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zlib.h
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1 /* zlib.h -- interface of the 'zlib' general purpose compression library
2  version 1.2.12, March 11th, 2022
3 
4  Copyright (C) 1995-2022 Jean-loup Gailly and Mark Adler
5 
6  This software is provided 'as-is', without any express or implied
7  warranty. In no event will the authors be held liable for any damages
8  arising from the use of this software.
9 
10  Permission is granted to anyone to use this software for any purpose,
11  including commercial applications, and to alter it and redistribute it
12  freely, subject to the following restrictions:
13 
14  1. The origin of this software must not be misrepresented; you must not
15  claim that you wrote the original software. If you use this software
16  in a product, an acknowledgment in the product documentation would be
17  appreciated but is not required.
18  2. Altered source versions must be plainly marked as such, and must not be
19  misrepresented as being the original software.
20  3. This notice may not be removed or altered from any source distribution.
21 
22  Jean-loup Gailly Mark Adler
23  jloup@gzip.org madler@alumni.caltech.edu
24 
25 
26  The data format used by the zlib library is described by RFCs (Request for
27  Comments) 1950 to 1952 in the files http://tools.ietf.org/html/rfc1950
28  (zlib format), rfc1951 (deflate format) and rfc1952 (gzip format).
29 */
30 
31 #ifndef ZLIB_H
32 #define ZLIB_H
33 
34 #include "zconf.h"
35 
36 #ifdef __cplusplus
37 extern "C" {
38 #endif
39 
40 #define ZLIB_VERSION "1.2.12"
41 #define ZLIB_VERNUM 0x12c0
42 #define ZLIB_VER_MAJOR 1
43 #define ZLIB_VER_MINOR 2
44 #define ZLIB_VER_REVISION 12
45 #define ZLIB_VER_SUBREVISION 0
46 
47 /*
48  The 'zlib' compression library provides in-memory compression and
49  decompression functions, including integrity checks of the uncompressed data.
50  This version of the library supports only one compression method (deflation)
51  but other algorithms will be added later and will have the same stream
52  interface.
53 
54  Compression can be done in a single step if the buffers are large enough,
55  or can be done by repeated calls of the compression function. In the latter
56  case, the application must provide more input and/or consume the output
57  (providing more output space) before each call.
58 
59  The compressed data format used by default by the in-memory functions is
60  the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped
61  around a deflate stream, which is itself documented in RFC 1951.
62 
63  The library also supports reading and writing files in gzip (.gz) format
64  with an interface similar to that of stdio using the functions that start
65  with "gz". The gzip format is different from the zlib format. gzip is a
66  gzip wrapper, documented in RFC 1952, wrapped around a deflate stream.
67 
68  This library can optionally read and write gzip and raw deflate streams in
69  memory as well.
70 
71  The zlib format was designed to be compact and fast for use in memory
72  and on communications channels. The gzip format was designed for single-
73  file compression on file systems, has a larger header than zlib to maintain
74  directory information, and uses a different, slower check method than zlib.
75 
76  The library does not install any signal handler. The decoder checks
77  the consistency of the compressed data, so the library should never crash
78  even in the case of corrupted input.
79 */
80 
81 typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
82 typedef void (*free_func) OF((voidpf opaque, voidpf address));
83 
84 struct internal_state;
85 
86 typedef struct z_stream_s {
87  z_const Bytef *next_in; /* next input byte */
88  uInt avail_in; /* number of bytes available at next_in */
89  uLong total_in; /* total number of input bytes read so far */
90 
91  Bytef *next_out; /* next output byte will go here */
92  uInt avail_out; /* remaining free space at next_out */
93  uLong total_out; /* total number of bytes output so far */
94 
95  z_const char *msg; /* last error message, NULL if no error */
96  struct internal_state FAR *state; /* not visible by applications */
97 
98  alloc_func zalloc; /* used to allocate the internal state */
99  free_func zfree; /* used to free the internal state */
100  voidpf opaque; /* private data object passed to zalloc and zfree */
101 
102  int data_type; /* best guess about the data type: binary or text
103  for deflate, or the decoding state for inflate */
104  uLong adler; /* Adler-32 or CRC-32 value of the uncompressed data */
105  uLong reserved; /* reserved for future use */
106 } z_stream;
107 
109 
110 /*
111  gzip header information passed to and from zlib routines. See RFC 1952
112  for more details on the meanings of these fields.
113 */
114 typedef struct gz_header_s {
115  int text; /* true if compressed data believed to be text */
116  uLong time; /* modification time */
117  int xflags; /* extra flags (not used when writing a gzip file) */
118  int os; /* operating system */
119  Bytef *extra; /* pointer to extra field or Z_NULL if none */
120  uInt extra_len; /* extra field length (valid if extra != Z_NULL) */
121  uInt extra_max; /* space at extra (only when reading header) */
122  Bytef *name; /* pointer to zero-terminated file name or Z_NULL */
123  uInt name_max; /* space at name (only when reading header) */
124  Bytef *comment; /* pointer to zero-terminated comment or Z_NULL */
125  uInt comm_max; /* space at comment (only when reading header) */
126  int hcrc; /* true if there was or will be a header crc */
127  int done; /* true when done reading gzip header (not used
128  when writing a gzip file) */
129 } gz_header;
130 
132 
133 /*
134  The application must update next_in and avail_in when avail_in has dropped
135  to zero. It must update next_out and avail_out when avail_out has dropped
136  to zero. The application must initialize zalloc, zfree and opaque before
137  calling the init function. All other fields are set by the compression
138  library and must not be updated by the application.
139 
140  The opaque value provided by the application will be passed as the first
141  parameter for calls of zalloc and zfree. This can be useful for custom
142  memory management. The compression library attaches no meaning to the
143  opaque value.
144 
145  zalloc must return Z_NULL if there is not enough memory for the object.
146  If zlib is used in a multi-threaded application, zalloc and zfree must be
147  thread safe. In that case, zlib is thread-safe. When zalloc and zfree are
148  Z_NULL on entry to the initialization function, they are set to internal
149  routines that use the standard library functions malloc() and free().
150 
151  On 16-bit systems, the functions zalloc and zfree must be able to allocate
152  exactly 65536 bytes, but will not be required to allocate more than this if
153  the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS, pointers
154  returned by zalloc for objects of exactly 65536 bytes *must* have their
155  offset normalized to zero. The default allocation function provided by this
156  library ensures this (see zutil.c). To reduce memory requirements and avoid
157  any allocation of 64K objects, at the expense of compression ratio, compile
158  the library with -DMAX_WBITS=14 (see zconf.h).
159 
160  The fields total_in and total_out can be used for statistics or progress
161  reports. After compression, total_in holds the total size of the
162  uncompressed data and may be saved for use by the decompressor (particularly
163  if the decompressor wants to decompress everything in a single step).
164 */
165 
166  /* constants */
167 
168 #define Z_NO_FLUSH 0
169 #define Z_PARTIAL_FLUSH 1
170 #define Z_SYNC_FLUSH 2
171 #define Z_FULL_FLUSH 3
172 #define Z_FINISH 4
173 #define Z_BLOCK 5
174 #define Z_TREES 6
175 /* Allowed flush values; see deflate() and inflate() below for details */
176 
177 #define Z_OK 0
178 #define Z_STREAM_END 1
179 #define Z_NEED_DICT 2
180 #define Z_ERRNO (-1)
181 #define Z_STREAM_ERROR (-2)
182 #define Z_DATA_ERROR (-3)
183 #define Z_MEM_ERROR (-4)
184 #define Z_BUF_ERROR (-5)
185 #define Z_VERSION_ERROR (-6)
186 /* Return codes for the compression/decompression functions. Negative values
187  * are errors, positive values are used for special but normal events.
188  */
189 
190 #define Z_NO_COMPRESSION 0
191 #define Z_BEST_SPEED 1
192 #define Z_BEST_COMPRESSION 9
193 #define Z_DEFAULT_COMPRESSION (-1)
194 /* compression levels */
195 
196 #define Z_FILTERED 1
197 #define Z_HUFFMAN_ONLY 2
198 #define Z_RLE 3
199 #define Z_FIXED 4
200 #define Z_DEFAULT_STRATEGY 0
201 /* compression strategy; see deflateInit2() below for details */
202 
203 #define Z_BINARY 0
204 #define Z_TEXT 1
205 #define Z_ASCII Z_TEXT /* for compatibility with 1.2.2 and earlier */
206 #define Z_UNKNOWN 2
207 /* Possible values of the data_type field for deflate() */
208 
209 #define Z_DEFLATED 8
210 /* The deflate compression method (the only one supported in this version) */
211 
212 #define Z_NULL 0 /* for initializing zalloc, zfree, opaque */
213 
214 #define zlib_version zlibVersion()
215 /* for compatibility with versions < 1.0.2 */
216 
217 
218  /* basic functions */
219 
220 ZEXTERN const char * ZEXPORT zlibVersion OF((void));
221 /* The application can compare zlibVersion and ZLIB_VERSION for consistency.
222  If the first character differs, the library code actually used is not
223  compatible with the zlib.h header file used by the application. This check
224  is automatically made by deflateInit and inflateInit.
225  */
226 
227 /*
228 ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level));
229 
230  Initializes the internal stream state for compression. The fields
231  zalloc, zfree and opaque must be initialized before by the caller. If
232  zalloc and zfree are set to Z_NULL, deflateInit updates them to use default
233  allocation functions.
234 
235  The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9:
236  1 gives best speed, 9 gives best compression, 0 gives no compression at all
237  (the input data is simply copied a block at a time). Z_DEFAULT_COMPRESSION
238  requests a default compromise between speed and compression (currently
239  equivalent to level 6).
240 
241  deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
242  memory, Z_STREAM_ERROR if level is not a valid compression level, or
243  Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible
244  with the version assumed by the caller (ZLIB_VERSION). msg is set to null
245  if there is no error message. deflateInit does not perform any compression:
246  this will be done by deflate().
247 */
248 
249 
250 ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));
251 /*
252  deflate compresses as much data as possible, and stops when the input
253  buffer becomes empty or the output buffer becomes full. It may introduce
254  some output latency (reading input without producing any output) except when
255  forced to flush.
256 
257  The detailed semantics are as follows. deflate performs one or both of the
258  following actions:
259 
260  - Compress more input starting at next_in and update next_in and avail_in
261  accordingly. If not all input can be processed (because there is not
262  enough room in the output buffer), next_in and avail_in are updated and
263  processing will resume at this point for the next call of deflate().
264 
265  - Generate more output starting at next_out and update next_out and avail_out
266  accordingly. This action is forced if the parameter flush is non zero.
267  Forcing flush frequently degrades the compression ratio, so this parameter
268  should be set only when necessary. Some output may be provided even if
269  flush is zero.
270 
271  Before the call of deflate(), the application should ensure that at least
272  one of the actions is possible, by providing more input and/or consuming more
273  output, and updating avail_in or avail_out accordingly; avail_out should
274  never be zero before the call. The application can consume the compressed
275  output when it wants, for example when the output buffer is full (avail_out
276  == 0), or after each call of deflate(). If deflate returns Z_OK and with
277  zero avail_out, it must be called again after making room in the output
278  buffer because there might be more output pending. See deflatePending(),
279  which can be used if desired to determine whether or not there is more ouput
280  in that case.
281 
282  Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to
283  decide how much data to accumulate before producing output, in order to
284  maximize compression.
285 
286  If the parameter flush is set to Z_SYNC_FLUSH, all pending output is
287  flushed to the output buffer and the output is aligned on a byte boundary, so
288  that the decompressor can get all input data available so far. (In
289  particular avail_in is zero after the call if enough output space has been
290  provided before the call.) Flushing may degrade compression for some
291  compression algorithms and so it should be used only when necessary. This
292  completes the current deflate block and follows it with an empty stored block
293  that is three bits plus filler bits to the next byte, followed by four bytes
294  (00 00 ff ff).
