pending. See deflatePending(), |
277 | which can be used if desired to determine whether or not there is more ouput |
278 | in that case. |
279 | |
280 | Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to |
281 | decide how much data to accumulate before producing output, in order to |
282 | maximize compression. |
283 | |
284 | If the parameter flush is set to Z_SYNC_FLUSH, all pending output is |
285 | flushed to the output buffer and the output is aligned on a byte boundary, so |
286 | that the decompressor can get all input data available so far. (In |
287 | particular avail_in is zero after the call if enough output space has been |
288 | provided before the call.) Flushing may degrade compression for some |
289 | compression algorithms and so it should be used only when necessary. This |
290 | completes the current deflate block and follows it with an empty stored block |
291 | that is three bits plus filler bits to the next byte, followed by four bytes |
292 | (00 00 ff ff). |
293 | |
294 | If flush is set to Z_PARTIAL_FLUSH, all pending output is flushed to the |
295 | output buffer, but the output is not aligned to a byte boundary. All of the |
296 | input data so far will be available to the decompressor, as for Z_SYNC_FLUSH. |
297 | This completes the current deflate block and follows it with an empty fixed |
298 | codes block that is 10 bits long. This assures that enough bytes are output |
299 | in order for the decompressor to finish the block before the empty fixed |
300 | codes block. |
301 | |
302 | If flush is set to Z_BLOCK, a deflate block is completed and emitted, as |
303 | for Z_SYNC_FLUSH, but the output is not aligned on a byte boundary, and up to |
304 | seven bits of the current block are held to be written as the next byte after |
305 | the next deflate block is completed. In this case, the decompressor may not |
306 | be provided enough bits at this point in order to complete decompression of |
307 | the data provided so far to the compressor. It may need to wait for the next |
308 | block to be emitted. This is for advanced applications that need to control |
309 | the emission of deflate blocks. |
310 | |
311 | If flush is set to Z_FULL_FLUSH, all output is flushed as with |
312 | Z_SYNC_FLUSH, and the compression state is reset so that decompression can |
313 | restart from this point if previous compressed data has been damaged or if |
314 | random access is desired. Using Z_FULL_FLUSH too often can seriously degrade |
315 | compression. |
316 | |
317 | If deflate returns with avail_out == 0, this function must be called again |
318 | with the same value of the flush parameter and more output space (updated |
319 | avail_out), until the flush is complete (deflate returns with non-zero |
320 | avail_out). In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that |
321 | avail_out is greater than six to avoid repeated flush markers due to |
322 | avail_out == 0 on return. |
323 | |
324 | If the parameter flush is set to Z_FINISH, pending input is processed, |
325 | pending output is flushed and deflate returns with Z_STREAM_END if there was |
326 | enough output space. If deflate returns with Z_OK or Z_BUF_ERROR, this |
327 | function must be called again with Z_FINISH and more output space (updated |
328 | avail_out) but no more input data, until it returns with Z_STREAM_END or an |
329 | error. After deflate has returned Z_STREAM_END, the only possible operations |
330 | on the stream are deflateReset or deflateEnd. |
331 | |
332 | Z_FINISH can be used in the first deflate call after deflateInit if all the |
333 | compression is to be done in a single step. In order to complete in one |
334 | call, avail_out must be at least the value returned by deflateBound (see |
335 | below). Then deflate is guaranteed to return Z_STREAM_END. If not enough |
336 | output space is provided, deflate will not return Z_STREAM_END, and it must |
337 | be called again as described above. |
338 | |
339 | deflate() sets strm->adler to the Adler-32 checksum of all input read |
340 | so far (that is, total_in bytes). If a gzip stream is being generated, then |
341 | strm->adler will be the CRC-32 checksum of the input read so far. (See |
342 | deflateInit2 below.) |
343 | |
344 | deflate() may update strm->data_type if it can make a good guess about |
345 | the input data type (Z_BINARY or Z_TEXT). If in doubt, the data is |
346 | considered binary. This field is only for information purposes and does not |
347 | affect the compression algorithm in any manner. |
348 | |
349 | deflate() returns Z_OK if some progress has been made (more input |
350 | processed or more output produced), Z_STREAM_END if all input has been |
351 | consumed and all output has been produced (only when flush is set to |
352 | Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example |
353 | if next_in or next_out was NULL) or the state was inadvertently written over |
354 | by the application), or Z_BUF_ERROR if no progress is possible (for example |
355 | avail_in or avail_out was zero). Note that Z_BUF_ERROR is not fatal, and |
356 | deflate() can be called again with more input and more output space to |
357 | continue compressing. |
358 | */ |
359 | |
360 | |
361 | ZEXTERN int ZEXPORT deflateEnd(z_stream *strm); |
362 | /* |
363 | All dynamically allocated data structures for this stream are freed. |
364 | This function discards any unprocessed input and does not flush any pending |
365 | output. |
366 | |
367 | deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the |
368 | stream state was inconsistent, Z_DATA_ERROR if the stream was freed |
369 | prematurely (some input or output was discarded). In the error case, msg |
370 | may be set but then points to a static string (which must not be |
371 | deallocated). |
372 | */ |
373 | |
374 | |
375 | /* |
376 | ZEXTERN int ZEXPORT inflateInit (z_stream *strm); |
377 | |
378 | Initializes the internal stream state for decompression. The fields |
379 | next_in, avail_in, zalloc, zfree and opaque must be initialized before by |
380 | the caller. In the current version of inflate, the provided input is not |
381 | read or consumed. The allocation of a sliding window will be deferred to |
382 | the first call of inflate (if the decompression does not complete on the |
383 | first call). If zalloc and zfree are set to NULL, inflateInit updates |
384 | them to use default allocation functions. |
385 | |
386 | inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough |
387 | memory, Z_VERSION_ERROR if the zlib library version is incompatible with the |
388 | version assumed by the caller, or Z_STREAM_ERROR if the parameters are |
389 | invalid, such as a null pointer to the structure. msg is set to null if |
390 | there is no error message. inflateInit does not perform any decompression. |
391 | Actual decompression will be done by inflate(). So next_in, and avail_in, |
392 | next_out, and avail_out are unused and unchanged. The current |
393 | implementation of inflateInit() does not process any header information -- |
394 | that is deferred until inflate() is called. |
395 | */ |
396 | |
397 | |
398 | ZEXTERN int ZEXPORT inflate(z_stream *strm, int flush); |
399 | /* |
400 | inflate decompresses as much data as possible, and stops when the input |
401 | buffer becomes empty or the output buffer becomes full. It may introduce |
402 | some output latency (reading input without producing any output) except when |
403 | forced to flush. |
404 | |
405 | The detailed semantics are as follows. inflate performs one or both of the |
406 | following actions: |
407 | |
408 | - Decompress more input starting at next_in and update next_in and avail_in |
409 | accordingly. If not all input can be processed (because there is not |
410 | enough room in the output buffer), then next_in and avail_in are updated |
411 | accordingly, and processing will resume at this point for the next call of |
412 | inflate(). |
413 | |
414 | - Generate more output starting at next_out and update next_out and avail_out |
415 | accordingly. inflate() provides as much output as possible, until there is |
416 | no more input data or no more space in the output buffer (see below about |
417 | the flush parameter). |
418 | |
419 | Before the call of inflate(), the application should ensure that at least |
420 | one of the actions is possible, by providing more input and/or consuming more |
421 | output, and updating the next_* and avail_* values accordingly. If the |
422 | caller of inflate() does not provide both available input and available |
423 | output space, it is possible that there will be no progress made. The |
424 | application can consume the uncompressed output when it wants, for example |
425 | when the output buffer is full (avail_out == 0), or after each call of |
426 | inflate(). If inflate returns Z_OK and with zero avail_out, it must be |
427 | called again after making room in the output buffer because there might be |
428 | more output pending. |
429 | |
430 | The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH, Z_FINISH, |
431 | Z_BLOCK, or Z_TREES. Z_SYNC_FLUSH requests that inflate() flush as much |
432 | output as possible to the output buffer. Z_BLOCK requests that inflate() |
433 | stop if and when it gets to the next deflate block boundary. When decoding |
434 | the zlib or gzip format, this will cause inflate() to return immediately |
435 | after the header and before the first block. When doing a raw inflate, |
436 | inflate() will go ahead and process the first block, and will return when it |
437 | gets to the end of that block, or when it runs out of data. |
438 | |
439 | The Z_BLOCK option assists in appending to or combining deflate streams. |
440 | To assist in this, on return inflate() always sets strm->data_type to the |
441 | number of unused bits in the last byte taken from strm->next_in, plus 64 if |
442 | inflate() is currently decoding the last block in the deflate stream, plus |
443 | 128 if inflate() returned immediately after decoding an end-of-block code or |
444 | decoding the complete header up to just before the first byte of the deflate |
445 | stream. The end-of-block will not be indicated until all of the uncompressed |
446 | data from that block has been written to strm->next_out. The number of |
447 | unused bits may in general be greater than seven, except when bit 7 of |
448 | data_type is set, in which case the number of unused bits will be less than |
449 | eight. data_type is set as noted here every time inflate() returns for all |
450 | flush options, and so can be used to determine the amount of currently |
451 | consumed input in bits. |
452 | |
453 | The Z_TREES option behaves as Z_BLOCK does, but it also returns when the |
454 | end of each deflate block header is reached, before any actual data in that |
455 | block is decoded. This allows the caller to determine the length of the |
456 | deflate block header for later use in random access within a deflate block. |
457 | 256 is added to the value of strm->data_type when inflate() returns |
458 | immediately after reaching the end of the deflate block header. |
