1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/libs/zlib/zlib.h	Thu Sep 08 06:28:38 2011 +0300
     1.3 @@ -0,0 +1,1357 @@
     1.4 +/* zlib.h -- interface of the 'zlib' general purpose compression library
     1.5 +  version 1.2.3, July 18th, 2005
     1.6 +
     1.7 +  Copyright (C) 1995-2005 Jean-loup Gailly and Mark Adler
     1.8 +
     1.9 +  This software is provided 'as-is', without any express or implied
    1.10 +  warranty.  In no event will the authors be held liable for any damages
    1.11 +  arising from the use of this software.
    1.12 +
    1.13 +  Permission is granted to anyone to use this software for any purpose,
    1.14 +  including commercial applications, and to alter it and redistribute it
    1.15 +  freely, subject to the following restrictions:
    1.16 +
    1.17 +  1. The origin of this software must not be misrepresented; you must not
    1.18 +     claim that you wrote the original software. If you use this software
    1.19 +     in a product, an acknowledgment in the product documentation would be
    1.20 +     appreciated but is not required.
    1.21 +  2. Altered source versions must be plainly marked as such, and must not be
    1.22 +     misrepresented as being the original software.
    1.23 +  3. This notice may not be removed or altered from any source distribution.
    1.24 +
    1.25 +  Jean-loup Gailly        Mark Adler
    1.26 +  jloup@gzip.org          madler@alumni.caltech.edu
    1.27 +
    1.28 +
    1.29 +  The data format used by the zlib library is described by RFCs (Request for
    1.30 +  Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt
    1.31 +  (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format).
    1.32 +*/
    1.33 +
    1.34 +#ifndef ZLIB_H
    1.35 +#define ZLIB_H
    1.36 +
    1.37 +#include "zconf.h"
    1.38 +
    1.39 +#ifdef __cplusplus
    1.40 +extern "C" {
    1.41 +#endif
    1.42 +
    1.43 +#define ZLIB_VERSION "1.2.3"
    1.44 +#define ZLIB_VERNUM 0x1230
    1.45 +
    1.46 +/*
    1.47 +     The 'zlib' compression library provides in-memory compression and
    1.48 +  decompression functions, including integrity checks of the uncompressed
    1.49 +  data.  This version of the library supports only one compression method
    1.50 +  (deflation) but other algorithms will be added later and will have the same
    1.51 +  stream interface.
    1.52 +
    1.53 +     Compression can be done in a single step if the buffers are large
    1.54 +  enough (for example if an input file is mmap'ed), or can be done by
    1.55 +  repeated calls of the compression function.  In the latter case, the
    1.56 +  application must provide more input and/or consume the output
    1.57 +  (providing more output space) before each call.
    1.58 +
    1.59 +     The compressed data format used by default by the in-memory functions is
    1.60 +  the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped
    1.61 +  around a deflate stream, which is itself documented in RFC 1951.
    1.62 +
    1.63 +     The library also supports reading and writing files in gzip (.gz) format
    1.64 +  with an interface similar to that of stdio using the functions that start
    1.65 +  with "gz".  The gzip format is different from the zlib format.  gzip is a
    1.66 +  gzip wrapper, documented in RFC 1952, wrapped around a deflate stream.
    1.67 +
    1.68 +     This library can optionally read and write gzip streams in memory as well.
    1.69 +
    1.70 +     The zlib format was designed to be compact and fast for use in memory
    1.71 +  and on communications channels.  The gzip format was designed for single-
    1.72 +  file compression on file systems, has a larger header than zlib to maintain
    1.73 +  directory information, and uses a different, slower check method than zlib.
    1.74 +
    1.75 +     The library does not install any signal handler. The decoder checks
    1.76 +  the consistency of the compressed data, so the library should never
    1.77 +  crash even in case of corrupted input.
    1.78 +*/
    1.79 +
    1.80 +typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
    1.81 +typedef void   (*free_func)  OF((voidpf opaque, voidpf address));
    1.82 +
    1.83 +struct internal_state;
    1.84 +
    1.85 +typedef struct z_stream_s {
    1.86 +    Bytef    *next_in;  /* next input byte */
    1.87 +    uInt     avail_in;  /* number of bytes available at next_in */
    1.88 +    uLong    total_in;  /* total nb of input bytes read so far */
    1.89 +
    1.90 +    Bytef    *next_out; /* next output byte should be put there */
    1.91 +    uInt     avail_out; /* remaining free space at next_out */
    1.92 +    uLong    total_out; /* total nb of bytes output so far */
    1.93 +
    1.94 +    char     *msg;      /* last error message, NULL if no error */
    1.95 +    struct internal_state FAR *state; /* not visible by applications */
    1.96 +
    1.97 +    alloc_func zalloc;  /* used to allocate the internal state */
    1.98 +    free_func  zfree;   /* used to free the internal state */
    1.99 +    voidpf     opaque;  /* private data object passed to zalloc and zfree */
   1.100 +
   1.101 +    int     data_type;  /* best guess about the data type: binary or text */
   1.102 +    uLong   adler;      /* adler32 value of the uncompressed data */
   1.103 +    uLong   reserved;   /* reserved for future use */
   1.104 +} z_stream;
   1.105 +
   1.106 +typedef z_stream FAR *z_streamp;
   1.107 +
   1.108 +/*
   1.109 +     gzip header information passed to and from zlib routines.  See RFC 1952
   1.110 +  for more details on the meanings of these fields.
   1.111 +*/
   1.112 +typedef struct gz_header_s {
   1.113 +    int     text;       /* true if compressed data believed to be text */
   1.114 +    uLong   time;       /* modification time */
   1.115 +    int     xflags;     /* extra flags (not used when writing a gzip file) */
   1.116 +    int     os;         /* operating system */
   1.117 +    Bytef   *extra;     /* pointer to extra field or Z_NULL if none */
   1.118 +    uInt    extra_len;  /* extra field length (valid if extra != Z_NULL) */
   1.119 +    uInt    extra_max;  /* space at extra (only when reading header) */
   1.120 +    Bytef   *name;      /* pointer to zero-terminated file name or Z_NULL */
   1.121 +    uInt    name_max;   /* space at name (only when reading header) */
   1.122 +    Bytef   *comment;   /* pointer to zero-terminated comment or Z_NULL */
   1.123 +    uInt    comm_max;   /* space at comment (only when reading header) */
   1.124 +    int     hcrc;       /* true if there was or will be a header crc */
   1.125 +    int     done;       /* true when done reading gzip header (not used
   1.126 +                           when writing a gzip file) */
   1.127 +} gz_header;
   1.128 +
   1.129 +typedef gz_header FAR *gz_headerp;
   1.130 +
   1.131 +/*
   1.132 +   The application must update next_in and avail_in when avail_in has
   1.133 +   dropped to zero. It must update next_out and avail_out when avail_out
   1.134 +   has dropped to zero. The application must initialize zalloc, zfree and
   1.135 +   opaque before calling the init function. All other fields are set by the
   1.136 +   compression library and must not be updated by the application.
   1.137 +
   1.138 +   The opaque value provided by the application will be passed as the first
   1.139 +   parameter for calls of zalloc and zfree. This can be useful for custom
   1.140 +   memory management. The compression library attaches no meaning to the
   1.141 +   opaque value.
   1.142 +
   1.143 +   zalloc must return Z_NULL if there is not enough memory for the object.
   1.144 +   If zlib is used in a multi-threaded application, zalloc and zfree must be
   1.145 +   thread safe.
   1.146 +
   1.147 +   On 16-bit systems, the functions zalloc and zfree must be able to allocate
   1.148 +   exactly 65536 bytes, but will not be required to allocate more than this
   1.149 +   if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS,
   1.150 +   pointers returned by zalloc for objects of exactly 65536 bytes *must*
   1.151 +   have their offset normalized to zero. The default allocation function
   1.152 +   provided by this library ensures this (see zutil.c). To reduce memory
   1.153 +   requirements and avoid any allocation of 64K objects, at the expense of
   1.154 +   compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h).
   1.155 +
   1.156 +   The fields total_in and total_out can be used for statistics or
   1.157 +   progress reports. After compression, total_in holds the total size of
   1.158 +   the uncompressed data and may be saved for use in the decompressor
   1.159 +   (particularly if the decompressor wants to decompress everything in
   1.160 +   a single step).
   1.161 +*/
   1.162 +
   1.163 +                        /* constants */
   1.164 +
   1.165 +#define Z_NO_FLUSH      0
   1.166 +#define Z_PARTIAL_FLUSH 1 /* will be removed, use Z_SYNC_FLUSH instead */
   1.167 +#define Z_SYNC_FLUSH    2
   1.168 +#define Z_FULL_FLUSH    3
   1.169 +#define Z_FINISH        4
   1.170 +#define Z_BLOCK         5
   1.171 +/* Allowed flush values; see deflate() and inflate() below for details */
   1.172 +
   1.173 +#define Z_OK            0
   1.174 +#define Z_STREAM_END    1
   1.175 +#define Z_NEED_DICT     2
   1.176 +#define Z_ERRNO        (-1)
   1.177 +#define Z_STREAM_ERROR (-2)
   1.178 +#define Z_DATA_ERROR   (-3)
   1.179 +#define Z_MEM_ERROR    (-4)
   1.180 +#define Z_BUF_ERROR    (-5)
   1.181 +#define Z_VERSION_ERROR (-6)
   1.182 +/* Return codes for the compression/decompression functions. Negative
   1.183 + * values are errors, positive values are used for special but normal events.
