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/* zlib.h -- interface of the 'zlib' general purpose compression library
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version 1.2.2, October 3rd, 2004
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Copyright (C) 1995-2004 Jean-loup Gailly and Mark Adler
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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Jean-loup Gailly Mark Adler
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jloup@gzip.org madler@alumni.caltech.edu
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The data format used by the zlib library is described by RFCs (Request for
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Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt
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(zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format).
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#define ZLIB_VERSION "1.2.2"
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#define ZLIB_VERNUM 0x1220
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#define Q_ZEXPORT __declspec(dllexport)
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#if defined(QT_DLL) && !defined(QT_PLUGIN)
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#define Q_ZEXPORT __declspec(dllimport)
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#define Q_ZEXPORT ZEXPORT
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#include <qfunctions_wce.h>
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The 'zlib' compression library provides in-memory compression and
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decompression functions, including integrity checks of the uncompressed
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data. This version of the library supports only one compression method
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(deflation) but other algorithms will be added later and will have the same
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Compression can be done in a single step if the buffers are large
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enough (for example if an input file is mmap'ed), or can be done by
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repeated calls of the compression function. In the latter case, the
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application must provide more input and/or consume the output
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(providing more output space) before each call.
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The compressed data format used by default by the in-memory functions is
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the zlib format, which is a zlib wrapper documented in RFC 1950, wrapped
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around a deflate stream, which is itself documented in RFC 1951.
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The library also supports reading and writing files in gzip (.gz) format
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with an interface similar to that of stdio using the functions that start
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with "gz". The gzip format is different from the zlib format. gzip is a
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gzip wrapper, documented in RFC 1952, wrapped around a deflate stream.
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This library can optionally read and write gzip streams in memory as well.
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The zlib format was designed to be compact and fast for use in memory
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and on communications channels. The gzip format was designed for single-
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file compression on file systems, has a larger header than zlib to maintain
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directory information, and uses a different, slower check method than zlib.
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The library does not install any signal handler. The decoder checks
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the consistency of the compressed data, so the library should never
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crash even in case of corrupted input.
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typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
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typedef void (*free_func) OF((voidpf opaque, voidpf address));
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struct internal_state;
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typedef struct z_stream_s {
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Bytef *next_in; /* next input byte */
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uInt avail_in; /* number of bytes available at next_in */
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uLong total_in; /* total nb of input bytes read so far */
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Bytef *next_out; /* next output byte should be put there */
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uInt avail_out; /* remaining free space at next_out */
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uLong total_out; /* total nb of bytes output so far */
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char *msg; /* last error message, NULL if no error */
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struct internal_state FAR *state; /* not visible by applications */
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alloc_func zalloc; /* used to allocate the internal state */
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free_func zfree; /* used to free the internal state */
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voidpf opaque; /* private data object passed to zalloc and zfree */
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int data_type; /* best guess about the data type: ascii or binary */
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uLong adler; /* adler32 value of the uncompressed data */
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uLong reserved; /* reserved for future use */
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typedef z_stream FAR *z_streamp;
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The application must update next_in and avail_in when avail_in has
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dropped to zero. It must update next_out and avail_out when avail_out
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has dropped to zero. The application must initialize zalloc, zfree and
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opaque before calling the init function. All other fields are set by the
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compression library and must not be updated by the application.
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The opaque value provided by the application will be passed as the first
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parameter for calls of zalloc and zfree. This can be useful for custom
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memory management. The compression library attaches no meaning to the
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zalloc must return Z_NULL if there is not enough memory for the object.
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If zlib is used in a multi-threaded application, zalloc and zfree must be
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On 16-bit systems, the functions zalloc and zfree must be able to allocate
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exactly 65536 bytes, but will not be required to allocate more than this
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if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS,
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pointers returned by zalloc for objects of exactly 65536 bytes *must*
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have their offset normalized to zero. The default allocation function
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provided by this library ensures this (see zutil.c). To reduce memory
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requirements and avoid any allocation of 64K objects, at the expense of
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compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h).
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The fields total_in and total_out can be used for statistics or
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progress reports. After compression, total_in holds the total size of
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the uncompressed data and may be saved for use in the decompressor
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(particularly if the decompressor wants to decompress everything in
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#define Z_PARTIAL_FLUSH 1 /* will be removed, use Z_SYNC_FLUSH instead */
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#define Z_SYNC_FLUSH 2
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#define Z_FULL_FLUSH 3
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/* Allowed flush values; see deflate() and inflate() below for details */
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#define Z_STREAM_END 1
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#define Z_NEED_DICT 2
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#define Z_STREAM_ERROR (-2)
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#define Z_DATA_ERROR (-3)
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#define Z_MEM_ERROR (-4)
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#define Z_BUF_ERROR (-5)
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#define Z_VERSION_ERROR (-6)
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/* Return codes for the compression/decompression functions. Negative
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* values are errors, positive values are used for special but normal events.
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#define Z_NO_COMPRESSION 0
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#define Z_BEST_SPEED 1
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#define Z_BEST_COMPRESSION 9
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#define Z_DEFAULT_COMPRESSION (-1)
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/* compression levels */
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#define Z_HUFFMAN_ONLY 2
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#define Z_DEFAULT_STRATEGY 0
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/* compression strategy; see deflateInit2() below for details */
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/* Possible values of the data_type field (though see inflate()) */
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/* The deflate compression method (the only one supported in this version) */
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#define Z_NULL 0 /* for initializing zalloc, zfree, opaque */
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#define zlib_version zlibVersion()
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/* for compatibility with versions < 1.0.2 */
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/* basic functions */
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ZEXTERN Q_ZEXPORT const char * zlibVersion OF((void));
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/* The application can compare zlibVersion and ZLIB_VERSION for consistency.
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If the first character differs, the library code actually used is
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not compatible with the zlib.h header file used by the application.
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This check is automatically made by deflateInit and inflateInit.