459 | |
460 | inflate() should normally be called until it returns Z_STREAM_END or an |
461 | error. However if all decompression is to be performed in a single step (a |
462 | single call of inflate), the parameter flush should be set to Z_FINISH. In |
463 | this case all pending input is processed and all pending output is flushed; |
464 | avail_out must be large enough to hold all of the uncompressed data for the |
465 | operation to complete. (The size of the uncompressed data may have been |
466 | saved by the compressor for this purpose.) The use of Z_FINISH is not |
467 | required to perform an inflation in one step. However it may be used to |
468 | inform inflate that a faster approach can be used for the single inflate() |
469 | call. Z_FINISH also informs inflate to not maintain a sliding window if the |
470 | stream completes, which reduces inflate's memory footprint. If the stream |
471 | does not complete, either because not all of the stream is provided or not |
472 | enough output space is provided, then a sliding window will be allocated and |
473 | inflate() can be called again to continue the operation as if Z_NO_FLUSH had |
474 | been used. |
475 | |
476 | In this implementation, inflate() always flushes as much output as |
477 | possible to the output buffer, and always uses the faster approach on the |
478 | first call. So the effects of the flush parameter in this implementation are |
479 | on the return value of inflate() as noted below, when inflate() returns early |
480 | when Z_BLOCK or Z_TREES is used, and when inflate() avoids the allocation of |
481 | memory for a sliding window when Z_FINISH is used. |
482 | |
483 | If a preset dictionary is needed after this call (see inflateSetDictionary |
484 | below), inflate sets strm->adler to the Adler-32 checksum of the dictionary |
485 | chosen by the compressor and returns Z_NEED_DICT; otherwise it sets |
486 | strm->adler to the Adler-32 checksum of all output produced so far (that is, |
487 | total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described |
488 | below. At the end of the stream, inflate() checks that its computed Adler-32 |
489 | checksum is equal to that saved by the compressor and returns Z_STREAM_END |
490 | only if the checksum is correct. |
491 | |
492 | inflate() can decompress and check either zlib-wrapped or gzip-wrapped |
493 | deflate data. The header type is detected automatically, if requested when |
494 | initializing with inflateInit2(). Any information contained in the gzip |
495 | header is not retained unless inflateGetHeader() is used. When processing |
496 | gzip-wrapped deflate data, strm->adler32 is set to the CRC-32 of the output |
497 | produced so far. The CRC-32 is checked against the gzip trailer, as is the |
498 | uncompressed length, modulo 2^32. |
499 | |
500 | inflate() returns Z_OK if some progress has been made (more input processed |
501 | or more output produced), Z_STREAM_END if the end of the compressed data has |
502 | been reached and all uncompressed output has been produced, Z_NEED_DICT if a |
503 | preset dictionary is needed at this point, Z_DATA_ERROR if the input data was |
504 | corrupted (input stream not conforming to the zlib format or incorrect check |
505 | value, in which case strm->msg points to a string with a more specific |
506 | error), Z_STREAM_ERROR if the stream structure was inconsistent (for example |
507 | next_in or next_out was NULL, or the state was inadvertently written over |
508 | by the application), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR |
509 | if no progress is possible or if there was not enough room in the output |
510 | buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and |
511 | inflate() can be called again with more input and more output space to |
512 | continue decompressing. If Z_DATA_ERROR is returned, the application may |
513 | then call inflateSync() to look for a good compression block if a partial |
514 | recovery of the data is to be attempted. |
515 | */ |
516 | |
517 | |
518 | ZEXTERN int ZEXPORT inflateEnd(z_stream *strm); |
519 | /* |
520 | All dynamically allocated data structures for this stream are freed. |
521 | This function discards any unprocessed input and does not flush any pending |
522 | output. |
523 | |
524 | inflateEnd returns Z_OK if success, or Z_STREAM_ERROR if the stream state |
525 | was inconsistent. |
526 | */ |
527 | |
528 | |
529 | /* Advanced functions */ |
530 | |
531 | /* |
532 | The following functions are needed only in some special applications. |
533 | */ |
534 | |
535 | /* |
536 | ZEXTERN int ZEXPORT deflateInit2 (z_stream *strm, |
537 | int level, |
538 | int method, |
539 | int windowBits, |
540 | int memLevel, |
541 | int strategy); |
542 | |
543 | This is another version of deflateInit with more compression options. The |
544 | fields zalloc, zfree and opaque must be initialized before by the caller. |
545 | |
546 | The method parameter is the compression method. It must be Z_DEFLATED in |
547 | this version of the library. |
548 | |
549 | The windowBits parameter is the base two logarithm of the window size |
550 | (the size of the history buffer). It should be in the range 8..15 for this |
551 | version of the library. Larger values of this parameter result in better |
552 | compression at the expense of memory usage. The default value is 15 if |
553 | deflateInit is used instead. |
554 | |
555 | For the current implementation of deflate(), a windowBits value of 8 (a |
556 | window size of 256 bytes) is not supported. As a result, a request for 8 |
557 | will result in 9 (a 512-byte window). In that case, providing 8 to |
558 | inflateInit2() will result in an error when the zlib header with 9 is |
559 | checked against the initialization of inflate(). The remedy is to not use 8 |
560 | with deflateInit2() with this initialization, or at least in that case use 9 |
561 | with inflateInit2(). |
562 | |
563 | windowBits can also be -8..-15 for raw deflate. In this case, -windowBits |
564 | determines the window size. deflate() will then generate raw deflate data |
565 | with no zlib header or trailer, and will not compute a check value. |
566 | |
567 | windowBits can also be greater than 15 for optional gzip encoding. Add |
568 | 16 to windowBits to write a simple gzip header and trailer around the |
569 | compressed data instead of a zlib wrapper. The gzip header will have no |
570 | file name, no extra data, no comment, no modification time (set to zero), no |
571 | header crc, and the operating system will be set to the appropriate value, |
572 | if the operating system was determined at compile time. If a gzip stream is |
573 | being written, strm->adler is a CRC-32 instead of an Adler-32. |
574 | |
575 | For raw deflate or gzip encoding, a request for a 256-byte window is |
576 | rejected as invalid, since only the zlib header provides a means of |
577 | transmitting the window size to the decompressor. |
578 | |
579 | The memLevel parameter specifies how much memory should be allocated |
580 | for the internal compression state. memLevel=1 uses minimum memory but is |
581 | slow and reduces compression ratio; memLevel=9 uses maximum memory for |
582 | optimal speed. The default value is 8. See zconf.h for total memory usage |
583 | as a function of windowBits and memLevel. |
584 | |
585 | The strategy parameter is used to tune the compression algorithm. Use the |
586 | value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a |
587 | filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no |
588 | string match), or Z_RLE to limit match distances to one (run-length |
589 | encoding). Filtered data consists mostly of small values with a somewhat |
590 | random distribution. In this case, the compression algorithm is tuned to |
591 | compress them better. The effect of Z_FILTERED is to force more Huffman |
592 | coding and less string matching; it is somewhat intermediate between |
593 | Z_DEFAULT_STRATEGY and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as |
594 | fast as Z_HUFFMAN_ONLY, but give better compression for PNG image data. The |
595 | strategy parameter only affects the compression ratio but not the |
596 | correctness of the compressed output even if it is not set appropriately. |
597 | Z_FIXED prevents the use of dynamic Huffman codes, allowing for a simpler |
598 | decoder for special applications. |
599 | |
600 | deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
601 | memory, Z_STREAM_ERROR if any parameter is invalid (such as an invalid |
602 | method), or Z_VERSION_ERROR if the zlib library version (zlib_version) is |
603 | incompatible with the version assumed by the caller (ZLIB_VERSION). msg is |
604 | set to null if there is no error message. deflateInit2 does not perform any |
605 | compression: this will be done by deflate(). |
606 | */ |
607 | |
608 | ZEXTERN int ZEXPORT deflateSetDictionary(z_stream *strm, |
609 | const unsigned char *dictionary, |
610 | unsigned int dictLength); |
611 | /* |
612 | Initializes the compression dictionary from the given byte sequence |
613 | without producing any compressed output. When using the zlib format, this |
614 | function must be called immediately after deflateInit, deflateInit2 or |
615 | deflateReset, and before any call of deflate. When doing raw deflate, this |
616 | function must be called either before any call of deflate, or immediately |
617 | after the completion of a deflate block, i.e. after all input has been |
618 | consumed and all output has been delivered when using any of the flush |
619 | options Z_BLOCK, Z_PARTIAL_FLUSH, Z_SYNC_FLUSH, or Z_FULL_FLUSH. The |
620 | compressor and decompressor must use exactly the same dictionary (see |
621 | inflateSetDictionary). |
622 | |
623 | The dictionary should consist of strings (byte sequences) that are likely |
624 | to be encountered later in the data to be compressed, with the most commonly |
625 | used strings preferably put towards the end of the dictionary. Using a |
626 | dictionary is most useful when the data to be compressed is short and can be |
627 | predicted with good accuracy; the data can then be compressed better than |
628 | with the default empty dictionary. |
629 | |
630 | Depending on the size of the compression data structures selected by |
631 | deflateInit or deflateInit2, a part of the dictionary may in effect be |
632 | discarded, for example if the dictionary is larger than the window size |
633 | provided in deflateInit or deflateInit2. Thus the strings most likely to be |
634 | useful should be put at the end of the dictionary, not at the front. In |
635 | addition, the current implementation of deflate will use at most the window |
636 | size minus 262 bytes of the provided dictionary. |
637 | |
638 | Upon return of this function, strm->adler is set to the Adler-32 value |
639 | of the dictionary; the decompressor may later use this value to determine |
640 | which dictionary has been used by the compressor. (The Adler-32 value |
641 | applies to the whole dictionary even if only a subset of the dictionary is |
642 | actually used by the compressor.) If a raw deflate was requested, then the |
