source: rtems/cpukit/zlib/zlib.h @ 94a2ecc

4.11
Last change on this file since 94a2ecc was 94a2ecc, checked in by Ralf Corsepius <ralf.corsepius@…>, on Mar 18, 2011 at 10:11:35 AM

Import from zlib-1.2.4

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1/* zlib.h -- interface of the 'zlib' general purpose compression library
2  version 1.2.4, Mar 14th, 2010
3
4  Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler
5
6  This software is provided 'as-is', without any express or implied
7  warranty.  In no event will the authors be held liable for any damages
8  arising from the use of this software.
9
10  Permission is granted to anyone to use this software for any purpose,
11  including commercial applications, and to alter it and redistribute it
12  freely, subject to the following restrictions:
13
14  1. The origin of this software must not be misrepresented; you must not
15     claim that you wrote the original software. If you use this software
16     in a product, an acknowledgment in the product documentation would be
17     appreciated but is not required.
18  2. Altered source versions must be plainly marked as such, and must not be
19     misrepresented as being the original software.
20  3. This notice may not be removed or altered from any source distribution.
21
22  Jean-loup Gailly        Mark Adler
23  jloup@gzip.org          madler@alumni.caltech.edu
24
25
26  The data format used by the zlib library is described by RFCs (Request for
27  Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt
28  (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format).
29*/
30
31#ifndef ZLIB_H
32#define ZLIB_H
33
34#include "zconf.h"
35
36#ifdef __cplusplus
37extern "C" {
38#endif
39
40#define ZLIB_VERSION "1.2.4"
41#define ZLIB_VERNUM 0x1240
42#define ZLIB_VER_MAJOR 1
43#define ZLIB_VER_MINOR 2
44#define ZLIB_VER_REVISION 4
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 streams in memory as well.
69
70    The zlib format was designed to be compact and fast for use in memory
71  and on communications channels.  The gzip format was designed for single-
72  file compression on file systems, has a larger header than zlib to maintain
73  directory information, and uses a different, slower check method than zlib.
74
75    The library does not install any signal handler.  The decoder checks
76  the consistency of the compressed data, so the library should never crash
77  even in case of corrupted input.
78*/
79
80typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
81typedef void   (*free_func)  OF((voidpf opaque, voidpf address));
82
83struct internal_state;
84
85typedef struct z_stream_s {
86    Bytef    *next_in;  /* next input byte */
87    uInt     avail_in;  /* number of bytes available at next_in */
88    uLong    total_in;  /* total nb of input bytes read so far */
89
90    Bytef    *next_out; /* next output byte should be put there */
91    uInt     avail_out; /* remaining free space at next_out */
92    uLong    total_out; /* total nb of bytes output so far */
93
94    char     *msg;      /* last error message, NULL if no error */
95    struct internal_state FAR *state; /* not visible by applications */
96
97    alloc_func zalloc;  /* used to allocate the internal state */
98    free_func  zfree;   /* used to free the internal state */
99    voidpf     opaque;  /* private data object passed to zalloc and zfree */
100
101    int     data_type;  /* best guess about the data type: binary or text */
102    uLong   adler;      /* adler32 value of the uncompressed data */
103    uLong   reserved;   /* reserved for future use */
104} z_stream;
105
106typedef z_stream FAR *z_streamp;
107
108/*
109     gzip header information passed to and from zlib routines.  See RFC 1952
110  for more details on the meanings of these fields.
111*/
112typedef struct gz_header_s {
113    int     text;       /* true if compressed data believed to be text */
114    uLong   time;       /* modification time */
115    int     xflags;     /* extra flags (not used when writing a gzip file) */
116    int     os;         /* operating system */
117    Bytef   *extra;     /* pointer to extra field or Z_NULL if none */
118    uInt    extra_len;  /* extra field length (valid if extra != Z_NULL) */
119    uInt    extra_max;  /* space at extra (only when reading header) */
120    Bytef   *name;      /* pointer to zero-terminated file name or Z_NULL */
121    uInt    name_max;   /* space at name (only when reading header) */
122    Bytef   *comment;   /* pointer to zero-terminated comment or Z_NULL */
123    uInt    comm_max;   /* space at comment (only when reading header) */
124    int     hcrc;       /* true if there was or will be a header crc */
125    int     done;       /* true when done reading gzip header (not used
126                           when writing a gzip file) */
127} gz_header;
128
129typedef gz_header FAR *gz_headerp;
130
131/*
132     The application must update next_in and avail_in when avail_in has dropped
133   to zero.  It must update next_out and avail_out when avail_out has dropped
134   to zero.  The application must initialize zalloc, zfree and opaque before
135   calling the init function.  All other fields are set by the compression
136   library and must not be updated by the application.
137
138     The opaque value provided by the application will be passed as the first
139   parameter for calls of zalloc and zfree.  This can be useful for custom
140   memory management.  The compression library attaches no meaning to the
141   opaque value.
142
143     zalloc must return Z_NULL if there is not enough memory for the object.
144   If zlib is used in a multi-threaded application, zalloc and zfree must be
145   thread safe.
146
147     On 16-bit systems, the functions zalloc and zfree must be able to allocate
148   exactly 65536 bytes, but will not be required to allocate more than this if
149   the symbol MAXSEG_64K is defined (see zconf.h).  WARNING: On MSDOS, pointers
150   returned by zalloc for objects of exactly 65536 bytes *must* have their
151   offset normalized to zero.  The default allocation function provided by this
152   library ensures this (see zutil.c).  To reduce memory requirements and avoid
153   any allocation of 64K objects, at the expense of compression ratio, compile
154   the library with -DMAX_WBITS=14 (see zconf.h).
155
156     The fields total_in and total_out can be used for statistics or progress
157   reports.  After compression, total_in holds the total size of the
158   uncompressed data and may be saved for use in the decompressor (particularly
159   if the decompressor wants to decompress everything in a single step).
160*/
161
162                        /* constants */
163
164#define Z_NO_FLUSH      0
165#define Z_PARTIAL_FLUSH 1
166#define Z_SYNC_FLUSH    2
167#define Z_FULL_FLUSH    3
168#define Z_FINISH        4
169#define Z_BLOCK         5
170#define Z_TREES         6
171/* Allowed flush values; see deflate() and inflate() below for details */
172
173#define Z_OK            0
174#define Z_STREAM_END    1
175#define Z_NEED_DICT     2
176#define Z_ERRNO        (-1)
177#define Z_STREAM_ERROR (-2)
178#define Z_DATA_ERROR   (-3)
179#define Z_MEM_ERROR    (-4)
180#define Z_BUF_ERROR    (-5)
181#define Z_VERSION_ERROR (-6)
182/* Return codes for the compression/decompression functions. Negative values
183 * are errors, positive values are used for special but normal events.
184 */
185
186#define Z_NO_COMPRESSION         0
187#define Z_BEST_SPEED             1
188#define Z_BEST_COMPRESSION       9
189#define Z_DEFAULT_COMPRESSION  (-1)
190/* compression levels */
191
192#define Z_FILTERED            1
193#define Z_HUFFMAN_ONLY        2
194#define Z_RLE                 3
195#define Z_FIXED               4
196#define Z_DEFAULT_STRATEGY    0
197/* compression strategy; see deflateInit2() below for details */
198
199#define Z_BINARY   0
200#define Z_TEXT     1
201#define Z_ASCII    Z_TEXT   /* for compatibility with 1.2.2 and earlier */
202#define Z_UNKNOWN  2
203/* Possible values of the data_type field (though see inflate()) */
204
205#define Z_DEFLATED   8
206/* The deflate compression method (the only one supported in this version) */
207
208#define Z_NULL  0  /* for initializing zalloc, zfree, opaque */
209
210#define zlib_version zlibVersion()
211/* for compatibility with versions < 1.0.2 */
212
213
214                        /* basic functions */
215
216ZEXTERN const char * ZEXPORT zlibVersion OF((void));
217/* The application can compare zlibVersion and ZLIB_VERSION for consistency.
218   If the first character differs, the library code actually used is not
219   compatible with the zlib.h header file used by the application.  This check
220   is automatically made by deflateInit and inflateInit.
221 */
222
223/*
224ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level));
225
226     Initializes the internal stream state for compression.  The fields
227   zalloc, zfree and opaque must be initialized before by the caller.  If
228   zalloc and zfree are set to Z_NULL, deflateInit updates them to use default
229   allocation functions.