   1.184 + */
   1.185 +
   1.186 +#define Z_NO_COMPRESSION         0
   1.187 +#define Z_BEST_SPEED             1
   1.188 +#define Z_BEST_COMPRESSION       9
   1.189 +#define Z_DEFAULT_COMPRESSION  (-1)
   1.190 +/* compression levels */
   1.191 +
   1.192 +#define Z_FILTERED            1
   1.193 +#define Z_HUFFMAN_ONLY        2
   1.194 +#define Z_RLE                 3
   1.195 +#define Z_FIXED               4
   1.196 +#define Z_DEFAULT_STRATEGY    0
   1.197 +/* compression strategy; see deflateInit2() below for details */
   1.198 +
   1.199 +#define Z_BINARY   0
   1.200 +#define Z_TEXT     1
   1.201 +#define Z_ASCII    Z_TEXT   /* for compatibility with 1.2.2 and earlier */
   1.202 +#define Z_UNKNOWN  2
   1.203 +/* Possible values of the data_type field (though see inflate()) */
   1.204 +
   1.205 +#define Z_DEFLATED   8
   1.206 +/* The deflate compression method (the only one supported in this version) */
   1.207 +
   1.208 +#define Z_NULL  0  /* for initializing zalloc, zfree, opaque */
   1.209 +
   1.210 +#define zlib_version zlibVersion()
   1.211 +/* for compatibility with versions < 1.0.2 */
   1.212 +
   1.213 +                        /* basic functions */
   1.214 +
   1.215 +ZEXTERN const char * ZEXPORT zlibVersion OF((void));
   1.216 +/* The application can compare zlibVersion and ZLIB_VERSION for consistency.
   1.217 +   If the first character differs, the library code actually used is
   1.218 +   not compatible with the zlib.h header file used by the application.
   1.219 +   This check is automatically made by deflateInit and inflateInit.
   1.220 + */
   1.221 +
   1.222 +/*
   1.223 +ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level));
   1.224 +
   1.225 +     Initializes the internal stream state for compression. The fields
   1.226 +   zalloc, zfree and opaque must be initialized before by the caller.
   1.227 +   If zalloc and zfree are set to Z_NULL, deflateInit updates them to
   1.228 +   use default allocation functions.
   1.229 +
   1.230 +     The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9:
   1.231 +   1 gives best speed, 9 gives best compression, 0 gives no compression at
   1.232 +   all (the input data is simply copied a block at a time).
   1.233 +   Z_DEFAULT_COMPRESSION requests a default compromise between speed and
   1.234 +   compression (currently equivalent to level 6).
   1.235 +
   1.236 +     deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
   1.237 +   enough memory, Z_STREAM_ERROR if level is not a valid compression level,
   1.238 +   Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible
   1.239 +   with the version assumed by the caller (ZLIB_VERSION).
   1.240 +   msg is set to null if there is no error message.  deflateInit does not
   1.241 +   perform any compression: this will be done by deflate().
   1.242 +*/
   1.243 +
   1.244 +
   1.245 +ZEXTERN int ZEXPORT deflate OF((z_streamp strm, int flush));
   1.246 +/*
   1.247 +    deflate compresses as much data as possible, and stops when the input
   1.248 +  buffer becomes empty or the output buffer becomes full. It may introduce some
   1.249 +  output latency (reading input without producing any output) except when
   1.250 +  forced to flush.
   1.251 +
   1.252 +    The detailed semantics are as follows. deflate performs one or both of the
   1.253 +  following actions:
   1.254 +
   1.255 +  - Compress more input starting at next_in and update next_in and avail_in
   1.256 +    accordingly. If not all input can be processed (because there is not
   1.257 +    enough room in the output buffer), next_in and avail_in are updated and
   1.258 +    processing will resume at this point for the next call of deflate().
   1.259 +
   1.260 +  - Provide more output starting at next_out and update next_out and avail_out
   1.261 +    accordingly. This action is forced if the parameter flush is non zero.
   1.262 +    Forcing flush frequently degrades the compression ratio, so this parameter
   1.263 +    should be set only when necessary (in interactive applications).
   1.264 +    Some output may be provided even if flush is not set.
   1.265 +
   1.266 +  Before the call of deflate(), the application should ensure that at least
   1.267 +  one of the actions is possible, by providing more input and/or consuming
   1.268 +  more output, and updating avail_in or avail_out accordingly; avail_out
   1.269 +  should never be zero before the call. The application can consume the
   1.270 +  compressed output when it wants, for example when the output buffer is full
   1.271 +  (avail_out == 0), or after each call of deflate(). If deflate returns Z_OK
   1.272 +  and with zero avail_out, it must be called again after making room in the
   1.273 +  output buffer because there might be more output pending.
   1.274 +
   1.275 +    Normally the parameter flush is set to Z_NO_FLUSH, which allows deflate to
   1.276 +  decide how much data to accumualte before producing output, in order to
   1.277 +  maximize compression.
   1.278 +
   1.279 +    If the parameter flush is set to Z_SYNC_FLUSH, all pending output is
   1.280 +  flushed to the output buffer and the output is aligned on a byte boundary, so
   1.281 +  that the decompressor can get all input data available so far. (In particular
   1.282 +  avail_in is zero after the call if enough output space has been provided
   1.283 +  before the call.)  Flushing may degrade compression for some compression
   1.284 +  algorithms and so it should be used only when necessary.
   1.285 +
   1.286 +    If flush is set to Z_FULL_FLUSH, all output is flushed as with
   1.287 +  Z_SYNC_FLUSH, and the compression state is reset so that decompression can
   1.288 +  restart from this point if previous compressed data has been damaged or if
   1.289 +  random access is desired. Using Z_FULL_FLUSH too often can seriously degrade
   1.290 +  compression.
   1.291 +
   1.292 +    If deflate returns with avail_out == 0, this function must be called again
   1.293 +  with the same value of the flush parameter and more output space (updated
   1.294 +  avail_out), until the flush is complete (deflate returns with non-zero
   1.295 +  avail_out). In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that
   1.296 +  avail_out is greater than six to avoid repeated flush markers due to
   1.297 +  avail_out == 0 on return.
   1.298 +
   1.299 +    If the parameter flush is set to Z_FINISH, pending input is processed,
   1.300 +  pending output is flushed and deflate returns with Z_STREAM_END if there
   1.301 +  was enough output space; if deflate returns with Z_OK, this function must be
   1.302 +  called again with Z_FINISH and more output space (updated avail_out) but no
   1.303 +  more input data, until it returns with Z_STREAM_END or an error. After
   1.304 +  deflate has returned Z_STREAM_END, the only possible operations on the
   1.305 +  stream are deflateReset or deflateEnd.
   1.306 +
   1.307 +    Z_FINISH can be used immediately after deflateInit if all the compression
   1.308 +  is to be done in a single step. In this case, avail_out must be at least
   1.309 +  the value returned by deflateBound (see below). If deflate does not return
   1.310 +  Z_STREAM_END, then it must be called again as described above.
   1.311 +
   1.312 +    deflate() sets strm->adler to the adler32 checksum of all input read
   1.313 +  so far (that is, total_in bytes).
   1.314 +
   1.315 +    deflate() may update strm->data_type if it can make a good guess about
   1.316 +  the input data type (Z_BINARY or Z_TEXT). In doubt, the data is considered
   1.317 +  binary. This field is only for information purposes and does not affect
   1.318 +  the compression algorithm in any manner.
   1.319 +
   1.320 +    deflate() returns Z_OK if some progress has been made (more input
   1.321 +  processed or more output produced), Z_STREAM_END if all input has been
   1.322 +  consumed and all output has been produced (only when flush is set to
   1.323 +  Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example
   1.324 +  if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible
   1.325 +  (for example avail_in or avail_out was zero). Note that Z_BUF_ERROR is not
   1.326 +  fatal, and deflate() can be called again with more input and more output
   1.327 +  space to continue compressing.
   1.328 +*/
   1.329 +
   1.330 +
   1.331 +ZEXTERN int ZEXPORT deflateEnd OF((z_streamp strm));
   1.332 +/*
   1.333 +     All dynamically allocated data structures for this stream are freed.
   1.334 +   This function discards any unprocessed input and does not flush any
   1.335 +   pending output.
   1.336 +
   1.337 +     deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the
   1.338 +   stream state was inconsistent, Z_DATA_ERROR if the stream was freed
   1.339 +   prematurely (some input or output was discarded). In the error case,
   1.340 +   msg may be set but then points to a static string (which must not be
   1.341 +   deallocated).
   1.342 +*/
   1.343 +
   1.344 +
   1.345 +/*
   1.346 +ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm));
   1.347 +
   1.348 +     Initializes the internal stream state for decompression. The fields
   1.349 +   next_in, avail_in, zalloc, zfree and opaque must be initialized before by
   1.350 +   the caller. If next_in is not Z_NULL and avail_in is large enough (the exact
   1.351 +   value depends on the compression method), inflateInit determines the
   1.352 +   compression method from the zlib header and allocates all data structures
   1.353 +   accordingly; otherwise the allocation will be deferred to the first call of
   1.354 +   inflate.  If zalloc and zfree are set to Z_NULL, inflateInit updates them to
   1.355 +   use default allocation functions.