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ZEXTERN int ZEXPORT deflateInit OF((z_streamp strm, int level));
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Initializes the internal stream state for compression. The fields
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zalloc, zfree and opaque must be initialized before by the caller.
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If zalloc and zfree are set to Z_NULL, deflateInit updates them to
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use default allocation functions.
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The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9:
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1 gives best speed, 9 gives best compression, 0 gives no compression at
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all (the input data is simply copied a block at a time).
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Z_DEFAULT_COMPRESSION requests a default compromise between speed and
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compression (currently equivalent to level 6).
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deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
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enough memory, Z_STREAM_ERROR if level is not a valid compression level,
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Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible
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with the version assumed by the caller (ZLIB_VERSION).
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msg is set to null if there is no error message. deflateInit does not
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perform any compression: this will be done by deflate().
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ZEXTERN int Q_ZEXPORT deflate OF((z_streamp strm, int flush));
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deflate compresses as much data as possible, and stops when the input
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buffer becomes empty or the output buffer becomes full. It may introduce some
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output latency (reading input without producing any output) except when
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The detailed semantics are as follows. deflate performs one or both of the
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- Compress more input starting at next_in and update next_in and avail_in
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accordingly. If not all input can be processed (because there is not
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enough room in the output buffer), next_in and avail_in are updated and
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processing will resume at this point for the next call of deflate().
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- Provide more output starting at next_out and update next_out and avail_out
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accordingly. This action is forced if the parameter flush is non zero.
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Forcing flush frequently degrades the compression ratio, so this parameter
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should be set only when necessary (in interactive applications).
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Some output may be provided even if flush is not set.
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Before the call of deflate(), the application should ensure that at least
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one of the actions is possible, by providing more input and/or consuming
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more output, and updating avail_in or avail_out accordingly; avail_out
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should never be zero before the call. The application can consume the
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compressed output when it wants, for example when the output buffer is full
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(avail_out == 0), or after each call of deflate(). If deflate returns Z_OK
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and with zero avail_out, it must be called again after making room in the
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output buffer because there might be more output pending.
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If the parameter flush is set to Z_SYNC_FLUSH, all pending output is
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flushed to the output buffer and the output is aligned on a byte boundary, so
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that the decompressor can get all input data available so far. (In particular
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avail_in is zero after the call if enough output space has been provided
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before the call.) Flushing may degrade compression for some compression
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algorithms and so it should be used only when necessary.
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If flush is set to Z_FULL_FLUSH, all output is flushed as with
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Z_SYNC_FLUSH, and the compression state is reset so that decompression can
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restart from this point if previous compressed data has been damaged or if
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random access is desired. Using Z_FULL_FLUSH too often can seriously degrade
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If deflate returns with avail_out == 0, this function must be called again
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with the same value of the flush parameter and more output space (updated
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avail_out), until the flush is complete (deflate returns with non-zero
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avail_out). In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that
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avail_out is greater than six to avoid repeated flush markers due to
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avail_out == 0 on return.
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If the parameter flush is set to Z_FINISH, pending input is processed,
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pending output is flushed and deflate returns with Z_STREAM_END if there
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was enough output space; if deflate returns with Z_OK, this function must be
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called again with Z_FINISH and more output space (updated avail_out) but no
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more input data, until it returns with Z_STREAM_END or an error. After
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deflate has returned Z_STREAM_END, the only possible operations on the
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stream are deflateReset or deflateEnd.
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Z_FINISH can be used immediately after deflateInit if all the compression
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is to be done in a single step. In this case, avail_out must be at least
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the value returned by deflateBound (see below). If deflate does not return
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Z_STREAM_END, then it must be called again as described above.
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deflate() sets strm->adler to the adler32 checksum of all input read
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so far (that is, total_in bytes).
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deflate() may update data_type if it can make a good guess about
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the input data type (Z_ASCII or Z_BINARY). In doubt, the data is considered
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binary. This field is only for information purposes and does not affect
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the compression algorithm in any manner.
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deflate() returns Z_OK if some progress has been made (more input
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processed or more output produced), Z_STREAM_END if all input has been
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consumed and all output has been produced (only when flush is set to
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Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example
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if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible
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(for example avail_in or avail_out was zero). Note that Z_BUF_ERROR is not
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fatal, and deflate() can be called again with more input and more output
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space to continue compressing.
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ZEXTERN int Q_ZEXPORT deflateEnd OF((z_streamp strm));
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All dynamically allocated data structures for this stream are freed.
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This function discards any unprocessed input and does not flush any
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deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the
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stream state was inconsistent, Z_DATA_ERROR if the stream was freed
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prematurely (some input or output was discarded). In the error case,
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msg may be set but then points to a static string (which must not be
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ZEXTERN int ZEXPORT inflateInit OF((z_streamp strm));
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Initializes the internal stream state for decompression. The fields
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next_in, avail_in, zalloc, zfree and opaque must be initialized before by
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the caller. If next_in is not Z_NULL and avail_in is large enough (the exact
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value depends on the compression method), inflateInit determines the
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compression method from the zlib header and allocates all data structures
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accordingly; otherwise the allocation will be deferred to the first call of
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inflate. If zalloc and zfree are set to Z_NULL, inflateInit updates them to
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use default allocation functions.
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inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
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memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
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version assumed by the caller. msg is set to null if there is no error
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message. inflateInit does not perform any decompression apart from reading
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the zlib header if present: this will be done by inflate(). (So next_in and
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avail_in may be modified, but next_out and avail_out are unchanged.)
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ZEXTERN int Q_ZEXPORT inflate OF((z_streamp strm, int flush));
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inflate decompresses as much data as possible, and stops when the input
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buffer becomes empty or the output buffer becomes full. It may introduce
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some output latency (reading input without producing any output) except when
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The detailed semantics are as follows. inflate performs one or both of the
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- Decompress more input starting at next_in and update next_in and avail_in
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accordingly. If not all input can be processed (because there is not
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enough room in the output buffer), next_in is updated and processing
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will resume at this point for the next call of inflate().