643 | Adler-32 value is not computed and strm->adler is not set. |
644 | |
645 | deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a |
646 | parameter is invalid (e.g. dictionary being NULL) or the stream state is |
647 | inconsistent (for example if deflate has already been called for this stream |
648 | or if not at a block boundary for raw deflate). deflateSetDictionary does |
649 | not perform any compression: this will be done by deflate(). |
650 | */ |
651 | |
652 | ZEXTERN int ZEXPORT deflateGetDictionary (z_stream *strm, unsigned char *dictionary, unsigned int *dictLength); |
653 | /* |
654 | Returns the sliding dictionary being maintained by deflate. dictLength is |
655 | set to the number of bytes in the dictionary, and that many bytes are copied |
656 | to dictionary. dictionary must have enough space, where 32768 bytes is |
657 | always enough. If deflateGetDictionary() is called with dictionary equal to |
658 | Z_NULL, then only the dictionary length is returned, and nothing is copied. |
659 | Similary, if dictLength is Z_NULL, then it is not set. |
660 | |
661 | deflateGetDictionary() may return a length less than the window size, even |
662 | when more than the window size in input has been provided. It may return up |
663 | to 258 bytes less in that case, due to how zlib's implementation of deflate |
664 | manages the sliding window and lookahead for matches, where matches can be |
665 | up to 258 bytes long. If the application needs the last window-size bytes of |
666 | input, then that would need to be saved by the application outside of zlib. |
667 | |
668 | deflateGetDictionary returns Z_OK on success, or Z_STREAM_ERROR if the |
669 | stream state is inconsistent. |
670 | */ |
671 | |
672 | ZEXTERN int ZEXPORT deflateCopy(z_stream *dest, z_stream *source); |
673 | /* |
674 | Sets the destination stream as a complete copy of the source stream. |
675 | |
676 | This function can be useful when several compression strategies will be |
677 | tried, for example when there are several ways of pre-processing the input |
678 | data with a filter. The streams that will be discarded should then be freed |
679 | by calling deflateEnd. Note that deflateCopy duplicates the internal |
680 | compression state which can be quite large, so this strategy is slow and can |
681 | consume lots of memory. |
682 | |
683 | deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not |
684 | enough memory, Z_STREAM_ERROR if the source stream state was inconsistent |
685 | (such as zalloc being NULL). msg is left unchanged in both source and |
686 | destination. |
687 | */ |
688 | |
689 | ZEXTERN int ZEXPORT deflateReset(z_stream *strm); |
690 | /* |
691 | This function is equivalent to deflateEnd followed by deflateInit, but |
692 | does not free and reallocate the internal compression state. The stream |
693 | will leave the compression level and any other attributes that may have been |
694 | set unchanged. |
695 | |
696 | deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source |
697 | stream state was inconsistent (such as zalloc or state being NULL). |
698 | */ |
699 | |
700 | ZEXTERN int ZEXPORT deflateParams(z_stream *strm, int level, int strategy); |
701 | /* |
702 | Dynamically update the compression level and compression strategy. The |
703 | interpretation of level and strategy is as in deflateInit2(). This can be |
704 | used to switch between compression and straight copy of the input data, or |
705 | to switch to a different kind of input data requiring a different strategy. |
706 | If the compression approach (which is a function of the level) or the |
707 | strategy is changed, and if there have been any deflate() calls since the |
708 | state was initialized or reset, then the input available so far is |
709 | compressed with the old level and strategy using deflate(strm, Z_BLOCK). |
710 | There are three approaches for the compression levels 0, 1..3, and 4..9 |
711 | respectively. The new level and strategy will take effect at the next call |
712 | of deflate(). |
713 | |
714 | If a deflate(strm, Z_BLOCK) is performed by deflateParams(), and it does |
715 | not have enough output space to complete, then the parameter change will not |
716 | take effect. In this case, deflateParams() can be called again with the |
717 | same parameters and more output space to try again. |
718 | |
719 | In order to assure a change in the parameters on the first try, the |
720 | deflate stream should be flushed using deflate() with Z_BLOCK or other flush |
721 | request until strm.avail_out is not zero, before calling deflateParams(). |
722 | Then no more input data should be provided before the deflateParams() call. |
723 | If this is done, the old level and strategy will be applied to the data |
724 | compressed before deflateParams(), and the new level and strategy will be |
725 | applied to the the data compressed after deflateParams(). |
726 | |
727 | deflateParams returns Z_OK on success, Z_STREAM_ERROR if the source stream |
728 | state was inconsistent or if a parameter was invalid, or Z_BUF_ERROR if |
729 | there was not enough output space to complete the compression of the |
730 | available input data before a change in the strategy or approach. Note that |
731 | in the case of a Z_BUF_ERROR, the parameters are not changed. A return |
732 | value of Z_BUF_ERROR is not fatal, in which case deflateParams() can be |
733 | retried with more output space. |
734 | */ |
735 | |
736 | ZEXTERN int ZEXPORT deflateTune(z_stream *strm, int good_length, int max_lazy, int nice_length, int max_chain); |
737 | /* |
738 | Fine tune deflate's internal compression parameters. This should only be |
739 | used by someone who understands the algorithm used by zlib's deflate for |
740 | searching for the best matching string, and even then only by the most |
741 | fanatic optimizer trying to squeeze out the last compressed bit for their |
742 | specific input data. Read the deflate.c source code for the meaning of the |
743 | max_lazy, good_length, nice_length, and max_chain parameters. |
744 | |
745 | deflateTune() can be called after deflateInit() or deflateInit2(), and |
746 | returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream. |
747 | */ |
748 | |
749 | ZEXTERN unsigned long ZEXPORT deflateBound(z_stream *strm, unsigned long sourceLen); |
750 | /* |
751 | deflateBound() returns an upper bound on the compressed size after |
752 | deflation of sourceLen bytes. It must be called after deflateInit() or |
753 | deflateInit2(), and after deflateSetHeader(), if used. This would be used |
754 | to allocate an output buffer for deflation in a single pass, and so would be |
755 | called before deflate(). If that first deflate() call is provided the |
756 | sourceLen input bytes, an output buffer allocated to the size returned by |
757 | deflateBound(), and the flush value Z_FINISH, then deflate() is guaranteed |
758 | to return Z_STREAM_END. Note that it is possible for the compressed size to |
759 | be larger than the value returned by deflateBound() if flush options other |
760 | than Z_FINISH or Z_NO_FLUSH are used. |
761 | */ |
762 | |
763 | ZEXTERN int ZEXPORT deflatePending(z_stream *strm, uint32_t *pending, int *bits); |
764 | /* |
765 | deflatePending() returns the number of bytes and bits of output that have |
766 | been generated, but not yet provided in the available output. The bytes not |
767 | provided would be due to the available output space having being consumed. |
768 | The number of bits of output not provided are between 0 and 7, where they |
769 | await more bits to join them in order to fill out a full byte. If pending |
770 | or bits are NULL, then those values are not set. |
771 | |
772 | deflatePending returns Z_OK if success, or Z_STREAM_ERROR if the source |
773 | stream state was inconsistent. |
774 | */ |
775 | |
776 | ZEXTERN int ZEXPORT deflatePrime(z_stream *strm, int bits, int value); |
777 | /* |
778 | deflatePrime() inserts bits in the deflate output stream. The intent |
779 | is that this function is used to start off the deflate output with the bits |
780 | leftover from a previous deflate stream when appending to it. As such, this |
781 | function can only be used for raw deflate, and must be used before the first |
782 | deflate() call after a deflateInit2() or deflateReset(). bits must be less |
783 | than or equal to 16, and that many of the least significant bits of value |
784 | will be inserted in the output. |
785 | |
786 | deflatePrime returns Z_OK if success, Z_BUF_ERROR if there was not enough |
787 | room in the internal buffer to insert the bits, or Z_STREAM_ERROR if the |
788 | source stream state was inconsistent. |
789 | */ |
790 | |
791 | ZEXTERN int ZEXPORT (z_stream *strm, gz_headerp head); |
792 | /* |
793 | deflateSetHeader() provides gzip header information for when a gzip |
794 | stream is requested by deflateInit2(). deflateSetHeader() may be called |
795 | after deflateInit2() or deflateReset() and before the first call of |
796 | deflate(). The text, time, os, extra field, name, and comment information |
797 | in the provided gz_header structure are written to the gzip header (xflag is |
798 | ignored -- the extra flags are set according to the compression level). The |
799 | caller must assure that, if not NULL, name and comment are terminated with |
800 | a zero byte, and that if extra is not NULL, that extra_len bytes are |
801 | available there. If hcrc is true, a gzip header crc is included. Note that |
802 | the current versions of the command-line version of gzip (up through version |
803 | 1.3.x) do not support header crc's, and will report that it is a "multi-part |
804 | gzip file" and give up. |
805 | |
806 | If deflateSetHeader is not used, the default gzip header has text false, |
807 | the time set to zero, and os set to 255, with no extra, name, or comment |
808 | fields. The gzip header is returned to the default state by deflateReset(). |
809 | |
810 | deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source |
811 | stream state was inconsistent. |
812 | */ |
813 | |
814 | /* |
815 | ZEXTERN int ZEXPORT inflateInit2(z_stream *strm, int windowBits); |
816 | |
817 | This is another version of inflateInit with an extra parameter. The |
818 | fields next_in, avail_in, zalloc, zfree and opaque must be initialized |
819 | before by the caller. |
820 | |
821 | The windowBits parameter is the base two logarithm of the maximum window |
822 | size (the size of the history buffer). It should be in the range 8..15 for |
823 | this version of the library. The default value is 15 if inflateInit is used |
824 | instead. windowBits must be greater than or equal to the windowBits value |
825 | provided to deflateInit2() while compressing, or it must be equal to 15 if |
826 | deflateInit2() was not used. If a compressed stream with a larger window |
827 | size is given as input, inflate() will return with the error code |
828 | Z_DATA_ERROR instead of trying to allocate a larger window. |
829 | |
830 | windowBits can also be zero to request that inflate use the window size in |