230
231     The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9:
232   1 gives best speed, 9 gives best compression, 0 gives no compression at all
233   (the input data is simply copied a block at a time).  Z_DEFAULT_COMPRESSION
234   requests a default compromise between speed and compression (currently
235   equivalent to level 6).
236
237     deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
238   memory, Z_STREAM_ERROR if level is not a valid compression level, or
239   Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible
240   with the version assumed by the caller (ZLIB_VERSION).  msg is set to null
241   if there is no error message.  deflateInit does not perform any compression:
242   this will be done by deflate().
243*/
244
245
246ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));
247/*
248    deflate compresses as much data as possible, and stops when the input
249  buffer becomes empty or the output buffer becomes full.  It may introduce
250  some output latency (reading input without producing any output) except when
251  forced to flush.
252
253    The detailed semantics are as follows.  deflate performs one or both of the
254  following actions:
255
256  - Compress more input starting at next_in and update next_in and avail_in
257    accordingly.  If not all input can be processed (because there is not
258    enough room in the output buffer), next_in and avail_in are updated and
259    processing will resume at this point for the next call of deflate().
260
261  - Provide more output starting at next_out and update next_out and avail_out
262    accordingly.  This action is forced if the parameter flush is non zero.
263    Forcing flush frequently degrades the compression ratio, so this parameter
264    should be set only when necessary (in interactive applications).  Some
265    output may be provided even if flush is not set.
266
267    Before the call of deflate(), the application should ensure that at least
268  one of the actions is possible, by providing more input and/or consuming more
269  output, and updating avail_in or avail_out accordingly; avail_out should
270  never be zero before the call.  The application can consume the compressed
271  output when it wants, for example when the output buffer is full (avail_out
272  == 0), or after each call of deflate().  If deflate returns Z_OK and with
273  zero avail_out, it must be called again after making room in the output
274  buffer because there might be more output pending.
275
276    Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to
277  decide how much data to accumulate before producing output, in order to
278  maximize compression.
279
280    If the parameter flush is set to Z_SYNC_FLUSH, all pending output is
281  flushed to the output buffer and the output is aligned on a byte boundary, so
282  that the decompressor can get all input data available so far.  (In
283  particular avail_in is zero after the call if enough output space has been
284  provided before the call.) Flushing may degrade compression for some
285  compression algorithms and so it should be used only when necessary.  This
286  completes the current deflate block and follows it with an empty stored block
287  that is three bits plus filler bits to the next byte, followed by four bytes
288  (00 00 ff ff).
289
290    If flush is set to Z_PARTIAL_FLUSH, all pending output is flushed to the
291  output buffer, but the output is not aligned to a byte boundary.  All of the
292  input data so far will be available to the decompressor, as for Z_SYNC_FLUSH.
293  This completes the current deflate block and follows it with an empty fixed
294  codes block that is 10 bits long.  This assures that enough bytes are output
295  in order for the decompressor to finish the block before the empty fixed code
296  block.
297
298    If flush is set to Z_BLOCK, a deflate block is completed and emitted, as
299  for Z_SYNC_FLUSH, but the output is not aligned on a byte boundary, and up to
300  seven bits of the current block are held to be written as the next byte after
301  the next deflate block is completed.  In this case, the decompressor may not
302  be provided enough bits at this point in order to complete decompression of
303  the data provided so far to the compressor.  It may need to wait for the next
304  block to be emitted.  This is for advanced applications that need to control
305  the emission of deflate blocks.
306
307    If flush is set to Z_FULL_FLUSH, all output is flushed as with
308  Z_SYNC_FLUSH, and the compression state is reset so that decompression can
309  restart from this point if previous compressed data has been damaged or if
310  random access is desired.  Using Z_FULL_FLUSH too often can seriously degrade
311  compression.
312
313    If deflate returns with avail_out == 0, this function must be called again
314  with the same value of the flush parameter and more output space (updated
315  avail_out), until the flush is complete (deflate returns with non-zero
316  avail_out).  In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that
317  avail_out is greater than six to avoid repeated flush markers due to
318  avail_out == 0 on return.
319
320    If the parameter flush is set to Z_FINISH, pending input is processed,
321  pending output is flushed and deflate returns with Z_STREAM_END if there was
322  enough output space; if deflate returns with Z_OK, this function must be
323  called again with Z_FINISH and more output space (updated avail_out) but no
324  more input data, until it returns with Z_STREAM_END or an error.  After
325  deflate has returned Z_STREAM_END, the only possible operations on the stream
326  are deflateReset or deflateEnd.
327
328    Z_FINISH can be used immediately after deflateInit if all the compression
329  is to be done in a single step.  In this case, avail_out must be at least the
330  value returned by deflateBound (see below).  If deflate does not return
331  Z_STREAM_END, then it must be called again as described above.
332
333    deflate() sets strm->adler to the adler32 checksum of all input read
334  so far (that is, total_in bytes).
335
336    deflate() may update strm->data_type if it can make a good guess about
337  the input data type (Z_BINARY or Z_TEXT).  In doubt, the data is considered
338  binary.  This field is only for information purposes and does not affect the
339  compression algorithm in any manner.
340
341    deflate() returns Z_OK if some progress has been made (more input
342  processed or more output produced), Z_STREAM_END if all input has been
343  consumed and all output has been produced (only when flush is set to
344  Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example
345  if next_in or next_out was Z_NULL), Z_BUF_ERROR if no progress is possible
346  (for example avail_in or avail_out was zero).  Note that Z_BUF_ERROR is not
347  fatal, and deflate() can be called again with more input and more output
348  space to continue compressing.
349*/
350
351
352ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm));
353/*
354     All dynamically allocated data structures for this stream are freed.
355   This function discards any unprocessed input and does not flush any pending
356   output.
357
358     deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the
359   stream state was inconsistent, Z_DATA_ERROR if the stream was freed
360   prematurely (some input or output was discarded).  In the error case, msg
361   may be set but then points to a static string (which must not be
362   deallocated).
363*/
364
365
366/*
367ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm));
368
369     Initializes the internal stream state for decompression.  The fields
370   next_in, avail_in, zalloc, zfree and opaque must be initialized before by
371   the caller.  If next_in is not Z_NULL and avail_in is large enough (the
372   exact value depends on the compression method), inflateInit determines the
373   compression method from the zlib header and allocates all data structures
374   accordingly; otherwise the allocation will be deferred to the first call of
375   inflate.  If zalloc and zfree are set to Z_NULL, inflateInit updates them to
376   use default allocation functions.
377
378     inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
379   memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
380   version assumed by the caller, or Z_STREAM_ERROR if the parameters are
381   invalid, such as a null pointer to the structure.  msg is set to null if
382   there is no error message.  inflateInit does not perform any decompression
383   apart from possibly reading the zlib header if present: actual decompression
384   will be done by inflate().  (So next_in and avail_in may be modified, but
385   next_out and avail_out are unused and unchanged.) The current implementation
386   of inflateInit() does not process any header information -- that is deferred
387   until inflate() is called.
388*/
389
390
391ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush));
392/*
393    inflate decompresses as much data as possible, and stops when the input
394  buffer becomes empty or the output buffer becomes full.  It may introduce
395  some output latency (reading input without producing any output) except when
396  forced to flush.
397
398  The detailed semantics are as follows.  inflate performs one or both of the
399  following actions:
400
401  - Decompress more input starting at next_in and update next_in and avail_in
402    accordingly.  If not all input can be processed (because there is not
403    enough room in the output buffer), next_in is updated and processing will
404    resume at this point for the next call of inflate().
405
406  - Provide more output starting at next_out and update next_out and avail_out
407    accordingly.  inflate() provides as much output as possible, until there is
408    no more input data or no more space in the output buffer (see below about
409    the flush parameter).
410
411    Before the call of inflate(), the application should ensure that at least
412  one of the actions is possible, by providing more input and/or consuming more
413  output, and updating the next_* and avail_* values accordingly.  The
414  application can consume the uncompressed output when it wants, for example
415  when the output buffer is full (avail_out == 0), or after each call of
416  inflate().  If inflate returns Z_OK and with zero avail_out, it must be
417  called again after making room in the output buffer because there might be
418  more output pending.