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- Provide more output starting at next_out and update next_out and avail_out
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accordingly. inflate() provides as much output as possible, until there
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is no more input data or no more space in the output buffer (see below
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about the flush parameter).
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Before the call of inflate(), the application should ensure that at least
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one of the actions is possible, by providing more input and/or consuming
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more output, and updating the next_* and avail_* values accordingly.
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The application can consume the uncompressed output when it wants, for
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example when the output buffer is full (avail_out == 0), or after each
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call of inflate(). If inflate returns Z_OK and with zero avail_out, it
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must be called again after making room in the output buffer because there
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might be more output pending.
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The flush parameter of inflate() can be Z_NO_FLUSH, Z_SYNC_FLUSH,
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Z_FINISH, or Z_BLOCK. Z_SYNC_FLUSH requests that inflate() flush as much
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output as possible to the output buffer. Z_BLOCK requests that inflate() stop
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if and when it get to the next deflate block boundary. When decoding the zlib
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or gzip format, this will cause inflate() to return immediately after the
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header and before the first block. When doing a raw inflate, inflate() will
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go ahead and process the first block, and will return when it gets to the end
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of that block, or when it runs out of data.
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The Z_BLOCK option assists in appending to or combining deflate streams.
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Also to assist in this, on return inflate() will set strm->data_type to the
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number of unused bits in the last byte taken from strm->next_in, plus 64
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if inflate() is currently decoding the last block in the deflate stream,
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plus 128 if inflate() returned immediately after decoding an end-of-block
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code or decoding the complete header up to just before the first byte of the
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deflate stream. The end-of-block will not be indicated until all of the
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uncompressed data from that block has been written to strm->next_out. The
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number of unused bits may in general be greater than seven, except when
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bit 7 of data_type is set, in which case the number of unused bits will be
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inflate() should normally be called until it returns Z_STREAM_END or an
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error. However if all decompression is to be performed in a single step
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(a single call of inflate), the parameter flush should be set to
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Z_FINISH. In this case all pending input is processed and all pending
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output is flushed; avail_out must be large enough to hold all the
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uncompressed data. (The size of the uncompressed data may have been saved
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by the compressor for this purpose.) The next operation on this stream must
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be inflateEnd to deallocate the decompression state. The use of Z_FINISH
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is never required, but can be used to inform inflate that a faster approach
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may be used for the single inflate() call.
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In this implementation, inflate() always flushes as much output as
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possible to the output buffer, and always uses the faster approach on the
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first call. So the only effect of the flush parameter in this implementation
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is on the return value of inflate(), as noted below, or when it returns early
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because Z_BLOCK is used.
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If a preset dictionary is needed after this call (see inflateSetDictionary
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below), inflate sets strm->adler to the adler32 checksum of the dictionary
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chosen by the compressor and returns Z_NEED_DICT; otherwise it sets
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strm->adler to the adler32 checksum of all output produced so far (that is,
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total_out bytes) and returns Z_OK, Z_STREAM_END or an error code as described
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below. At the end of the stream, inflate() checks that its computed adler32
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checksum is equal to that saved by the compressor and returns Z_STREAM_END
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only if the checksum is correct.
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inflate() will decompress and check either zlib-wrapped or gzip-wrapped
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deflate data. The header type is detected automatically. Any information
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contained in the gzip header is not retained, so applications that need that
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information should instead use raw inflate, see inflateInit2() below, or
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inflateBack() and perform their own processing of the gzip header and
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inflate() returns Z_OK if some progress has been made (more input processed
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or more output produced), Z_STREAM_END if the end of the compressed data has
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been reached and all uncompressed output has been produced, Z_NEED_DICT if a
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preset dictionary is needed at this point, Z_DATA_ERROR if the input data was
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corrupted (input stream not conforming to the zlib format or incorrect check
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value), Z_STREAM_ERROR if the stream structure was inconsistent (for example
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if next_in or next_out was NULL), Z_MEM_ERROR if there was not enough memory,
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Z_BUF_ERROR if no progress is possible or if there was not enough room in the
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output buffer when Z_FINISH is used. Note that Z_BUF_ERROR is not fatal, and
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inflate() can be called again with more input and more output space to
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continue decompressing. If Z_DATA_ERROR is returned, the application may then
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call inflateSync() to look for a good compression block if a partial recovery
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of the data is desired.
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ZEXTERN int Q_ZEXPORT inflateEnd OF((z_streamp strm));
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All dynamically allocated data structures for this stream are freed.
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This function discards any unprocessed input and does not flush any
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inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state
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was inconsistent. In the error case, msg may be set but then points to a
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static string (which must not be deallocated).
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/* Advanced functions */
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The following functions are needed only in some special applications.
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ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm,
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This is another version of deflateInit with more compression options. The
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fields next_in, zalloc, zfree and opaque must be initialized before by
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The method parameter is the compression method. It must be Z_DEFLATED in
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this version of the library.
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The windowBits parameter is the base two logarithm of the window size
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(the size of the history buffer). It should be in the range 8..15 for this
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version of the library. Larger values of this parameter result in better
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compression at the expense of memory usage. The default value is 15 if
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deflateInit is used instead.
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windowBits can also be -8..-15 for raw deflate. In this case, -windowBits
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determines the window size. deflate() will then generate raw deflate data
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with no zlib header or trailer, and will not compute an adler32 check value.
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windowBits can also be greater than 15 for optional gzip encoding. Add
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16 to windowBits to write a simple gzip header and trailer around the
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compressed data instead of a zlib wrapper. The gzip header will have no
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file name, no extra data, no comment, no modification time (set to zero),
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no header crc, and the operating system will be set to 255 (unknown). If a
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gzip stream is being written, strm->adler is a crc32 instead of an adler32.