   1.356 +
   1.357 +     inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
   1.358 +   memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
   1.359 +   version assumed by the caller.  msg is set to null if there is no error
   1.360 +   message. inflateInit does not perform any decompression apart from reading
   1.361 +   the zlib header if present: this will be done by inflate().  (So next_in and
   1.362 +   avail_in may be modified, but next_out and avail_out are unchanged.)
   1.363 +*/
   1.364 +
   1.365 +
   1.366 +ZEXTERN int ZEXPORT inflate OF((z_streamp strm, int flush));
   1.367 +/*
   1.368 +    inflate decompresses as much data as possible, and stops when the input
   1.369 +  buffer becomes empty or the output buffer becomes full. It may introduce
   1.370 +  some output latency (reading input without producing any output) except when
   1.371 +  forced to flush.
   1.372 +
   1.373 +  The detailed semantics are as follows. inflate performs one or both of the
   1.374 +  following actions:
   1.375 +
   1.376 +  - Decompress more input starting at next_in and update next_in and avail_in
   1.377 +    accordingly. If not all input can be processed (because there is not
   1.378 +    enough room in the output buffer), next_in is updated and processing
   1.379 +    will resume at this point for the next call of inflate().
   1.380 +
   1.381 +  - Provide more output starting at next_out and update next_out and avail_out
   1.382 +    accordingly.  inflate() provides as much output as possible, until there
   1.383 +    is no more input data or no more space in the output buffer (see below
   1.384 +    about the flush parameter).
   1.385 +
   1.386 +  Before the call of inflate(), the application should ensure that at least
   1.387 +  one of the actions is possible, by providing more input and/or consuming
   1.388 +  more output, and updating the next_* and avail_* values accordingly.
   1.389 +  The application can consume the uncompressed output when it wants, for
   1.390 +  example when the output buffer is full (avail_out == 0), or after each
   1.391 +  call of inflate(). If inflate returns Z_OK and with zero avail_out, it
   1.392 +  must be called again after making room in the output buffer because there
   1.393 +  might be more output pending.
   1.394 +
   1.395 +    The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH,
   1.396 +  Z_FINISH, or Z_BLOCK. Z_SYNC_FLUSH requests that inflate() flush as much
   1.397 +  output as possible to the output buffer. Z_BLOCK requests that inflate() stop
   1.398 +  if and when it gets to the next deflate block boundary. When decoding the
   1.399 +  zlib or gzip format, this will cause inflate() to return immediately after
   1.400 +  the header and before the first block. When doing a raw inflate, inflate()
   1.401 +  will go ahead and process the first block, and will return when it gets to
   1.402 +  the end of that block, or when it runs out of data.
   1.403 +
   1.404 +    The Z_BLOCK option assists in appending to or combining deflate streams.
   1.405 +  Also to assist in this, on return inflate() will set strm->data_type to the
   1.406 +  number of unused bits in the last byte taken from strm->next_in, plus 64
   1.407 +  if inflate() is currently decoding the last block in the deflate stream,
   1.408 +  plus 128 if inflate() returned immediately after decoding an end-of-block
   1.409 +  code or decoding the complete header up to just before the first byte of the
   1.410 +  deflate stream. The end-of-block will not be indicated until all of the
   1.411 +  uncompressed data from that block has been written to strm->next_out.  The
   1.412 +  number of unused bits may in general be greater than seven, except when
   1.413 +  bit 7 of data_type is set, in which case the number of unused bits will be
   1.414 +  less than eight.
   1.415 +
   1.416 +    inflate() should normally be called until it returns Z_STREAM_END or an
   1.417 +  error. However if all decompression is to be performed in a single step
   1.418 +  (a single call of inflate), the parameter flush should be set to
   1.419 +  Z_FINISH. In this case all pending input is processed and all pending
   1.420 +  output is flushed; avail_out must be large enough to hold all the
   1.421 +  uncompressed data. (The size of the uncompressed data may have been saved
   1.422 +  by the compressor for this purpose.) The next operation on this stream must
   1.423 +  be inflateEnd to deallocate the decompression state. The use of Z_FINISH
   1.424 +  is never required, but can be used to inform inflate that a faster approach
   1.425 +  may be used for the single inflate() call.
   1.426 +
   1.427 +     In this implementation, inflate() always flushes as much output as
   1.428 +  possible to the output buffer, and always uses the faster approach on the
   1.429 +  first call. So the only effect of the flush parameter in this implementation
   1.430 +  is on the return value of inflate(), as noted below, or when it returns early
   1.431 +  because Z_BLOCK is used.
   1.432 +
   1.433 +     If a preset dictionary is needed after this call (see inflateSetDictionary
   1.434 +  below), inflate sets strm->adler to the adler32 checksum of the dictionary
   1.435 +  chosen by the compressor and returns Z_NEED_DICT; otherwise it sets
   1.436 +  strm->adler to the adler32 checksum of all output produced so far (that is,
   1.437 +  total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described
   1.438 +  below. At the end of the stream, inflate() checks that its computed adler32
   1.439 +  checksum is equal to that saved by the compressor and returns Z_STREAM_END
   1.440 +  only if the checksum is correct.
   1.441 +
   1.442 +    inflate() will decompress and check either zlib-wrapped or gzip-wrapped
   1.443 +  deflate data.  The header type is detected automatically.  Any information
   1.444 +  contained in the gzip header is not retained, so applications that need that
   1.445 +  information should instead use raw inflate, see inflateInit2() below, or
   1.446 +  inflateBack() and perform their own processing of the gzip header and
   1.447 +  trailer.
   1.448 +
   1.449 +    inflate() returns Z_OK if some progress has been made (more input processed
   1.450 +  or more output produced), Z_STREAM_END if the end of the compressed data has
   1.451 +  been reached and all uncompressed output has been produced, Z_NEED_DICT if a
   1.452 +  preset dictionary is needed at this point, Z_DATA_ERROR if the input data was
   1.453 +  corrupted (input stream not conforming to the zlib format or incorrect check
   1.454 +  value), Z_STREAM_ERROR if the stream structure was inconsistent (for example
   1.455 +  if next_in or next_out was NULL), Z_MEM_ERROR if there was not enough memory,
   1.456 +  Z_BUF_ERROR if no progress is possible or if there was not enough room in the
   1.457 +  output buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and
   1.458 +  inflate() can be called again with more input and more output space to
   1.459 +  continue decompressing. If Z_DATA_ERROR is returned, the application may then
   1.460 +  call inflateSync() to look for a good compression block if a partial recovery
   1.461 +  of the data is desired.
   1.462 +*/
   1.463 +
   1.464 +
   1.465 +ZEXTERN int ZEXPORT inflateEnd OF((z_streamp strm));
   1.466 +/*
   1.467 +     All dynamically allocated data structures for this stream are freed.
   1.468 +   This function discards any unprocessed input and does not flush any
   1.469 +   pending output.
   1.470 +
   1.471 +     inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state
   1.472 +   was inconsistent. In the error case, msg may be set but then points to a
   1.473 +   static string (which must not be deallocated).
   1.474 +*/
   1.475 +
   1.476 +                        /* Advanced functions */
   1.477 +
   1.478 +/*
   1.479 +    The following functions are needed only in some special applications.
   1.480 +*/
   1.481 +
   1.482 +/*
   1.483 +ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm,
   1.484 +                                     int  level,
   1.485 +                                     int  method,
   1.486 +                                     int  windowBits,
   1.487 +                                     int  memLevel,
   1.488 +                                     int  strategy));
   1.489 +
   1.490 +     This is another version of deflateInit with more compression options. The
   1.491 +   fields next_in, zalloc, zfree and opaque must be initialized before by
   1.492 +   the caller.
   1.493 +
   1.494 +     The method parameter is the compression method. It must be Z_DEFLATED in
   1.495 +   this version of the library.
   1.496 +
   1.497 +     The windowBits parameter is the base two logarithm of the window size
   1.498 +   (the size of the history buffer). It should be in the range 8..15 for this
   1.499 +   version of the library. Larger values of this parameter result in better
   1.500 +   compression at the expense of memory usage. The default value is 15 if
   1.501 +   deflateInit is used instead.
   1.502 +
   1.503 +     windowBits can also be -8..-15 for raw deflate. In this case, -windowBits
   1.504 +   determines the window size. deflate() will then generate raw deflate data
   1.505 +   with no zlib header or trailer, and will not compute an adler32 check value.
   1.506 +
   1.507 +     windowBits can also be greater than 15 for optional gzip encoding. Add
   1.508 +   16 to windowBits to write a simple gzip header and trailer around the
   1.509 +   compressed data instead of a zlib wrapper. The gzip header will have no
   1.510 +   file name, no extra data, no comment, no modification time (set to zero),
   1.511 +   no header crc, and the operating system will be set to 255 (unknown).  If a
   1.512 +   gzip stream is being written, strm->adler is a crc32 instead of an adler32.
   1.513 +
   1.514 +     The memLevel parameter specifies how much memory should be allocated
   1.515 +   for the internal compression state. memLevel=1 uses minimum memory but
   1.516 +   is slow and reduces compression ratio; memLevel=9 uses maximum memory
   1.517 +   for optimal speed. The default value is 8. See zconf.h for total memory
   1.518 +   usage as a function of windowBits and memLevel.