831 | the zlib header of the compressed stream. |
832 | |
833 | windowBits can also be -8..-15 for raw inflate. In this case, -windowBits |
834 | determines the window size. inflate() will then process raw deflate data, |
835 | not looking for a zlib or gzip header, not generating a check value, and not |
836 | looking for any check values for comparison at the end of the stream. This |
837 | is for use with other formats that use the deflate compressed data format |
838 | such as zip. Those formats provide their own check values. If a custom |
839 | format is developed using the raw deflate format for compressed data, it is |
840 | recommended that a check value such as an Adler-32 or a CRC-32 be applied to |
841 | the uncompressed data as is done in the zlib, gzip, and zip formats. For |
842 | most applications, the zlib format should be used as is. Note that comments |
843 | above on the use in deflateInit2() applies to the magnitude of windowBits. |
844 | |
845 | windowBits can also be greater than 15 for optional gzip decoding. Add |
846 | 32 to windowBits to enable zlib and gzip decoding with automatic header |
847 | detection, or add 16 to decode only the gzip format (the zlib format will |
848 | return a Z_DATA_ERROR). If a gzip stream is being decoded, strm->adler is a |
849 | CRC-32 instead of an Adler-32. Unlike the gunzip utility and gzread() (see |
850 | below), inflate() will *not* automatically decode concatenated gzip members. |
851 | inflate() will return Z_STREAM_END at the end of the gzip member. The state |
852 | would need to be reset to continue decoding a subsequent gzip member. This |
853 | *must* be done if there is more data after a gzip member, in order for the |
854 | decompression to be compliant with the gzip standard (RFC 1952). |
855 | |
856 | inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
857 | memory, Z_VERSION_ERROR if the zlib library version is incompatible with the |
858 | version assumed by the caller, or Z_STREAM_ERROR if the parameters are |
859 | invalid, such as a null pointer to the structure. msg is set to null if |
860 | there is no error message. inflateInit2 does not perform any decompression |
861 | apart from possibly reading the zlib header if present: actual decompression |
862 | will be done by inflate(). (So next_in and avail_in may be modified, but |
863 | next_out and avail_out are unused and unchanged.) The current implementation |
864 | of inflateInit2() does not process any header information -- that is |
865 | deferred until inflate() is called. |
866 | */ |
867 | |
868 | ZEXTERN int ZEXPORT inflateSetDictionary(z_stream *strm, const unsigned char *dictionary, unsigned int dictLength); |
869 | /* |
870 | Initializes the decompression dictionary from the given uncompressed byte |
871 | sequence. This function must be called immediately after a call of inflate, |
872 | if that call returned Z_NEED_DICT. The dictionary chosen by the compressor |
873 | can be determined from the Adler-32 value returned by that call of inflate. |
874 | The compressor and decompressor must use exactly the same dictionary (see |
875 | deflateSetDictionary). For raw inflate, this function can be called at any |
876 | time to set the dictionary. If the provided dictionary is smaller than the |
877 | window and there is already data in the window, then the provided dictionary |
878 | will amend what's there. The application must insure that the dictionary |
879 | that was used for compression is provided. |
880 | |
881 | inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a |
882 | parameter is invalid (e.g. dictionary being NULL) or the stream state is |
883 | inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the |
884 | expected one (incorrect Adler-32 value). inflateSetDictionary does not |
885 | perform any decompression: this will be done by subsequent calls of |
886 | inflate(). |
887 | */ |
888 | |
889 | ZEXTERN int ZEXPORT inflateGetDictionary(z_stream *strm, unsigned char *dictionary, unsigned int *dictLength); |
890 | /* |
891 | Returns the sliding dictionary being maintained by inflate. dictLength is |
892 | set to the number of bytes in the dictionary, and that many bytes are copied |
893 | to dictionary. dictionary must have enough space, where 32768 bytes is |
894 | always enough. If inflateGetDictionary() is called with dictionary equal to |
895 | NULL, then only the dictionary length is returned, and nothing is copied. |
896 | Similary, if dictLength is NULL, then it is not set. |
897 | |
898 | inflateGetDictionary returns Z_OK on success, or Z_STREAM_ERROR if the |
899 | stream state is inconsistent. |
900 | */ |
901 | |
902 | ZEXTERN int ZEXPORT inflateSync(z_stream *strm); |
903 | /* |
904 | Skips invalid compressed data until a possible full flush point (see above |
905 | for the description of deflate with Z_FULL_FLUSH) can be found, or until all |
906 | available input is skipped. No output is provided. |
907 | |
908 | inflateSync searches for a 00 00 FF FF pattern in the compressed data. |
909 | All full flush points have this pattern, but not all occurrences of this |
910 | pattern are full flush points. |
911 | |
912 | inflateSync returns Z_OK if a possible full flush point has been found, |
913 | Z_BUF_ERROR if no more input was provided, Z_DATA_ERROR if no flush point |
914 | has been found, or Z_STREAM_ERROR if the stream structure was inconsistent. |
915 | In the success case, the application may save the current current value of |
916 | total_in which indicates where valid compressed data was found. In the |
917 | error case, the application may repeatedly call inflateSync, providing more |
918 | input each time, until success or end of the input data. |
919 | */ |
920 | |
921 | ZEXTERN int ZEXPORT inflateCopy(z_stream *dest, z_stream *source); |
922 | /* |
923 | Sets the destination stream as a complete copy of the source stream. |
924 | |
925 | This function can be useful when randomly accessing a large stream. The |
926 | first pass through the stream can periodically record the inflate state, |
927 | allowing restarting inflate at those points when randomly accessing the |
928 | stream. |
929 | |
930 | inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not |
931 | enough memory, Z_STREAM_ERROR if the source stream state was inconsistent |
932 | (such as zalloc being NULL). msg is left unchanged in both source and |
933 | destination. |
934 | */ |
935 | |
936 | ZEXTERN int ZEXPORT inflateReset(z_stream *strm); |
937 | /* |
938 | This function is equivalent to inflateEnd followed by inflateInit, |
939 | but does not free and reallocate the internal decompression state. The |
940 | stream will keep attributes that may have been set by inflateInit2. |
941 | |
942 | inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source |
943 | stream state was inconsistent (such as zalloc or state being NULL). |
944 | */ |
945 | |
946 | ZEXTERN int ZEXPORT inflateReset2(z_stream *strm, int windowBits); |
947 | /* |
948 | This function is the same as inflateReset, but it also permits changing |
949 | the wrap and window size requests. The windowBits parameter is interpreted |
950 | the same as it is for inflateInit2. If the window size is changed, then the |
951 | memory allocated for the window is freed, and the window will be reallocated |
952 | by inflate() if needed. |
953 | |
954 | inflateReset2 returns Z_OK if success, or Z_STREAM_ERROR if the source |
955 | stream state was inconsistent (such as zalloc or state being NULL), or if |
956 | the windowBits parameter is invalid. |
957 | */ |
958 | |
959 | ZEXTERN int ZEXPORT inflatePrime(z_stream *strm, int bits, int value); |
960 | /* |
961 | This function inserts bits in the inflate input stream. The intent is |
962 | that this function is used to start inflating at a bit position in the |
963 | middle of a byte. The provided bits will be used before any bytes are used |
964 | from next_in. This function should only be used with raw inflate, and |
965 | should be used before the first inflate() call after inflateInit2() or |
966 | inflateReset(). bits must be less than or equal to 16, and that many of the |
967 | least significant bits of value will be inserted in the input. |
968 | |
969 | If bits is negative, then the input stream bit buffer is emptied. Then |
970 | inflatePrime() can be called again to put bits in the buffer. This is used |
971 | to clear out bits leftover after feeding inflate a block description prior |
972 | to feeding inflate codes. |
973 | |
974 | inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source |
975 | stream state was inconsistent. |
976 | */ |
977 | |
978 | ZEXTERN long ZEXPORT inflateMark(z_stream *strm); |
979 | /* |
980 | This function returns two values, one in the lower 16 bits of the return |
981 | value, and the other in the remaining upper bits, obtained by shifting the |
982 | return value down 16 bits. If the upper value is -1 and the lower value is |
983 | zero, then inflate() is currently decoding information outside of a block. |
984 | If the upper value is -1 and the lower value is non-zero, then inflate is in |
985 | the middle of a stored block, with the lower value equaling the number of |
986 | bytes from the input remaining to copy. If the upper value is not -1, then |
987 | it is the number of bits back from the current bit position in the input of |
988 | the code (literal or length/distance pair) currently being processed. In |
989 | that case the lower value is the number of bytes already emitted for that |
990 | code. |
991 | |
992 | A code is being processed if inflate is waiting for more input to complete |
993 | decoding of the code, or if it has completed decoding but is waiting for |
994 | more output space to write the literal or match data. |
995 | |
996 | inflateMark() is used to mark locations in the input data for random |
997 | access, which may be at bit positions, and to note those cases where the |
998 | output of a code may span boundaries of random access blocks. The current |
999 | location in the input stream can be determined from avail_in and data_type |
1000 | as noted in the description for the Z_BLOCK flush parameter for inflate. |
1001 | |
1002 | inflateMark returns the value noted above, or -65536 if the provided |
1003 | source stream state was inconsistent. |
1004 | */ |
1005 | |
1006 | ZEXTERN int ZEXPORT (z_stream *strm, gz_headerp head); |
1007 | /* |
1008 | inflateGetHeader() requests that gzip header information be stored in the |
1009 | provided gz_header structure. inflateGetHeader() may be called after |
1010 | inflateInit2() or inflateReset(), and before the first call of inflate(). |
1011 | As inflate() processes the gzip stream, head->done is zero until the header |
1012 | is completed, at which time head->done is set to one. If a zlib stream is |
1013 | being decoded, then head->done is set to -1 to indicate that there will be |
1014 | no gzip header information forthcoming. Note that Z_BLOCK or Z_TREES can be |
1015 | used to force inflate() to return immediately after header processing is |
1016 | complete and before any actual data is decompressed. |
1017 | |