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The memLevel parameter specifies how much memory should be allocated
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for the internal compression state. memLevel=1 uses minimum memory but
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is slow and reduces compression ratio; memLevel=9 uses maximum memory
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for optimal speed. The default value is 8. See zconf.h for total memory
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usage as a function of windowBits and memLevel.
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The strategy parameter is used to tune the compression algorithm. Use the
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value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a
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filter (or predictor), Z_HUFFMAN_ONLY to force Huffman encoding only (no
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string match), or Z_RLE to limit match distances to one (run-length
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encoding). Filtered data consists mostly of small values with a somewhat
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random distribution. In this case, the compression algorithm is tuned to
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compress them better. The effect of Z_FILTERED is to force more Huffman
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coding and less string matching; it is somewhat intermediate between
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Z_DEFAULT and Z_HUFFMAN_ONLY. Z_RLE is designed to be almost as fast as
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Z_HUFFMAN_ONLY, but give better compression for PNG image data. The strategy
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parameter only affects the compression ratio but not the correctness of the
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compressed output even if it is not set appropriately.
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deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
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memory, Z_STREAM_ERROR if a parameter is invalid (such as an invalid
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method). msg is set to null if there is no error message. deflateInit2 does
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not perform any compression: this will be done by deflate().
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ZEXTERN int Q_ZEXPORT deflateSetDictionary OF((z_streamp strm,
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const Bytef *dictionary,
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Initializes the compression dictionary from the given byte sequence
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without producing any compressed output. This function must be called
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immediately after deflateInit, deflateInit2 or deflateReset, before any
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call of deflate. The compressor and decompressor must use exactly the same
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dictionary (see inflateSetDictionary).
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The dictionary should consist of strings (byte sequences) that are likely
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to be encountered later in the data to be compressed, with the most commonly
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used strings preferably put towards the end of the dictionary. Using a
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dictionary is most useful when the data to be compressed is short and can be
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predicted with good accuracy; the data can then be compressed better than
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with the default empty dictionary.
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Depending on the size of the compression data structures selected by
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deflateInit or deflateInit2, a part of the dictionary may in effect be
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discarded, for example if the dictionary is larger than the window size in
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deflate or deflate2. Thus the strings most likely to be useful should be
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put at the end of the dictionary, not at the front.
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Upon return of this function, strm->adler is set to the adler32 value
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of the dictionary; the decompressor may later use this value to determine
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which dictionary has been used by the compressor. (The adler32 value
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applies to the whole dictionary even if only a subset of the dictionary is
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actually used by the compressor.) If a raw deflate was requested, then the
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adler32 value is not computed and strm->adler is not set.
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deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a
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parameter is invalid (such as NULL dictionary) or the stream state is
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inconsistent (for example if deflate has already been called for this stream
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or if the compression method is bsort). deflateSetDictionary does not
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perform any compression: this will be done by deflate().
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ZEXTERN int Q_ZEXPORT deflateCopy OF((z_streamp dest,
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Sets the destination stream as a complete copy of the source stream.
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This function can be useful when several compression strategies will be
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tried, for example when there are several ways of pre-processing the input
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data with a filter. The streams that will be discarded should then be freed
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by calling deflateEnd. Note that deflateCopy duplicates the internal
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compression state which can be quite large, so this strategy is slow and
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can consume lots of memory.
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deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
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enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
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(such as zalloc being NULL). msg is left unchanged in both source and
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ZEXTERN int Q_ZEXPORT deflateReset OF((z_streamp strm));
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This function is equivalent to deflateEnd followed by deflateInit,
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but does not free and reallocate all the internal compression state.
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The stream will keep the same compression level and any other attributes
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that may have been set by deflateInit2.
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deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
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stream state was inconsistent (such as zalloc or state being NULL).
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ZEXTERN int Q_ZEXPORT deflateParams OF((z_streamp strm,
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Dynamically update the compression level and compression strategy. The
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interpretation of level and strategy is as in deflateInit2. This can be
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used to switch between compression and straight copy of the input data, or
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to switch to a different kind of input data requiring a different
594
strategy. If the compression level is changed, the input available so far
595
is compressed with the old level (and may be flushed); the new level will
596
take effect only at the next call of deflate().
598
Before the call of deflateParams, the stream state must be set as for
599
a call of deflate(), since the currently available input may have to
600
be compressed and flushed. In particular, strm->avail_out must be non-zero.
602
deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source
603
stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR
604
if strm->avail_out was zero.
607
ZEXTERN uLong ZEXPORT deflateBound OF((z_streamp strm,
610
deflateBound() returns an upper bound on the compressed size after
611
deflation of sourceLen bytes. It must be called after deflateInit()
612
or deflateInit2(). This would be used to allocate an output buffer
613
for deflation in a single pass, and so would be called before deflate().
616
ZEXTERN int ZEXPORT deflatePrime OF((z_streamp strm,
620
deflatePrime() inserts bits in the deflate output stream. The intent
621
is that this function is used to start off the deflate output with the
622
bits leftover from a previous deflate stream when appending to it. As such,
623
this function can only be used for raw deflate, and must be used before the
624
first deflate() call after a deflateInit2() or deflateReset(). bits must be
625
less than or equal to 16, and that many of the least significant bits of
626
value will be inserted in the output.
628
deflatePrime returns Z_OK if success, or Z_STREAM_ERROR if the source
629
stream state was inconsistent.
633
ZEXTERN int ZEXPORT inflateInit2 OF((z_streamp strm,
636
This is another version of inflateInit with an extra parameter. The
637
fields next_in, avail_in, zalloc, zfree and opaque must be initialized
638
before by the caller.