419
420    The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH, Z_FINISH,
421  Z_BLOCK, or Z_TREES.  Z_SYNC_FLUSH requests that inflate() flush as much
422  output as possible to the output buffer.  Z_BLOCK requests that inflate()
423  stop if and when it gets to the next deflate block boundary.  When decoding
424  the zlib or gzip format, this will cause inflate() to return immediately
425  after the header and before the first block.  When doing a raw inflate,
426  inflate() will go ahead and process the first block, and will return when it
427  gets to the end of that block, or when it runs out of data.
428
429    The Z_BLOCK option assists in appending to or combining deflate streams.
430  Also to assist in this, on return inflate() will set strm->data_type to the
431  number of unused bits in the last byte taken from strm->next_in, plus 64 if
432  inflate() is currently decoding the last block in the deflate stream, plus
433  128 if inflate() returned immediately after decoding an end-of-block code or
434  decoding the complete header up to just before the first byte of the deflate
435  stream.  The end-of-block will not be indicated until all of the uncompressed
436  data from that block has been written to strm->next_out.  The number of
437  unused bits may in general be greater than seven, except when bit 7 of
438  data_type is set, in which case the number of unused bits will be less than
439  eight.  data_type is set as noted here every time inflate() returns for all
440  flush options, and so can be used to determine the amount of currently
441  consumed input in bits.
442
443    The Z_TREES option behaves as Z_BLOCK does, but it also returns when the
444  end of each deflate block header is reached, before any actual data in that
445  block is decoded.  This allows the caller to determine the length of the
446  deflate block header for later use in random access within a deflate block.
447  256 is added to the value of strm->data_type when inflate() returns
448  immediately after reaching the end of the deflate block header.
449
450    inflate() should normally be called until it returns Z_STREAM_END or an
451  error.  However if all decompression is to be performed in a single step (a
452  single call of inflate), the parameter flush should be set to Z_FINISH.  In
453  this case all pending input is processed and all pending output is flushed;
454  avail_out must be large enough to hold all the uncompressed data.  (The size
455  of the uncompressed data may have been saved by the compressor for this
456  purpose.) The next operation on this stream must be inflateEnd to deallocate
457  the decompression state.  The use of Z_FINISH is never required, but can be
458  used to inform inflate that a faster approach may be used for the single
459  inflate() call.
460
461     In this implementation, inflate() always flushes as much output as
462  possible to the output buffer, and always uses the faster approach on the
463  first call.  So the only effect of the flush parameter in this implementation
464  is on the return value of inflate(), as noted below, or when it returns early
465  because Z_BLOCK or Z_TREES is used.
466
467     If a preset dictionary is needed after this call (see inflateSetDictionary
468  below), inflate sets strm->adler to the adler32 checksum of the dictionary
469  chosen by the compressor and returns Z_NEED_DICT; otherwise it sets
470  strm->adler to the adler32 checksum of all output produced so far (that is,
471  total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described
472  below.  At the end of the stream, inflate() checks that its computed adler32
473  checksum is equal to that saved by the compressor and returns Z_STREAM_END
474  only if the checksum is correct.
475
476    inflate() can decompress and check either zlib-wrapped or gzip-wrapped
477  deflate data.  The header type is detected automatically, if requested when
478  initializing with inflateInit2().  Any information contained in the gzip
479  header is not retained, so applications that need that information should
480  instead use raw inflate, see inflateInit2() below, or inflateBack() and
481  perform their own processing of the gzip header and trailer.
482
483    inflate() returns Z_OK if some progress has been made (more input processed
484  or more output produced), Z_STREAM_END if the end of the compressed data has
485  been reached and all uncompressed output has been produced, Z_NEED_DICT if a
486  preset dictionary is needed at this point, Z_DATA_ERROR if the input data was
487  corrupted (input stream not conforming to the zlib format or incorrect check
488  value), Z_STREAM_ERROR if the stream structure was inconsistent (for example
489  next_in or next_out was Z_NULL), Z_MEM_ERROR if there was not enough memory,
490  Z_BUF_ERROR if no progress is possible or if there was not enough room in the
491  output buffer when Z_FINISH is used.  Note that Z_BUF_ERROR is not fatal, and
492  inflate() can be called again with more input and more output space to
493  continue decompressing.  If Z_DATA_ERROR is returned, the application may
494  then call inflateSync() to look for a good compression block if a partial
495  recovery of the data is desired.
496*/
497
498
499ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm));
500/*
501     All dynamically allocated data structures for this stream are freed.
502   This function discards any unprocessed input and does not flush any pending
503   output.
504
505     inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state
506   was inconsistent.  In the error case, msg may be set but then points to a
507   static string (which must not be deallocated).
508*/
509
510
511                        /* Advanced functions */
512
513/*
514    The following functions are needed only in some special applications.
515*/
516
517/*
518ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm,
519                                     int  level,
520                                     int  method,
521                                     int  windowBits,
522                                     int  memLevel,
523                                     int  strategy));
524
525     This is another version of deflateInit with more compression options.  The
526   fields next_in, zalloc, zfree and opaque must be initialized before by the
527   caller.
528
529     The method parameter is the compression method.  It must be Z_DEFLATED in
530   this version of the library.
531
532     The windowBits parameter is the base two logarithm of the window size
533   (the size of the history buffer).  It should be in the range 8..15 for this
534   version of the library.  Larger values of this parameter result in better
535   compression at the expense of memory usage.  The default value is 15 if
536   deflateInit is used instead.
537
538     windowBits can also be -8..-15 for raw deflate.  In this case, -windowBits
539   determines the window size.  deflate() will then generate raw deflate data
540   with no zlib header or trailer, and will not compute an adler32 check value.
541
542     windowBits can also be greater than 15 for optional gzip encoding.  Add
543   16 to windowBits to write a simple gzip header and trailer around the
544   compressed data instead of a zlib wrapper.  The gzip header will have no
545   file name, no extra data, no comment, no modification time (set to zero), no
546   header crc, and the operating system will be set to 255 (unknown).  If a
547   gzip stream is being written, strm->adler is a crc32 instead of an adler32.
548
549     The memLevel parameter specifies how much memory should be allocated
550   for the internal compression state.  memLevel=1 uses minimum memory but is
551   slow and reduces compression ratio; memLevel=9 uses maximum memory for
552   optimal speed.  The default value is 8.  See zconf.h for total memory usage
553   as a function of windowBits and memLevel.
554
555     The strategy parameter is used to tune the compression algorithm.  Use the
556   value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a
557   filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no
558   string match), or Z_RLE to limit match distances to one (run-length
559   encoding).  Filtered data consists mostly of small values with a somewhat
560   random distribution.  In this case, the compression algorithm is tuned to
561   compress them better.  The effect of Z_FILTERED is to force more Huffman
562   coding and less string matching; it is somewhat intermediate between
563   Z_DEFAULT_STRATEGY and Z_HUFFMAN_ONLY.  Z_RLE is designed to be almost as
564   fast as Z_HUFFMAN_ONLY, but give better compression for PNG image data.  The
565   strategy parameter only affects the compression ratio but not the
566   correctness of the compressed output even if it is not set appropriately.
567   Z_FIXED prevents the use of dynamic Huffman codes, allowing for a simpler
568   decoder for special applications.
569
570     deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
571   memory, Z_STREAM_ERROR if any parameter is invalid (such as an invalid
572   method), or Z_VERSION_ERROR if the zlib library version (zlib_version) is
573   incompatible with the version assumed by the caller (ZLIB_VERSION).  msg is
574   set to null if there is no error message.  deflateInit2 does not perform any
575   compression: this will be done by deflate().
576*/
577
578ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm,
579                                             const Bytef *dictionary,
580                                             uInt  dictLength));
581/*
582     Initializes the compression dictionary from the given byte sequence
583   without producing any compressed output.  This function must be called
584   immediately after deflateInit, deflateInit2 or deflateReset, before any call
585   of deflate.  The compressor and decompressor must use exactly the same
586   dictionary (see inflateSetDictionary).
587
588     The dictionary should consist of strings (byte sequences) that are likely
589   to be encountered later in the data to be compressed, with the most commonly
590   used strings preferably put towards the end of the dictionary.  Using a
591   dictionary is most useful when the data to be compressed is short and can be
592   predicted with good accuracy; the data can then be compressed better than
593   with the default empty dictionary.
594
595     Depending on the size of the compression data structures selected by
596   deflateInit or deflateInit2, a part of the dictionary may in effect be
597   discarded, for example if the dictionary is larger than the window size
598   provided in deflateInit or deflateInit2.  Thus the strings most likely to be
599   useful should be put at the end of the dictionary, not at the front.  In
600   addition, the current implementation of deflate will use at most the window
601   size minus 262 bytes of the provided dictionary.