1018 | The text, time, xflags, and os fields are filled in with the gzip header |
1019 | contents. hcrc is set to true if there is a header CRC. (The header CRC |
1020 | was valid if done is set to one.) If extra is not NULL, then extra_max |
1021 | contains the maximum number of bytes to write to extra. Once done is true, |
1022 | extra_len contains the actual extra field length, and extra contains the |
1023 | extra field, or that field truncated if extra_max is less than extra_len. |
1024 | If name is not NULL, then up to name_max characters are written there, |
1025 | terminated with a zero unless the length is greater than name_max. If |
1026 | comment is not NULL, then up to comm_max characters are written there, |
1027 | terminated with a zero unless the length is greater than comm_max. When any |
1028 | of extra, name, or comment are not NULL and the respective field is not |
1029 | present in the header, then that field is set to NULL to signal its |
1030 | absence. This allows the use of deflateSetHeader() with the returned |
1031 | structure to duplicate the header. However if those fields are set to |
1032 | allocated memory, then the application will need to save those pointers |
1033 | elsewhere so that they can be eventually freed. |
1034 | |
1035 | If inflateGetHeader is not used, then the header information is simply |
1036 | discarded. The header is always checked for validity, including the header |
1037 | CRC if present. inflateReset() will reset the process to discard the header |
1038 | information. The application would need to call inflateGetHeader() again to |
1039 | retrieve the header from the next gzip stream. |
1040 | |
1041 | inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source |
1042 | stream state was inconsistent. |
1043 | */ |
1044 | |
1045 | /* |
1046 | ZEXTERN int ZEXPORT inflateBackInit (z_stream *strm, int windowBits, unsigned char *window); |
1047 | |
1048 | Initialize the internal stream state for decompression using inflateBack() |
1049 | calls. The fields zalloc, zfree and opaque in strm must be initialized |
1050 | before the call. If zalloc and zfree are NULL, then the default library- |
1051 | derived memory allocation routines are used. windowBits is the base two |
1052 | logarithm of the window size, in the range 8..15. window is a caller |
1053 | supplied buffer of that size. Except for special applications where it is |
1054 | assured that deflate was used with small window sizes, windowBits must be 15 |
1055 | and a 32K byte window must be supplied to be able to decompress general |
1056 | deflate streams. |
1057 | |
1058 | See inflateBack() for the usage of these routines. |
1059 | |
1060 | inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of |
1061 | the parameters are invalid, Z_MEM_ERROR if the internal state could not be |
1062 | allocated, or Z_VERSION_ERROR if the version of the library does not match |
1063 | the version of the header file. |
1064 | */ |
1065 | |
1066 | typedef uint32_t (*in_func) (void *, const unsigned char * *); |
1067 | typedef int (*out_func) (void *, unsigned char *, uint32_t); |
1068 | |
1069 | ZEXTERN int ZEXPORT inflateBack(z_stream *strm, in_func in, void *in_desc, out_func out, void *out_desc); |
1070 | /* |
1071 | inflateBack() does a raw inflate with a single call using a call-back |
1072 | interface for input and output. This is potentially more efficient than |
1073 | inflate() for file i/o applications, in that it avoids copying between the |
1074 | output and the sliding window by simply making the window itself the output |
1075 | buffer. inflate() can be faster on modern CPUs when used with large |
1076 | buffers. inflateBack() trusts the application to not change the output |
1077 | buffer passed by the output function, at least until inflateBack() returns. |
1078 | |
1079 | inflateBackInit() must be called first to allocate the internal state |
1080 | and to initialize the state with the user-provided window buffer. |
1081 | inflateBack() may then be used multiple times to inflate a complete, raw |
1082 | deflate stream with each call. inflateBackEnd() is then called to free the |
1083 | allocated state. |
1084 | |
1085 | A raw deflate stream is one with no zlib or gzip header or trailer. |
1086 | This routine would normally be used in a utility that reads zip or gzip |
1087 | files and writes out uncompressed files. The utility would decode the |
1088 | header and process the trailer on its own, hence this routine expects only |
1089 | the raw deflate stream to decompress. This is different from the default |
1090 | behavior of inflate(), which expects a zlib header and trailer around the |
1091 | deflate stream. |
1092 | |
1093 | inflateBack() uses two subroutines supplied by the caller that are then |
1094 | called by inflateBack() for input and output. inflateBack() calls those |
1095 | routines until it reads a complete deflate stream and writes out all of the |
1096 | uncompressed data, or until it encounters an error. The function's |
1097 | parameters and return types are defined above in the in_func and out_func |
1098 | typedefs. inflateBack() will call in(in_desc, &buf) which should return the |
1099 | number of bytes of provided input, and a pointer to that input in buf. If |
1100 | there is no input available, in() must return zero -- buf is ignored in that |
1101 | case -- and inflateBack() will return a buffer error. inflateBack() will |
1102 | call out(out_desc, buf, len) to write the uncompressed data buf[0..len-1]. |
1103 | out() should return zero on success, or non-zero on failure. If out() |
1104 | returns non-zero, inflateBack() will return with an error. Neither in() nor |
1105 | out() are permitted to change the contents of the window provided to |
1106 | inflateBackInit(), which is also the buffer that out() uses to write from. |
1107 | The length written by out() will be at most the window size. Any non-zero |
1108 | amount of input may be provided by in(). |
1109 | |
1110 | For convenience, inflateBack() can be provided input on the first call by |
1111 | setting strm->next_in and strm->avail_in. If that input is exhausted, then |
1112 | in() will be called. Therefore strm->next_in must be initialized before |
1113 | calling inflateBack(). If strm->next_in is NULL, then in() will be called |
1114 | immediately for input. If strm->next_in is not NULL, then strm->avail_in |
1115 | must also be initialized, and then if strm->avail_in is not zero, input will |
1116 | initially be taken from strm->next_in[0 .. strm->avail_in - 1]. |
1117 | |
1118 | The in_desc and out_desc parameters of inflateBack() is passed as the |
1119 | first parameter of in() and out() respectively when they are called. These |
1120 | descriptors can be optionally used to pass any information that the caller- |
1121 | supplied in() and out() functions need to do their job. |
1122 | |
1123 | On return, inflateBack() will set strm->next_in and strm->avail_in to |
1124 | pass back any unused input that was provided by the last in() call. The |
1125 | return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR |
1126 | if in() or out() returned an error, Z_DATA_ERROR if there was a format error |
1127 | in the deflate stream (in which case strm->msg is set to indicate the nature |
1128 | of the error), or Z_STREAM_ERROR if the stream was not properly initialized. |
1129 | In the case of Z_BUF_ERROR, an input or output error can be distinguished |
1130 | using strm->next_in which will be NULL only if in() returned an error. If |
1131 | strm->next_in is not NULL, then the Z_BUF_ERROR was due to out() returning |
1132 | non-zero. (in() will always be called before out(), so strm->next_in is |
1133 | assured to be defined if out() returns non-zero.) Note that inflateBack() |
1134 | cannot return Z_OK. |
1135 | */ |
1136 | |
1137 | ZEXTERN int ZEXPORT inflateBackEnd(z_stream *strm); |
1138 | /* |
1139 | All memory allocated by inflateBackInit() is freed. |
1140 | |
1141 | inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream |
1142 | state was inconsistent. |
1143 | */ |
1144 | |
1145 | ZEXTERN unsigned long ZEXPORT zlibCompileFlags(void); |
1146 | /* Return flags indicating compile-time options. |
1147 | |
1148 | Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other: |
1149 | 1.0: size of unsigned int |
1150 | 3.2: size of unsigned long |
1151 | 5.4: size of void * (pointer) |
1152 | 7.6: size of z_off_t |
1153 | |
1154 | Compiler, assembler, and debug options: |
1155 | 8: ZLIB_DEBUG |
1156 | 9: ASMV or ASMINF -- use ASM code |
1157 | 10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention |
1158 | 11: 0 (reserved) |
1159 | |
1160 | One-time table building (smaller code, but not thread-safe if true): |
1161 | 12: BUILDFIXED -- build static block decoding tables when needed (not supported by zlib-ng) |
1162 | 13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed |
1163 | 14,15: 0 (reserved) |
1164 | |
1165 | Library content (indicates missing functionality): |
1166 | 16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking |
1167 | deflate code when not needed) |
1168 | 17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect |
1169 | and decode gzip streams (to avoid linking crc code) |
1170 | 18-19: 0 (reserved) |
1171 | |
1172 | Operation variations (changes in library functionality): |
1173 | 20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate |
1174 | 21: FASTEST -- deflate algorithm with only one, lowest compression level |
1175 | 22,23: 0 (reserved) |
1176 | |
1177 | The sprintf variant used by gzprintf (zero is best): |
1178 | 24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format |
1179 | 25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure! |
1180 | 26: 0 = returns value, 1 = void -- 1 means inferred string length returned |
1181 | |
1182 | Remainder: |
1183 | 27-31: 0 (reserved) |
1184 | */ |
1185 | |
1186 | |
1187 | /* utility functions */ |
1188 | |
1189 | /* |
1190 | The following utility functions are implemented on top of the basic |
1191 | stream-oriented functions. To simplify the interface, some default options |
1192 | are assumed (compression level and memory usage, standard memory allocation |
1193 | functions). The source code of these utility functions can be modified if |
1194 | you need special options. |
1195 | */ |
1196 | |
1197 | ZEXTERN int ZEXPORT compress(unsigned char *dest, unsigned long *destLen, const unsigned char *source, unsigned long sourceLen); |
1198 | /* |
1199 | Compresses the source buffer into the destination buffer. sourceLen is |
1200 | the byte length of the source buffer. Upon entry, destLen is the total size |
1201 | of the destination buffer, which must be at least the value returned by |
1202 | compressBound(sourceLen). Upon exit, destLen is the actual size of the |
1203 | compressed data. compress() is equivalent to compress2() with a level |
1204 | parameter of Z_DEFAULT_COMPRESSION. |
1205 | |
1206 | compress returns Z_OK if success, Z_MEM_ERROR if there was not |
1207 | enough memory, Z_BUF_ERROR if there was not enough room in the output |
1208 | buffer. |
1209 | */ |
1210 | |