295 
296  If flush is set to Z_PARTIAL_FLUSH, all pending output is flushed to the
297  output buffer, but the output is not aligned to a byte boundary. All of the
298  input data so far will be available to the decompressor, as for Z_SYNC_FLUSH.
299  This completes the current deflate block and follows it with an empty fixed
300  codes block that is 10 bits long. This assures that enough bytes are output
301  in order for the decompressor to finish the block before the empty fixed
302  codes block.
303 
304  If flush is set to Z_BLOCK, a deflate block is completed and emitted, as
305  for Z_SYNC_FLUSH, but the output is not aligned on a byte boundary, and up to
306  seven bits of the current block are held to be written as the next byte after
307  the next deflate block is completed. In this case, the decompressor may not
308  be provided enough bits at this point in order to complete decompression of
309  the data provided so far to the compressor. It may need to wait for the next
310  block to be emitted. This is for advanced applications that need to control
311  the emission of deflate blocks.
312 
313  If flush is set to Z_FULL_FLUSH, all output is flushed as with
314  Z_SYNC_FLUSH, and the compression state is reset so that decompression can
315  restart from this point if previous compressed data has been damaged or if
316  random access is desired. Using Z_FULL_FLUSH too often can seriously degrade
317  compression.
318 
319  If deflate returns with avail_out == 0, this function must be called again
320  with the same value of the flush parameter and more output space (updated
321  avail_out), until the flush is complete (deflate returns with non-zero
322  avail_out). In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that
323  avail_out is greater than six to avoid repeated flush markers due to
324  avail_out == 0 on return.
325 
326  If the parameter flush is set to Z_FINISH, pending input is processed,
327  pending output is flushed and deflate returns with Z_STREAM_END if there was
328  enough output space. If deflate returns with Z_OK or Z_BUF_ERROR, this
329  function must be called again with Z_FINISH and more output space (updated
330  avail_out) but no more input data, until it returns with Z_STREAM_END or an
331  error. After deflate has returned Z_STREAM_END, the only possible operations
332  on the stream are deflateReset or deflateEnd.
333 
334  Z_FINISH can be used in the first deflate call after deflateInit if all the
335  compression is to be done in a single step. In order to complete in one
336  call, avail_out must be at least the value returned by deflateBound (see
337  below). Then deflate is guaranteed to return Z_STREAM_END. If not enough
338  output space is provided, deflate will not return Z_STREAM_END, and it must
339  be called again as described above.
340 
341  deflate() sets strm->adler to the Adler-32 checksum of all input read
342  so far (that is, total_in bytes). If a gzip stream is being generated, then
343  strm->adler will be the CRC-32 checksum of the input read so far. (See
344  deflateInit2 below.)
345 
346  deflate() may update strm->data_type if it can make a good guess about
347  the input data type (Z_BINARY or Z_TEXT). If in doubt, the data is
348  considered binary. This field is only for information purposes and does not
349  affect the compression algorithm in any manner.
350 
351  deflate() returns Z_OK if some progress has been made (more input
352  processed or more output produced), Z_STREAM_END if all input has been
353  consumed and all output has been produced (only when flush is set to
354  Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example
355  if next_in or next_out was Z_NULL or the state was inadvertently written over
356  by the application), or Z_BUF_ERROR if no progress is possible (for example
357  avail_in or avail_out was zero). Note that Z_BUF_ERROR is not fatal, and
358  deflate() can be called again with more input and more output space to
359  continue compressing.
360 */
361 
362 
364 /*
365  All dynamically allocated data structures for this stream are freed.
366  This function discards any unprocessed input and does not flush any pending
367  output.
368 
369  deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the
370  stream state was inconsistent, Z_DATA_ERROR if the stream was freed
371  prematurely (some input or output was discarded). In the error case, msg
372  may be set but then points to a static string (which must not be
373  deallocated).
374 */
375 
376 
377 /*
378 ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm));
379 
380  Initializes the internal stream state for decompression. The fields
381  next_in, avail_in, zalloc, zfree and opaque must be initialized before by
382  the caller. In the current version of inflate, the provided input is not
383  read or consumed. The allocation of a sliding window will be deferred to
384  the first call of inflate (if the decompression does not complete on the
385  first call). If zalloc and zfree are set to Z_NULL, inflateInit updates
386  them to use default allocation functions.
387 
388  inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
389  memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
390  version assumed by the caller, or Z_STREAM_ERROR if the parameters are
391  invalid, such as a null pointer to the structure. msg is set to null if
392  there is no error message. inflateInit does not perform any decompression.
393  Actual decompression will be done by inflate(). So next_in, and avail_in,
394  next_out, and avail_out are unused and unchanged. The current
395  implementation of inflateInit() does not process any header information --
396  that is deferred until inflate() is called.
397 */
398 
399 
400 ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush));
401 /*
402  inflate decompresses as much data as possible, and stops when the input
403  buffer becomes empty or the output buffer becomes full. It may introduce
404  some output latency (reading input without producing any output) except when
405  forced to flush.
406 
407  The detailed semantics are as follows. inflate performs one or both of the
408  following actions:
409 
410  - Decompress more input starting at next_in and update next_in and avail_in
411  accordingly. If not all input can be processed (because there is not
412  enough room in the output buffer), then next_in and avail_in are updated
413  accordingly, and processing will resume at this point for the next call of
414  inflate().
415 
416  - Generate more output starting at next_out and update next_out and avail_out
417  accordingly. inflate() provides as much output as possible, until there is
418  no more input data or no more space in the output buffer (see below about
419  the flush parameter).
420 
421  Before the call of inflate(), the application should ensure that at least
422  one of the actions is possible, by providing more input and/or consuming more
423  output, and updating the next_* and avail_* values accordingly. If the
424  caller of inflate() does not provide both available input and available
425  output space, it is possible that there will be no progress made. The
426  application can consume the uncompressed output when it wants, for example
427  when the output buffer is full (avail_out == 0), or after each call of
428  inflate(). If inflate returns Z_OK and with zero avail_out, it must be
429  called again after making room in the output buffer because there might be
430  more output pending.
431 
432  The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH, Z_FINISH,
433  Z_BLOCK, or Z_TREES. Z_SYNC_FLUSH requests that inflate() flush as much
434  output as possible to the output buffer. Z_BLOCK requests that inflate()
435  stop if and when it gets to the next deflate block boundary. When decoding
436  the zlib or gzip format, this will cause inflate() to return immediately
437  after the header and before the first block. When doing a raw inflate,
438  inflate() will go ahead and process the first block, and will return when it
439  gets to the end of that block, or when it runs out of data.
440 
441  The Z_BLOCK option assists in appending to or combining deflate streams.
442  To assist in this, on return inflate() always sets strm->data_type to the
443  number of unused bits in the last byte taken from strm->next_in, plus 64 if
444  inflate() is currently decoding the last block in the deflate stream, plus
445  128 if inflate() returned immediately after decoding an end-of-block code or
446  decoding the complete header up to just before the first byte of the deflate
447  stream. The end-of-block will not be indicated until all of the uncompressed
448  data from that block has been written to strm->next_out. The number of
449  unused bits may in general be greater than seven, except when bit 7 of
450  data_type is set, in which case the number of unused bits will be less than
451  eight. data_type is set as noted here every time inflate() returns for all
452  flush options, and so can be used to determine the amount of currently
453  consumed input in bits.
454 
455  The Z_TREES option behaves as Z_BLOCK does, but it also returns when the
456  end of each deflate block header is reached, before any actual data in that
457  block is decoded. This allows the caller to determine the length of the
458  deflate block header for later use in random access within a deflate block.
459  256 is added to the value of strm->data_type when inflate() returns
460  immediately after reaching the end of the deflate block header.
461 
462  inflate() should normally be called until it returns Z_STREAM_END or an
463  error. However if all decompression is to be performed in a single step (a
464  single call of inflate), the parameter flush should be set to Z_FINISH. In
465  this case all pending input is processed and all pending output is flushed;
466  avail_out must be large enough to hold all of the uncompressed data for the
467  operation to complete. (The size of the uncompressed data may have been
468  saved by the compressor for this purpose.) The use of Z_FINISH is not
469  required to perform an inflation in one step. However it may be used to
470  inform inflate that a faster approach can be used for the single inflate()
471  call. Z_FINISH also informs inflate to not maintain a sliding window if the
472  stream completes, which reduces inflate's memory footprint. If the stream
473  does not complete, either because not all of the stream is provided or not
474  enough output space is provided, then a sliding window will be allocated and
475  inflate() can be called again to continue the operation as if Z_NO_FLUSH had
476  been used.
477 
478  In this implementation, inflate() always flushes as much output as
479  possible to the output buffer, and always uses the faster approach on the
480  first call. So the effects of the flush parameter in this implementation are
481  on the return value of inflate() as noted below, when inflate() returns early
482  when Z_BLOCK or Z_TREES is used, and when inflate() avoids the allocation of
483  memory for a sliding window when Z_FINISH is used.
484 
485  If a preset dictionary is needed after this call (see inflateSetDictionary
486  below), inflate sets strm->adler to the Adler-32 checksum of the dictionary
487  chosen by the compressor and returns Z_NEED_DICT; otherwise it sets
488  strm->adler to the Adler-32 checksum of all output produced so far (that is,
489  total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described
490  below. At the end of the stream, inflate() checks that its computed Adler-32
491  checksum is equal to that saved by the compressor and returns Z_STREAM_END
492  only if the checksum is correct.
493 
494  inflate() can decompress and check either zlib-wrapped or gzip-wrapped
495  deflate data. The header type is detected automatically, if requested when
496  initializing with inflateInit2(). Any information contained in the gzip
497  header is not retained unless inflateGetHeader() is used. When processing
498  gzip-wrapped deflate data, strm->adler32 is set to the CRC-32 of the output
499  produced so far. The CRC-32 is checked against the gzip trailer, as is the
500  uncompressed length, modulo 2^32.
501 
502  inflate() returns Z_OK if some progress has been made (more input processed
503  or more output produced), Z_STREAM_END if the end of the compressed data has
504  been reached and all uncompressed output has been produced, Z_NEED_DICT if a
505  preset dictionary is needed at this point, Z_DATA_ERROR if the input data was
506  corrupted (input stream not conforming to the zlib format or incorrect check
507  value, in which case strm->msg points to a string with a more specific
508  error), Z_STREAM_ERROR if the stream structure was inconsistent (for example
509  next_in or next_out was Z_NULL, or the state was inadvertently written over
510  by the application), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR
511  if no progress was possible or if there was not enough room in the output
512  buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and
513  inflate() can be called again with more input and more output space to
514  continue decompressing. If Z_DATA_ERROR is returned, the application may
515  then call inflateSync() to look for a good compression block if a partial
516  recovery of the data is to be attempted.
517 */
518 
519 
521 /*
522  All dynamically allocated data structures for this stream are freed.
523  This function discards any unprocessed input and does not flush any pending
524  output.
525 
526  inflateEnd returns Z_OK if success, or Z_STREAM_ERROR if the stream state
527  was inconsistent.
528 */
529 
530 
531  /* Advanced functions */
532 
533 /*
534  The following functions are needed only in some special applications.
535 */
536 
537 /*
538 ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm,
539  int level,
540  int method,
541  int windowBits,
542  int memLevel,
543  int strategy));
544 
545  This is another version of deflateInit with more compression options. The
546  fields zalloc, zfree and opaque must be initialized before by the caller.
547 
548  The method parameter is the compression method. It must be Z_DEFLATED in
549  this version of the library.
550 
551  The windowBits parameter is the base two logarithm of the window size
552  (the size of the history buffer). It should be in the range 8..15 for this
553  version of the library. Larger values of this parameter result in better
554  compression at the expense of memory usage. The default value is 15 if
555  deflateInit is used instead.
556 
557  For the current implementation of deflate(), a windowBits value of 8 (a
558  window size of 256 bytes) is not supported. As a result, a request for 8
559  will result in 9 (a 512-byte window). In that case, providing 8 to
560  inflateInit2() will result in an error when the zlib header with 9 is
561  checked against the initialization of inflate(). The remedy is to not use 8
562  with deflateInit2() with this initialization, or at least in that case use 9
563  with inflateInit2().