602
603     Upon return of this function, strm->adler is set to the adler32 value
604   of the dictionary; the decompressor may later use this value to determine
605   which dictionary has been used by the compressor.  (The adler32 value
606   applies to the whole dictionary even if only a subset of the dictionary is
607   actually used by the compressor.) If a raw deflate was requested, then the
608   adler32 value is not computed and strm->adler is not set.
609
610     deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a
611   parameter is invalid (e.g.  dictionary being Z_NULL) or the stream state is
612   inconsistent (for example if deflate has already been called for this stream
613   or if the compression method is bsort).  deflateSetDictionary does not
614   perform any compression: this will be done by deflate().
615*/
616
617ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest,
618                                    z_streamp source));
619/*
620     Sets the destination stream as a complete copy of the source stream.
621
622     This function can be useful when several compression strategies will be
623   tried, for example when there are several ways of pre-processing the input
624   data with a filter.  The streams that will be discarded should then be freed
625   by calling deflateEnd.  Note that deflateCopy duplicates the internal
626   compression state which can be quite large, so this strategy is slow and can
627   consume lots of memory.
628
629     deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
630   enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
631   (such as zalloc being Z_NULL).  msg is left unchanged in both source and
632   destination.
633*/
634
635ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm));
636/*
637     This function is equivalent to deflateEnd followed by deflateInit,
638   but does not free and reallocate all the internal compression state.  The
639   stream will keep the same compression level and any other attributes that
640   may have been set by deflateInit2.
641
642     deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
643   stream state was inconsistent (such as zalloc or state being Z_NULL).
644*/
645
646ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm,
647                                      int level,
648                                      int strategy));
649/*
650     Dynamically update the compression level and compression strategy.  The
651   interpretation of level and strategy is as in deflateInit2.  This can be
652   used to switch between compression and straight copy of the input data, or
653   to switch to a different kind of input data requiring a different strategy.
654   If the compression level is changed, the input available so far is
655   compressed with the old level (and may be flushed); the new level will take
656   effect only at the next call of deflate().
657
658     Before the call of deflateParams, the stream state must be set as for
659   a call of deflate(), since the currently available input may have to be
660   compressed and flushed.  In particular, strm->avail_out must be non-zero.
661
662     deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source
663   stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR if
664   strm->avail_out was zero.
665*/
666
667ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm,
668                                    int good_length,
669                                    int max_lazy,
670                                    int nice_length,
671                                    int max_chain));
672/*
673     Fine tune deflate's internal compression parameters.  This should only be
674   used by someone who understands the algorithm used by zlib's deflate for
675   searching for the best matching string, and even then only by the most
676   fanatic optimizer trying to squeeze out the last compressed bit for their
677   specific input data.  Read the deflate.c source code for the meaning of the
678   max_lazy, good_length, nice_length, and max_chain parameters.
679
680     deflateTune() can be called after deflateInit() or deflateInit2(), and
681   returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream.
682 */
683
684ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm,
685                                       uLong sourceLen));
686/*
687     deflateBound() returns an upper bound on the compressed size after
688   deflation of sourceLen bytes.  It must be called after deflateInit() or
689   deflateInit2(), and after deflateSetHeader(), if used.  This would be used
690   to allocate an output buffer for deflation in a single pass, and so would be
691   called before deflate().
692*/
693
694ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm,
695                                     int bits,
696                                     int value));
697/*
698     deflatePrime() inserts bits in the deflate output stream.  The intent
699   is that this function is used to start off the deflate output with the bits
700   leftover from a previous deflate stream when appending to it.  As such, this
701   function can only be used for raw deflate, and must be used before the first
702   deflate() call after a deflateInit2() or deflateReset().  bits must be less
703   than or equal to 16, and that many of the least significant bits of value
704   will be inserted in the output.
705
706     deflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source
707   stream state was inconsistent.
708*/
709
710ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm,
711                                         gz_headerp head));
712/*
713     deflateSetHeader() provides gzip header information for when a gzip
714   stream is requested by deflateInit2().  deflateSetHeader() may be called
715   after deflateInit2() or deflateReset() and before the first call of
716   deflate().  The text, time, os, extra field, name, and comment information
717   in the provided gz_header structure are written to the gzip header (xflag is
718   ignored -- the extra flags are set according to the compression level).  The
719   caller must assure that, if not Z_NULL, name and comment are terminated with
720   a zero byte, and that if extra is not Z_NULL, that extra_len bytes are
721   available there.  If hcrc is true, a gzip header crc is included.  Note that
722   the current versions of the command-line version of gzip (up through version
723   1.3.x) do not support header crc's, and will report that it is a "multi-part
724   gzip file" and give up.
725
726     If deflateSetHeader is not used, the default gzip header has text false,
727   the time set to zero, and os set to 255, with no extra, name, or comment
728   fields.  The gzip header is returned to the default state by deflateReset().
729
730     deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
731   stream state was inconsistent.
732*/
733
734/*
735ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,
736                                     int  windowBits));
737
738     This is another version of inflateInit with an extra parameter.  The
739   fields next_in, avail_in, zalloc, zfree and opaque must be initialized
740   before by the caller.
741
742     The windowBits parameter is the base two logarithm of the maximum window
743   size (the size of the history buffer).  It should be in the range 8..15 for
744   this version of the library.  The default value is 15 if inflateInit is used
745   instead.  windowBits must be greater than or equal to the windowBits value
746   provided to deflateInit2() while compressing, or it must be equal to 15 if
747   deflateInit2() was not used.  If a compressed stream with a larger window
748   size is given as input, inflate() will return with the error code
749   Z_DATA_ERROR instead of trying to allocate a larger window.
750
751     windowBits can also be zero to request that inflate use the window size in
752   the zlib header of the compressed stream.
753
754     windowBits can also be -8..-15 for raw inflate.  In this case, -windowBits
755   determines the window size.  inflate() will then process raw deflate data,
756   not looking for a zlib or gzip header, not generating a check value, and not
757   looking for any check values for comparison at the end of the stream.  This
758   is for use with other formats that use the deflate compressed data format
759   such as zip.  Those formats provide their own check values.  If a custom
760   format is developed using the raw deflate format for compressed data, it is
761   recommended that a check value such as an adler32 or a crc32 be applied to
762   the uncompressed data as is done in the zlib, gzip, and zip formats.  For
763   most applications, the zlib format should be used as is.  Note that comments
764   above on the use in deflateInit2() applies to the magnitude of windowBits.
765
766     windowBits can also be greater than 15 for optional gzip decoding.  Add
767   32 to windowBits to enable zlib and gzip decoding with automatic header
768   detection, or add 16 to decode only the gzip format (the zlib format will
769   return a Z_DATA_ERROR).  If a gzip stream is being decoded, strm->adler is a
770   crc32 instead of an adler32.
771
772     inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
773   memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
774   version assumed by the caller, or Z_STREAM_ERROR if the parameters are
775   invalid, such as a null pointer to the structure.  msg is set to null if
776   there is no error message.  inflateInit2 does not perform any decompression
777   apart from possibly reading the zlib header if present: actual decompression
778   will be done by inflate().  (So next_in and avail_in may be modified, but
779   next_out and avail_out are unused and unchanged.) The current implementation
780   of inflateInit2() does not process any header information -- that is
781   deferred until inflate() is called.
782*/
783
784ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm,
785                                             const Bytef *dictionary,
786                                             uInt  dictLength));
787/*
788     Initializes the decompression dictionary from the given uncompressed byte
789   sequence.  This function must be called immediately after a call of inflate,
790   if that call returned Z_NEED_DICT.  The dictionary chosen by the compressor
791   can be determined from the adler32 value returned by that call of inflate.
792   The compressor and decompressor must use exactly the same dictionary (see
793   deflateSetDictionary).  For raw inflate, this function can be called
794   immediately after inflateInit2() or inflateReset() and before any call of
795   inflate() to set the dictionary.  The application must insure that the
796   dictionary that was used for compression is provided.
797
798     inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
799   parameter is invalid (e.g.  dictionary being Z_NULL) or the stream state is
800   inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the
801   expected one (incorrect adler32 value).  inflateSetDictionary does not
802   perform any decompression: this will be done by subsequent calls of
803   inflate().