1211 | ZEXTERN int ZEXPORT compress2(unsigned char *dest, unsigned long *destLen, const unsigned char *source, |
1212 | unsigned long sourceLen, int level); |
1213 | /* |
1214 | Compresses the source buffer into the destination buffer. The level |
1215 | parameter has the same meaning as in deflateInit. sourceLen is the byte |
1216 | length of the source buffer. Upon entry, destLen is the total size of the |
1217 | destination buffer, which must be at least the value returned by |
1218 | compressBound(sourceLen). Upon exit, destLen is the actual size of the |
1219 | compressed data. |
1220 | |
1221 | compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough |
1222 | memory, Z_BUF_ERROR if there was not enough room in the output buffer, |
1223 | Z_STREAM_ERROR if the level parameter is invalid. |
1224 | */ |
1225 | |
1226 | ZEXTERN unsigned long ZEXPORT compressBound(unsigned long sourceLen); |
1227 | /* |
1228 | compressBound() returns an upper bound on the compressed size after |
1229 | compress() or compress2() on sourceLen bytes. It would be used before a |
1230 | compress() or compress2() call to allocate the destination buffer. |
1231 | */ |
1232 | |
1233 | ZEXTERN int ZEXPORT uncompress(unsigned char *dest, unsigned long *destLen, const unsigned char *source, unsigned long sourceLen); |
1234 | /* |
1235 | Decompresses the source buffer into the destination buffer. sourceLen is |
1236 | the byte length of the source buffer. Upon entry, destLen is the total size |
1237 | of the destination buffer, which must be large enough to hold the entire |
1238 | uncompressed data. (The size of the uncompressed data must have been saved |
1239 | previously by the compressor and transmitted to the decompressor by some |
1240 | mechanism outside the scope of this compression library.) Upon exit, destLen |
1241 | is the actual size of the uncompressed data. |
1242 | |
1243 | uncompress returns Z_OK if success, Z_MEM_ERROR if there was not |
1244 | enough memory, Z_BUF_ERROR if there was not enough room in the output |
1245 | buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete. In |
1246 | the case where there is not enough room, uncompress() will fill the output |
1247 | buffer with the uncompressed data up to that point. |
1248 | */ |
1249 | |
1250 | |
1251 | ZEXTERN int ZEXPORT uncompress2 (unsigned char *dest, unsigned long *destLen, |
1252 | const unsigned char *source, unsigned long *sourceLen); |
1253 | /* |
1254 | Same as uncompress, except that sourceLen is a pointer, where the |
1255 | length of the source is *sourceLen. On return, *sourceLen is the number of |
1256 | source bytes consumed. |
1257 | */ |
1258 | |
1259 | |
1260 | /* gzip file access functions */ |
1261 | |
1262 | /* |
1263 | This library supports reading and writing files in gzip (.gz) format with |
1264 | an interface similar to that of stdio, using the functions that start with |
1265 | "gz". The gzip format is different from the zlib format. gzip is a gzip |
1266 | wrapper, documented in RFC 1952, wrapped around a deflate stream. |
1267 | */ |
1268 | |
1269 | typedef struct gzFile_s *gzFile; /* semi-opaque gzip file descriptor */ |
1270 | |
1271 | /* |
1272 | ZEXTERN gzFile ZEXPORT gzopen(const char *path, const char *mode); |
1273 | |
1274 | Opens a gzip (.gz) file for reading or writing. The mode parameter is as |
1275 | in fopen ("rb" or "wb") but can also include a compression level ("wb9") or |
1276 | a strategy: 'f' for filtered data as in "wb6f", 'h' for Huffman-only |
1277 | compression as in "wb1h", 'R' for run-length encoding as in "wb1R", or 'F' |
1278 | for fixed code compression as in "wb9F". (See the description of |
1279 | deflateInit2 for more information about the strategy parameter.) 'T' will |
1280 | request transparent writing or appending with no compression and not using |
1281 | the gzip format. |
1282 | |
1283 | "a" can be used instead of "w" to request that the gzip stream that will |
1284 | be written be appended to the file. "+" will result in an error, since |
1285 | reading and writing to the same gzip file is not supported. The addition of |
1286 | "x" when writing will create the file exclusively, which fails if the file |
1287 | already exists. On systems that support it, the addition of "e" when |
1288 | reading or writing will set the flag to close the file on an execve() call. |
1289 | |
1290 | These functions, as well as gzip, will read and decode a sequence of gzip |
1291 | streams in a file. The append function of gzopen() can be used to create |
1292 | such a file. (Also see gzflush() for another way to do this.) When |
1293 | appending, gzopen does not test whether the file begins with a gzip stream, |
1294 | nor does it look for the end of the gzip streams to begin appending. gzopen |
1295 | will simply append a gzip stream to the existing file. |
1296 | |
1297 | gzopen can be used to read a file which is not in gzip format; in this |
1298 | case gzread will directly read from the file without decompression. When |
1299 | reading, this will be detected automatically by looking for the magic two- |
1300 | byte gzip header. |
1301 | |
1302 | gzopen returns NULL if the file could not be opened, if there was |
1303 | insufficient memory to allocate the gzFile state, or if an invalid mode was |
1304 | specified (an 'r', 'w', or 'a' was not provided, or '+' was provided). |
1305 | errno can be checked to determine if the reason gzopen failed was that the |
1306 | file could not be opened. |
1307 | */ |
1308 | |
1309 | ZEXTERN gzFile ZEXPORT gzdopen(int fd, const char *mode); |
1310 | /* |
1311 | gzdopen associates a gzFile with the file descriptor fd. File descriptors |
1312 | are obtained from calls like open, dup, creat, pipe or fileno (if the file |
1313 | has been previously opened with fopen). The mode parameter is as in gzopen. |
1314 | |
1315 | The next call of gzclose on the returned gzFile will also close the file |
1316 | descriptor fd, just like fclose(fdopen(fd, mode)) closes the file descriptor |
1317 | fd. If you want to keep fd open, use fd = dup(fd_keep); gz = gzdopen(fd, |
1318 | mode);. The duplicated descriptor should be saved to avoid a leak, since |
1319 | gzdopen does not close fd if it fails. If you are using fileno() to get the |
1320 | file descriptor from a FILE *, then you will have to use dup() to avoid |
1321 | double-close()ing the file descriptor. Both gzclose() and fclose() will |
1322 | close the associated file descriptor, so they need to have different file |
1323 | descriptors. |
1324 | |
1325 | gzdopen returns NULL if there was insufficient memory to allocate the |
1326 | gzFile state, if an invalid mode was specified (an 'r', 'w', or 'a' was not |
1327 | provided, or '+' was provided), or if fd is -1. The file descriptor is not |
1328 | used until the next gz* read, write, seek, or close operation, so gzdopen |
1329 | will not detect if fd is invalid (unless fd is -1). |
1330 | */ |
1331 | |
1332 | ZEXTERN int ZEXPORT gzbuffer(gzFile file, unsigned size); |
1333 | /* |
1334 | Set the internal buffer size used by this library's functions. The |
1335 | default buffer size is 8192 bytes. This function must be called after |
1336 | gzopen() or gzdopen(), and before any other calls that read or write the |
1337 | file. The buffer memory allocation is always deferred to the first read or |
1338 | write. Three times that size in buffer space is allocated. A larger buffer |
1339 | size of, for example, 64K or 128K bytes will noticeably increase the speed |
1340 | of decompression (reading). |
1341 | |
1342 | The new buffer size also affects the maximum length for gzprintf(). |
1343 | |
1344 | gzbuffer() returns 0 on success, or -1 on failure, such as being called |
1345 | too late. |
1346 | */ |
1347 | |
1348 | ZEXTERN int ZEXPORT gzsetparams(gzFile file, int level, int strategy); |
1349 | /* |
1350 | Dynamically update the compression level or strategy. See the description |
1351 | of deflateInit2 for the meaning of these parameters. Previously provided |
1352 | data is flushed before the parameter change. |
1353 | |
1354 | gzsetparams returns Z_OK if success, Z_STREAM_ERROR if the file was not |
1355 | opened for writing, Z_ERRNO if there is an error writing the flushed data, |
1356 | or Z_MEM_ERROR if there is a memory allocation error. |
1357 | */ |
1358 | |
1359 | ZEXTERN int ZEXPORT gzread(gzFile file, void *buf, unsigned len); |
1360 | /* |
1361 | Reads the given number of uncompressed bytes from the compressed file. If |
1362 | the input file is not in gzip format, gzread copies the given number of |
1363 | bytes into the buffer directly from the file. |
1364 | |
1365 | After reaching the end of a gzip stream in the input, gzread will continue |
1366 | to read, looking for another gzip stream. Any number of gzip streams may be |
1367 | concatenated in the input file, and will all be decompressed by gzread(). |
1368 | If something other than a gzip stream is encountered after a gzip stream, |
1369 | that remaining trailing garbage is ignored (and no error is returned). |
1370 | |
1371 | gzread can be used to read a gzip file that is being concurrently written. |
1372 | Upon reaching the end of the input, gzread will return with the available |
1373 | data. If the error code returned by gzerror is Z_OK or Z_BUF_ERROR, then |
1374 | gzclearerr can be used to clear the end of file indicator in order to permit |
1375 | gzread to be tried again. Z_OK indicates that a gzip stream was completed |
1376 | on the last gzread. Z_BUF_ERROR indicates that the input file ended in the |
1377 | middle of a gzip stream. Note that gzread does not return -1 in the event |
1378 | of an incomplete gzip stream. This error is deferred until gzclose(), which |
1379 | will return Z_BUF_ERROR if the last gzread ended in the middle of a gzip |
1380 | stream. Alternatively, gzerror can be used before gzclose to detect this |
1381 | case. |
1382 | |
1383 | gzread returns the number of uncompressed bytes actually read, less than |
1384 | len for end of file, or -1 for error. If len is too large to fit in an int, |
1385 | then nothing is read, -1 is returned, and the error state is set to |
1386 | Z_STREAM_ERROR. |
1387 | */ |
1388 | |
1389 | ZEXTERN size_t ZEXPORT gzfread (void *buf, size_t size, size_t nitems, gzFile file); |
1390 | /* |
1391 | Read up to nitems items of size size from file to buf, otherwise operating |
1392 | as gzread() does. This duplicates the interface of stdio's fread(), with |
1393 | size_t request and return types. |
1394 | |
1395 | gzfread() returns the number of full items read of size size, or zero if |
1396 | the end of the file was reached and a full item could not be read, or if |
1397 | there was an error. gzerror() must be consulted if zero is returned in |
1398 | order to determine if there was an error. If the multiplication of size and |
1399 | nitems overflows, i.e. the product does not fit in a size_t, then nothing |
1400 | is read, zero is returned, and the error state is set to Z_STREAM_ERROR. |
1401 | |
1402 | In the event that the end of file is reached and only a partial item is |
1403 | available at the end, i.e. the remaining uncompressed data length is not a |