564 
565  windowBits can also be -8..-15 for raw deflate. In this case, -windowBits
566  determines the window size. deflate() will then generate raw deflate data
567  with no zlib header or trailer, and will not compute a check value.
568 
569  windowBits can also be greater than 15 for optional gzip encoding. Add
570  16 to windowBits to write a simple gzip header and trailer around the
571  compressed data instead of a zlib wrapper. The gzip header will have no
572  file name, no extra data, no comment, no modification time (set to zero), no
573  header crc, and the operating system will be set to the appropriate value,
574  if the operating system was determined at compile time. If a gzip stream is
575  being written, strm->adler is a CRC-32 instead of an Adler-32.
576 
577  For raw deflate or gzip encoding, a request for a 256-byte window is
578  rejected as invalid, since only the zlib header provides a means of
579  transmitting the window size to the decompressor.
580 
581  The memLevel parameter specifies how much memory should be allocated
582  for the internal compression state. memLevel=1 uses minimum memory but is
583  slow and reduces compression ratio; memLevel=9 uses maximum memory for
584  optimal speed. The default value is 8. See zconf.h for total memory usage
585  as a function of windowBits and memLevel.
586 
587  The strategy parameter is used to tune the compression algorithm. Use the
588  value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a
589  filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no
590  string match), or Z_RLE to limit match distances to one (run-length
591  encoding). Filtered data consists mostly of small values with a somewhat
592  random distribution. In this case, the compression algorithm is tuned to
593  compress them better. The effect of Z_FILTERED is to force more Huffman
594  coding and less string matching; it is somewhat intermediate between
595  Z_DEFAULT_STRATEGY and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as
596  fast as Z_HUFFMAN_ONLY, but give better compression for PNG image data. The
597  strategy parameter only affects the compression ratio but not the
598  correctness of the compressed output even if it is not set appropriately.
599  Z_FIXED prevents the use of dynamic Huffman codes, allowing for a simpler
600  decoder for special applications.
601 
602  deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
603  memory, Z_STREAM_ERROR if any parameter is invalid (such as an invalid
604  method), or Z_VERSION_ERROR if the zlib library version (zlib_version) is
605  incompatible with the version assumed by the caller (ZLIB_VERSION). msg is
606  set to null if there is no error message. deflateInit2 does not perform any
607  compression: this will be done by deflate().
608 */
609 
611  const Bytef *dictionary,
612  uInt dictLength));
613 /*
614  Initializes the compression dictionary from the given byte sequence
615  without producing any compressed output. When using the zlib format, this
616  function must be called immediately after deflateInit, deflateInit2 or
617  deflateReset, and before any call of deflate. When doing raw deflate, this
618  function must be called either before any call of deflate, or immediately
619  after the completion of a deflate block, i.e. after all input has been
620  consumed and all output has been delivered when using any of the flush
621  options Z_BLOCK, Z_PARTIAL_FLUSH, Z_SYNC_FLUSH, or Z_FULL_FLUSH. The
622  compressor and decompressor must use exactly the same dictionary (see
623  inflateSetDictionary).
624 
625  The dictionary should consist of strings (byte sequences) that are likely
626  to be encountered later in the data to be compressed, with the most commonly
627  used strings preferably put towards the end of the dictionary. Using a
628  dictionary is most useful when the data to be compressed is short and can be
629  predicted with good accuracy; the data can then be compressed better than
630  with the default empty dictionary.
631 
632  Depending on the size of the compression data structures selected by
633  deflateInit or deflateInit2, a part of the dictionary may in effect be
634  discarded, for example if the dictionary is larger than the window size
635  provided in deflateInit or deflateInit2. Thus the strings most likely to be
636  useful should be put at the end of the dictionary, not at the front. In
637  addition, the current implementation of deflate will use at most the window
638  size minus 262 bytes of the provided dictionary.
639 
640  Upon return of this function, strm->adler is set to the Adler-32 value
641  of the dictionary; the decompressor may later use this value to determine
642  which dictionary has been used by the compressor. (The Adler-32 value
643  applies to the whole dictionary even if only a subset of the dictionary is
644  actually used by the compressor.) If a raw deflate was requested, then the
645  Adler-32 value is not computed and strm->adler is not set.
646 
647  deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a
648  parameter is invalid (e.g. dictionary being Z_NULL) or the stream state is
649  inconsistent (for example if deflate has already been called for this stream
650  or if not at a block boundary for raw deflate). deflateSetDictionary does
651  not perform any compression: this will be done by deflate().
652 */
653 
655  Bytef *dictionary,
656  uInt *dictLength));
657 /*
658  Returns the sliding dictionary being maintained by deflate. dictLength is
659  set to the number of bytes in the dictionary, and that many bytes are copied
660  to dictionary. dictionary must have enough space, where 32768 bytes is
661  always enough. If deflateGetDictionary() is called with dictionary equal to
662  Z_NULL, then only the dictionary length is returned, and nothing is copied.
663  Similary, if dictLength is Z_NULL, then it is not set.
664 
665  deflateGetDictionary() may return a length less than the window size, even
666  when more than the window size in input has been provided. It may return up
667  to 258 bytes less in that case, due to how zlib's implementation of deflate
668  manages the sliding window and lookahead for matches, where matches can be
669  up to 258 bytes long. If the application needs the last window-size bytes of
670  input, then that would need to be saved by the application outside of zlib.
671 
672  deflateGetDictionary returns Z_OK on success, or Z_STREAM_ERROR if the
673  stream state is inconsistent.
674 */
675 
677  z_streamp source));
678 /*
679  Sets the destination stream as a complete copy of the source stream.
680 
681  This function can be useful when several compression strategies will be
682  tried, for example when there are several ways of pre-processing the input
683  data with a filter. The streams that will be discarded should then be freed
684  by calling deflateEnd. Note that deflateCopy duplicates the internal
685  compression state which can be quite large, so this strategy is slow and can
686  consume lots of memory.
687 
688  deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
689  enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
690  (such as zalloc being Z_NULL). msg is left unchanged in both source and
691  destination.
692 */
693 
695 /*
696  This function is equivalent to deflateEnd followed by deflateInit, but
697  does not free and reallocate the internal compression state. The stream
698  will leave the compression level and any other attributes that may have been
699  set unchanged.
700 
701  deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
702  stream state was inconsistent (such as zalloc or state being Z_NULL).
703 */
704 
706  int level,
707  int strategy));
708 /*
709  Dynamically update the compression level and compression strategy. The
710  interpretation of level and strategy is as in deflateInit2(). This can be
711  used to switch between compression and straight copy of the input data, or
712  to switch to a different kind of input data requiring a different strategy.
713  If the compression approach (which is a function of the level) or the
714  strategy is changed, and if there have been any deflate() calls since the
715  state was initialized or reset, then the input available so far is
716  compressed with the old level and strategy using deflate(strm, Z_BLOCK).
717  There are three approaches for the compression levels 0, 1..3, and 4..9
718  respectively. The new level and strategy will take effect at the next call
719  of deflate().
720 
721  If a deflate(strm, Z_BLOCK) is performed by deflateParams(), and it does
722  not have enough output space to complete, then the parameter change will not
723  take effect. In this case, deflateParams() can be called again with the
724  same parameters and more output space to try again.
725 
726  In order to assure a change in the parameters on the first try, the
727  deflate stream should be flushed using deflate() with Z_BLOCK or other flush
728  request until strm.avail_out is not zero, before calling deflateParams().
729  Then no more input data should be provided before the deflateParams() call.
730  If this is done, the old level and strategy will be applied to the data
731  compressed before deflateParams(), and the new level and strategy will be
732  applied to the the data compressed after deflateParams().
733 
734  deflateParams returns Z_OK on success, Z_STREAM_ERROR if the source stream
735  state was inconsistent or if a parameter was invalid, or Z_BUF_ERROR if
736  there was not enough output space to complete the compression of the
737  available input data before a change in the strategy or approach. Note that
738  in the case of a Z_BUF_ERROR, the parameters are not changed. A return
739  value of Z_BUF_ERROR is not fatal, in which case deflateParams() can be
740  retried with more output space.
741 */
742 
744  int good_length,
745  int max_lazy,
746  int nice_length,
747  int max_chain));
748 /*
749  Fine tune deflate's internal compression parameters. This should only be
750  used by someone who understands the algorithm used by zlib's deflate for
751  searching for the best matching string, and even then only by the most
752  fanatic optimizer trying to squeeze out the last compressed bit for their
753  specific input data. Read the deflate.c source code for the meaning of the
754  max_lazy, good_length, nice_length, and max_chain parameters.
755 
756  deflateTune() can be called after deflateInit() or deflateInit2(), and
757  returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream.
758  */
759 
761  uLong sourceLen));
762 /*
763  deflateBound() returns an upper bound on the compressed size after
764  deflation of sourceLen bytes. It must be called after deflateInit() or
765  deflateInit2(), and after deflateSetHeader(), if used. This would be used
766  to allocate an output buffer for deflation in a single pass, and so would be
767  called before deflate(). If that first deflate() call is provided the
768  sourceLen input bytes, an output buffer allocated to the size returned by
769  deflateBound(), and the flush value Z_FINISH, then deflate() is guaranteed
770  to return Z_STREAM_END. Note that it is possible for the compressed size to
771  be larger than the value returned by deflateBound() if flush options other
772  than Z_FINISH or Z_NO_FLUSH are used.
773 */
774 
776  unsigned *pending,
777  int *bits));
778 /*
779  deflatePending() returns the number of bytes and bits of output that have
780  been generated, but not yet provided in the available output. The bytes not
781  provided would be due to the available output space having being consumed.
782  The number of bits of output not provided are between 0 and 7, where they
783  await more bits to join them in order to fill out a full byte. If pending
784  or bits are Z_NULL, then those values are not set.
785 
786  deflatePending returns Z_OK if success, or Z_STREAM_ERROR if the source
787  stream state was inconsistent.
788  */
789 
791  int bits,
792  int value));
793 /*
794  deflatePrime() inserts bits in the deflate output stream. The intent
795  is that this function is used to start off the deflate output with the bits
796  leftover from a previous deflate stream when appending to it. As such, this
797  function can only be used for raw deflate, and must be used before the first
798  deflate() call after a deflateInit2() or deflateReset(). bits must be less
799  than or equal to 16, and that many of the least significant bits of value
800  will be inserted in the output.
801 
802  deflatePrime returns Z_OK if success, Z_BUF_ERROR if there was not enough
803  room in the internal buffer to insert the bits, or Z_STREAM_ERROR if the
804  source stream state was inconsistent.
805 */
806 
808  gz_headerp head));
809 /*
810  deflateSetHeader() provides gzip header information for when a gzip
811  stream is requested by deflateInit2(). deflateSetHeader() may be called
812  after deflateInit2() or deflateReset() and before the first call of
813  deflate(). The text, time, os, extra field, name, and comment information
814  in the provided gz_header structure are written to the gzip header (xflag is
815  ignored -- the extra flags are set according to the compression level). The
816  caller must assure that, if not Z_NULL, name and comment are terminated with
817  a zero byte, and that if extra is not Z_NULL, that extra_len bytes are
818  available there. If hcrc is true, a gzip header crc is included. Note that
819  the current versions of the command-line version of gzip (up through version
820  1.3.x) do not support header crc's, and will report that it is a "multi-part
821  gzip file" and give up.
822 
823  If deflateSetHeader is not used, the default gzip header has text false,
824  the time set to zero, and os set to 255, with no extra, name, or comment
825  fields. The gzip header is returned to the default state by deflateReset().
826 
827  deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
828  stream state was inconsistent.
829 */
830 
831 /*
832 ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,
833  int windowBits));
834 
835  This is another version of inflateInit with an extra parameter. The
836  fields next_in, avail_in, zalloc, zfree and opaque must be initialized
837  before by the caller.