804*/
805
806ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm));
807/*
808     Skips invalid compressed data until a full flush point (see above the
809   description of deflate with Z_FULL_FLUSH) can be found, or until all
810   available input is skipped.  No output is provided.
811
812     inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR
813   if no more input was provided, Z_DATA_ERROR if no flush point has been
814   found, or Z_STREAM_ERROR if the stream structure was inconsistent.  In the
815   success case, the application may save the current current value of total_in
816   which indicates where valid compressed data was found.  In the error case,
817   the application may repeatedly call inflateSync, providing more input each
818   time, until success or end of the input data.
819*/
820
821ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest,
822                                    z_streamp source));
823/*
824     Sets the destination stream as a complete copy of the source stream.
825
826     This function can be useful when randomly accessing a large stream.  The
827   first pass through the stream can periodically record the inflate state,
828   allowing restarting inflate at those points when randomly accessing the
829   stream.
830
831     inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
832   enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
833   (such as zalloc being Z_NULL).  msg is left unchanged in both source and
834   destination.
835*/
836
837ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm));
838/*
839     This function is equivalent to inflateEnd followed by inflateInit,
840   but does not free and reallocate all the internal decompression state.  The
841   stream will keep attributes that may have been set by inflateInit2.
842
843     inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
844   stream state was inconsistent (such as zalloc or state being Z_NULL).
845*/
846
847ZEXTERN int ZEXPORT inflateReset2 OF((z_streamp strm,
848                                      int windowBits));
849/*
850     This function is the same as inflateReset, but it also permits changing
851   the wrap and window size requests.  The windowBits parameter is interpreted
852   the same as it is for inflateInit2.
853
854     inflateReset2 returns Z_OK if success, or Z_STREAM_ERROR if the source
855   stream state was inconsistent (such as zalloc or state being Z_NULL), or if
856   the windowBits parameter is invalid.
857*/
858
859ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm,
860                                     int bits,
861                                     int value));
862/*
863     This function inserts bits in the inflate input stream.  The intent is
864   that this function is used to start inflating at a bit position in the
865   middle of a byte.  The provided bits will be used before any bytes are used
866   from next_in.  This function should only be used with raw inflate, and
867   should be used before the first inflate() call after inflateInit2() or
868   inflateReset().  bits must be less than or equal to 16, and that many of the
869   least significant bits of value will be inserted in the input.
870
871     If bits is negative, then the input stream bit buffer is emptied.  Then
872   inflatePrime() can be called again to put bits in the buffer.  This is used
873   to clear out bits leftover after feeding inflate a block description prior
874   to feeding inflate codes.
875
876     inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source
877   stream state was inconsistent.
878*/
879
880ZEXTERN long ZEXPORT inflateMark OF((z_streamp strm));
881/*
882     This function returns two values, one in the lower 16 bits of the return
883   value, and the other in the remaining upper bits, obtained by shifting the
884   return value down 16 bits.  If the upper value is -1 and the lower value is
885   zero, then inflate() is currently decoding information outside of a block.
886   If the upper value is -1 and the lower value is non-zero, then inflate is in
887   the middle of a stored block, with the lower value equaling the number of
888   bytes from the input remaining to copy.  If the upper value is not -1, then
889   it is the number of bits back from the current bit position in the input of
890   the code (literal or length/distance pair) currently being processed.  In
891   that case the lower value is the number of bytes already emitted for that
892   code.
893
894     A code is being processed if inflate is waiting for more input to complete
895   decoding of the code, or if it has completed decoding but is waiting for
896   more output space to write the literal or match data.
897
898     inflateMark() is used to mark locations in the input data for random
899   access, which may be at bit positions, and to note those cases where the
900   output of a code may span boundaries of random access blocks.  The current
901   location in the input stream can be determined from avail_in and data_type
902   as noted in the description for the Z_BLOCK flush parameter for inflate.
903
904     inflateMark returns the value noted above or -1 << 16 if the provided
905   source stream state was inconsistent.
906*/
907
908ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm,
909                                         gz_headerp head));
910/*
911     inflateGetHeader() requests that gzip header information be stored in the
912   provided gz_header structure.  inflateGetHeader() may be called after
913   inflateInit2() or inflateReset(), and before the first call of inflate().
914   As inflate() processes the gzip stream, head->done is zero until the header
915   is completed, at which time head->done is set to one.  If a zlib stream is
916   being decoded, then head->done is set to -1 to indicate that there will be
917   no gzip header information forthcoming.  Note that Z_BLOCK or Z_TREES can be
918   used to force inflate() to return immediately after header processing is
919   complete and before any actual data is decompressed.
920
921     The text, time, xflags, and os fields are filled in with the gzip header
922   contents.  hcrc is set to true if there is a header CRC.  (The header CRC
923   was valid if done is set to one.) If extra is not Z_NULL, then extra_max
924   contains the maximum number of bytes to write to extra.  Once done is true,
925   extra_len contains the actual extra field length, and extra contains the
926   extra field, or that field truncated if extra_max is less than extra_len.
927   If name is not Z_NULL, then up to name_max characters are written there,
928   terminated with a zero unless the length is greater than name_max.  If
929   comment is not Z_NULL, then up to comm_max characters are written there,
930   terminated with a zero unless the length is greater than comm_max.  When any
931   of extra, name, or comment are not Z_NULL and the respective field is not
932   present in the header, then that field is set to Z_NULL to signal its
933   absence.  This allows the use of deflateSetHeader() with the returned
934   structure to duplicate the header.  However if those fields are set to
935   allocated memory, then the application will need to save those pointers
936   elsewhere so that they can be eventually freed.
937
938     If inflateGetHeader is not used, then the header information is simply
939   discarded.  The header is always checked for validity, including the header
940   CRC if present.  inflateReset() will reset the process to discard the header
941   information.  The application would need to call inflateGetHeader() again to
942   retrieve the header from the next gzip stream.
943
944     inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
945   stream state was inconsistent.
946*/
947
948/*
949ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits,
950                                        unsigned char FAR *window));
951
952     Initialize the internal stream state for decompression using inflateBack()
953   calls.  The fields zalloc, zfree and opaque in strm must be initialized
954   before the call.  If zalloc and zfree are Z_NULL, then the default library-
955   derived memory allocation routines are used.  windowBits is the base two
956   logarithm of the window size, in the range 8..15.  window is a caller
957   supplied buffer of that size.  Except for special applications where it is
958   assured that deflate was used with small window sizes, windowBits must be 15
959   and a 32K byte window must be supplied to be able to decompress general
960   deflate streams.
961
962     See inflateBack() for the usage of these routines.
963
964     inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of
965   the paramaters are invalid, Z_MEM_ERROR if the internal state could not be
966   allocated, or Z_VERSION_ERROR if the version of the library does not match
967   the version of the header file.
968*/
969
970typedef unsigned (*in_func) OF((void FAR *, unsigned char FAR * FAR *));
971typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned));
972
973ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm,
974                                    in_func in, void FAR *in_desc,
975                                    out_func out, void FAR *out_desc));
976/*
977     inflateBack() does a raw inflate with a single call using a call-back
978   interface for input and output.  This is more efficient than inflate() for
979   file i/o applications in that it avoids copying between the output and the
980   sliding window by simply making the window itself the output buffer.  This
981   function trusts the application to not change the output buffer passed by
982   the output function, at least until inflateBack() returns.
983
984     inflateBackInit() must be called first to allocate the internal state
985   and to initialize the state with the user-provided window buffer.
986   inflateBack() may then be used multiple times to inflate a complete, raw
987   deflate stream with each call.  inflateBackEnd() is then called to free the
988   allocated state.
989
990     A raw deflate stream is one with no zlib or gzip header or trailer.
991   This routine would normally be used in a utility that reads zip or gzip
992   files and writes out uncompressed files.  The utility would decode the
993   header and process the trailer on its own, hence this routine expects only
994   the raw deflate stream to decompress.  This is different from the normal
995   behavior of inflate(), which expects either a zlib or gzip header and
996   trailer around the deflate stream.
997
998     inflateBack() uses two subroutines supplied by the caller that are then
999   called by inflateBack() for input and output.  inflateBack() calls those
1000   routines until it reads a complete deflate stream and writes out all of the
1001   uncompressed data, or until it encounters an error.  The function's
1002   parameters and return types are defined above in the in_func and out_func
1003   typedefs.  inflateBack() will call in(in_desc, &buf) which should return the
1004   number of bytes of provided input, and a pointer to that input in buf.  If
1005   there is no input available, in() must return zero--buf is ignored in that
1006   case--and inflateBack() will return a buffer error.  inflateBack() will call
1007   out(out_desc, buf, len) to write the uncompressed data buf[0..len-1].  out()
1008   should return zero on success, or non-zero on failure.  If out() returns
1009   non-zero, inflateBack() will return with an error.  Neither in() nor out()
1010   are permitted to change the contents of the window provided to
1011   inflateBackInit(), which is also the buffer that out() uses to write from.