   1.519 +
   1.520 +     The strategy parameter is used to tune the compression algorithm. Use the
   1.521 +   value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a
   1.522 +   filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no
   1.523 +   string match), or Z_RLE to limit match distances to one (run-length
   1.524 +   encoding). Filtered data consists mostly of small values with a somewhat
   1.525 +   random distribution. In this case, the compression algorithm is tuned to
   1.526 +   compress them better. The effect of Z_FILTERED is to force more Huffman
   1.527 +   coding and less string matching; it is somewhat intermediate between
   1.528 +   Z_DEFAULT and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as fast as
   1.529 +   Z_HUFFMAN_ONLY, but give better compression for PNG image data. The strategy
   1.530 +   parameter only affects the compression ratio but not the correctness of the
   1.531 +   compressed output even if it is not set appropriately.  Z_FIXED prevents the
   1.532 +   use of dynamic Huffman codes, allowing for a simpler decoder for special
   1.533 +   applications.
   1.534 +
   1.535 +      deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
   1.536 +   memory, Z_STREAM_ERROR if a parameter is invalid (such as an invalid
   1.537 +   method). msg is set to null if there is no error message.  deflateInit2 does
   1.538 +   not perform any compression: this will be done by deflate().
   1.539 +*/
   1.540 +
   1.541 +ZEXTERN int ZEXPORT deflateSetDictionary OF((z_streamp strm,
   1.542 +                                             const Bytef *dictionary,
   1.543 +                                             uInt  dictLength));
   1.544 +/*
   1.545 +     Initializes the compression dictionary from the given byte sequence
   1.546 +   without producing any compressed output. This function must be called
   1.547 +   immediately after deflateInit, deflateInit2 or deflateReset, before any
   1.548 +   call of deflate. The compressor and decompressor must use exactly the same
   1.549 +   dictionary (see inflateSetDictionary).
   1.550 +
   1.551 +     The dictionary should consist of strings (byte sequences) that are likely
   1.552 +   to be encountered later in the data to be compressed, with the most commonly
   1.553 +   used strings preferably put towards the end of the dictionary. Using a
   1.554 +   dictionary is most useful when the data to be compressed is short and can be
   1.555 +   predicted with good accuracy; the data can then be compressed better than
   1.556 +   with the default empty dictionary.
   1.557 +
   1.558 +     Depending on the size of the compression data structures selected by
   1.559 +   deflateInit or deflateInit2, a part of the dictionary may in effect be
   1.560 +   discarded, for example if the dictionary is larger than the window size in
   1.561 +   deflate or deflate2. Thus the strings most likely to be useful should be
   1.562 +   put at the end of the dictionary, not at the front. In addition, the
   1.563 +   current implementation of deflate will use at most the window size minus
   1.564 +   262 bytes of the provided dictionary.
   1.565 +
   1.566 +     Upon return of this function, strm->adler is set to the adler32 value
   1.567 +   of the dictionary; the decompressor may later use this value to determine
   1.568 +   which dictionary has been used by the compressor. (The adler32 value
   1.569 +   applies to the whole dictionary even if only a subset of the dictionary is
   1.570 +   actually used by the compressor.) If a raw deflate was requested, then the
   1.571 +   adler32 value is not computed and strm->adler is not set.
   1.572 +
   1.573 +     deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a
   1.574 +   parameter is invalid (such as NULL dictionary) or the stream state is
   1.575 +   inconsistent (for example if deflate has already been called for this stream
   1.576 +   or if the compression method is bsort). deflateSetDictionary does not
   1.577 +   perform any compression: this will be done by deflate().
   1.578 +*/
   1.579 +
   1.580 +ZEXTERN int ZEXPORT deflateCopy OF((z_streamp dest,
   1.581 +                                    z_streamp source));
   1.582 +/*
   1.583 +     Sets the destination stream as a complete copy of the source stream.
   1.584 +
   1.585 +     This function can be useful when several compression strategies will be
   1.586 +   tried, for example when there are several ways of pre-processing the input
   1.587 +   data with a filter. The streams that will be discarded should then be freed
   1.588 +   by calling deflateEnd.  Note that deflateCopy duplicates the internal
   1.589 +   compression state which can be quite large, so this strategy is slow and
   1.590 +   can consume lots of memory.
   1.591 +
   1.592 +     deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
   1.593 +   enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
   1.594 +   (such as zalloc being NULL). msg is left unchanged in both source and
   1.595 +   destination.
   1.596 +*/
   1.597 +
   1.598 +ZEXTERN int ZEXPORT deflateReset OF((z_streamp strm));
   1.599 +/*
   1.600 +     This function is equivalent to deflateEnd followed by deflateInit,
   1.601 +   but does not free and reallocate all the internal compression state.
   1.602 +   The stream will keep the same compression level and any other attributes
   1.603 +   that may have been set by deflateInit2.
   1.604 +
   1.605 +      deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
   1.606 +   stream state was inconsistent (such as zalloc or state being NULL).
   1.607 +*/
   1.608 +
   1.609 +ZEXTERN int ZEXPORT deflateParams OF((z_streamp strm,
   1.610 +                                      int level,
   1.611 +                                      int strategy));
   1.612 +/*
   1.613 +     Dynamically update the compression level and compression strategy.  The
   1.614 +   interpretation of level and strategy is as in deflateInit2.  This can be
   1.615 +   used to switch between compression and straight copy of the input data, or
   1.616 +   to switch to a different kind of input data requiring a different
   1.617 +   strategy. If the compression level is changed, the input available so far
   1.618 +   is compressed with the old level (and may be flushed); the new level will
   1.619 +   take effect only at the next call of deflate().
   1.620 +
   1.621 +     Before the call of deflateParams, the stream state must be set as for
   1.622 +   a call of deflate(), since the currently available input may have to
   1.623 +   be compressed and flushed. In particular, strm->avail_out must be non-zero.
   1.624 +
   1.625 +     deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source
   1.626 +   stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR
   1.627 +   if strm->avail_out was zero.
   1.628 +*/
   1.629 +
   1.630 +ZEXTERN int ZEXPORT deflateTune OF((z_streamp strm,
   1.631 +                                    int good_length,
   1.632 +                                    int max_lazy,
   1.633 +                                    int nice_length,
   1.634 +                                    int max_chain));
   1.635 +/*
   1.636 +     Fine tune deflate's internal compression parameters.  This should only be
   1.637 +   used by someone who understands the algorithm used by zlib's deflate for
   1.638 +   searching for the best matching string, and even then only by the most
   1.639 +   fanatic optimizer trying to squeeze out the last compressed bit for their
   1.640 +   specific input data.  Read the deflate.c source code for the meaning of the
   1.641 +   max_lazy, good_length, nice_length, and max_chain parameters.
   1.642 +
   1.643 +     deflateTune() can be called after deflateInit() or deflateInit2(), and
   1.644 +   returns Z_OK on success, or Z_STREAM_ERROR for an invalid deflate stream.
   1.645 + */
   1.646 +
   1.647 +ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm,
   1.648 +                                       uLong sourceLen));
   1.649 +/*
   1.650 +     deflateBound() returns an upper bound on the compressed size after
   1.651 +   deflation of sourceLen bytes.  It must be called after deflateInit()
   1.652 +   or deflateInit2().  This would be used to allocate an output buffer
   1.653 +   for deflation in a single pass, and so would be called before deflate().
   1.654 +*/
   1.655 +
   1.656 +ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm,
   1.657 +                                     int bits,
   1.658 +                                     int value));
   1.659 +/*
   1.660 +     deflatePrime() inserts bits in the deflate output stream.  The intent
   1.661 +  is that this function is used to start off the deflate output with the
   1.662 +  bits leftover from a previous deflate stream when appending to it.  As such,
   1.663 +  this function can only be used for raw deflate, and must be used before the
   1.664 +  first deflate() call after a deflateInit2() or deflateReset().  bits must be
   1.665 +  less than or equal to 16, and that many of the least significant bits of
   1.666 +  value will be inserted in the output.
   1.667 +
   1.668 +      deflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source
   1.669 +   stream state was inconsistent.
   1.670 +*/
   1.671 +
   1.672 +ZEXTERN int ZEXPORT deflateSetHeader OF((z_streamp strm,
   1.673 +                                         gz_headerp head));
   1.674 +/*
   1.675 +      deflateSetHeader() provides gzip header information for when a gzip
   1.676 +   stream is requested by deflateInit2().  deflateSetHeader() may be called
   1.677 +   after deflateInit2() or deflateReset() and before the first call of
   1.678 +   deflate().  The text, time, os, extra field, name, and comment information
   1.679 +   in the provided gz_header structure are written to the gzip header (xflag is
   1.680 +   ignored -- the extra flags are set according to the compression level).  The
   1.681 +   caller must assure that, if not Z_NULL, name and comment are terminated with
   1.682 +   a zero byte, and that if extra is not Z_NULL, that extra_len bytes are
   1.683 +   available there.  If hcrc is true, a gzip header crc is included.  Note that
   1.684 +   the current versions of the command-line version of gzip (up through version
   1.685 +   1.3.x) do not support header crc's, and will report that it is a "multi-part
   1.686 +   gzip file" and give up.