838 
839  The windowBits parameter is the base two logarithm of the maximum window
840  size (the size of the history buffer). It should be in the range 8..15 for
841  this version of the library. The default value is 15 if inflateInit is used
842  instead. windowBits must be greater than or equal to the windowBits value
843  provided to deflateInit2() while compressing, or it must be equal to 15 if
844  deflateInit2() was not used. If a compressed stream with a larger window
845  size is given as input, inflate() will return with the error code
846  Z_DATA_ERROR instead of trying to allocate a larger window.
847 
848  windowBits can also be zero to request that inflate use the window size in
849  the zlib header of the compressed stream.
850 
851  windowBits can also be -8..-15 for raw inflate. In this case, -windowBits
852  determines the window size. inflate() will then process raw deflate data,
853  not looking for a zlib or gzip header, not generating a check value, and not
854  looking for any check values for comparison at the end of the stream. This
855  is for use with other formats that use the deflate compressed data format
856  such as zip. Those formats provide their own check values. If a custom
857  format is developed using the raw deflate format for compressed data, it is
858  recommended that a check value such as an Adler-32 or a CRC-32 be applied to
859  the uncompressed data as is done in the zlib, gzip, and zip formats. For
860  most applications, the zlib format should be used as is. Note that comments
861  above on the use in deflateInit2() applies to the magnitude of windowBits.
862 
863  windowBits can also be greater than 15 for optional gzip decoding. Add
864  32 to windowBits to enable zlib and gzip decoding with automatic header
865  detection, or add 16 to decode only the gzip format (the zlib format will
866  return a Z_DATA_ERROR). If a gzip stream is being decoded, strm->adler is a
867  CRC-32 instead of an Adler-32. Unlike the gunzip utility and gzread() (see
868  below), inflate() will *not* automatically decode concatenated gzip members.
869  inflate() will return Z_STREAM_END at the end of the gzip member. The state
870  would need to be reset to continue decoding a subsequent gzip member. This
871  *must* be done if there is more data after a gzip member, in order for the
872  decompression to be compliant with the gzip standard (RFC 1952).
873 
874  inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
875  memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
876  version assumed by the caller, or Z_STREAM_ERROR if the parameters are
877  invalid, such as a null pointer to the structure. msg is set to null if
878  there is no error message. inflateInit2 does not perform any decompression
879  apart from possibly reading the zlib header if present: actual decompression
880  will be done by inflate(). (So next_in and avail_in may be modified, but
881  next_out and avail_out are unused and unchanged.) The current implementation
882  of inflateInit2() does not process any header information -- that is
883  deferred until inflate() is called.
884 */
885 
887  const Bytef *dictionary,
888  uInt dictLength));
889 /*
890  Initializes the decompression dictionary from the given uncompressed byte
891  sequence. This function must be called immediately after a call of inflate,
892  if that call returned Z_NEED_DICT. The dictionary chosen by the compressor
893  can be determined from the Adler-32 value returned by that call of inflate.
894  The compressor and decompressor must use exactly the same dictionary (see
895  deflateSetDictionary). For raw inflate, this function can be called at any
896  time to set the dictionary. If the provided dictionary is smaller than the
897  window and there is already data in the window, then the provided dictionary
898  will amend what's there. The application must insure that the dictionary
899  that was used for compression is provided.
900 
901  inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
902  parameter is invalid (e.g. dictionary being Z_NULL) or the stream state is
903  inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the
904  expected one (incorrect Adler-32 value). inflateSetDictionary does not
905  perform any decompression: this will be done by subsequent calls of
906  inflate().
907 */
908 
910  Bytef *dictionary,
911  uInt *dictLength));
912 /*
913  Returns the sliding dictionary being maintained by inflate. dictLength is
914  set to the number of bytes in the dictionary, and that many bytes are copied
915  to dictionary. dictionary must have enough space, where 32768 bytes is
916  always enough. If inflateGetDictionary() is called with dictionary equal to
917  Z_NULL, then only the dictionary length is returned, and nothing is copied.
918  Similary, if dictLength is Z_NULL, then it is not set.
919 
920  inflateGetDictionary returns Z_OK on success, or Z_STREAM_ERROR if the
921  stream state is inconsistent.
922 */
923 
925 /*
926  Skips invalid compressed data until a possible full flush point (see above
927  for the description of deflate with Z_FULL_FLUSH) can be found, or until all
928  available input is skipped. No output is provided.
929 
930  inflateSync searches for a 00 00 FF FF pattern in the compressed data.
931  All full flush points have this pattern, but not all occurrences of this
932  pattern are full flush points.
933 
934  inflateSync returns Z_OK if a possible full flush point has been found,
935  Z_BUF_ERROR if no more input was provided, Z_DATA_ERROR if no flush point
936  has been found, or Z_STREAM_ERROR if the stream structure was inconsistent.
937  In the success case, the application may save the current current value of
938  total_in which indicates where valid compressed data was found. In the
939  error case, the application may repeatedly call inflateSync, providing more
940  input each time, until success or end of the input data.
941 */
942 
944  z_streamp source));
945 /*
946  Sets the destination stream as a complete copy of the source stream.
947 
948  This function can be useful when randomly accessing a large stream. The
949  first pass through the stream can periodically record the inflate state,
950  allowing restarting inflate at those points when randomly accessing the
951  stream.
952 
953  inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
954  enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
955  (such as zalloc being Z_NULL). msg is left unchanged in both source and
956  destination.
957 */
958 
960 /*
961  This function is equivalent to inflateEnd followed by inflateInit,
962  but does not free and reallocate the internal decompression state. The
963  stream will keep attributes that may have been set by inflateInit2.
964 
965  inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
966  stream state was inconsistent (such as zalloc or state being Z_NULL).
967 */
968 
970  int windowBits));
971 /*
972  This function is the same as inflateReset, but it also permits changing
973  the wrap and window size requests. The windowBits parameter is interpreted
974  the same as it is for inflateInit2. If the window size is changed, then the
975  memory allocated for the window is freed, and the window will be reallocated
976  by inflate() if needed.
977 
978  inflateReset2 returns Z_OK if success, or Z_STREAM_ERROR if the source
979  stream state was inconsistent (such as zalloc or state being Z_NULL), or if
980  the windowBits parameter is invalid.
981 */
982 
984  int bits,
985  int value));
986 /*
987  This function inserts bits in the inflate input stream. The intent is
988  that this function is used to start inflating at a bit position in the
989  middle of a byte. The provided bits will be used before any bytes are used
990  from next_in. This function should only be used with raw inflate, and
991  should be used before the first inflate() call after inflateInit2() or
992  inflateReset(). bits must be less than or equal to 16, and that many of the
993  least significant bits of value will be inserted in the input.
994 
995  If bits is negative, then the input stream bit buffer is emptied. Then
996  inflatePrime() can be called again to put bits in the buffer. This is used
997  to clear out bits leftover after feeding inflate a block description prior
998  to feeding inflate codes.
999 
1000  inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source
1001  stream state was inconsistent.
1002 */
1003 
1004 ZEXTERN long ZEXPORT inflateMark OF((z_streamp strm));
1005 /*
1006  This function returns two values, one in the lower 16 bits of the return
1007  value, and the other in the remaining upper bits, obtained by shifting the
1008  return value down 16 bits. If the upper value is -1 and the lower value is
1009  zero, then inflate() is currently decoding information outside of a block.
1010  If the upper value is -1 and the lower value is non-zero, then inflate is in
1011  the middle of a stored block, with the lower value equaling the number of
1012  bytes from the input remaining to copy. If the upper value is not -1, then
1013  it is the number of bits back from the current bit position in the input of
1014  the code (literal or length/distance pair) currently being processed. In
1015  that case the lower value is the number of bytes already emitted for that
1016  code.
1017 
1018  A code is being processed if inflate is waiting for more input to complete
1019  decoding of the code, or if it has completed decoding but is waiting for
1020  more output space to write the literal or match data.
1021 
1022  inflateMark() is used to mark locations in the input data for random
1023  access, which may be at bit positions, and to note those cases where the
1024  output of a code may span boundaries of random access blocks. The current
1025  location in the input stream can be determined from avail_in and data_type
1026  as noted in the description for the Z_BLOCK flush parameter for inflate.
1027 
1028  inflateMark returns the value noted above, or -65536 if the provided
1029  source stream state was inconsistent.
1030 */
1031 
1033  gz_headerp head));
1034 /*
1035  inflateGetHeader() requests that gzip header information be stored in the
1036  provided gz_header structure. inflateGetHeader() may be called after
1037  inflateInit2() or inflateReset(), and before the first call of inflate().
1038  As inflate() processes the gzip stream, head->done is zero until the header
1039  is completed, at which time head->done is set to one. If a zlib stream is
1040  being decoded, then head->done is set to -1 to indicate that there will be
1041  no gzip header information forthcoming. Note that Z_BLOCK or Z_TREES can be
1042  used to force inflate() to return immediately after header processing is
1043  complete and before any actual data is decompressed.
1044 
1045  The text, time, xflags, and os fields are filled in with the gzip header
1046  contents. hcrc is set to true if there is a header CRC. (The header CRC
1047  was valid if done is set to one.) If extra is not Z_NULL, then extra_max
1048  contains the maximum number of bytes to write to extra. Once done is true,
1049  extra_len contains the actual extra field length, and extra contains the
1050  extra field, or that field truncated if extra_max is less than extra_len.
1051  If name is not Z_NULL, then up to name_max characters are written there,
1052  terminated with a zero unless the length is greater than name_max. If
1053  comment is not Z_NULL, then up to comm_max characters are written there,
1054  terminated with a zero unless the length is greater than comm_max. When any
1055  of extra, name, or comment are not Z_NULL and the respective field is not
1056  present in the header, then that field is set to Z_NULL to signal its
1057  absence. This allows the use of deflateSetHeader() with the returned
1058  structure to duplicate the header. However if those fields are set to
1059  allocated memory, then the application will need to save those pointers
1060  elsewhere so that they can be eventually freed.
1061 
1062  If inflateGetHeader is not used, then the header information is simply
1063  discarded. The header is always checked for validity, including the header
1064  CRC if present. inflateReset() will reset the process to discard the header
1065  information. The application would need to call inflateGetHeader() again to
1066  retrieve the header from the next gzip stream.
1067 
1068  inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
1069  stream state was inconsistent.
1070 */
1071 
1072 /*
1073 ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits,
1074  unsigned char FAR *window));
1075 
1076  Initialize the internal stream state for decompression using inflateBack()
1077  calls. The fields zalloc, zfree and opaque in strm must be initialized
1078  before the call. If zalloc and zfree are Z_NULL, then the default library-
1079  derived memory allocation routines are used. windowBits is the base two
1080  logarithm of the window size, in the range 8..15. window is a caller
1081  supplied buffer of that size. Except for special applications where it is
1082  assured that deflate was used with small window sizes, windowBits must be 15
1083  and a 32K byte window must be supplied to be able to decompress general
1084  deflate streams.
1085 
1086  See inflateBack() for the usage of these routines.
1087 
1088  inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of
1089  the parameters are invalid, Z_MEM_ERROR if the internal state could not be
1090  allocated, or Z_VERSION_ERROR if the version of the library does not match
1091  the version of the header file.
1092 */
1093 
1094 typedef unsigned (*in_func) OF((void FAR *,
1095  z_const unsigned char FAR * FAR *));
1096 typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned));
1097 
1099  in_func in, void FAR *in_desc,
1100  out_func out, void FAR *out_desc));
1101 /*
1102  inflateBack() does a raw inflate with a single call using a call-back
1103  interface for input and output. This is potentially more efficient than
1104  inflate() for file i/o applications, in that it avoids copying between the
1105  output and the sliding window by simply making the window itself the output
1106  buffer. inflate() can be faster on modern CPUs when used with large
1107  buffers. inflateBack() trusts the application to not change the output
1108  buffer passed by the output function, at least until inflateBack() returns.