1012   The length written by out() will be at most the window size.  Any non-zero
1013   amount of input may be provided by in().
1014
1015     For convenience, inflateBack() can be provided input on the first call by
1016   setting strm->next_in and strm->avail_in.  If that input is exhausted, then
1017   in() will be called.  Therefore strm->next_in must be initialized before
1018   calling inflateBack().  If strm->next_in is Z_NULL, then in() will be called
1019   immediately for input.  If strm->next_in is not Z_NULL, then strm->avail_in
1020   must also be initialized, and then if strm->avail_in is not zero, input will
1021   initially be taken from strm->next_in[0 ..  strm->avail_in - 1].
1022
1023     The in_desc and out_desc parameters of inflateBack() is passed as the
1024   first parameter of in() and out() respectively when they are called.  These
1025   descriptors can be optionally used to pass any information that the caller-
1026   supplied in() and out() functions need to do their job.
1027
1028     On return, inflateBack() will set strm->next_in and strm->avail_in to
1029   pass back any unused input that was provided by the last in() call.  The
1030   return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR
1031   if in() or out() returned an error, Z_DATA_ERROR if there was a format error
1032   in the deflate stream (in which case strm->msg is set to indicate the nature
1033   of the error), or Z_STREAM_ERROR if the stream was not properly initialized.
1034   In the case of Z_BUF_ERROR, an input or output error can be distinguished
1035   using strm->next_in which will be Z_NULL only if in() returned an error.  If
1036   strm->next_in is not Z_NULL, then the Z_BUF_ERROR was due to out() returning
1037   non-zero.  (in() will always be called before out(), so strm->next_in is
1038   assured to be defined if out() returns non-zero.) Note that inflateBack()
1039   cannot return Z_OK.
1040*/
1041
1042ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm));
1043/*
1044     All memory allocated by inflateBackInit() is freed.
1045
1046     inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream
1047   state was inconsistent.
1048*/
1049
1050ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void));
1051/* Return flags indicating compile-time options.
1052
1053    Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other:
1054     1.0: size of uInt
1055     3.2: size of uLong
1056     5.4: size of voidpf (pointer)
1057     7.6: size of z_off_t
1058
1059    Compiler, assembler, and debug options:
1060     8: DEBUG
1061     9: ASMV or ASMINF -- use ASM code
1062     10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention
1063     11: 0 (reserved)
1064
1065    One-time table building (smaller code, but not thread-safe if true):
1066     12: BUILDFIXED -- build static block decoding tables when needed
1067     13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed
1068     14,15: 0 (reserved)
1069
1070    Library content (indicates missing functionality):
1071     16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking
1072                          deflate code when not needed)
1073     17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect
1074                    and decode gzip streams (to avoid linking crc code)
1075     18-19: 0 (reserved)
1076
1077    Operation variations (changes in library functionality):
1078     20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate
1079     21: FASTEST -- deflate algorithm with only one, lowest compression level
1080     22,23: 0 (reserved)
1081
1082    The sprintf variant used by gzprintf (zero is best):
1083     24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format
1084     25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure!
1085     26: 0 = returns value, 1 = void -- 1 means inferred string length returned
1086
1087    Remainder:
1088     27-31: 0 (reserved)
1089 */
1090
1091
1092                        /* utility functions */
1093
1094/*
1095     The following utility functions are implemented on top of the basic
1096   stream-oriented functions.  To simplify the interface, some default options
1097   are assumed (compression level and memory usage, standard memory allocation
1098   functions).  The source code of these utility functions can be modified if
1099   you need special options.
1100*/
1101
1102ZEXTERN int ZEXPORT compress OF((Bytef *dest,   uLongf *destLen,
1103                                 const Bytef *source, uLong sourceLen));
1104/*
1105     Compresses the source buffer into the destination buffer.  sourceLen is
1106   the byte length of the source buffer.  Upon entry, destLen is the total size
1107   of the destination buffer, which must be at least the value returned by
1108   compressBound(sourceLen).  Upon exit, destLen is the actual size of the
1109   compressed buffer.
1110
1111     compress returns Z_OK if success, Z_MEM_ERROR if there was not
1112   enough memory, Z_BUF_ERROR if there was not enough room in the output
1113   buffer.
1114*/
1115
1116ZEXTERN int ZEXPORT compress2 OF((Bytef *dest,   uLongf *destLen,
1117                                  const Bytef *source, uLong sourceLen,
1118                                  int level));
1119/*
1120     Compresses the source buffer into the destination buffer.  The level
1121   parameter has the same meaning as in deflateInit.  sourceLen is the byte
1122   length of the source buffer.  Upon entry, destLen is the total size of the
1123   destination buffer, which must be at least the value returned by
1124   compressBound(sourceLen).  Upon exit, destLen is the actual size of the
1125   compressed buffer.
1126
1127     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
1128   memory, Z_BUF_ERROR if there was not enough room in the output buffer,
1129   Z_STREAM_ERROR if the level parameter is invalid.
1130*/
1131
1132ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen));
1133/*
1134     compressBound() returns an upper bound on the compressed size after
1135   compress() or compress2() on sourceLen bytes.  It would be used before a
1136   compress() or compress2() call to allocate the destination buffer.
1137*/
1138
1139ZEXTERN int ZEXPORT uncompress OF((Bytef *dest,   uLongf *destLen,
1140                                   const Bytef *source, uLong sourceLen));
1141/*
1142     Decompresses the source buffer into the destination buffer.  sourceLen is
1143   the byte length of the source buffer.  Upon entry, destLen is the total size
1144   of the destination buffer, which must be large enough to hold the entire
1145   uncompressed data.  (The size of the uncompressed data must have been saved
1146   previously by the compressor and transmitted to the decompressor by some
1147   mechanism outside the scope of this compression library.) Upon exit, destLen
1148   is the actual size of the uncompressed buffer.
1149
1150     uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
1151   enough memory, Z_BUF_ERROR if there was not enough room in the output
1152   buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete.
1153*/
1154
1155
1156                        /* gzip file access functions */
1157
1158/*
1159     This library supports reading and writing files in gzip (.gz) format with
1160   an interface similar to that of stdio, using the functions that start with
1161   "gz".  The gzip format is different from the zlib format.  gzip is a gzip
1162   wrapper, documented in RFC 1952, wrapped around a deflate stream.
1163*/
1164
1165typedef voidp gzFile;       /* opaque gzip file descriptor */
1166
1167/*
1168ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode));
1169
1170     Opens a gzip (.gz) file for reading or writing.  The mode parameter is as
1171   in fopen ("rb" or "wb") but can also include a compression level ("wb9") or
1172   a strategy: 'f' for filtered data as in "wb6f", 'h' for Huffman-only
1173   compression as in "wb1h", 'R' for run-length encoding as in "wb1R", or 'F'
1174   for fixed code compression as in "wb9F".  (See the description of
1175   deflateInit2 for more information about the strategy parameter.) Also "a"
1176   can be used instead of "w" to request that the gzip stream that will be
1177   written be appended to the file.  "+" will result in an error, since reading
1178   and writing to the same gzip file is not supported.
1179
1180     gzopen can be used to read a file which is not in gzip format; in this
1181   case gzread will directly read from the file without decompression.
1182
1183     gzopen returns NULL if the file could not be opened, if there was
1184   insufficient memory to allocate the gzFile state, or if an invalid mode was
1185   specified (an 'r', 'w', or 'a' was not provided, or '+' was provided).
1186   errno can be checked to determine if the reason gzopen failed was that the
1187   file could not be opened.
1188*/
1189
1190ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode));
1191/*
1192     gzdopen associates a gzFile with the file descriptor fd.  File descriptors
1193   are obtained from calls like open, dup, creat, pipe or fileno (if the file
1194   has been previously opened with fopen).  The mode parameter is as in gzopen.