   1.687 +
   1.688 +      If deflateSetHeader is not used, the default gzip header has text false,
   1.689 +   the time set to zero, and os set to 255, with no extra, name, or comment
   1.690 +   fields.  The gzip header is returned to the default state by deflateReset().
   1.691 +
   1.692 +      deflateSetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
   1.693 +   stream state was inconsistent.
   1.694 +*/
   1.695 +
   1.696 +/*
   1.697 +ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,
   1.698 +                                     int  windowBits));
   1.699 +
   1.700 +     This is another version of inflateInit with an extra parameter. The
   1.701 +   fields next_in, avail_in, zalloc, zfree and opaque must be initialized
   1.702 +   before by the caller.
   1.703 +
   1.704 +     The windowBits parameter is the base two logarithm of the maximum window
   1.705 +   size (the size of the history buffer).  It should be in the range 8..15 for
   1.706 +   this version of the library. The default value is 15 if inflateInit is used
   1.707 +   instead. windowBits must be greater than or equal to the windowBits value
   1.708 +   provided to deflateInit2() while compressing, or it must be equal to 15 if
   1.709 +   deflateInit2() was not used. If a compressed stream with a larger window
   1.710 +   size is given as input, inflate() will return with the error code
   1.711 +   Z_DATA_ERROR instead of trying to allocate a larger window.
   1.712 +
   1.713 +     windowBits can also be -8..-15 for raw inflate. In this case, -windowBits
   1.714 +   determines the window size. inflate() will then process raw deflate data,
   1.715 +   not looking for a zlib or gzip header, not generating a check value, and not
   1.716 +   looking for any check values for comparison at the end of the stream. This
   1.717 +   is for use with other formats that use the deflate compressed data format
   1.718 +   such as zip.  Those formats provide their own check values. If a custom
   1.719 +   format is developed using the raw deflate format for compressed data, it is
   1.720 +   recommended that a check value such as an adler32 or a crc32 be applied to
   1.721 +   the uncompressed data as is done in the zlib, gzip, and zip formats.  For
   1.722 +   most applications, the zlib format should be used as is. Note that comments
   1.723 +   above on the use in deflateInit2() applies to the magnitude of windowBits.
   1.724 +
   1.725 +     windowBits can also be greater than 15 for optional gzip decoding. Add
   1.726 +   32 to windowBits to enable zlib and gzip decoding with automatic header
   1.727 +   detection, or add 16 to decode only the gzip format (the zlib format will
   1.728 +   return a Z_DATA_ERROR).  If a gzip stream is being decoded, strm->adler is
   1.729 +   a crc32 instead of an adler32.
   1.730 +
   1.731 +     inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
   1.732 +   memory, Z_STREAM_ERROR if a parameter is invalid (such as a null strm). msg
   1.733 +   is set to null if there is no error message.  inflateInit2 does not perform
   1.734 +   any decompression apart from reading the zlib header if present: this will
   1.735 +   be done by inflate(). (So next_in and avail_in may be modified, but next_out
   1.736 +   and avail_out are unchanged.)
   1.737 +*/
   1.738 +
   1.739 +ZEXTERN int ZEXPORT inflateSetDictionary OF((z_streamp strm,
   1.740 +                                             const Bytef *dictionary,
   1.741 +                                             uInt  dictLength));
   1.742 +/*
   1.743 +     Initializes the decompression dictionary from the given uncompressed byte
   1.744 +   sequence. This function must be called immediately after a call of inflate,
   1.745 +   if that call returned Z_NEED_DICT. The dictionary chosen by the compressor
   1.746 +   can be determined from the adler32 value returned by that call of inflate.
   1.747 +   The compressor and decompressor must use exactly the same dictionary (see
   1.748 +   deflateSetDictionary).  For raw inflate, this function can be called
   1.749 +   immediately after inflateInit2() or inflateReset() and before any call of
   1.750 +   inflate() to set the dictionary.  The application must insure that the
   1.751 +   dictionary that was used for compression is provided.
   1.752 +
   1.753 +     inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
   1.754 +   parameter is invalid (such as NULL dictionary) or the stream state is
   1.755 +   inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the
   1.756 +   expected one (incorrect adler32 value). inflateSetDictionary does not
   1.757 +   perform any decompression: this will be done by subsequent calls of
   1.758 +   inflate().
   1.759 +*/
   1.760 +
   1.761 +ZEXTERN int ZEXPORT inflateSync OF((z_streamp strm));
   1.762 +/*
   1.763 +    Skips invalid compressed data until a full flush point (see above the
   1.764 +  description of deflate with Z_FULL_FLUSH) can be found, or until all
   1.765 +  available input is skipped. No output is provided.
   1.766 +
   1.767 +    inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR
   1.768 +  if no more input was provided, Z_DATA_ERROR if no flush point has been found,
   1.769 +  or Z_STREAM_ERROR if the stream structure was inconsistent. In the success
   1.770 +  case, the application may save the current current value of total_in which
   1.771 +  indicates where valid compressed data was found. In the error case, the
   1.772 +  application may repeatedly call inflateSync, providing more input each time,
   1.773 +  until success or end of the input data.
   1.774 +*/
   1.775 +
   1.776 +ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest,
   1.777 +                                    z_streamp source));
   1.778 +/*
   1.779 +     Sets the destination stream as a complete copy of the source stream.
   1.780 +
   1.781 +     This function can be useful when randomly accessing a large stream.  The
   1.782 +   first pass through the stream can periodically record the inflate state,
   1.783 +   allowing restarting inflate at those points when randomly accessing the
   1.784 +   stream.
   1.785 +
   1.786 +     inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
   1.787 +   enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
   1.788 +   (such as zalloc being NULL). msg is left unchanged in both source and
   1.789 +   destination.
   1.790 +*/
   1.791 +
   1.792 +ZEXTERN int ZEXPORT inflateReset OF((z_streamp strm));
   1.793 +/*
   1.794 +     This function is equivalent to inflateEnd followed by inflateInit,
   1.795 +   but does not free and reallocate all the internal decompression state.
   1.796 +   The stream will keep attributes that may have been set by inflateInit2.
   1.797 +
   1.798 +      inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
   1.799 +   stream state was inconsistent (such as zalloc or state being NULL).
   1.800 +*/
   1.801 +
   1.802 +ZEXTERN int ZEXPORT inflatePrime OF((z_streamp strm,
   1.803 +                                     int bits,
   1.804 +                                     int value));
   1.805 +/*
   1.806 +     This function inserts bits in the inflate input stream.  The intent is
   1.807 +  that this function is used to start inflating at a bit position in the
   1.808 +  middle of a byte.  The provided bits will be used before any bytes are used
   1.809 +  from next_in.  This function should only be used with raw inflate, and
   1.810 +  should be used before the first inflate() call after inflateInit2() or
   1.811 +  inflateReset().  bits must be less than or equal to 16, and that many of the
   1.812 +  least significant bits of value will be inserted in the input.
   1.813 +
   1.814 +      inflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source
   1.815 +   stream state was inconsistent.
   1.816 +*/
   1.817 +
   1.818 +ZEXTERN int ZEXPORT inflateGetHeader OF((z_streamp strm,
   1.819 +                                         gz_headerp head));
   1.820 +/*
   1.821 +      inflateGetHeader() requests that gzip header information be stored in the
   1.822 +   provided gz_header structure.  inflateGetHeader() may be called after
   1.823 +   inflateInit2() or inflateReset(), and before the first call of inflate().
   1.824 +   As inflate() processes the gzip stream, head->done is zero until the header
   1.825 +   is completed, at which time head->done is set to one.  If a zlib stream is
   1.826 +   being decoded, then head->done is set to -1 to indicate that there will be
   1.827 +   no gzip header information forthcoming.  Note that Z_BLOCK can be used to
   1.828 +   force inflate() to return immediately after header processing is complete
   1.829 +   and before any actual data is decompressed.
   1.830 +
   1.831 +      The text, time, xflags, and os fields are filled in with the gzip header
   1.832 +   contents.  hcrc is set to true if there is a header CRC.  (The header CRC
   1.833 +   was valid if done is set to one.)  If extra is not Z_NULL, then extra_max
   1.834 +   contains the maximum number of bytes to write to extra.  Once done is true,
   1.835 +   extra_len contains the actual extra field length, and extra contains the
   1.836 +   extra field, or that field truncated if extra_max is less than extra_len.
   1.837 +   If name is not Z_NULL, then up to name_max characters are written there,
   1.838 +   terminated with a zero unless the length is greater than name_max.  If
   1.839 +   comment is not Z_NULL, then up to comm_max characters are written there,
   1.840 +   terminated with a zero unless the length is greater than comm_max.  When
   1.841 +   any of extra, name, or comment are not Z_NULL and the respective field is
   1.842 +   not present in the header, then that field is set to Z_NULL to signal its
   1.843 +   absence.  This allows the use of deflateSetHeader() with the returned
   1.844 +   structure to duplicate the header.  However if those fields are set to
   1.845 +   allocated memory, then the application will need to save those pointers
   1.846 +   elsewhere so that they can be eventually freed.
   1.847 +
   1.848 +      If inflateGetHeader is not used, then the header information is simply
   1.849 +   discarded.  The header is always checked for validity, including the header
   1.850 +   CRC if present.  inflateReset() will reset the process to discard the header
   1.851 +   information.  The application would need to call inflateGetHeader() again to
   1.852 +   retrieve the header from the next gzip stream.