1404 | multiple of size, then the final partial item is nevertheless read into buf |
1405 | and the end-of-file flag is set. The length of the partial item read is not |
1406 | provided, but could be inferred from the result of gztell(). This behavior |
1407 | is the same as the behavior of fread() implementations in common libraries, |
1408 | but it prevents the direct use of gzfread() to read a concurrently written |
1409 | file, reseting and retrying on end-of-file, when size is not 1. |
1410 | */ |
1411 | |
1412 | ZEXTERN int ZEXPORT gzwrite(gzFile file, void const *buf, unsigned len); |
1413 | /* |
1414 | Writes the given number of uncompressed bytes into the compressed file. |
1415 | gzwrite returns the number of uncompressed bytes written or 0 in case of |
1416 | error. |
1417 | */ |
1418 | |
1419 | ZEXTERN size_t ZEXPORT gzfwrite(void const *buf, size_t size, size_t nitems, gzFile file); |
1420 | /* |
1421 | gzfwrite() writes nitems items of size size from buf to file, duplicating |
1422 | the interface of stdio's fwrite(), with size_t request and return types. |
1423 | |
1424 | gzfwrite() returns the number of full items written of size size, or zero |
1425 | if there was an error. If the multiplication of size and nitems overflows, |
1426 | i.e. the product does not fit in a size_t, then nothing is written, zero |
1427 | is returned, and the error state is set to Z_STREAM_ERROR. |
1428 | */ |
1429 | |
1430 | ZEXTERN int ZEXPORTVA gzprintf(gzFile file, const char *format, ...); |
1431 | /* |
1432 | Converts, formats, and writes the arguments to the compressed file under |
1433 | control of the format string, as in fprintf. gzprintf returns the number of |
1434 | uncompressed bytes actually written, or a negative zlib error code in case |
1435 | of error. The number of uncompressed bytes written is limited to 8191, or |
1436 | one less than the buffer size given to gzbuffer(). The caller should assure |
1437 | that this limit is not exceeded. If it is exceeded, then gzprintf() will |
1438 | return an error (0) with nothing written. In this case, there may also be a |
1439 | buffer overflow with unpredictable consequences, which is possible only if |
1440 | zlib was compiled with the insecure functions sprintf() or vsprintf() |
1441 | because the secure snprintf() or vsnprintf() functions were not available. |
1442 | This can be determined using zlibCompileFlags(). |
1443 | */ |
1444 | |
1445 | ZEXTERN int ZEXPORT gzputs(gzFile file, const char *s); |
1446 | /* |
1447 | Writes the given null-terminated string to the compressed file, excluding |
1448 | the terminating null character. |
1449 | |
1450 | gzputs returns the number of characters written, or -1 in case of error. |
1451 | */ |
1452 | |
1453 | ZEXTERN char * ZEXPORT gzgets(gzFile file, char *buf, int len); |
1454 | /* |
1455 | Reads bytes from the compressed file until len-1 characters are read, or a |
1456 | newline character is read and transferred to buf, or an end-of-file |
1457 | condition is encountered. If any characters are read or if len == 1, the |
1458 | string is terminated with a null character. If no characters are read due |
1459 | to an end-of-file or len < 1, then the buffer is left untouched. |
1460 | |
1461 | gzgets returns buf which is a null-terminated string, or it returns NULL |
1462 | for end-of-file or in case of error. If there was an error, the contents at |
1463 | buf are indeterminate. |
1464 | */ |
1465 | |
1466 | ZEXTERN int ZEXPORT gzputc(gzFile file, int c); |
1467 | /* |
1468 | Writes c, converted to an unsigned char, into the compressed file. gzputc |
1469 | returns the value that was written, or -1 in case of error. |
1470 | */ |
1471 | |
1472 | ZEXTERN int ZEXPORT gzgetc(gzFile file); |
1473 | /* |
1474 | Reads one byte from the compressed file. gzgetc returns this byte or -1 |
1475 | in case of end of file or error. This is implemented as a macro for speed. |
1476 | As such, it does not do all of the checking the other functions do. I.e. |
1477 | it does not check to see if file is NULL, nor whether the structure file |
1478 | points to has been clobbered or not. |
1479 | */ |
1480 | |
1481 | ZEXTERN int ZEXPORT gzungetc(int c, gzFile file); |
1482 | /* |
1483 | Push one character back onto the stream to be read as the first character |
1484 | on the next read. At least one character of push-back is allowed. |
1485 | gzungetc() returns the character pushed, or -1 on failure. gzungetc() will |
1486 | fail if c is -1, and may fail if a character has been pushed but not read |
1487 | yet. If gzungetc is used immediately after gzopen or gzdopen, at least the |
1488 | output buffer size of pushed characters is allowed. (See gzbuffer above.) |
1489 | The pushed character will be discarded if the stream is repositioned with |
1490 | gzseek() or gzrewind(). |
1491 | */ |
1492 | |
1493 | ZEXTERN int ZEXPORT gzflush(gzFile file, int flush); |
1494 | /* |
1495 | Flushes all pending output into the compressed file. The parameter flush |
1496 | is as in the deflate() function. The return value is the zlib error number |
1497 | (see function gzerror below). gzflush is only permitted when writing. |
1498 | |
1499 | If the flush parameter is Z_FINISH, the remaining data is written and the |
1500 | gzip stream is completed in the output. If gzwrite() is called again, a new |
1501 | gzip stream will be started in the output. gzread() is able to read such |
1502 | concatenated gzip streams. |
1503 | |
1504 | gzflush should be called only when strictly necessary because it will |
1505 | degrade compression if called too often. |
1506 | */ |
1507 | |
1508 | /* |
1509 | ZEXTERN z_off_t ZEXPORT gzseek (gzFile file, z_off_t offset, int whence); |
1510 | |
1511 | Sets the starting position for the next gzread or gzwrite on the given |
1512 | compressed file. The offset represents a number of bytes in the |
1513 | uncompressed data stream. The whence parameter is defined as in lseek(2); |
1514 | the value SEEK_END is not supported. |
1515 | |
1516 | If the file is opened for reading, this function is emulated but can be |
1517 | extremely slow. If the file is opened for writing, only forward seeks are |
1518 | supported; gzseek then compresses a sequence of zeroes up to the new |
1519 | starting position. |
1520 | |
1521 | gzseek returns the resulting offset location as measured in bytes from |
1522 | the beginning of the uncompressed stream, or -1 in case of error, in |
1523 | particular if the file is opened for writing and the new starting position |
1524 | would be before the current position. |
1525 | */ |
1526 | |
1527 | ZEXTERN int ZEXPORT gzrewind(gzFile file); |
1528 | /* |
1529 | Rewinds the given file. This function is supported only for reading. |
1530 | |
1531 | gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET) |
1532 | */ |
1533 | |
1534 | /* |
1535 | ZEXTERN z_off_t ZEXPORT gztell(gzFile file); |
1536 | |
1537 | Returns the starting position for the next gzread or gzwrite on the given |
1538 | compressed file. This position represents a number of bytes in the |
1539 | uncompressed data stream, and is zero when starting, even if appending or |
1540 | reading a gzip stream from the middle of a file using gzdopen(). |
1541 | |
1542 | gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR) |
1543 | */ |
1544 | |
1545 | /* |
1546 | ZEXTERN z_off_t ZEXPORT gzoffset(gzFile file); |
1547 | |
1548 | Returns the current offset in the file being read or written. This offset |
1549 | includes the count of bytes that precede the gzip stream, for example when |
1550 | appending or when using gzdopen() for reading. When reading, the offset |
1551 | does not include as yet unused buffered input. This information can be used |
1552 | for a progress indicator. On error, gzoffset() returns -1. |
1553 | */ |
1554 | |
1555 | ZEXTERN int ZEXPORT gzeof(gzFile file); |
1556 | /* |
1557 | Returns true (1) if the end-of-file indicator has been set while reading, |
1558 | false (0) otherwise. Note that the end-of-file indicator is set only if the |
1559 | read tried to go past the end of the input, but came up short. Therefore, |
1560 | just like feof(), gzeof() may return false even if there is no more data to |
1561 | read, in the event that the last read request was for the exact number of |
1562 | bytes remaining in the input file. This will happen if the input file size |
1563 | is an exact multiple of the buffer size. |
1564 | |
1565 | If gzeof() returns true, then the read functions will return no more data, |
1566 | unless the end-of-file indicator is reset by gzclearerr() and the input file |
1567 | has grown since the previous end of file was detected. |
1568 | */ |
1569 | |
1570 | ZEXTERN int ZEXPORT gzdirect(gzFile file); |
1571 | /* |
1572 | Returns true (1) if file is being copied directly while reading, or false |
1573 | (0) if file is a gzip stream being decompressed. |
1574 | |
1575 | If the input file is empty, gzdirect() will return true, since the input |
1576 | does not contain a gzip stream. |
1577 | |
1578 | If gzdirect() is used immediately after gzopen() or gzdopen() it will |
1579 | cause buffers to be allocated to allow reading the file to determine if it |
1580 | is a gzip file. Therefore if gzbuffer() is used, it should be called before |
1581 | gzdirect(). |
1582 | |
1583 | When writing, gzdirect() returns true (1) if transparent writing was |
1584 | requested ("wT" for the gzopen() mode), or false (0) otherwise. (Note: |
1585 | gzdirect() is not needed when writing. Transparent writing must be |
1586 | explicitly requested, so the application already knows the answer. When |
1587 | linking statically, using gzdirect() will include all of the zlib code for |
1588 | gzip file reading and decompression, which may not be desired.) |
1589 | */ |
1590 | |
1591 | ZEXTERN int ZEXPORT gzclose(gzFile file); |
1592 | /* |
1593 | Flushes all pending output if necessary, closes the compressed file and |
1594 | deallocates the (de)compression state. Note that once file is closed, you |
1595 | cannot call gzerror with file, since its structures have been deallocated. |
1596 | gzclose must not be called more than once on the same file, just as free |
1597 | must not be called more than once on the same allocation. |
1598 | |
1599 | gzclose will return Z_STREAM_ERROR if file is not valid, Z_ERRNO on a |
1600 | file operation error, Z_MEM_ERROR if out of memory, Z_BUF_ERROR if the |
1601 | last read ended in the middle of a gzip stream, or Z_OK on success. |
1602 | */ |
1603 | |
1604 | ZEXTERN int ZEXPORT gzclose_r(gzFile file); |
1605 | ZEXTERN int ZEXPORT gzclose_w(gzFile file); |
1606 | /* |
1607 | Same as gzclose(), but gzclose_r() is only for use when reading, and |
1608 | gzclose_w() is only for use when writing or appending. The advantage to |
1609 | using these instead of gzclose() is that they avoid linking in zlib |
1610 | compression or decompression code that is not used when only reading or only |
1611 | writing respectively. If gzclose() is used, then both compression and |
1612 | decompression code will be included the application when linking to a static |
1613 | zlib library. |