1109 
1110  inflateBackInit() must be called first to allocate the internal state
1111  and to initialize the state with the user-provided window buffer.
1112  inflateBack() may then be used multiple times to inflate a complete, raw
1113  deflate stream with each call. inflateBackEnd() is then called to free the
1114  allocated state.
1115 
1116  A raw deflate stream is one with no zlib or gzip header or trailer.
1117  This routine would normally be used in a utility that reads zip or gzip
1118  files and writes out uncompressed files. The utility would decode the
1119  header and process the trailer on its own, hence this routine expects only
1120  the raw deflate stream to decompress. This is different from the default
1121  behavior of inflate(), which expects a zlib header and trailer around the
1122  deflate stream.
1123 
1124  inflateBack() uses two subroutines supplied by the caller that are then
1125  called by inflateBack() for input and output. inflateBack() calls those
1126  routines until it reads a complete deflate stream and writes out all of the
1127  uncompressed data, or until it encounters an error. The function's
1128  parameters and return types are defined above in the in_func and out_func
1129  typedefs. inflateBack() will call in(in_desc, &buf) which should return the
1130  number of bytes of provided input, and a pointer to that input in buf. If
1131  there is no input available, in() must return zero -- buf is ignored in that
1132  case -- and inflateBack() will return a buffer error. inflateBack() will
1133  call out(out_desc, buf, len) to write the uncompressed data buf[0..len-1].
1134  out() should return zero on success, or non-zero on failure. If out()
1135  returns non-zero, inflateBack() will return with an error. Neither in() nor
1136  out() are permitted to change the contents of the window provided to
1137  inflateBackInit(), which is also the buffer that out() uses to write from.
1138  The length written by out() will be at most the window size. Any non-zero
1139  amount of input may be provided by in().
1140 
1141  For convenience, inflateBack() can be provided input on the first call by
1142  setting strm->next_in and strm->avail_in. If that input is exhausted, then
1143  in() will be called. Therefore strm->next_in must be initialized before
1144  calling inflateBack(). If strm->next_in is Z_NULL, then in() will be called
1145  immediately for input. If strm->next_in is not Z_NULL, then strm->avail_in
1146  must also be initialized, and then if strm->avail_in is not zero, input will
1147  initially be taken from strm->next_in[0 .. strm->avail_in - 1].
1148 
1149  The in_desc and out_desc parameters of inflateBack() is passed as the
1150  first parameter of in() and out() respectively when they are called. These
1151  descriptors can be optionally used to pass any information that the caller-
1152  supplied in() and out() functions need to do their job.
1153 
1154  On return, inflateBack() will set strm->next_in and strm->avail_in to
1155  pass back any unused input that was provided by the last in() call. The
1156  return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR
1157  if in() or out() returned an error, Z_DATA_ERROR if there was a format error
1158  in the deflate stream (in which case strm->msg is set to indicate the nature
1159  of the error), or Z_STREAM_ERROR if the stream was not properly initialized.
1160  In the case of Z_BUF_ERROR, an input or output error can be distinguished
1161  using strm->next_in which will be Z_NULL only if in() returned an error. If
1162  strm->next_in is not Z_NULL, then the Z_BUF_ERROR was due to out() returning
1163  non-zero. (in() will always be called before out(), so strm->next_in is
1164  assured to be defined if out() returns non-zero.) Note that inflateBack()
1165  cannot return Z_OK.
1166 */
1167 
1169 /*
1170  All memory allocated by inflateBackInit() is freed.
1171 
1172  inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream
1173  state was inconsistent.
1174 */
1175 
1177 /* Return flags indicating compile-time options.
1178 
1179  Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other:
1180  1.0: size of uInt
1181  3.2: size of uLong
1182  5.4: size of voidpf (pointer)
1183  7.6: size of z_off_t
1184 
1185  Compiler, assembler, and debug options:
1186  8: ZLIB_DEBUG
1187  9: ASMV or ASMINF -- use ASM code
1188  10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention
1189  11: 0 (reserved)
1190 
1191  One-time table building (smaller code, but not thread-safe if true):
1192  12: BUILDFIXED -- build static block decoding tables when needed
1193  13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed
1194  14,15: 0 (reserved)
1195 
1196  Library content (indicates missing functionality):
1197  16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking
1198  deflate code when not needed)
1199  17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect
1200  and decode gzip streams (to avoid linking crc code)
1201  18-19: 0 (reserved)
1202 
1203  Operation variations (changes in library functionality):
1204  20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate
1205  21: FASTEST -- deflate algorithm with only one, lowest compression level
1206  22,23: 0 (reserved)
1207 
1208  The sprintf variant used by gzprintf (zero is best):
1209  24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format
1210  25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure!
1211  26: 0 = returns value, 1 = void -- 1 means inferred string length returned
1212 
1213  Remainder:
1214  27-31: 0 (reserved)
1215  */
1216 
1217 #ifndef Z_SOLO
1218 
1219  /* utility functions */
1220 
1221 /*
1222  The following utility functions are implemented on top of the basic
1223  stream-oriented functions. To simplify the interface, some default options
1224  are assumed (compression level and memory usage, standard memory allocation
1225  functions). The source code of these utility functions can be modified if
1226  you need special options.
1227 */
1228 
1229 ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen,
1230  const Bytef *source, uLong sourceLen));
1231 /*
1232  Compresses the source buffer into the destination buffer. sourceLen is
1233  the byte length of the source buffer. Upon entry, destLen is the total size
1234  of the destination buffer, which must be at least the value returned by
1235  compressBound(sourceLen). Upon exit, destLen is the actual size of the
1236  compressed data. compress() is equivalent to compress2() with a level
1237  parameter of Z_DEFAULT_COMPRESSION.
1238 
1239  compress returns Z_OK if success, Z_MEM_ERROR if there was not
1240  enough memory, Z_BUF_ERROR if there was not enough room in the output
1241  buffer.
1242 */
1243 
1244 ZEXTERN int ZEXPORT compress2 OF((Bytef *dest, uLongf *destLen,
1245  const Bytef *source, uLong sourceLen,
1246  int level));
1247 /*
1248  Compresses the source buffer into the destination buffer. The level
1249  parameter has the same meaning as in deflateInit. sourceLen is the byte
1250  length of the source buffer. Upon entry, destLen is the total size of the
1251  destination buffer, which must be at least the value returned by
1252  compressBound(sourceLen). Upon exit, destLen is the actual size of the
1253  compressed data.
1254 
1255  compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
1256  memory, Z_BUF_ERROR if there was not enough room in the output buffer,
1257  Z_STREAM_ERROR if the level parameter is invalid.
1258 */
1259 
1260 ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen));
1261 /*
1262  compressBound() returns an upper bound on the compressed size after
1263  compress() or compress2() on sourceLen bytes. It would be used before a
1264  compress() or compress2() call to allocate the destination buffer.
1265 */
1266 
1267 ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen,
1268  const Bytef *source, uLong sourceLen));
1269 /*
1270  Decompresses the source buffer into the destination buffer. sourceLen is
1271  the byte length of the source buffer. Upon entry, destLen is the total size
1272  of the destination buffer, which must be large enough to hold the entire
1273  uncompressed data. (The size of the uncompressed data must have been saved
1274  previously by the compressor and transmitted to the decompressor by some
1275  mechanism outside the scope of this compression library.) Upon exit, destLen
1276  is the actual size of the uncompressed data.
1277 
1278  uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
1279  enough memory, Z_BUF_ERROR if there was not enough room in the output
1280  buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete. In
1281  the case where there is not enough room, uncompress() will fill the output
1282  buffer with the uncompressed data up to that point.
1283 */
1284 
1285 ZEXTERN int ZEXPORT uncompress2 OF((Bytef *dest, uLongf *destLen,
1286  const Bytef *source, uLong *sourceLen));
1287 /*
1288  Same as uncompress, except that sourceLen is a pointer, where the
1289  length of the source is *sourceLen. On return, *sourceLen is the number of
1290  source bytes consumed.
1291 */
1292 
1293  /* gzip file access functions */
1294 
1295 /*
1296  This library supports reading and writing files in gzip (.gz) format with
1297  an interface similar to that of stdio, using the functions that start with
1298  "gz". The gzip format is different from the zlib format. gzip is a gzip
1299  wrapper, documented in RFC 1952, wrapped around a deflate stream.
1300 */
1301 
1302 typedef struct gzFile_s *gzFile; /* semi-opaque gzip file descriptor */
1303 
1304 /*
1305 ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode));
1306 
1307  Open the gzip (.gz) file at path for reading and decompressing, or
1308  compressing and writing. The mode parameter is as in fopen ("rb" or "wb")
1309  but can also include a compression level ("wb9") or a strategy: 'f' for
1310  filtered data as in "wb6f", 'h' for Huffman-only compression as in "wb1h",
1311  'R' for run-length encoding as in "wb1R", or 'F' for fixed code compression
1312  as in "wb9F". (See the description of deflateInit2 for more information
1313  about the strategy parameter.) 'T' will request transparent writing or
1314  appending with no compression and not using the gzip format.
1315 
1316  "a" can be used instead of "w" to request that the gzip stream that will
1317  be written be appended to the file. "+" will result in an error, since
1318  reading and writing to the same gzip file is not supported. The addition of
1319  "x" when writing will create the file exclusively, which fails if the file
1320  already exists. On systems that support it, the addition of "e" when
1321  reading or writing will set the flag to close the file on an execve() call.
1322 
1323  These functions, as well as gzip, will read and decode a sequence of gzip
1324  streams in a file. The append function of gzopen() can be used to create
1325  such a file. (Also see gzflush() for another way to do this.) When
1326  appending, gzopen does not test whether the file begins with a gzip stream,
1327  nor does it look for the end of the gzip streams to begin appending. gzopen
1328  will simply append a gzip stream to the existing file.
1329 
1330  gzopen can be used to read a file which is not in gzip format; in this
1331  case gzread will directly read from the file without decompression. When
1332  reading, this will be detected automatically by looking for the magic two-
1333  byte gzip header.
1334 
1335  gzopen returns NULL if the file could not be opened, if there was
1336  insufficient memory to allocate the gzFile state, or if an invalid mode was
1337  specified (an 'r', 'w', or 'a' was not provided, or '+' was provided).
1338  errno can be checked to determine if the reason gzopen failed was that the
1339  file could not be opened.
1340 */
1341 
1342 ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode));
1343 /*
1344  Associate a gzFile with the file descriptor fd. File descriptors are
1345  obtained from calls like open, dup, creat, pipe or fileno (if the file has
1346  been previously opened with fopen). The mode parameter is as in gzopen.
1347 
1348  The next call of gzclose on the returned gzFile will also close the file
1349  descriptor fd, just like fclose(fdopen(fd, mode)) closes the file descriptor
1350  fd. If you want to keep fd open, use fd = dup(fd_keep); gz = gzdopen(fd,
1351  mode);. The duplicated descriptor should be saved to avoid a leak, since
1352  gzdopen does not close fd if it fails. If you are using fileno() to get the
1353  file descriptor from a FILE *, then you will have to use dup() to avoid
1354  double-close()ing the file descriptor. Both gzclose() and fclose() will
1355  close the associated file descriptor, so they need to have different file
1356  descriptors.
1357 
1358  gzdopen returns NULL if there was insufficient memory to allocate the
1359  gzFile state, if an invalid mode was specified (an 'r', 'w', or 'a' was not
1360  provided, or '+' was provided), or if fd is -1. The file descriptor is not
1361  used until the next gz* read, write, seek, or close operation, so gzdopen
1362  will not detect if fd is invalid (unless fd is -1).
1363 */
1364 
1365 ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size));
1366 /*
1367  Set the internal buffer size used by this library's functions for file to
1368  size. The default buffer size is 8192 bytes. This function must be called
1369  after gzopen() or gzdopen(), and before any other calls that read or write
1370  the file. The buffer memory allocation is always deferred to the first read
1371  or write. Three times that size in buffer space is allocated. A larger
1372  buffer size of, for example, 64K or 128K bytes will noticeably increase the
1373  speed of decompression (reading).