640
The windowBits parameter is the base two logarithm of the maximum window
641
size (the size of the history buffer). It should be in the range 8..15 for
642
this version of the library. The default value is 15 if inflateInit is used
643
instead. windowBits must be greater than or equal to the windowBits value
644
provided to deflateInit2() while compressing, or it must be equal to 15 if
645
deflateInit2() was not used. If a compressed stream with a larger window
646
size is given as input, inflate() will return with the error code
647
Z_DATA_ERROR instead of trying to allocate a larger window.
649
windowBits can also be -8..-15 for raw inflate. In this case, -windowBits
650
determines the window size. inflate() will then process raw deflate data,
651
not looking for a zlib or gzip header, not generating a check value, and not
652
looking for any check values for comparison at the end of the stream. This
653
is for use with other formats that use the deflate compressed data format
654
such as zip. Those formats provide their own check values. If a custom
655
format is developed using the raw deflate format for compressed data, it is
656
recommended that a check value such as an adler32 or a crc32 be applied to
657
the uncompressed data as is done in the zlib, gzip, and zip formats. For
658
most applications, the zlib format should be used as is. Note that comments
659
above on the use in deflateInit2() applies to the magnitude of windowBits.
661
windowBits can also be greater than 15 for optional gzip decoding. Add
662
32 to windowBits to enable zlib and gzip decoding with automatic header
663
detection, or add 16 to decode only the gzip format (the zlib format will
664
return a Z_DATA_ERROR. If a gzip stream is being decoded, strm->adler is
665
a crc32 instead of an adler32.
667
inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
668
memory, Z_STREAM_ERROR if a parameter is invalid (such as a negative
669
memLevel). msg is set to null if there is no error message. inflateInit2
670
does not perform any decompression apart from reading the zlib header if
671
present: this will be done by inflate(). (So next_in and avail_in may be
672
modified, but next_out and avail_out are unchanged.)
675
ZEXTERN int Q_ZEXPORT inflateSetDictionary OF((z_streamp strm,
676
const Bytef *dictionary,
679
Initializes the decompression dictionary from the given uncompressed byte
680
sequence. This function must be called immediately after a call of inflate
681
if this call returned Z_NEED_DICT. The dictionary chosen by the compressor
682
can be determined from the adler32 value returned by this call of
683
inflate. The compressor and decompressor must use exactly the same
684
dictionary (see deflateSetDictionary).
686
inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
687
parameter is invalid (such as NULL dictionary) or the stream state is
688
inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the
689
expected one (incorrect adler32 value). inflateSetDictionary does not
690
perform any decompression: this will be done by subsequent calls of
694
ZEXTERN int Q_ZEXPORT inflateSync OF((z_streamp strm));
696
Skips invalid compressed data until a full flush point (see above the
697
description of deflate with Z_FULL_FLUSH) can be found, or until all
698
available input is skipped. No output is provided.
700
inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR
701
if no more input was provided, Z_DATA_ERROR if no flush point has been found,
702
or Z_STREAM_ERROR if the stream structure was inconsistent. In the success
703
case, the application may save the current current value of total_in which
704
indicates where valid compressed data was found. In the error case, the
705
application may repeatedly call inflateSync, providing more input each time,
706
until success or end of the input data.
709
ZEXTERN int ZEXPORT inflateCopy OF((z_streamp dest,
712
Sets the destination stream as a complete copy of the source stream.
714
This function can be useful when randomly accessing a large stream. The
715
first pass through the stream can periodically record the inflate state,
716
allowing restarting inflate at those points when randomly accessing the
719
inflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
720
enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
721
(such as zalloc being NULL). msg is left unchanged in both source and
725
ZEXTERN int Q_ZEXPORT inflateReset OF((z_streamp strm));
727
This function is equivalent to inflateEnd followed by inflateInit,
728
but does not free and reallocate all the internal decompression state.
729
The stream will keep attributes that may have been set by inflateInit2.
731
inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
732
stream state was inconsistent (such as zalloc or state being NULL).
736
ZEXTERN int ZEXPORT inflateBackInit OF((z_stream FAR *strm, int windowBits,
737
unsigned char FAR *window));
739
Initialize the internal stream state for decompression using inflateBack()
740
calls. The fields zalloc, zfree and opaque in strm must be initialized
741
before the call. If zalloc and zfree are Z_NULL, then the default library-
742
derived memory allocation routines are used. windowBits is the base two
743
logarithm of the window size, in the range 8..15. window is a caller
744
supplied buffer of that size. Except for special applications where it is
745
assured that deflate was used with small window sizes, windowBits must be 15
746
and a 32K byte window must be supplied to be able to decompress general
749
See inflateBack() for the usage of these routines.
751
inflateBackInit will return Z_OK on success, Z_STREAM_ERROR if any of
752
the paramaters are invalid, Z_MEM_ERROR if the internal state could not
753
be allocated, or Z_VERSION_ERROR if the version of the library does not
754
match the version of the header file.
757
typedef unsigned (*in_func) OF((void FAR *, unsigned char FAR * FAR *));
758
typedef int (*out_func) OF((void FAR *, unsigned char FAR *, unsigned));
760
ZEXTERN int ZEXPORT inflateBack OF((z_stream FAR *strm,
761
in_func in, void FAR *in_desc,
762
out_func out, void FAR *out_desc));
764
inflateBack() does a raw inflate with a single call using a call-back
765
interface for input and output. This is more efficient than inflate() for
766
file i/o applications in that it avoids copying between the output and the
767
sliding window by simply making the window itself the output buffer. This
768
function trusts the application to not change the output buffer passed by
769
the output function, at least until inflateBack() returns.
771
inflateBackInit() must be called first to allocate the internal state
772
and to initialize the state with the user-provided window buffer.
773
inflateBack() may then be used multiple times to inflate a complete, raw
774
deflate stream with each call. inflateBackEnd() is then called to free
777
A raw deflate stream is one with no zlib or gzip header or trailer.