   1.853 +
   1.854 +      inflateGetHeader returns Z_OK if success, or Z_STREAM_ERROR if the source
   1.855 +   stream state was inconsistent.
   1.856 +*/
   1.857 +
   1.858 +/*
   1.859 +ZEXTERN int ZEXPORT inflateBackInit OF((z_streamp strm, int windowBits,
   1.860 +                                        unsigned char FAR *window));
   1.861 +
   1.862 +     Initialize the internal stream state for decompression using inflateBack()
   1.863 +   calls.  The fields zalloc, zfree and opaque in strm must be initialized
   1.864 +   before the call.  If zalloc and zfree are Z_NULL, then the default library-
   1.865 +   derived memory allocation routines are used.  windowBits is the base two
   1.866 +   logarithm of the window size, in the range 8..15.  window is a caller
   1.867 +   supplied buffer of that size.  Except for special applications where it is
   1.868 +   assured that deflate was used with small window sizes, windowBits must be 15
   1.869 +   and a 32K byte window must be supplied to be able to decompress general
   1.870 +   deflate streams.
   1.871 +
   1.872 +     See inflateBack() for the usage of these routines.
   1.873 +
   1.874 +     inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of
   1.875 +   the paramaters are invalid, Z_MEM_ERROR if the internal state could not
   1.876 +   be allocated, or Z_VERSION_ERROR if the version of the library does not
   1.877 +   match the version of the header file.
   1.878 +*/
   1.879 +
   1.880 +typedef unsigned (*in_func) OF((void FAR *, unsigned char FAR * FAR *));
   1.881 +typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned));
   1.882 +
   1.883 +ZEXTERN int ZEXPORT inflateBack OF((z_streamp strm,
   1.884 +                                    in_func in, void FAR *in_desc,
   1.885 +                                    out_func out, void FAR *out_desc));
   1.886 +/*
   1.887 +     inflateBack() does a raw inflate with a single call using a call-back
   1.888 +   interface for input and output.  This is more efficient than inflate() for
   1.889 +   file i/o applications in that it avoids copying between the output and the
   1.890 +   sliding window by simply making the window itself the output buffer.  This
   1.891 +   function trusts the application to not change the output buffer passed by
   1.892 +   the output function, at least until inflateBack() returns.
   1.893 +
   1.894 +     inflateBackInit() must be called first to allocate the internal state
   1.895 +   and to initialize the state with the user-provided window buffer.
   1.896 +   inflateBack() may then be used multiple times to inflate a complete, raw
   1.897 +   deflate stream with each call.  inflateBackEnd() is then called to free
   1.898 +   the allocated state.
   1.899 +
   1.900 +     A raw deflate stream is one with no zlib or gzip header or trailer.
   1.901 +   This routine would normally be used in a utility that reads zip or gzip
   1.902 +   files and writes out uncompressed files.  The utility would decode the
   1.903 +   header and process the trailer on its own, hence this routine expects
   1.904 +   only the raw deflate stream to decompress.  This is different from the
   1.905 +   normal behavior of inflate(), which expects either a zlib or gzip header and
   1.906 +   trailer around the deflate stream.
   1.907 +
   1.908 +     inflateBack() uses two subroutines supplied by the caller that are then
   1.909 +   called by inflateBack() for input and output.  inflateBack() calls those
   1.910 +   routines until it reads a complete deflate stream and writes out all of the
   1.911 +   uncompressed data, or until it encounters an error.  The function's
   1.912 +   parameters and return types are defined above in the in_func and out_func
   1.913 +   typedefs.  inflateBack() will call in(in_desc, &buf) which should return the
   1.914 +   number of bytes of provided input, and a pointer to that input in buf.  If
   1.915 +   there is no input available, in() must return zero--buf is ignored in that
   1.916 +   case--and inflateBack() will return a buffer error.  inflateBack() will call
   1.917 +   out(out_desc, buf, len) to write the uncompressed data buf[0..len-1].  out()
   1.918 +   should return zero on success, or non-zero on failure.  If out() returns
   1.919 +   non-zero, inflateBack() will return with an error.  Neither in() nor out()
   1.920 +   are permitted to change the contents of the window provided to
   1.921 +   inflateBackInit(), which is also the buffer that out() uses to write from.
   1.922 +   The length written by out() will be at most the window size.  Any non-zero
   1.923 +   amount of input may be provided by in().
   1.924 +
   1.925 +     For convenience, inflateBack() can be provided input on the first call by
   1.926 +   setting strm->next_in and strm->avail_in.  If that input is exhausted, then
   1.927 +   in() will be called.  Therefore strm->next_in must be initialized before
   1.928 +   calling inflateBack().  If strm->next_in is Z_NULL, then in() will be called
   1.929 +   immediately for input.  If strm->next_in is not Z_NULL, then strm->avail_in
   1.930 +   must also be initialized, and then if strm->avail_in is not zero, input will
   1.931 +   initially be taken from strm->next_in[0 .. strm->avail_in - 1].
   1.932 +
   1.933 +     The in_desc and out_desc parameters of inflateBack() is passed as the
   1.934 +   first parameter of in() and out() respectively when they are called.  These
   1.935 +   descriptors can be optionally used to pass any information that the caller-
   1.936 +   supplied in() and out() functions need to do their job.
   1.937 +
   1.938 +     On return, inflateBack() will set strm->next_in and strm->avail_in to
   1.939 +   pass back any unused input that was provided by the last in() call.  The
   1.940 +   return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR
   1.941 +   if in() or out() returned an error, Z_DATA_ERROR if there was a format
   1.942 +   error in the deflate stream (in which case strm->msg is set to indicate the
   1.943 +   nature of the error), or Z_STREAM_ERROR if the stream was not properly
   1.944 +   initialized.  In the case of Z_BUF_ERROR, an input or output error can be
   1.945 +   distinguished using strm->next_in which will be Z_NULL only if in() returned
   1.946 +   an error.  If strm->next is not Z_NULL, then the Z_BUF_ERROR was due to
   1.947 +   out() returning non-zero.  (in() will always be called before out(), so
   1.948 +   strm->next_in is assured to be defined if out() returns non-zero.)  Note
   1.949 +   that inflateBack() cannot return Z_OK.
   1.950 +*/
   1.951 +
   1.952 +ZEXTERN int ZEXPORT inflateBackEnd OF((z_streamp strm));
   1.953 +/*
   1.954 +     All memory allocated by inflateBackInit() is freed.
   1.955 +
   1.956 +     inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream
   1.957 +   state was inconsistent.
   1.958 +*/
   1.959 +
   1.960 +ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void));
   1.961 +/* Return flags indicating compile-time options.
   1.962 +
   1.963 +    Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other:
   1.964 +     1.0: size of uInt
   1.965 +     3.2: size of uLong
   1.966 +     5.4: size of voidpf (pointer)
   1.967 +     7.6: size of z_off_t
   1.968 +
   1.969 +    Compiler, assembler, and debug options:
   1.970 +     8: DEBUG
   1.971 +     9: ASMV or ASMINF -- use ASM code
   1.972 +     10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention
   1.973 +     11: 0 (reserved)
   1.974 +
   1.975 +    One-time table building (smaller code, but not thread-safe if true):
   1.976 +     12: BUILDFIXED -- build static block decoding tables when needed
   1.977 +     13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed
   1.978 +     14,15: 0 (reserved)
   1.979 +
   1.980 +    Library content (indicates missing functionality):
   1.981 +     16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking
   1.982 +                          deflate code when not needed)
   1.983 +     17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect
   1.984 +                    and decode gzip streams (to avoid linking crc code)
   1.985 +     18-19: 0 (reserved)
   1.986 +
   1.987 +    Operation variations (changes in library functionality):
   1.988 +     20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate
   1.989 +     21: FASTEST -- deflate algorithm with only one, lowest compression level
   1.990 +     22,23: 0 (reserved)
   1.991 +
   1.992 +    The sprintf variant used by gzprintf (zero is best):
   1.993 +     24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format
   1.994 +     25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure!
   1.995 +     26: 0 = returns value, 1 = void -- 1 means inferred string length returned
   1.996 +
   1.997 +    Remainder:
   1.998 +     27-31: 0 (reserved)
   1.999 + */
  1.1000 +
  1.1001 +
  1.1002 +                        /* utility functions */
  1.1003 +
  1.1004 +/*
  1.1005 +     The following utility functions are implemented on top of the
  1.1006 +   basic stream-oriented functions. To simplify the interface, some
  1.1007 +   default options are assumed (compression level and memory usage,
  1.1008 +   standard memory allocation functions). The source code of these
  1.1009 +   utility functions can easily be modified if you need special options.
  1.1010 +*/
  1.1011 +
  1.1012 +ZEXTERN int ZEXPORT compress OF((Bytef *dest,   uLongf *destLen,
  1.1013 +                                 const Bytef *source, uLong sourceLen));
  1.1014 +/*
  1.1015 +     Compresses the source buffer into the destination buffer.  sourceLen is
  1.1016 +   the byte length of the source buffer. Upon entry, destLen is the total
  1.1017 +   size of the destination buffer, which must be at least the value returned
  1.1018 +   by compressBound(sourceLen). Upon exit, destLen is the actual size of the
  1.1019 +   compressed buffer.