1195
1196     The next call of gzclose on the returned gzFile will also close the file
1197   descriptor fd, just like fclose(fdopen(fd, mode)) closes the file descriptor
1198   fd.  If you want to keep fd open, use fd = dup(fd_keep); gz = gzdopen(fd,
1199   mode);.  The duplicated descriptor should be saved to avoid a leak, since
1200   gzdopen does not close fd if it fails.
1201
1202     gzdopen returns NULL if there was insufficient memory to allocate the
1203   gzFile state, if an invalid mode was specified (an 'r', 'w', or 'a' was not
1204   provided, or '+' was provided), or if fd is -1.  The file descriptor is not
1205   used until the next gz* read, write, seek, or close operation, so gzdopen
1206   will not detect if fd is invalid (unless fd is -1).
1207*/
1208
1209ZEXTERN int ZEXPORT gzbuffer OF((gzFile file, unsigned size));
1210/*
1211     Set the internal buffer size used by this library's functions.  The
1212   default buffer size is 8192 bytes.  This function must be called after
1213   gzopen() or gzdopen(), and before any other calls that read or write the
1214   file.  The buffer memory allocation is always deferred to the first read or
1215   write.  Two buffers are allocated, either both of the specified size when
1216   writing, or one of the specified size and the other twice that size when
1217   reading.  A larger buffer size of, for example, 64K or 128K bytes will
1218   noticeably increase the speed of decompression (reading).
1219
1220     The new buffer size also affects the maximum length for gzprintf().
1221
1222     gzbuffer() returns 0 on success, or -1 on failure, such as being called
1223   too late.
1224*/
1225
1226ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy));
1227/*
1228     Dynamically update the compression level or strategy.  See the description
1229   of deflateInit2 for the meaning of these parameters.
1230
1231     gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not
1232   opened for writing.
1233*/
1234
1235ZEXTERN int ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len));
1236/*
1237     Reads the given number of uncompressed bytes from the compressed file.  If
1238   the input file was not in gzip format, gzread copies the given number of
1239   bytes into the buffer.
1240
1241     After reaching the end of a gzip stream in the input, gzread will continue
1242   to read, looking for another gzip stream, or failing that, reading the rest
1243   of the input file directly without decompression.  The entire input file
1244   will be read if gzread is called until it returns less than the requested
1245   len.
1246
1247     gzread returns the number of uncompressed bytes actually read, less than
1248   len for end of file, or -1 for error.
1249*/
1250
1251ZEXTERN int ZEXPORT gzwrite OF((gzFile file,
1252                                voidpc buf, unsigned len));
1253/*
1254     Writes the given number of uncompressed bytes into the compressed file.
1255   gzwrite returns the number of uncompressed bytes written or 0 in case of
1256   error.
1257*/
1258
1259ZEXTERN int ZEXPORTVA gzprintf OF((gzFile file, const char *format, ...));
1260/*
1261     Converts, formats, and writes the arguments to the compressed file under
1262   control of the format string, as in fprintf.  gzprintf returns the number of
1263   uncompressed bytes actually written, or 0 in case of error.  The number of
1264   uncompressed bytes written is limited to 8191, or one less than the buffer
1265   size given to gzbuffer().  The caller should assure that this limit is not
1266   exceeded.  If it is exceeded, then gzprintf() will return an error (0) with
1267   nothing written.  In this case, there may also be a buffer overflow with
1268   unpredictable consequences, which is possible only if zlib was compiled with
1269   the insecure functions sprintf() or vsprintf() because the secure snprintf()
1270   or vsnprintf() functions were not available.  This can be determined using
1271   zlibCompileFlags().
1272*/
1273
1274ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s));
1275/*
1276     Writes the given null-terminated string to the compressed file, excluding
1277   the terminating null character.
1278
1279     gzputs returns the number of characters written, or -1 in case of error.
1280*/
1281
1282ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len));
1283/*
1284     Reads bytes from the compressed file until len-1 characters are read, or a
1285   newline character is read and transferred to buf, or an end-of-file
1286   condition is encountered.  If any characters are read or if len == 1, the
1287   string is terminated with a null character.  If no characters are read due
1288   to an end-of-file or len < 1, then the buffer is left untouched.
1289
1290     gzgets returns buf which is a null-terminated string, or it returns NULL
1291   for end-of-file or in case of error.  If there was an error, the contents at
1292   buf are indeterminate.
1293*/
1294
1295ZEXTERN int ZEXPORT gzputc OF((gzFile file, int c));
1296/*
1297     Writes c, converted to an unsigned char, into the compressed file.  gzputc
1298   returns the value that was written, or -1 in case of error.
1299*/
1300
1301ZEXTERN int ZEXPORT gzgetc OF((gzFile file));
1302/*
1303     Reads one byte from the compressed file.  gzgetc returns this byte or -1
1304   in case of end of file or error.
1305*/
1306
1307ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file));
1308/*
1309     Push one character back onto the stream to be read as the first character
1310   on the next read.  At least one character of push-back is allowed.
1311   gzungetc() returns the character pushed, or -1 on failure.  gzungetc() will
1312   fail if c is -1, and may fail if a character has been pushed but not read
1313   yet.  If gzungetc is used immediately after gzopen or gzdopen, at least the
1314   output buffer size of pushed characters is allowed.  (See gzbuffer above.)
1315   The pushed character will be discarded if the stream is repositioned with
1316   gzseek() or gzrewind().
1317*/
1318
1319ZEXTERN int ZEXPORT gzflush OF((gzFile file, int flush));
1320/*
1321     Flushes all pending output into the compressed file.  The parameter flush
1322   is as in the deflate() function.  The return value is the zlib error number
1323   (see function gzerror below).  gzflush is only permitted when writing.
1324
1325     If the flush parameter is Z_FINISH, the remaining data is written and the
1326   gzip stream is completed in the output.  If gzwrite() is called again, a new
1327   gzip stream will be started in the output.  gzread() is able to read such
1328   concatented gzip streams.
1329
1330     gzflush should be called only when strictly necessary because it will
1331   degrade compression if called too often.
1332*/
1333
1334/*
1335ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile file,
1336                                   z_off_t offset, int whence));
1337
1338     Sets the starting position for the next gzread or gzwrite on the given
1339   compressed file.  The offset represents a number of bytes in the
1340   uncompressed data stream.  The whence parameter is defined as in lseek(2);
1341   the value SEEK_END is not supported.
1342
1343     If the file is opened for reading, this function is emulated but can be
1344   extremely slow.  If the file is opened for writing, only forward seeks are
1345   supported; gzseek then compresses a sequence of zeroes up to the new
1346   starting position.
1347
1348     gzseek returns the resulting offset location as measured in bytes from
1349   the beginning of the uncompressed stream, or -1 in case of error, in
1350   particular if the file is opened for writing and the new starting position
1351   would be before the current position.
1352*/
1353
1354ZEXTERN int ZEXPORT    gzrewind OF((gzFile file));
1355/*
1356     Rewinds the given file. This function is supported only for reading.
1357
1358     gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET)
1359*/
1360
1361/*
1362ZEXTERN z_off_t ZEXPORT    gztell OF((gzFile file));
1363
1364     Returns the starting position for the next gzread or gzwrite on the given
1365   compressed file.  This position represents a number of bytes in the
1366   uncompressed data stream, and is zero when starting, even if appending or
1367   reading a gzip stream from the middle of a file using gzdopen().
1368
1369     gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR)
1370*/
1371
1372/*
1373ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile file));
1374
1375     Returns the current offset in the file being read or written.  This offset
1376   includes the count of bytes that precede the gzip stream, for example when
1377   appending or when using gzdopen() for reading.  When reading, the offset
1378   does not include as yet unused buffered input.  This information can be used
1379   for a progress indicator.  On error, gzoffset() returns -1.
1380*/
1381
1382ZEXTERN int ZEXPORT gzeof OF((gzFile file));
1383/*
1384     Returns true (1) if the end-of-file indicator has been set while reading,
1385   false (0) otherwise.  Note that the end-of-file indicator is set only if the
1386   read tried to go past the end of the input, but came up short.  Therefore,
1387   just like feof(), gzeof() may return false even if there is no more data to
1388   read, in the event that the last read request was for the exact number of
1389   bytes remaining in the input file.  This will happen if the input file size
1390   is an exact multiple of the buffer size.
1391
1392     If gzeof() returns true, then the read functions will return no more data,
1393   unless the end-of-file indicator is reset by gzclearerr() and the input file
1394   has grown since the previous end of file was detected.