1374 
1375  The new buffer size also affects the maximum length for gzprintf().
1376 
1377  gzbuffer() returns 0 on success, or -1 on failure, such as being called
1378  too late.
1379 */
1380 
1381 ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy));
1382 /*
1383  Dynamically update the compression level and strategy for file. See the
1384  description of deflateInit2 for the meaning of these parameters. Previously
1385  provided data is flushed before applying the parameter changes.
1386 
1387  gzsetparams returns Z_OK if success, Z_STREAM_ERROR if the file was not
1388  opened for writing, Z_ERRNO if there is an error writing the flushed data,
1389  or Z_MEM_ERROR if there is a memory allocation error.
1390 */
1391 
1392 ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len));
1393 /*
1394  Read and decompress up to len uncompressed bytes from file into buf. If
1395  the input file is not in gzip format, gzread copies the given number of
1396  bytes into the buffer directly from the file.
1397 
1398  After reaching the end of a gzip stream in the input, gzread will continue
1399  to read, looking for another gzip stream. Any number of gzip streams may be
1400  concatenated in the input file, and will all be decompressed by gzread().
1401  If something other than a gzip stream is encountered after a gzip stream,
1402  that remaining trailing garbage is ignored (and no error is returned).
1403 
1404  gzread can be used to read a gzip file that is being concurrently written.
1405  Upon reaching the end of the input, gzread will return with the available
1406  data. If the error code returned by gzerror is Z_OK or Z_BUF_ERROR, then
1407  gzclearerr can be used to clear the end of file indicator in order to permit
1408  gzread to be tried again. Z_OK indicates that a gzip stream was completed
1409  on the last gzread. Z_BUF_ERROR indicates that the input file ended in the
1410  middle of a gzip stream. Note that gzread does not return -1 in the event
1411  of an incomplete gzip stream. This error is deferred until gzclose(), which
1412  will return Z_BUF_ERROR if the last gzread ended in the middle of a gzip
1413  stream. Alternatively, gzerror can be used before gzclose to detect this
1414  case.
1415 
1416  gzread returns the number of uncompressed bytes actually read, less than
1417  len for end of file, or -1 for error. If len is too large to fit in an int,
1418  then nothing is read, -1 is returned, and the error state is set to
1419  Z_STREAM_ERROR.
1420 */
1421 
1423  gzFile file));
1424 /*
1425  Read and decompress up to nitems items of size size from file into buf,
1426  otherwise operating as gzread() does. This duplicates the interface of
1427  stdio's fread(), with size_t request and return types. If the library
1428  defines size_t, then z_size_t is identical to size_t. If not, then z_size_t
1429  is an unsigned integer type that can contain a pointer.
1430 
1431  gzfread() returns the number of full items read of size size, or zero if
1432  the end of the file was reached and a full item could not be read, or if
1433  there was an error. gzerror() must be consulted if zero is returned in
1434  order to determine if there was an error. If the multiplication of size and
1435  nitems overflows, i.e. the product does not fit in a z_size_t, then nothing
1436  is read, zero is returned, and the error state is set to Z_STREAM_ERROR.
1437 
1438  In the event that the end of file is reached and only a partial item is
1439  available at the end, i.e. the remaining uncompressed data length is not a
1440  multiple of size, then the final partial item is nevetheless read into buf
1441  and the end-of-file flag is set. The length of the partial item read is not
1442  provided, but could be inferred from the result of gztell(). This behavior
1443  is the same as the behavior of fread() implementations in common libraries,
1444  but it prevents the direct use of gzfread() to read a concurrently written
1445  file, reseting and retrying on end-of-file, when size is not 1.
1446 */
1447 
1448 ZEXTERN int ZEXPORT gzwrite OF((gzFile file, voidpc buf, unsigned len));
1449 /*
1450  Compress and write the len uncompressed bytes at buf to file. gzwrite
1451  returns the number of uncompressed bytes written or 0 in case of error.
1452 */
1453 
1455  z_size_t nitems, gzFile file));
1456 /*
1457  Compress and write nitems items of size size from buf to file, duplicating
1458  the interface of stdio's fwrite(), with size_t request and return types. If
1459  the library defines size_t, then z_size_t is identical to size_t. If not,
1460  then z_size_t is an unsigned integer type that can contain a pointer.
1461 
1462  gzfwrite() returns the number of full items written of size size, or zero
1463  if there was an error. If the multiplication of size and nitems overflows,
1464  i.e. the product does not fit in a z_size_t, then nothing is written, zero
1465  is returned, and the error state is set to Z_STREAM_ERROR.
1466 */
1467 
1468 ZEXTERN int ZEXPORTVA gzprintf Z_ARG((gzFile file, const char *format, ...));
1469 /*
1470  Convert, format, compress, and write the arguments (...) to file under
1471  control of the string format, as in fprintf. gzprintf returns the number of
1472  uncompressed bytes actually written, or a negative zlib error code in case
1473  of error. The number of uncompressed bytes written is limited to 8191, or
1474  one less than the buffer size given to gzbuffer(). The caller should assure
1475  that this limit is not exceeded. If it is exceeded, then gzprintf() will
1476  return an error (0) with nothing written. In this case, there may also be a
1477  buffer overflow with unpredictable consequences, which is possible only if
1478  zlib was compiled with the insecure functions sprintf() or vsprintf(),
1479  because the secure snprintf() or vsnprintf() functions were not available.
1480  This can be determined using zlibCompileFlags().
1481 */
1482 
1483 ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s));
1484 /*
1485  Compress and write the given null-terminated string s to file, excluding
1486  the terminating null character.
1487 
1488  gzputs returns the number of characters written, or -1 in case of error.
1489 */
1490 
1491 ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len));
1492 /*
1493  Read and decompress bytes from file into buf, until len-1 characters are
1494  read, or until a newline character is read and transferred to buf, or an
1495  end-of-file condition is encountered. If any characters are read or if len
1496  is one, the string is terminated with a null character. If no characters
1497  are read due to an end-of-file or len is less than one, then the buffer is
1498  left untouched.
1499 
1500  gzgets returns buf which is a null-terminated string, or it returns NULL
1501  for end-of-file or in case of error. If there was an error, the contents at
1502  buf are indeterminate.
1503 */
1504 
1505 ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c));
1506 /*
1507  Compress and write c, converted to an unsigned char, into file. gzputc
1508  returns the value that was written, or -1 in case of error.
1509 */
1510 
1512 /*
1513  Read and decompress one byte from file. gzgetc returns this byte or -1
1514  in case of end of file or error. This is implemented as a macro for speed.
1515  As such, it does not do all of the checking the other functions do. I.e.
1516  it does not check to see if file is NULL, nor whether the structure file
1517  points to has been clobbered or not.
1518 */
1519 
1520 ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file));
1521 /*
1522  Push c back onto the stream for file to be read as the first character on
1523  the next read. At least one character of push-back is always allowed.
1524  gzungetc() returns the character pushed, or -1 on failure. gzungetc() will
1525  fail if c is -1, and may fail if a character has been pushed but not read
1526  yet. If gzungetc is used immediately after gzopen or gzdopen, at least the
1527  output buffer size of pushed characters is allowed. (See gzbuffer above.)
1528  The pushed character will be discarded if the stream is repositioned with
1529  gzseek() or gzrewind().
1530 */
1531 
1532 ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush));
1533 /*
1534  Flush all pending output to file. The parameter flush is as in the
1535  deflate() function. The return value is the zlib error number (see function
1536  gzerror below). gzflush is only permitted when writing.
1537 
1538  If the flush parameter is Z_FINISH, the remaining data is written and the
1539  gzip stream is completed in the output. If gzwrite() is called again, a new
1540  gzip stream will be started in the output. gzread() is able to read such
1541  concatenated gzip streams.
1542 
1543  gzflush should be called only when strictly necessary because it will
1544  degrade compression if called too often.
1545 */
1546 
1547 /*
1548 ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file,
1549  z_off_t offset, int whence));
1550 
1551  Set the starting position to offset relative to whence for the next gzread
1552  or gzwrite on file. The offset represents a number of bytes in the
1553  uncompressed data stream. The whence parameter is defined as in lseek(2);
1554  the value SEEK_END is not supported.
1555 
1556  If the file is opened for reading, this function is emulated but can be
1557  extremely slow. If the file is opened for writing, only forward seeks are
1558  supported; gzseek then compresses a sequence of zeroes up to the new
1559  starting position.
1560 
1561  gzseek returns the resulting offset location as measured in bytes from
1562  the beginning of the uncompressed stream, or -1 in case of error, in
1563  particular if the file is opened for writing and the new starting position
1564  would be before the current position.
1565 */
1566 
1568 /*
1569  Rewind file. This function is supported only for reading.
1570 
1571  gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET).
1572 */
1573 
1574 /*
1575 ZEXTERN z_off_t ZEXPORT gztell OF((gzFile file));
1576 
1577  Return the starting position for the next gzread or gzwrite on file.
1578  This position represents a number of bytes in the uncompressed data stream,
1579  and is zero when starting, even if appending or reading a gzip stream from
1580  the middle of a file using gzdopen().
1581 
1582  gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR)
1583 */
1584 
1585 /*
1586 ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile file));
1587 
1588  Return the current compressed (actual) read or write offset of file. This
1589  offset includes the count of bytes that precede the gzip stream, for example
1590  when appending or when using gzdopen() for reading. When reading, the
1591  offset does not include as yet unused buffered input. This information can
1592  be used for a progress indicator. On error, gzoffset() returns -1.
1593 */
1594 
1596 /*
1597  Return true (1) if the end-of-file indicator for file has been set while
1598  reading, false (0) otherwise. Note that the end-of-file indicator is set
1599  only if the read tried to go past the end of the input, but came up short.
1600  Therefore, just like feof(), gzeof() may return false even if there is no
1601  more data to read, in the event that the last read request was for the exact
1602  number of bytes remaining in the input file. This will happen if the input
1603  file size is an exact multiple of the buffer size.
1604 
1605  If gzeof() returns true, then the read functions will return no more data,
1606  unless the end-of-file indicator is reset by gzclearerr() and the input file
1607  has grown since the previous end of file was detected.
1608 */
1609 
1611 /*
1612  Return true (1) if file is being copied directly while reading, or false
1613  (0) if file is a gzip stream being decompressed.
1614 
1615  If the input file is empty, gzdirect() will return true, since the input
1616  does not contain a gzip stream.
1617 
1618  If gzdirect() is used immediately after gzopen() or gzdopen() it will
1619  cause buffers to be allocated to allow reading the file to determine if it
1620  is a gzip file. Therefore if gzbuffer() is used, it should be called before
1621  gzdirect().
1622 
1623  When writing, gzdirect() returns true (1) if transparent writing was
1624  requested ("wT" for the gzopen() mode), or false (0) otherwise. (Note:
1625  gzdirect() is not needed when writing. Transparent writing must be
1626  explicitly requested, so the application already knows the answer. When
1627  linking statically, using gzdirect() will include all of the zlib code for
1628  gzip file reading and decompression, which may not be desired.)
1629 */
1630 
1632 /*
1633  Flush all pending output for file, if necessary, close file and
1634  deallocate the (de)compression state. Note that once file is closed, you
1635  cannot call gzerror with file, since its structures have been deallocated.
1636  gzclose must not be called more than once on the same file, just as free
1637  must not be called more than once on the same allocation.
1638 
1639  gzclose will return Z_STREAM_ERROR if file is not valid, Z_ERRNO on a
1640  file operation error, Z_MEM_ERROR if out of memory, Z_BUF_ERROR if the
1641  last read ended in the middle of a gzip stream, or Z_OK on success.
1642 */
1643 
1646 /*
1647  Same as gzclose(), but gzclose_r() is only for use when reading, and
1648  gzclose_w() is only for use when writing or appending. The advantage to
1649  using these instead of gzclose() is that they avoid linking in zlib
1650  compression or decompression code that is not used when only reading or only
1651  writing respectively. If gzclose() is used, then both compression and
1652  decompression code will be included the application when linking to a static
1653  zlib library.