  1.1020 +     This function can be used to compress a whole file at once if the
  1.1021 +   input file is mmap'ed.
  1.1022 +     compress returns Z_OK if success, Z_MEM_ERROR if there was not
  1.1023 +   enough memory, Z_BUF_ERROR if there was not enough room in the output
  1.1024 +   buffer.
  1.1025 +*/
  1.1026 +
  1.1027 +ZEXTERN int ZEXPORT compress2 OF((Bytef *dest,   uLongf *destLen,
  1.1028 +                                  const Bytef *source, uLong sourceLen,
  1.1029 +                                  int level));
  1.1030 +/*
  1.1031 +     Compresses the source buffer into the destination buffer. The level
  1.1032 +   parameter has the same meaning as in deflateInit.  sourceLen is the byte
  1.1033 +   length of the source buffer. Upon entry, destLen is the total size of the
  1.1034 +   destination buffer, which must be at least the value returned by
  1.1035 +   compressBound(sourceLen). Upon exit, destLen is the actual size of the
  1.1036 +   compressed buffer.
  1.1037 +
  1.1038 +     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
  1.1039 +   memory, Z_BUF_ERROR if there was not enough room in the output buffer,
  1.1040 +   Z_STREAM_ERROR if the level parameter is invalid.
  1.1041 +*/
  1.1042 +
  1.1043 +ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen));
  1.1044 +/*
  1.1045 +     compressBound() returns an upper bound on the compressed size after
  1.1046 +   compress() or compress2() on sourceLen bytes.  It would be used before
  1.1047 +   a compress() or compress2() call to allocate the destination buffer.
  1.1048 +*/
  1.1049 +
  1.1050 +ZEXTERN int ZEXPORT uncompress OF((Bytef *dest,   uLongf *destLen,
  1.1051 +                                   const Bytef *source, uLong sourceLen));
  1.1052 +/*
  1.1053 +     Decompresses the source buffer into the destination buffer.  sourceLen is
  1.1054 +   the byte length of the source buffer. Upon entry, destLen is the total
  1.1055 +   size of the destination buffer, which must be large enough to hold the
  1.1056 +   entire uncompressed data. (The size of the uncompressed data must have
  1.1057 +   been saved previously by the compressor and transmitted to the decompressor
  1.1058 +   by some mechanism outside the scope of this compression library.)
  1.1059 +   Upon exit, destLen is the actual size of the compressed buffer.
  1.1060 +     This function can be used to decompress a whole file at once if the
  1.1061 +   input file is mmap'ed.
  1.1062 +
  1.1063 +     uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
  1.1064 +   enough memory, Z_BUF_ERROR if there was not enough room in the output
  1.1065 +   buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete.
  1.1066 +*/
  1.1067 +
  1.1068 +
  1.1069 +typedef voidp gzFile;
  1.1070 +
  1.1071 +ZEXTERN gzFile ZEXPORT gzopen  OF((const char *path, const char *mode));
  1.1072 +/*
  1.1073 +     Opens a gzip (.gz) file for reading or writing. The mode parameter
  1.1074 +   is as in fopen ("rb" or "wb") but can also include a compression level
  1.1075 +   ("wb9") or a strategy: 'f' for filtered data as in "wb6f", 'h' for
  1.1076 +   Huffman only compression as in "wb1h", or 'R' for run-length encoding
  1.1077 +   as in "wb1R". (See the description of deflateInit2 for more information
  1.1078 +   about the strategy parameter.)
  1.1079 +
  1.1080 +     gzopen can be used to read a file which is not in gzip format; in this
  1.1081 +   case gzread will directly read from the file without decompression.
  1.1082 +
  1.1083 +     gzopen returns NULL if the file could not be opened or if there was
  1.1084 +   insufficient memory to allocate the (de)compression state; errno
  1.1085 +   can be checked to distinguish the two cases (if errno is zero, the
  1.1086 +   zlib error is Z_MEM_ERROR).  */
  1.1087 +
  1.1088 +ZEXTERN gzFile ZEXPORT gzdopen  OF((int fd, const char *mode));
  1.1089 +/*
  1.1090 +     gzdopen() associates a gzFile with the file descriptor fd.  File
  1.1091 +   descriptors are obtained from calls like open, dup, creat, pipe or
  1.1092 +   fileno (in the file has been previously opened with fopen).
  1.1093 +   The mode parameter is as in gzopen.
  1.1094 +     The next call of gzclose on the returned gzFile will also close the
  1.1095 +   file descriptor fd, just like fclose(fdopen(fd), mode) closes the file
  1.1096 +   descriptor fd. If you want to keep fd open, use gzdopen(dup(fd), mode).
  1.1097 +     gzdopen returns NULL if there was insufficient memory to allocate
  1.1098 +   the (de)compression state.
  1.1099 +*/
  1.1100 +
  1.1101 +ZEXTERN int ZEXPORT gzsetparams OF((gzFile file, int level, int strategy));
  1.1102 +/*
  1.1103 +     Dynamically update the compression level or strategy. See the description
  1.1104 +   of deflateInit2 for the meaning of these parameters.
  1.1105 +     gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not
  1.1106 +   opened for writing.
  1.1107 +*/
  1.1108 +
  1.1109 +ZEXTERN int ZEXPORT    gzread  OF((gzFile file, voidp buf, unsigned len));
  1.1110 +/*
  1.1111 +     Reads the given number of uncompressed bytes from the compressed file.
  1.1112 +   If the input file was not in gzip format, gzread copies the given number
  1.1113 +   of bytes into the buffer.
  1.1114 +     gzread returns the number of uncompressed bytes actually read (0 for
  1.1115 +   end of file, -1 for error). */
  1.1116 +
  1.1117 +ZEXTERN int ZEXPORT    gzwrite OF((gzFile file,
  1.1118 +                                   voidpc buf, unsigned len));
  1.1119 +/*
  1.1120 +     Writes the given number of uncompressed bytes into the compressed file.
  1.1121 +   gzwrite returns the number of uncompressed bytes actually written
  1.1122 +   (0 in case of error).
  1.1123 +*/
  1.1124 +
  1.1125 +ZEXTERN int ZEXPORTVA   gzprintf OF((gzFile file, const char *format, ...));
  1.1126 +/*
  1.1127 +     Converts, formats, and writes the args to the compressed file under
  1.1128 +   control of the format string, as in fprintf. gzprintf returns the number of
  1.1129 +   uncompressed bytes actually written (0 in case of error).  The number of
  1.1130 +   uncompressed bytes written is limited to 4095. The caller should assure that
  1.1131 +   this limit is not exceeded. If it is exceeded, then gzprintf() will return
  1.1132 +   return an error (0) with nothing written. In this case, there may also be a
  1.1133 +   buffer overflow with unpredictable consequences, which is possible only if
  1.1134 +   zlib was compiled with the insecure functions sprintf() or vsprintf()
  1.1135 +   because the secure snprintf() or vsnprintf() functions were not available.
  1.1136 +*/
  1.1137 +
  1.1138 +ZEXTERN int ZEXPORT gzputs OF((gzFile file, const char *s));
  1.1139 +/*
  1.1140 +      Writes the given null-terminated string to the compressed file, excluding
  1.1141 +   the terminating null character.
  1.1142 +      gzputs returns the number of characters written, or -1 in case of error.
  1.1143 +*/
  1.1144 +
  1.1145 +ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len));
  1.1146 +/*
  1.1147 +      Reads bytes from the compressed file until len-1 characters are read, or
  1.1148 +   a newline character is read and transferred to buf, or an end-of-file
  1.1149 +   condition is encountered.  The string is then terminated with a null
  1.1150 +   character.
  1.1151 +      gzgets returns buf, or Z_NULL in case of error.
  1.1152 +*/
  1.1153 +
  1.1154 +ZEXTERN int ZEXPORT    gzputc OF((gzFile file, int c));
  1.1155 +/*
  1.1156 +      Writes c, converted to an unsigned char, into the compressed file.
  1.1157 +   gzputc returns the value that was written, or -1 in case of error.
  1.1158 +*/
  1.1159 +
  1.1160 +ZEXTERN int ZEXPORT    gzgetc OF((gzFile file));
  1.1161 +/*
  1.1162 +      Reads one byte from the compressed file. gzgetc returns this byte
  1.1163 +   or -1 in case of end of file or error.
  1.1164 +*/
  1.1165 +
  1.1166 +ZEXTERN int ZEXPORT    gzungetc OF((int c, gzFile file));
  1.1167 +/*
  1.1168 +      Push one character back onto the stream to be read again later.
  1.1169 +   Only one character of push-back is allowed.  gzungetc() returns the
  1.1170 +   character pushed, or -1 on failure.  gzungetc() will fail if a
  1.1171 +   character has been pushed but not read yet, or if c is -1. The pushed
  1.1172 +   character will be discarded if the stream is repositioned with gzseek()
  1.1173 +   or gzrewind().
  1.1174 +*/
  1.1175 +
  1.1176 +ZEXTERN int ZEXPORT    gzflush OF((gzFile file, int flush));
  1.1177 +/*
  1.1178 +     Flushes all pending output into the compressed file. The parameter
  1.1179 +   flush is as in the deflate() function. The return value is the zlib
  1.1180 +   error number (see function gzerror below). gzflush returns Z_OK if
  1.1181 +   the flush parameter is Z_FINISH and all output could be flushed.