778
This routine would normally be used in a utility that reads zip or gzip
779
files and writes out uncompressed files. The utility would decode the
780
header and process the trailer on its own, hence this routine expects
781
only the raw deflate stream to decompress. This is different from the
782
normal behavior of inflate(), which expects either a zlib or gzip header and
783
trailer around the deflate stream.
785
inflateBack() uses two subroutines supplied by the caller that are then
786
called by inflateBack() for input and output. inflateBack() calls those
787
routines until it reads a complete deflate stream and writes out all of the
788
uncompressed data, or until it encounters an error. The function's
789
parameters and return types are defined above in the in_func and out_func
790
typedefs. inflateBack() will call in(in_desc, &buf) which should return the
791
number of bytes of provided input, and a pointer to that input in buf. If
792
there is no input available, in() must return zero--buf is ignored in that
793
case--and inflateBack() will return a buffer error. inflateBack() will call
794
out(out_desc, buf, len) to write the uncompressed data buf[0..len-1]. out()
795
should return zero on success, or non-zero on failure. If out() returns
796
non-zero, inflateBack() will return with an error. Neither in() nor out()
797
are permitted to change the contents of the window provided to
798
inflateBackInit(), which is also the buffer that out() uses to write from.
799
The length written by out() will be at most the window size. Any non-zero
800
amount of input may be provided by in().
802
For convenience, inflateBack() can be provided input on the first call by
803
setting strm->next_in and strm->avail_in. If that input is exhausted, then
804
in() will be called. Therefore strm->next_in must be initialized before
805
calling inflateBack(). If strm->next_in is Z_NULL, then in() will be called
806
immediately for input. If strm->next_in is not Z_NULL, then strm->avail_in
807
must also be initialized, and then if strm->avail_in is not zero, input will
808
initially be taken from strm->next_in[0 .. strm->avail_in - 1].
810
The in_desc and out_desc parameters of inflateBack() is passed as the
811
first parameter of in() and out() respectively when they are called. These
812
descriptors can be optionally used to pass any information that the caller-
813
supplied in() and out() functions need to do their job.
815
On return, inflateBack() will set strm->next_in and strm->avail_in to
816
pass back any unused input that was provided by the last in() call. The
817
return values of inflateBack() can be Z_STREAM_END on success, Z_BUF_ERROR
818
if in() or out() returned an error, Z_DATA_ERROR if there was a format
819
error in the deflate stream (in which case strm->msg is set to indicate the
820
nature of the error), or Z_STREAM_ERROR if the stream was not properly
821
initialized. In the case of Z_BUF_ERROR, an input or output error can be
822
distinguished using strm->next_in which will be Z_NULL only if in() returned
823
an error. If strm->next is not Z_NULL, then the Z_BUF_ERROR was due to
824
out() returning non-zero. (in() will always be called before out(), so
825
strm->next_in is assured to be defined if out() returns non-zero.) Note
826
that inflateBack() cannot return Z_OK.
829
ZEXTERN int ZEXPORT inflateBackEnd OF((z_stream FAR *strm));
831
All memory allocated by inflateBackInit() is freed.
833
inflateBackEnd() returns Z_OK on success, or Z_STREAM_ERROR if the stream
834
state was inconsistent.
837
ZEXTERN uLong ZEXPORT zlibCompileFlags OF((void));
838
/* Return flags indicating compile-time options.
840
Type sizes, two bits each, 00 = 16 bits, 01 = 32, 10 = 64, 11 = other:
843
5.4: size of voidpf (pointer)
846
Compiler, assembler, and debug options:
848
9: ASMV or ASMINF -- use ASM code
849
10: ZLIB_WINAPI -- exported functions use the WINAPI calling convention
852
One-time table building (smaller code, but not thread-safe if true):
853
12: BUILDFIXED -- build static block decoding tables when needed
854
13: DYNAMIC_CRC_TABLE -- build CRC calculation tables when needed
857
Library content (indicates missing functionality):
858
16: NO_GZCOMPRESS -- gz* functions cannot compress (to avoid linking
859
deflate code when not needed)
860
17: NO_GZIP -- deflate can't write gzip streams, and inflate can't detect
861
and decode gzip streams (to avoid linking crc code)
864
Operation variations (changes in library functionality):
865
20: PKZIP_BUG_WORKAROUND -- slightly more permissive inflate
866
21: FASTEST -- deflate algorithm with only one, lowest compression level
869
The sprintf variant used by gzprintf (zero is best):
870
24: 0 = vs*, 1 = s* -- 1 means limited to 20 arguments after the format
871
25: 0 = *nprintf, 1 = *printf -- 1 means gzprintf() not secure!
872
26: 0 = returns value, 1 = void -- 1 means inferred string length returned
879
/* utility functions */
882
The following utility functions are implemented on top of the
883
basic stream-oriented functions. To simplify the interface, some
884
default options are assumed (compression level and memory usage,
885
standard memory allocation functions). The source code of these
886
utility functions can easily be modified if you need special options.
889
ZEXTERN int Q_ZEXPORT compress OF((Bytef *dest, uLongf *destLen,
890
const Bytef *source, uLong sourceLen));
892
Compresses the source buffer into the destination buffer. sourceLen is
893
the byte length of the source buffer. Upon entry, destLen is the total
894
size of the destination buffer, which must be at least the value returned
895
by compressBound(sourceLen). Upon exit, destLen is the actual size of the
897
This function can be used to compress a whole file at once if the
898
input file is mmap'ed.
899
compress returns Z_OK if success, Z_MEM_ERROR if there was not
900
enough memory, Z_BUF_ERROR if there was not enough room in the output
904
ZEXTERN int Q_ZEXPORT compress2 OF((Bytef *dest, uLongf *destLen,
905
const Bytef *source, uLong sourceLen,
908
Compresses the source buffer into the destination buffer. The level
909
parameter has the same meaning as in deflateInit. sourceLen is the byte
910
length of the source buffer. Upon entry, destLen is the total size of the
911
destination buffer, which must be at least the value returned by
912
compressBound(sourceLen). Upon exit, destLen is the actual size of the
915
compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
916
memory, Z_BUF_ERROR if there was not enough room in the output buffer,
917
Z_STREAM_ERROR if the level parameter is invalid.