1654 */
1655 
1656 ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum));
1657 /*
1658  Return the error message for the last error which occurred on file.
1659  errnum is set to zlib error number. If an error occurred in the file system
1660  and not in the compression library, errnum is set to Z_ERRNO and the
1661  application may consult errno to get the exact error code.
1662 
1663  The application must not modify the returned string. Future calls to
1664  this function may invalidate the previously returned string. If file is
1665  closed, then the string previously returned by gzerror will no longer be
1666  available.
1667 
1668  gzerror() should be used to distinguish errors from end-of-file for those
1669  functions above that do not distinguish those cases in their return values.
1670 */
1671 
1673 /*
1674  Clear the error and end-of-file flags for file. This is analogous to the
1675  clearerr() function in stdio. This is useful for continuing to read a gzip
1676  file that is being written concurrently.
1677 */
1678 
1679 #endif /* !Z_SOLO */
1680 
1681  /* checksum functions */
1682 
1683 /*
1684  These functions are not related to compression but are exported
1685  anyway because they might be useful in applications using the compression
1686  library.
1687 */
1688 
1689 ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
1690 /*
1691  Update a running Adler-32 checksum with the bytes buf[0..len-1] and
1692  return the updated checksum. An Adler-32 value is in the range of a 32-bit
1693  unsigned integer. If buf is Z_NULL, this function returns the required
1694  initial value for the checksum.
1695 
1696  An Adler-32 checksum is almost as reliable as a CRC-32 but can be computed
1697  much faster.
1698 
1699  Usage example:
1700 
1701  uLong adler = adler32(0L, Z_NULL, 0);
1702 
1703  while (read_buffer(buffer, length) != EOF) {
1704  adler = adler32(adler, buffer, length);
1705  }
1706  if (adler != original_adler) error();
1707 */
1708 
1709 ZEXTERN uLong ZEXPORT adler32_z OF((uLong adler, const Bytef *buf,
1710  z_size_t len));
1711 /*
1712  Same as adler32(), but with a size_t length.
1713 */
1714 
1715 /*
1716 ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2,
1717  z_off_t len2));
1718 
1719  Combine two Adler-32 checksums into one. For two sequences of bytes, seq1
1720  and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for
1721  each, adler1 and adler2. adler32_combine() returns the Adler-32 checksum of
1722  seq1 and seq2 concatenated, requiring only adler1, adler2, and len2. Note
1723  that the z_off_t type (like off_t) is a signed integer. If len2 is
1724  negative, the result has no meaning or utility.
1725 */
1726 
1727 ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len));
1728 /*
1729  Update a running CRC-32 with the bytes buf[0..len-1] and return the
1730  updated CRC-32. A CRC-32 value is in the range of a 32-bit unsigned integer.
1731  If buf is Z_NULL, this function returns the required initial value for the
1732  crc. Pre- and post-conditioning (one's complement) is performed within this
1733  function so it shouldn't be done by the application.
1734 
1735  Usage example:
1736 
1737  uLong crc = crc32(0L, Z_NULL, 0);
1738 
1739  while (read_buffer(buffer, length) != EOF) {
1740  crc = crc32(crc, buffer, length);
1741  }
1742  if (crc != original_crc) error();
1743 */
1744 
1745 ZEXTERN uLong ZEXPORT crc32_z OF((uLong crc, const Bytef *buf,
1746  z_size_t len));
1747 /*
1748  Same as crc32(), but with a size_t length.
1749 */
1750 
1751 /*
1752 ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2));
1753 
1754  Combine two CRC-32 check values into one. For two sequences of bytes,
1755  seq1 and seq2 with lengths len1 and len2, CRC-32 check values were
1756  calculated for each, crc1 and crc2. crc32_combine() returns the CRC-32
1757  check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and
1758  len2.
1759 */
1760 
1761 /*
1762 ZEXTERN uLong ZEXPORT crc32_combine_gen OF((z_off_t len2));
1763 
1764  Return the operator corresponding to length len2, to be used with
1765  crc32_combine_op().
1766 */
1767 
1769 /*
1770  Give the same result as crc32_combine(), using op in place of len2. op is
1771  is generated from len2 by crc32_combine_gen(). This will be faster than
1772  crc32_combine() if the generated op is used more than once.
1773 */
1774 
1775 
1776  /* various hacks, don't look :) */
1777 
1778 /* deflateInit and inflateInit are macros to allow checking the zlib version
1779  * and the compiler's view of z_stream:
1780  */
1781 ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level,
1782  const char *version, int stream_size));
1784  const char *version, int stream_size));
1785 ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int level, int method,
1786  int windowBits, int memLevel,
1787  int strategy, const char *version,
1788  int stream_size));
1790  const char *version, int stream_size));
1792  unsigned char FAR *window,
1793  const char *version,
1794  int stream_size));
1795 #ifdef Z_PREFIX_SET
1796 # define z_deflateInit(strm, level) \
1797  deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream))
1798 # define z_inflateInit(strm) \
1799  inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream))
1800 # define z_deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
1801  deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
1802  (strategy), ZLIB_VERSION, (int)sizeof(z_stream))
1803 # define z_inflateInit2(strm, windowBits) \
1804  inflateInit2_((strm), (windowBits), ZLIB_VERSION, \
1805  (int)sizeof(z_stream))
1806 # define z_inflateBackInit(strm, windowBits, window) \
1807  inflateBackInit_((strm), (windowBits), (window), \
1808  ZLIB_VERSION, (int)sizeof(z_stream))
1809 #else
1810 # define deflateInit(strm, level) \
1811  deflateInit_((strm), (level), ZLIB_VERSION, (int)sizeof(z_stream))
1812 # define inflateInit(strm) \
1813  inflateInit_((strm), ZLIB_VERSION, (int)sizeof(z_stream))
1814 # define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
1815  deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
1816  (strategy), ZLIB_VERSION, (int)sizeof(z_stream))
1817 # define inflateInit2(strm, windowBits) \
1818  inflateInit2_((strm), (windowBits), ZLIB_VERSION, \
1819  (int)sizeof(z_stream))
1820 # define inflateBackInit(strm, windowBits, window) \
1821  inflateBackInit_((strm), (windowBits), (window), \
1822  ZLIB_VERSION, (int)sizeof(z_stream))
1823 #endif
1824 
1825 #ifndef Z_SOLO
1826 
1827 /* gzgetc() macro and its supporting function and exposed data structure. Note
1828  * that the real internal state is much larger than the exposed structure.
1829  * This abbreviated structure exposes just enough for the gzgetc() macro. The
1830  * user should not mess with these exposed elements, since their names or
1831  * behavior could change in the future, perhaps even capriciously. They can
1832  * only be used by the gzgetc() macro. You have been warned.
1833  */
1834 struct gzFile_s {
1835  unsigned have;
1836  unsigned char *next;
1838 };
1839 ZEXTERN int ZEXPORT gzgetc_ OF((gzFile file)); /* backward compatibility */
1840 #ifdef Z_PREFIX_SET
1841 # undef z_gzgetc
1842 # define z_gzgetc(g) \
1843  ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g))
1844 #else
1845 # define gzgetc(g) \
1846  ((g)->have ? ((g)->have--, (g)->pos++, *((g)->next)++) : (gzgetc)(g))
1847 #endif
1848 
1849 /* provide 64-bit offset functions if _LARGEFILE64_SOURCE defined, and/or
1850  * change the regular functions to 64 bits if _FILE_OFFSET_BITS is 64 (if
1851  * both are true, the application gets the *64 functions, and the regular
1852  * functions are changed to 64 bits) -- in case these are set on systems
1853  * without large file support, _LFS64_LARGEFILE must also be true
1854  */
1855 #ifdef Z_LARGE64
1856  ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
1863 #endif
1864 
1865 #if !defined(ZLIB_INTERNAL) && defined(Z_WANT64)
1866 # ifdef Z_PREFIX_SET
1867 # define z_gzopen z_gzopen64
1868 # define z_gzseek z_gzseek64
1869 # define z_gztell z_gztell64
1870 # define z_gzoffset z_gzoffset64
1871 # define z_adler32_combine z_adler32_combine64
1872 # define z_crc32_combine z_crc32_combine64
1873 # define z_crc32_combine_gen z_crc32_combine_gen64
1874 # else
1875 # define gzopen gzopen64
1876 # define gzseek gzseek64
1877 # define gztell gztell64
1878 # define gzoffset gzoffset64
1879 # define adler32_combine adler32_combine64
1880 # define crc32_combine crc32_combine64
1881 # define crc32_combine_gen crc32_combine_gen64
1882 # endif
1883 # ifndef Z_LARGE64
1884  ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
1891 # endif
1892 #else
1893  ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *));
1900 #endif
1901 
1902 #else /* Z_SOLO */
1903 
1907 
1908 #endif /* !Z_SOLO */
1909 
1910 /* undocumented functions */
1911 ZEXTERN const char * ZEXPORT zError OF((int));
1913 ZEXTERN const z_crc_t FAR * ZEXPORT get_crc_table OF((void));
1916 ZEXTERN unsigned long ZEXPORT inflateCodesUsed OF ((z_streamp));
1919 #if defined(_WIN32) && !defined(Z_SOLO)
1920 ZEXTERN gzFile ZEXPORT gzopen_w OF((const wchar_t *path,
1921  const char *mode));
1922 #endif
1923 #if defined(STDC) || defined(Z_HAVE_STDARG_H)
1924 # ifndef Z_SOLO
1925 ZEXTERN int ZEXPORTVA gzvprintf Z_ARG((gzFile file,
1926  const char *format,
1927  va_list va));
1928 # endif
1929 #endif
1930 
1931 #ifdef __cplusplus
1932 }
1933 #endif
1934 
1935 #endif /* ZLIB_H */
unsigned long z_size_t
Definition: zconf.h:250
int xflags
Definition: zlib.h:89
unsigned long z_crc_t
Definition: zconf.h:431
int ZEXPORT deflateGetDictionary(z_streamp strm, Bytef *dictionary, uInt *dictLength)
Definition: deflate.c:485
int ZEXPORT gzdirect(gzFile file)
Definition: gzread.c:605
GLint level
Definition: gl.h:1546
int inflateEnd(z_streamp strm) DECLSPEC_HIDDEN
Definition: inflate.c:1910
int ZEXPORT deflateParams(z_streamp strm, int level, int strategy)
Definition: deflate.c:609
Definition: pdh_main.c:93
int windowBits
Definition: zlib.h:813
struct png_info_def **typedef void(__cdecl typeof(png_destroy_read_struct))(struct png_struct_def **
Definition: typeof.h:49
int ZEXPORT inflateSetDictionary(z_streamp strm, const Bytef *dictionary, uInt dictLength)
Definition: inflate.c:1338
int text
Definition: zlib.h:87
int inflate(z_streamp strm, int flush) DECLSPEC_HIDDEN
Definition: inflate.c:1257
uLong ZEXPORT crc32_combine_gen(z_off_t len2)
Definition: crc32.c:1103
void FAR * voidpf
Definition: zlib.h:42
uLong ZEXPORT adler32_z(uLong adler, const Bytef *buf, z_size_t len)
Definition: adler32.c:63
const char *ZEXPORT zError(int err)
Definition: zutil.c:133
struct outqueuenode * head
Definition: adnsresfilter.c:66
int ZEXPORT uncompress(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen)
Definition: uncompr.c:86
z_stream FAR * z_streamp
Definition: zlib.h:80
int hcrc
Definition: zlib.h:98
ZEXTERN int ZEXPORTVA gzprintf Z_ARG((gzFile file, const char *format,...))