1395*/
1396
1397ZEXTERN int ZEXPORT gzdirect OF((gzFile file));
1398/*
1399     Returns true (1) if file is being copied directly while reading, or false
1400   (0) if file is a gzip stream being decompressed.  This state can change from
1401   false to true while reading the input file if the end of a gzip stream is
1402   reached, but is followed by data that is not another gzip stream.
1403
1404     If the input file is empty, gzdirect() will return true, since the input
1405   does not contain a gzip stream.
1406
1407     If gzdirect() is used immediately after gzopen() or gzdopen() it will
1408   cause buffers to be allocated to allow reading the file to determine if it
1409   is a gzip file.  Therefore if gzbuffer() is used, it should be called before
1410   gzdirect().
1411*/
1412
1413ZEXTERN int ZEXPORT    gzclose OF((gzFile file));
1414/*
1415     Flushes all pending output if necessary, closes the compressed file and
1416   deallocates the (de)compression state.  Note that once file is closed, you
1417   cannot call gzerror with file, since its structures have been deallocated.
1418   gzclose must not be called more than once on the same file, just as free
1419   must not be called more than once on the same allocation.
1420
1421     gzclose will return Z_STREAM_ERROR if file is not valid, Z_ERRNO on a
1422   file operation error, or Z_OK on success.
1423*/
1424
1425ZEXTERN int ZEXPORT gzclose_r OF((gzFile file));
1426ZEXTERN int ZEXPORT gzclose_w OF((gzFile file));
1427/*
1428     Same as gzclose(), but gzclose_r() is only for use when reading, and
1429   gzclose_w() is only for use when writing or appending.  The advantage to
1430   using these instead of gzclose() is that they avoid linking in zlib
1431   compression or decompression code that is not used when only reading or only
1432   writing respectively.  If gzclose() is used, then both compression and
1433   decompression code will be included the application when linking to a static
1434   zlib library.
1435*/
1436
1437ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum));
1438/*
1439     Returns the error message for the last error which occurred on the given
1440   compressed file.  errnum is set to zlib error number.  If an error occurred
1441   in the file system and not in the compression library, errnum is set to
1442   Z_ERRNO and the application may consult errno to get the exact error code.
1443
1444     The application must not modify the returned string.  Future calls to
1445   this function may invalidate the previously returned string.  If file is
1446   closed, then the string previously returned by gzerror will no longer be
1447   available.
1448
1449     gzerror() should be used to distinguish errors from end-of-file for those
1450   functions above that do not distinguish those cases in their return values.
1451*/
1452
1453ZEXTERN void ZEXPORT gzclearerr OF((gzFile file));
1454/*
1455     Clears the error and end-of-file flags for file.  This is analogous to the
1456   clearerr() function in stdio.  This is useful for continuing to read a gzip
1457   file that is being written concurrently.
1458*/
1459
1460
1461                        /* checksum functions */
1462
1463/*
1464     These functions are not related to compression but are exported
1465   anyway because they might be useful in applications using the compression
1466   library.
1467*/
1468
1469ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
1470/*
1471     Update a running Adler-32 checksum with the bytes buf[0..len-1] and
1472   return the updated checksum.  If buf is Z_NULL, this function returns the
1473   required initial value for the checksum.
1474
1475     An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
1476   much faster.
1477
1478   Usage example:
1479
1480     uLong adler = adler32(0L, Z_NULL, 0);
1481
1482     while (read_buffer(buffer, length) != EOF) {
1483       adler = adler32(adler, buffer, length);
1484     }
1485     if (adler != original_adler) error();
1486*/
1487
1488/*
1489ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2,
1490                                          z_off_t len2));
1491
1492     Combine two Adler-32 checksums into one.  For two sequences of bytes, seq1
1493   and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for
1494   each, adler1 and adler2.  adler32_combine() returns the Adler-32 checksum of
1495   seq1 and seq2 concatenated, requiring only adler1, adler2, and len2.
1496*/
1497
1498ZEXTERN uLong ZEXPORT crc32   OF((uLong crc, const Bytef *buf, uInt len));
1499/*
1500     Update a running CRC-32 with the bytes buf[0..len-1] and return the
1501   updated CRC-32.  If buf is Z_NULL, this function returns the required
1502   initial value for the for the crc.  Pre- and post-conditioning (one's
1503   complement) is performed within this function so it shouldn't be done by the
1504   application.
1505
1506   Usage example:
1507
1508     uLong crc = crc32(0L, Z_NULL, 0);
1509
1510     while (read_buffer(buffer, length) != EOF) {
1511       crc = crc32(crc, buffer, length);
1512     }
1513     if (crc != original_crc) error();
1514*/
1515
1516/*
1517ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2));
1518
1519     Combine two CRC-32 check values into one.  For two sequences of bytes,
1520   seq1 and seq2 with lengths len1 and len2, CRC-32 check values were
1521   calculated for each, crc1 and crc2.  crc32_combine() returns the CRC-32
1522   check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and
1523   len2.
1524*/
1525
1526
1527                        /* various hacks, don't look :) */
1528
1529/* deflateInit and inflateInit are macros to allow checking the zlib version
1530 * and the compiler's view of z_stream:
1531 */
1532ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level,
1533                                     const char *version, int stream_size));
1534ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm,
1535                                     const char *version, int stream_size));
1536ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int  level, int  method,
1537                                      int windowBits, int memLevel,
1538                                      int strategy, const char *version,
1539                                      int stream_size));
1540ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int  windowBits,
1541                                      const char *version, int stream_size));
1542ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,
1543                                         unsigned char FAR *window,
1544                                         const char *version,
1545                                         int stream_size));
1546#define deflateInit(strm, level) \
1547        deflateInit_((strm), (level),       ZLIB_VERSION, sizeof(z_stream))
1548#define inflateInit(strm) \
1549        inflateInit_((strm),                ZLIB_VERSION, sizeof(z_stream))
1550#define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
1551        deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
1552                      (strategy),           ZLIB_VERSION, sizeof(z_stream))
1553#define inflateInit2(strm, windowBits) \
1554        inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))
1555#define inflateBackInit(strm, windowBits, window) \
1556        inflateBackInit_((strm), (windowBits), (window), \
1557                                            ZLIB_VERSION, sizeof(z_stream))
1558
1559#ifdef _LARGEFILE64_SOURCE
1560   ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
1561   ZEXTERN off64_t ZEXPORT gzseek64 OF((gzFile, off64_t, int));
1562   ZEXTERN off64_t ZEXPORT gztell64 OF((gzFile));
1563   ZEXTERN off64_t ZEXPORT gzoffset64 OF((gzFile));
1564   ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, off64_t));
1565   ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, off64_t));
1566#endif
1567
1568#if !defined(ZLIB_INTERNAL) && _FILE_OFFSET_BITS == 64
1569#  define gzopen gzopen64
1570#  define gzseek gzseek64
1571#  define gztell gztell64
1572#  define gzoffset gzoffset64
1573#  define adler32_combine adler32_combine64
1574#  define crc32_combine crc32_combine64
1575#  ifndef _LARGEFILE64_SOURCE
1576     ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
1577     ZEXTERN off_t ZEXPORT gzseek64 OF((gzFile, off_t, int));
1578     ZEXTERN off_t ZEXPORT gztell64 OF((gzFile));
1579     ZEXTERN off_t ZEXPORT gzoffset64 OF((gzFile));
1580     ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, off_t));
1581     ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, off_t));
1582#  endif
1583#else
1584   ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *));
1585   ZEXTERN z_off_t ZEXPORT gzseek OF((gzFile, z_off_t, int));
1586   ZEXTERN z_off_t ZEXPORT gztell OF((gzFile));
1587   ZEXTERN z_off_t ZEXPORT gzoffset OF((gzFile));
1588   ZEXTERN uLong ZEXPORT adler32_combine OF((uLong, uLong, z_off_t));
1589   ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
1590#endif
1591
1592#if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL)
1593    struct internal_state {int dummy;}; /* hack for buggy compilers */
1594#endif
1595
1596ZEXTERN const char   * ZEXPORT zError           OF((int));
1597ZEXTERN int            ZEXPORT inflateSyncPoint OF((z_streamp));
1598ZEXTERN const uLongf * ZEXPORT get_crc_table    OF((void));
1599ZEXTERN int            ZEXPORT inflateUndermine OF((z_streamp, int));
1600
1601#ifdef __cplusplus
1602}
1603#endif
1604
1605#endif /* ZLIB_H */
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