920
ZEXTERN uLong ZEXPORT compressBound OF((uLong sourceLen));
922
compressBound() returns an upper bound on the compressed size after
923
compress() or compress2() on sourceLen bytes. It would be used before
924
a compress() or compress2() call to allocate the destination buffer.
927
ZEXTERN int Q_ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen,
928
const Bytef *source, uLong sourceLen));
930
Decompresses the source buffer into the destination buffer. sourceLen is
931
the byte length of the source buffer. Upon entry, destLen is the total
932
size of the destination buffer, which must be large enough to hold the
933
entire uncompressed data. (The size of the uncompressed data must have
934
been saved previously by the compressor and transmitted to the decompressor
935
by some mechanism outside the scope of this compression library.)
936
Upon exit, destLen is the actual size of the compressed buffer.
937
This function can be used to decompress a whole file at once if the
938
input file is mmap'ed.
940
uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
941
enough memory, Z_BUF_ERROR if there was not enough room in the output
942
buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete.
946
typedef voidp gzFile;
948
ZEXTERN gzFile Q_ZEXPORT gzopen OF((const char *path, const char *mode));
950
Opens a gzip (.gz) file for reading or writing. The mode parameter
951
is as in fopen ("rb" or "wb") but can also include a compression level
952
("wb9") or a strategy: 'f' for filtered data as in "wb6f", 'h' for
953
Huffman only compression as in "wb1h", or 'R' for run-length encoding
954
as in "wb1R". (See the description of deflateInit2 for more information
955
about the strategy parameter.)
957
gzopen can be used to read a file which is not in gzip format; in this
958
case gzread will directly read from the file without decompression.
960
gzopen returns NULL if the file could not be opened or if there was
961
insufficient memory to allocate the (de)compression state; errno
962
can be checked to distinguish the two cases (if errno is zero, the
963
zlib error is Z_MEM_ERROR). */
965
ZEXTERN gzFile Q_ZEXPORT gzdopen OF((int fd, const char *mode));
967
gzdopen() associates a gzFile with the file descriptor fd. File
968
descriptors are obtained from calls like open, dup, creat, pipe or
969
fileno (in the file has been previously opened with fopen).
970
The mode parameter is as in gzopen.
971
The next call of gzclose on the returned gzFile will also close the
972
file descriptor fd, just like fclose(fdopen(fd), mode) closes the file
973
descriptor fd. If you want to keep fd open, use gzdopen(dup(fd), mode).
974
gzdopen returns NULL if there was insufficient memory to allocate
975
the (de)compression state.
978
ZEXTERN int Q_ZEXPORT gzsetparams OF((gzFile file, int level, int strategy));
980
Dynamically update the compression level or strategy. See the description
981
of deflateInit2 for the meaning of these parameters.
982
gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not
986
ZEXTERN int Q_ZEXPORT gzread OF((gzFile file, voidp buf, unsigned len));
988
Reads the given number of uncompressed bytes from the compressed file.
989
If the input file was not in gzip format, gzread copies the given number
990
of bytes into the buffer.
991
gzread returns the number of uncompressed bytes actually read (0 for
992
end of file, -1 for error). */
994
ZEXTERN int Q_ZEXPORT gzwrite OF((gzFile file,
995
voidpc buf, unsigned len));
997
Writes the given number of uncompressed bytes into the compressed file.
998
gzwrite returns the number of uncompressed bytes actually written
999
(0 in case of error).
1002
ZEXTERN int ZEXPORTVA gzprintf OF((gzFile file, const char *format, ...));
1004
Converts, formats, and writes the args to the compressed file under
1005
control of the format string, as in fprintf. gzprintf returns the number of
1006
uncompressed bytes actually written (0 in case of error). The number of
1007
uncompressed bytes written is limited to 4095. The caller should assure that
1008
this limit is not exceeded. If it is exceeded, then gzprintf() will return
1009
return an error (0) with nothing written. In this case, there may also be a
1010
buffer overflow with unpredictable consequences, which is possible only if
1011
zlib was compiled with the insecure functions sprintf() or vsprintf()
1012
because the secure snprintf() or vsnprintf() functions were not available.
1015
ZEXTERN int Q_ZEXPORT gzputs OF((gzFile file, const char *s));
1017
Writes the given null-terminated string to the compressed file, excluding
1018
the terminating null character.
1019
gzputs returns the number of characters written, or -1 in case of error.
1022
ZEXTERN Q_ZEXPORT char * gzgets OF((gzFile file, char *buf, int len));
1024
Reads bytes from the compressed file until len-1 characters are read, or
1025
a newline character is read and transferred to buf, or an end-of-file
1026
condition is encountered. The string is then terminated with a null
1028
gzgets returns buf, or Z_NULL in case of error.
1031
ZEXTERN int Q_ZEXPORT gzputc OF((gzFile file, int c));
1033
Writes c, converted to an unsigned char, into the compressed file.
1034
gzputc returns the value that was written, or -1 in case of error.
1037
ZEXTERN int Q_ZEXPORT gzgetc OF((gzFile file));
1039
Reads one byte from the compressed file. gzgetc returns this byte
1040
or -1 in case of end of file or error.
1043
ZEXTERN int ZEXPORT gzungetc OF((int c, gzFile file));
1045
Push one character back onto the stream to be read again later.