int ZEXPORT inflateBack(z_streamp strm, in_func in, void FAR *in_desc, out_func out, void FAR *out_desc)
Definition: infback.c:250
int ZEXPORT inflateGetDictionary(z_streamp strm, Bytef *dictionary, uInt *dictLength)
Definition: inflate.c:1315
uLong ZEXPORT crc32_combine64(uLong crc1, uLong crc2, z_off64_t len2)
Definition: crc32.c:1072
uLong time
Definition: zlib.h:88
int ZEXPORT gzeof(gzFile file)
Definition: gzlib.c:517
#define z_off_t
Definition: zconf.h:504
uInt avail_in
Definition: zlib.h:60
z_off64_t ZEXPORT gzoffset64(gzFile file)
Definition: gzlib.c:484
int ZEXPORT gzsetparams(gzFile file, int level, int strategy)
Definition: gzwrite.c:597
unsigned have
Definition: zlib.h:1835
uLong ZEXPORT adler32_combine64(uLong adler1, uLong adler2, z_off64_t len2)
Definition: adler32.c:180
int ZEXPORT gzclose(gzFile file)
Definition: gzclose.c:11
#define z_off64_t
Definition: zconf.h:513
static int fd
Definition: io.c:51
z_const char * msg
Definition: zlib.h:67
int ZEXPORT uncompress2(Bytef *dest, uLongf *destLen, const Bytef *source, uLong *sourceLen)
Definition: uncompr.c:27
z_off_t ZEXPORT gztell(gzFile file)
Definition: gzlib.c:474
int ZEXPORT inflateReset(z_streamp strm)
Definition: inflate.c:145
uInt extra_max
Definition: zlib.h:93
uInt name_max
Definition: zlib.h:95
int done
Definition: zlib.h:99
ZEXTERN(int) inflate OF((z_streamp strm
GLenum GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * bits
Definition: glext.h:10929
unsigned long ZEXPORT crc32_z(unsigned long crc, const unsigned char FAR *buf, z_size_t len)
Definition: crc32.c:739
int ZEXPORT deflateInit2_(z_streamp strm, int level, int method, int windowBits, int memLevel, int strategy, const char *version, int stream_size)
Definition: deflate.c:243
uLong ZEXPORT deflateBound(z_streamp strm, uLong sourceLen)
Definition: deflate.c:693
GLint GLint GLsizei GLsizei GLsizei GLint GLenum format
Definition: gl.h:1546
int ZEXPORT deflatePrime(z_streamp strm, int bits, int value)
Definition: deflate.c:582
unsigned long uLong
Definition: zlib.h:39
int ZEXPORT gzputs(gzFile file, const char *s)
Definition: gzwrite.c:361
int ZEXPORT inflateBackInit_(z_streamp strm, int windowBits, unsigned char FAR *window, const char *version, int stream_size)
Definition: infback.c:28
int ZEXPORT gzwrite(gzFile file, voidpc buf, unsigned len)
Definition: gzwrite.c:255
int const char * version
Definition: zlib.h:813
GLenum GLuint GLenum GLsizei const GLchar * buf
Definition: glext.h:7751
voidpf opaque
Definition: zlib.h:72
free_func zfree
Definition: zlib.h:71
int ZEXPORT gzgetc_(gzFile file)
Definition: gzread.c:474
int ZEXPORT gzputc(gzFile file, int c)
Definition: gzwrite.c:313
int ZEXPORT gzrewind(gzFile file)
Definition: gzlib.c:345
z_off64_t ZEXPORT gztell64(gzFile file)
Definition: gzlib.c:457
int ZEXPORT compress2(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int level)
Definition: compress.c:22
uLong reserved
Definition: zlib.h:77
int ZEXPORT gzungetc(int c, gzFile file)
Definition: gzread.c:481
z_off_t ZEXPORT gzseek(gzFile file, z_off_t offset, int whence)
Definition: gzlib.c:445
z_size_t ZEXPORT gzfwrite(voidpc buf, z_size_t size, z_size_t nitems, gzFile file)
Definition: gzwrite.c:283
uInt extra_len
Definition: zlib.h:92
char * va_list
Definition: acmsvcex.h:78
int deflateEnd(z_streamp strm) DECLSPEC_HIDDEN
Definition: deflate.c:1119
int ZEXPORT inflateInit_(z_streamp strm, const char *version, int stream_size)
Definition: inflate.c:240
Bytef * name
Definition: zlib.h:94
z_const Bytef * next_in
Definition: zlib.h:59
int data_type
Definition: zlib.h:74
int ZEXPORT inflateSync(z_streamp strm)
Definition: inflate.c:1424
int ZEXPORT deflateCopy(z_streamp dest, z_streamp source)
Definition: deflate.c:1145
int ZEXPORT deflateTune(z_streamp strm, int good_length, int max_lazy, int nice_length, int max_chain)
Definition: deflate.c:658
unsigned long ZEXPORT inflateCodesUsed(z_streamp strm)
Definition: inflate.c:1585
uLong ZEXPORT crc32_combine(uLong crc1, uLong crc2, z_off_t len2)
Definition: crc32.c:1084
int ZEXPORT gzbuffer(gzFile file, unsigned size)
Definition: gzlib.c:318
int flush
Definition: zlib.h:309
void(* free_func)(voidpf opaque, voidpf address)
Definition: zlib.h:54
GLsizeiptr size
Definition: glext.h:5919
int const char int stream_size
Definition: zlib.h:813
int ZEXPORT inflateCopy(z_streamp dest, z_streamp source)
Definition: inflate.c:1492
int os
Definition: zlib.h:90
uLong total_in
Definition: zlib.h:61
struct gz_header_s gz_header
uLong ZEXPORT compressBound(uLong sourceLen)
Definition: compress.c:81
int ZEXPORT compress(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen)
Definition: compress.c:68
int ZEXPORT gzclose_r(gzFile file)
Definition: gzread.c:625
int ZEXPORT inflatePrime(z_streamp strm, int bits, int value)
Definition: inflate.c:248
gzFile ZEXPORT gzdopen(int fd, const char *mode)
Definition: gzlib.c:288
struct z_stream_s z_stream
const GLubyte * c
Definition: glext.h:8905
Bytef * comment
Definition: zlib.h:96
alloc_func zalloc
Definition: zlib.h:70
static FILE * out
Definition: regtests2xml.c:44
GLuint address
Definition: glext.h:9393
UINT op
Definition: effect.c:236
int deflate(z_streamp strm, int flush) DECLSPEC_HIDDEN
Definition: deflate.c:804
int ZEXPORT inflateBackEnd(z_streamp strm)
Definition: infback.c:632
z_off64_t pos
Definition: zlib.h:1837
int ZEXPORT gzclose_w(gzFile file)
Definition: gzwrite.c:639
method
Definition: dragdrop.c:53
uLong ZEXPORT adler32_combine(uLong adler1, uLong adler2, z_off_t len2)
Definition: adler32.c:172
#define gzgetc(g)
Definition: zlib.h:1845
const char *ZEXPORT zlibVersion()
Definition: zutil.c:27
uLong crc32_combine_op(uLong crc1, uLong crc2, uLong op)
Definition: crc32.c:1110
Byte * voidp
Definition: zconf.h:414
int ZEXPORT inflateResetKeep(z_streamp strm)
Definition: inflate.c:119
const z_crc_t FAR *ZEXPORT get_crc_table()
Definition: crc32.c:586
z_size_t ZEXPORT gzfread(voidp buf, z_size_t size, z_size_t nitems, gzFile file)
Definition: gzread.c:411
GLenum GLsizei len
Definition: glext.h:6722
char *ZEXPORT gzgets(gzFile file, char *buf, int len)
Definition: gzread.c:541
GLdouble s
Definition: gl.h:2039
int ZEXPORTVA gzprintf(gzFile file, const char *format, int a1, int a2, int a3, int a4, int a5, int a6, int a7, int a8, int a9, int a10, int a11, int a12, int a13, int a14, int a15, int a16, int a17, int a18, int a19, int a20)
Definition: gzwrite.c:477
z_off_t ZEXPORT gzoffset(gzFile file)
Definition: gzlib.c:507
static IHTMLWindow2 * window
Definition: events.c:77
GLenum mode
Definition: glext.h:6217
uLong adler
Definition: zlib.h:76
int ZEXPORT inflateGetHeader(z_streamp strm, gz_headerp head)
Definition: inflate.c:1373
int ZEXPORT inflateReset2(z_streamp strm, int windowBits)
Definition: inflate.c:158
gz_header FAR * gz_headerp
Definition: zlib.h:103
uLong total_out
Definition: zlib.h:65
uLong ZEXPORT zlibCompileFlags()
Definition: zutil.c:32
uLong FAR uLongf
Definition: zconf.h:405
const char *ZEXPORT gzerror(gzFile file, int *errnum)
Definition: gzlib.c:534
unsigned int uInt
Definition: zlib.h:38
void ZEXPORT gzclearerr(gzFile file)
Definition: gzlib.c:555
GLuint in
Definition: glext.h:9616
int ZEXPORT gzflush(gzFile file, int flush)
Definition: gzwrite.c:565
gzFile ZEXPORT gzopen64(char *path, const char *mode) const
Definition: gzlib.c:280
uInt comm_max
Definition: zlib.h:97
int ZEXPORT deflateResetKeep(z_streamp strm)
Definition: deflate.c:507
unsigned char * next
Definition: zlib.h:1836
int ZEXPORT deflateSetDictionary(z_streamp strm, const Bytef *dictionary, uInt dictLength)
Definition: deflate.c:416
int ZEXPORT deflateSetHeader(z_streamp strm, gz_headerp head)
Definition: deflate.c:557
voidpf alloc_func OF((voidpf opaque, uInt items, uInt size))
Definition: zlib.h:81
uLong ZEXPORT crc32_combine_gen64(z_off64_t len2)
Definition: crc32.c:1093
uInt avail_out
Definition: zlib.h:64
struct gzFile_s * gzFile
Definition: zlib.h:1302
Byte FAR Bytef
Definition: zlib.h:41
int ZEXPORT inflateInit2_(z_streamp strm, int windowBits, const char *version, int stream_size)
Definition: inflate.c:196
gzFile ZEXPORT gzopen(char *path, const char *mode) const
Definition: gzlib.c:272
#define crc32(crc, buf, len)
Definition: inflate.c:1081
int ZEXPORT deflateInit_(z_streamp strm, int level, const char *version, int stream_size)
Definition: deflate.c:231
#define z_const
Definition: zlib.h:35
voidpf(* alloc_func)(voidpf opaque, uInt items, uInt size)
Definition: zlib.h:53
long ZEXPORT inflateMark(z_streamp strm)
Definition: inflate.c:1572
Bytef * extra
Definition: zlib.h:91
int ZEXPORT deflateReset(z_streamp strm)
Definition: deflate.c:545
int ZEXPORT deflatePending(z_streamp strm, unsigned *pending, int *bits)
Definition: deflate.c:568
Byte const * voidpc
Definition: zconf.h:412
static char * dest
Definition: rtl.c:135
struct internal_state FAR * state
Definition: zlib.h:68
#define FAR
Definition: zlib.h:34
int ZEXPORT inflateValidate(z_streamp strm, int check)
Definition: inflate.c:1557
int ZEXPORT gzread(gzFile file, voidp buf, unsigned len)
Definition: gzread.c:375
z_off64_t ZEXPORT gzseek64(gzFile file, z_off64_t offset, int whence)
Definition: gzlib.c:368
Bytef * next_out
Definition: zlib.h:63
static TCHAR * items[]
Definition: page1.c:45
#define ZEXPORT
Definition: zconf.h:380
uLong ZEXPORT adler32(uLong adler, const Bytef *buf, uInt len)
Definition: adler32.c:134
#define ZEXPORTVA
Definition: zconf.h:383
int ZEXPORT inflateSyncPoint(z_streamp strm)
Definition: inflate.c:1482
int ZEXPORT inflateUndermine(z_streamp strm, int subvert)
Definition: inflate.c:1539
static unsigned(__cdecl *hash_bstr)(bstr_t s)
unsigned int(__cdecl typeof(jpeg_read_scanlines))(struct jpeg_decompress_struct *
Definition: typeof.h:31
Definition: fci.c:126