  1.1182 +     gzflush should be called only when strictly necessary because it can
  1.1183 +   degrade compression.
  1.1184 +*/
  1.1185 +
  1.1186 +ZEXTERN z_off_t ZEXPORT    gzseek OF((gzFile file,
  1.1187 +                                      z_off_t offset, int whence));
  1.1188 +/*
  1.1189 +      Sets the starting position for the next gzread or gzwrite on the
  1.1190 +   given compressed file. The offset represents a number of bytes in the
  1.1191 +   uncompressed data stream. The whence parameter is defined as in lseek(2);
  1.1192 +   the value SEEK_END is not supported.
  1.1193 +     If the file is opened for reading, this function is emulated but can be
  1.1194 +   extremely slow. If the file is opened for writing, only forward seeks are
  1.1195 +   supported; gzseek then compresses a sequence of zeroes up to the new
  1.1196 +   starting position.
  1.1197 +
  1.1198 +      gzseek returns the resulting offset location as measured in bytes from
  1.1199 +   the beginning of the uncompressed stream, or -1 in case of error, in
  1.1200 +   particular if the file is opened for writing and the new starting position
  1.1201 +   would be before the current position.
  1.1202 +*/
  1.1203 +
  1.1204 +ZEXTERN int ZEXPORT    gzrewind OF((gzFile file));
  1.1205 +/*
  1.1206 +     Rewinds the given file. This function is supported only for reading.
  1.1207 +
  1.1208 +   gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET)
  1.1209 +*/
  1.1210 +
  1.1211 +ZEXTERN z_off_t ZEXPORT    gztell OF((gzFile file));
  1.1212 +/*
  1.1213 +     Returns the starting position for the next gzread or gzwrite on the
  1.1214 +   given compressed file. This position represents a number of bytes in the
  1.1215 +   uncompressed data stream.
  1.1216 +
  1.1217 +   gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR)
  1.1218 +*/
  1.1219 +
  1.1220 +ZEXTERN int ZEXPORT gzeof OF((gzFile file));
  1.1221 +/*
  1.1222 +     Returns 1 when EOF has previously been detected reading the given
  1.1223 +   input stream, otherwise zero.
  1.1224 +*/
  1.1225 +
  1.1226 +ZEXTERN int ZEXPORT gzdirect OF((gzFile file));
  1.1227 +/*
  1.1228 +     Returns 1 if file is being read directly without decompression, otherwise
  1.1229 +   zero.
  1.1230 +*/
  1.1231 +
  1.1232 +ZEXTERN int ZEXPORT    gzclose OF((gzFile file));
  1.1233 +/*
  1.1234 +     Flushes all pending output if necessary, closes the compressed file
  1.1235 +   and deallocates all the (de)compression state. The return value is the zlib
  1.1236 +   error number (see function gzerror below).
  1.1237 +*/
  1.1238 +
  1.1239 +ZEXTERN const char * ZEXPORT gzerror OF((gzFile file, int *errnum));
  1.1240 +/*
  1.1241 +     Returns the error message for the last error which occurred on the
  1.1242 +   given compressed file. errnum is set to zlib error number. If an
  1.1243 +   error occurred in the file system and not in the compression library,
  1.1244 +   errnum is set to Z_ERRNO and the application may consult errno
  1.1245 +   to get the exact error code.
  1.1246 +*/
  1.1247 +
  1.1248 +ZEXTERN void ZEXPORT gzclearerr OF((gzFile file));
  1.1249 +/*
  1.1250 +     Clears the error and end-of-file flags for file. This is analogous to the
  1.1251 +   clearerr() function in stdio. This is useful for continuing to read a gzip
  1.1252 +   file that is being written concurrently.
  1.1253 +*/
  1.1254 +
  1.1255 +                        /* checksum functions */
  1.1256 +
  1.1257 +/*
  1.1258 +     These functions are not related to compression but are exported
  1.1259 +   anyway because they might be useful in applications using the
  1.1260 +   compression library.
  1.1261 +*/
  1.1262 +
  1.1263 +ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
  1.1264 +/*
  1.1265 +     Update a running Adler-32 checksum with the bytes buf[0..len-1] and
  1.1266 +   return the updated checksum. If buf is NULL, this function returns
  1.1267 +   the required initial value for the checksum.
  1.1268 +   An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
  1.1269 +   much faster. Usage example:
  1.1270 +
  1.1271 +     uLong adler = adler32(0L, Z_NULL, 0);
  1.1272 +
  1.1273 +     while (read_buffer(buffer, length) != EOF) {
  1.1274 +       adler = adler32(adler, buffer, length);
  1.1275 +     }
  1.1276 +     if (adler != original_adler) error();
  1.1277 +*/
  1.1278 +
  1.1279 +ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2,
  1.1280 +                                          z_off_t len2));
  1.1281 +/*
  1.1282 +     Combine two Adler-32 checksums into one.  For two sequences of bytes, seq1
  1.1283 +   and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for
  1.1284 +   each, adler1 and adler2.  adler32_combine() returns the Adler-32 checksum of
  1.1285 +   seq1 and seq2 concatenated, requiring only adler1, adler2, and len2.
  1.1286 +*/
  1.1287 +
  1.1288 +ZEXTERN uLong ZEXPORT crc32   OF((uLong crc, const Bytef *buf, uInt len));
  1.1289 +/*
  1.1290 +     Update a running CRC-32 with the bytes buf[0..len-1] and return the
  1.1291 +   updated CRC-32. If buf is NULL, this function returns the required initial
  1.1292 +   value for the for the crc. Pre- and post-conditioning (one's complement) is
  1.1293 +   performed within this function so it shouldn't be done by the application.
  1.1294 +   Usage example:
  1.1295 +
  1.1296 +     uLong crc = crc32(0L, Z_NULL, 0);
  1.1297 +
  1.1298 +     while (read_buffer(buffer, length) != EOF) {
  1.1299 +       crc = crc32(crc, buffer, length);
  1.1300 +     }
  1.1301 +     if (crc != original_crc) error();
  1.1302 +*/
  1.1303 +
  1.1304 +ZEXTERN uLong ZEXPORT crc32_combine OF((uLong crc1, uLong crc2, z_off_t len2));
  1.1305 +
  1.1306 +/*
  1.1307 +     Combine two CRC-32 check values into one.  For two sequences of bytes,
  1.1308 +   seq1 and seq2 with lengths len1 and len2, CRC-32 check values were
  1.1309 +   calculated for each, crc1 and crc2.  crc32_combine() returns the CRC-32
  1.1310 +   check value of seq1 and seq2 concatenated, requiring only crc1, crc2, and
  1.1311 +   len2.
  1.1312 +*/
  1.1313 +
  1.1314 +
  1.1315 +                        /* various hacks, don't look :) */
  1.1316 +
  1.1317 +/* deflateInit and inflateInit are macros to allow checking the zlib version
  1.1318 + * and the compiler's view of z_stream:
  1.1319 + */
  1.1320 +ZEXTERN int ZEXPORT deflateInit_ OF((z_streamp strm, int level,
  1.1321 +                                     const char *version, int stream_size));
  1.1322 +ZEXTERN int ZEXPORT inflateInit_ OF((z_streamp strm,
  1.1323 +                                     const char *version, int stream_size));
  1.1324 +ZEXTERN int ZEXPORT deflateInit2_ OF((z_streamp strm, int  level, int  method,
  1.1325 +                                      int windowBits, int memLevel,
  1.1326 +                                      int strategy, const char *version,
  1.1327 +                                      int stream_size));
  1.1328 +ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int  windowBits,
  1.1329 +                                      const char *version, int stream_size));
  1.1330 +ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,
  1.1331 +                                         unsigned char FAR *window,
  1.1332 +                                         const char *version,
  1.1333 +                                         int stream_size));
  1.1334 +#define deflateInit(strm, level) \
  1.1335 +        deflateInit_((strm), (level),       ZLIB_VERSION, sizeof(z_stream))
  1.1336 +#define inflateInit(strm) \
  1.1337 +        inflateInit_((strm),                ZLIB_VERSION, sizeof(z_stream))
  1.1338 +#define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
  1.1339 +        deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
  1.1340 +                      (strategy),           ZLIB_VERSION, sizeof(z_stream))
  1.1341 +#define inflateInit2(strm, windowBits) \
  1.1342 +        inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))
  1.1343 +#define inflateBackInit(strm, windowBits, window) \
  1.1344 +        inflateBackInit_((strm), (windowBits), (window), \
  1.1345 +        ZLIB_VERSION, sizeof(z_stream))
  1.1346 +
  1.1347 +
  1.1348 +#if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL)
  1.1349 +    struct internal_state {int dummy;}; /* hack for buggy compilers */
  1.1350 +#endif
  1.1351 +
  1.1352 +ZEXTERN const char   * ZEXPORT zError           OF((int));
  1.1353 +ZEXTERN int            ZEXPORT inflateSyncPoint OF((z_streamp z));
  1.1354 +ZEXTERN const uLongf * ZEXPORT get_crc_table    OF((void));
  1.1355 +
  1.1356 +#ifdef __cplusplus
  1.1357 +}
  1.1358 +#endif
  1.1359 +
  1.1360 +#endif /* ZLIB_H */