1046
Only one character of push-back is allowed. gzungetc() returns the
1047
character pushed, or -1 on failure. gzungetc() will fail if a
1048
character has been pushed but not read yet, or if c is -1. The pushed
1049
character will be discarded if the stream is repositioned with gzseek()
1053
ZEXTERN int Q_ZEXPORT gzflush OF((gzFile file, int flush));
1055
Flushes all pending output into the compressed file. The parameter
1056
flush is as in the deflate() function. The return value is the zlib
1057
error number (see function gzerror below). gzflush returns Z_OK if
1058
the flush parameter is Z_FINISH and all output could be flushed.
1059
gzflush should be called only when strictly necessary because it can
1060
degrade compression.
1063
ZEXTERN z_off_t Q_ZEXPORT gzseek OF((gzFile file,
1064
z_off_t offset, int whence));
1066
Sets the starting position for the next gzread or gzwrite on the
1067
given compressed file. The offset represents a number of bytes in the
1068
uncompressed data stream. The whence parameter is defined as in lseek(2);
1069
the value SEEK_END is not supported.
1070
If the file is opened for reading, this function is emulated but can be
1071
extremely slow. If the file is opened for writing, only forward seeks are
1072
supported; gzseek then compresses a sequence of zeroes up to the new
1075
gzseek returns the resulting offset location as measured in bytes from
1076
the beginning of the uncompressed stream, or -1 in case of error, in
1077
particular if the file is opened for writing and the new starting position
1078
would be before the current position.
1081
ZEXTERN int Q_ZEXPORT gzrewind OF((gzFile file));
1083
Rewinds the given file. This function is supported only for reading.
1085
gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET)
1088
ZEXTERN z_off_t Q_ZEXPORT gztell OF((gzFile file));
1090
Returns the starting position for the next gzread or gzwrite on the
1091
given compressed file. This position represents a number of bytes in the
1092
uncompressed data stream.
1094
gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR)
1097
ZEXTERN int Q_ZEXPORT gzeof OF((gzFile file));
1099
Returns 1 when EOF has previously been detected reading the given
1100
input stream, otherwise zero.
1103
ZEXTERN int Q_ZEXPORT gzclose OF((gzFile file));
1105
Flushes all pending output if necessary, closes the compressed file
1106
and deallocates all the (de)compression state. The return value is the zlib
1107
error number (see function gzerror below).
1110
ZEXTERN Q_ZEXPORT const char * gzerror OF((gzFile file, int *errnum));
1112
Returns the error message for the last error which occurred on the
1113
given compressed file. errnum is set to zlib error number. If an
1114
error occurred in the file system and not in the compression library,
1115
errnum is set to Z_ERRNO and the application may consult errno
1116
to get the exact error code.
1119
ZEXTERN void ZEXPORT gzclearerr OF((gzFile file));
1121
Clears the error and end-of-file flags for file. This is analogous to the
1122
clearerr() function in stdio. This is useful for continuing to read a gzip
1123
file that is being written concurrently.
1126
/* checksum functions */
1129
These functions are not related to compression but are exported
1130
anyway because they might be useful in applications using the
1131
compression library.
1134
ZEXTERN uLong Q_ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
1137
Update a running Adler-32 checksum with the bytes buf[0..len-1] and
1138
return the updated checksum. If buf is NULL, this function returns
1139
the required initial value for the checksum.
1140
An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
1141
much faster. Usage example:
1143
uLong adler = adler32(0L, Z_NULL, 0);
1145
while (read_buffer(buffer, length) != EOF) {
1146
adler = adler32(adler, buffer, length);
1148
if (adler != original_adler) error();
1151
ZEXTERN uLong Q_ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len));
1153
Update a running crc with the bytes buf[0..len-1] and return the updated
1154
crc. If buf is NULL, this function returns the required initial value
1155
for the crc. Pre- and post-conditioning (one's complement) is performed
1156
within this function so it shouldn't be done by the application.
1159
uLong crc = crc32(0L, Z_NULL, 0);
1161
while (read_buffer(buffer, length) != EOF) {
1162
crc = crc32(crc, buffer, length);
1164
if (crc != original_crc) error();
1168
/* various hacks, don't look :) */
1170
/* deflateInit and inflateInit are macros to allow checking the zlib version
1171
* and the compiler's view of z_stream:
1173
ZEXTERN int Q_ZEXPORT deflateInit_ OF((z_streamp strm, int level,
1174
const char *version, int stream_size));
1175
ZEXTERN int Q_ZEXPORT inflateInit_ OF((z_streamp strm,
1176
const char *version, int stream_size));
1177
ZEXTERN int Q_ZEXPORT deflateInit2_ OF((z_streamp strm, int level, int method,
1178
int windowBits, int memLevel,
1179
int strategy, const char *version,
1181
ZEXTERN int Q_ZEXPORT inflateInit2_ OF((z_streamp strm, int windowBits,
1182
const char *version, int stream_size));
1183
ZEXTERN int ZEXPORT inflateBackInit_ OF((z_stream FAR *strm, int windowBits,
1184
unsigned char FAR *window,
1185
const char *version,
1187
#define deflateInit(strm, level) \
1188
deflateInit_((strm), (level), ZLIB_VERSION, sizeof(z_stream))
1189
#define inflateInit(strm) \
1190
inflateInit_((strm), ZLIB_VERSION, sizeof(z_stream))
1191
#define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
1192
deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
1193
(strategy), ZLIB_VERSION, sizeof(z_stream))
1194
#define inflateInit2(strm, windowBits) \
1195
inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))
1196
#define inflateBackInit(strm, windowBits, window) \
1197
inflateBackInit_((strm), (windowBits), (window), \
1198
ZLIB_VERSION, sizeof(z_stream))
1201
#if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL)
1202
struct internal_state {int dummy;}; /* hack for buggy compilers */
1205
ZEXTERN Q_ZEXPORT const char * zError OF((int));
1206
ZEXTERN int Q_ZEXPORT inflateSyncPoint OF((z_streamp z));
1207
ZEXTERN Q_ZEXPORT const uLongf * get_crc_table OF((void));
added
removed
src/3rdparty/zlib/zlib.h