1614 | */ |
1615 | |
1616 | ZEXTERN const char * ZEXPORT gzerror(gzFile file, int *errnum); |
1617 | /* |
1618 | Returns the error message for the last error which occurred on the given |
1619 | compressed file. errnum is set to zlib error number. If an error occurred |
1620 | in the file system and not in the compression library, errnum is set to |
1621 | Z_ERRNO and the application may consult errno to get the exact error code. |
1622 | |
1623 | The application must not modify the returned string. Future calls to |
1624 | this function may invalidate the previously returned string. If file is |
1625 | closed, then the string previously returned by gzerror will no longer be |
1626 | available. |
1627 | |
1628 | gzerror() should be used to distinguish errors from end-of-file for those |
1629 | functions above that do not distinguish those cases in their return values. |
1630 | */ |
1631 | |
1632 | ZEXTERN void ZEXPORT gzclearerr(gzFile file); |
1633 | /* |
1634 | Clears the error and end-of-file flags for file. This is analogous to the |
1635 | clearerr() function in stdio. This is useful for continuing to read a gzip |
1636 | file that is being written concurrently. |
1637 | */ |
1638 | |
1639 | |
1640 | /* checksum functions */ |
1641 | |
1642 | /* |
1643 | These functions are not related to compression but are exported |
1644 | anyway because they might be useful in applications using the compression |
1645 | library. |
1646 | */ |
1647 | |
1648 | ZEXTERN uint32_t ZEXPORT adler32(uint32_t adler, const unsigned char *buf, uint32_t len); |
1649 | /* |
1650 | Update a running Adler-32 checksum with the bytes buf[0..len-1] and |
1651 | return the updated checksum. If buf is NULL, this function returns the |
1652 | required initial value for the checksum. |
1653 | |
1654 | An Adler-32 checksum is almost as reliable as a CRC-32 but can be computed |
1655 | much faster. |
1656 | |
1657 | Usage example: |
1658 | |
1659 | uint32_t adler = adler32(0L, NULL, 0); |
1660 | |
1661 | while (read_buffer(buffer, length) != EOF) { |
1662 | adler = adler32(adler, buffer, length); |
1663 | } |
1664 | if (adler != original_adler) error(); |
1665 | */ |
1666 | |
1667 | ZEXTERN uint32_t ZEXPORT adler32_z (uint32_t adler, const unsigned char *buf, size_t len); |
1668 | /* |
1669 | Same as adler32(), but with a size_t length. |
1670 | */ |
1671 | |
1672 | /* |
1673 | ZEXTERN uint32_t ZEXPORT adler32_combine(uint32_t adler1, uint32_t adler2, z_off_t len2); |
1674 | |
1675 | Combine two Adler-32 checksums into one. For two sequences of bytes, seq1 |
1676 | and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for |
1677 | each, adler1 and adler2. adler32_combine() returns the Adler-32 checksum of |
1678 | seq1 and seq2 concatenated, requiring only adler1, adler2, and len2. Note |
1679 | that the z_off_t type (like off_t) is a signed integer. If len2 is |
1680 | negative, the result has no meaning or utility. |
1681 | */ |
1682 | |
1683 | ZEXTERN unsigned long ZEXPORT crc32(unsigned long crc, const unsigned char *buf, unsigned int len); |
1684 | /* |
1685 | Update a running CRC-32 with the bytes buf[0..len-1] and return the |
1686 | updated CRC-32. If buf is NULL, this function returns the required |
1687 | initial value for the crc. Pre- and post-conditioning (one's complement) is |
1688 | performed within this function so it shouldn't be done by the application. |
1689 | |
1690 | Usage example: |
1691 | |
1692 | uint32_t crc = crc32(0L, NULL, 0); |
1693 | |
1694 | while (read_buffer(buffer, length) != EOF) { |
1695 | crc = crc32(crc, buffer, length); |
1696 | } |
1697 | if (crc != original_crc) error(); |
1698 | */ |
1699 | |
1700 | ZEXTERN uint32_t ZEXPORT crc32_z (uint32_t crc, const unsigned char *buf, size_t len); |
1701 | /* |
1702 | Same as crc32(), but with a size_t length. |
1703 | */ |
1704 | |
1705 | /* |
1706 | ZEXTERN uint32_t ZEXPORT crc32_combine(uint32_t crc1, uint32_t crc2, z_off64_t len2); |
1707 | |
1708 | Combine two CRC-32 check values into one. For two sequences of bytes, |
1709 | seq1 and seq2 with lengths len1 and len2, CRC-32 check values were |
1710 | calculated for each, crc1 and crc2. crc32_combine() returns the CRC-32 |
1711 | check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and |
1712 | len2. |
1713 | */ |
1714 | |
1715 | /* |
1716 | ZEXTERN void ZEXPORT crc32_combine_gen(uint32_t op[32], z_off_t len2); |
1717 | |
1718 | Generate the operator op corresponding to length len2, to be used with |
1719 | crc32_combine_op(). op must have room for 32 z_crc_t values. (32 is the |
1720 | number of bits in the CRC.) |
1721 | */ |
1722 | |
1723 | ZEXTERN uint32_t ZEXPORT crc32_combine_op(uint32_t crc1, uint32_t crc2, |
1724 | const uint32_t *op); |
1725 | /* |
1726 | Give the same result as crc32_combine(), using op in place of len2. op is |
1727 | is generated from len2 by crc32_combine_gen(). This will be faster than |
1728 | crc32_combine() if the generated op is used many times. |
1729 | */ |
1730 | |
1731 | |
1732 | /* various hacks, don't look :) */ |
1733 | |
1734 | /* deflateInit and inflateInit are macros to allow checking the zlib version |
1735 | * and the compiler's view of z_stream: |
1736 | */ |
1737 | ZEXTERN int ZEXPORT deflateInit_(z_stream *strm, int level, const char *version, int stream_size); |
1738 | ZEXTERN int ZEXPORT inflateInit_(z_stream *strm, const char *version, int stream_size); |
1739 | ZEXTERN int ZEXPORT deflateInit2_(z_stream *strm, int level, int method, int windowBits, int memLevel, |
1740 | int strategy, const char *version, int stream_size); |
1741 | ZEXTERN int ZEXPORT inflateInit2_(z_stream *strm, int windowBits, const char *version, int stream_size); |
1742 | ZEXTERN int ZEXPORT inflateBackInit_(z_stream *strm, int windowBits, unsigned char *window, |
1743 | const char *version, int stream_size); |
1744 | #define deflateInit(strm, level) deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream)) |
1745 | #define inflateInit(strm) inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream)) |
1746 | #define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \ |
1747 | deflateInit2_((strm), (level), (method), (windowBits), (memLevel), \ |
1748 | (strategy), ZLIB_VERSION, (int)sizeof(z_stream)) |
1749 | #define inflateInit2(strm, windowBits) inflateInit2_((strm), (windowBits), ZLIB_VERSION, (int)sizeof(z_stream)) |
1750 | #define inflateBackInit(strm, windowBits, window) \ |
1751 | inflateBackInit_((strm), (windowBits), (window), ZLIB_VERSION, (int)sizeof(z_stream)) |
1752 | |
1753 | |
1754 | /* gzgetc() macro and its supporting function and exposed data structure. Note |
1755 | * that the real internal state is much larger than the exposed structure. |
1756 | * This abbreviated structure exposes just enough for the gzgetc() macro. The |
1757 | * user should not mess with these exposed elements, since their names or |
1758 | * behavior could change in the future, perhaps even capriciously. They can |
1759 | * only be used by the gzgetc() macro. You have been warned. |
1760 | */ |
1761 | struct gzFile_s { |
1762 | unsigned have; |
1763 | unsigned char *next; |
1764 | z_off64_t pos; |
1765 | }; |
1766 | ZEXTERN int ZEXPORT gzgetc_(gzFile file); /* backward compatibility */ |
1767 | # define gzgetc(g) ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g)) |
1768 | |
1769 | /* provide 64-bit offset functions if _LARGEFILE64_SOURCE defined, and/or |
1770 | * change the regular functions to 64 bits if _FILE_OFFSET_BITS is 64 (if |
1771 | * both are true, the application gets the *64 functions, and the regular |
1772 | * functions are changed to 64 bits) -- in case these are set on systems |
1773 | * without large file support, _LFS64_LARGEFILE must also be true |
1774 | */ |
1775 | #ifdef Z_LARGE64 |
1776 | ZEXTERN gzFile ZEXPORT gzopen64(const char *, const char *); |
1777 | ZEXTERN z_off64_t ZEXPORT gzseek64(gzFile, z_off64_t, int); |
1778 | ZEXTERN z_off64_t ZEXPORT gztell64(gzFile); |
1779 | ZEXTERN z_off64_t ZEXPORT gzoffset64(gzFile); |
1780 | #endif |
1781 | |
1782 | #if !defined(ZLIB_INTERNAL) && defined(Z_WANT64) |
1783 | # define gzopen gzopen64 |
1784 | # define gzseek gzseek64 |
1785 | # define gztell gztell64 |
1786 | # define gzoffset gzoffset64 |
1787 | # ifndef Z_LARGE64 |
1788 | ZEXTERN gzFile ZEXPORT gzopen64(const char *, const char *); |
1789 | ZEXTERN z_off_t ZEXPORT gzseek64(gzFile, z_off_t, int); |
1790 | ZEXTERN z_off_t ZEXPORT gztell64(gzFile); |
1791 | ZEXTERN z_off_t ZEXPORT gzoffset64(gzFile); |
1792 | # endif |
1793 | #else |
1794 | ZEXTERN gzFile ZEXPORT gzopen(const char *, const char *); |
1795 | ZEXTERN z_off_t ZEXPORT gzseek(gzFile, z_off_t, int); |
1796 | ZEXTERN z_off_t ZEXPORT gztell(gzFile); |
1797 | ZEXTERN z_off_t ZEXPORT gzoffset(gzFile); |
1798 | #endif |
1799 | |
1800 | |
1801 | /* provide 64-bit offset functions if _LARGEFILE64_SOURCE defined, and/or |
1802 | * change the regular functions to 64 bits if _FILE_OFFSET_BITS is 64 (if |
1803 | * both are true, the application gets the *64 functions, and the regular |
1804 | * functions are changed to 64 bits) -- in case these are set on systems |
1805 | * without large file support, _LFS64_LARGEFILE must also be true |
1806 | */ |
1807 | #ifdef Z_LARGE64 |
1808 | ZEXTERN uint32_t ZEXPORT adler32_combine64(uint32_t, uint32_t, z_off64_t); |
1809 | ZEXTERN uint32_t ZEXPORT crc32_combine64(uint32_t, uint32_t, z_off64_t); |
1810 | ZEXTERN void ZEXPORT crc32_combine_gen64(uint32_t *op, z_off64_t); |
1811 | #endif |
1812 | |
1813 | #if !defined(ZLIB_INTERNAL) && defined(Z_WANT64) |
1814 | # define adler32_combine adler32_combine64 |
1815 | # define crc32_combine crc32_combine64 |
1816 | # define crc32_combine_gen crc32_combine_gen64 |
1817 | # ifndef Z_LARGE64 |
1818 | ZEXTERN uint32_t ZEXPORT adler32_combine64(uint32_t, uint32_t, z_off_t); |
1819 | ZEXTERN uint32_t ZEXPORT crc32_combine64(uint32_t, uint32_t, z_off_t); |
1820 | ZEXTERN void ZEXPORT crc32_combine_gen64(uint32_t *op, z_off64_t); |
1821 | # endif |
1822 | #else |
1823 | ZEXTERN uint32_t ZEXPORT adler32_combine(uint32_t, uint32_t, z_off_t); |
1824 | ZEXTERN uint32_t ZEXPORT crc32_combine(uint32_t, uint32_t, z_off_t); |
1825 | ZEXTERN void ZEXPORT crc32_combine_gen(uint32_t *op, z_off_t); |
1826 | #endif |
1827 | |
1828 | |
1829 | /* undocumented functions */ |
1830 | ZEXTERN const char * ZEXPORT zError (int); |
1831 | ZEXTERN int ZEXPORT inflateSyncPoint (z_stream *); |
1832 | ZEXTERN const uint32_t * ZEXPORT get_crc_table (void); |
1833 | ZEXTERN int ZEXPORT inflateUndermine (z_stream *, int); |
1834 | ZEXTERN int ZEXPORT inflateValidate (z_stream *, int); |
1835 | ZEXTERN unsigned long ZEXPORT inflateCodesUsed (z_stream *); |
1836 | ZEXTERN int ZEXPORT inflateResetKeep (z_stream *); |
1837 | ZEXTERN int ZEXPORT deflateResetKeep (z_stream *); |
1838 | |
1839 | #if (defined(WIN32) || defined(__MINGW__)) |
1840 | ZEXTERN gzFile ZEXPORT gzopen_w(const wchar_t *path, const char *mode); |
1841 | #endif |
1842 | ZEXTERN int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va); |
1843 | |
1844 | #ifdef __cplusplus |
1845 | } |
1846 | #endif |
1847 | |
1848 | #endif /* ZLIB_H_ */ |
1849 | |