/* zlib.h -- interface of the 'zlib' general purpose compression library
	version 1.0.4, Jul 24th, 1996.

	Copyright (C) 1995-1996 Jean-loup Gailly and Mark Adler

	This software is provided 'as-is', without any express or implied
	warranty.	In no event will the authors be held liable for any damages
	arising from the use of this software.

	Permission is granted to anyone to use this software for any purpose,
	including commercial applications, and to alter it and redistribute it
	freely, subject to the following restrictions:

	1. The origin of this software must not be misrepresented; you must not
	 claim that you wrote the original software. If you use this software
	 in a product, an acknowledgment in the product documentation would be
	 appreciated but is not required.
	2. Altered source versions must be plainly marked as such, and must not be
	 misrepresented as being the original software.
	3. This notice may not be removed or altered from any source distribution.

	Jean-loup Gailly		Mark Adler
	gzip@prep.ai.mit.edu	madler@alumni.caltech.edu


	The data format used by the zlib library is described by RFCs (Request for
	Comments) 1950 to 1952 in the files ftp://ds.internic.net/rfc/rfc1950.txt
	(zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format).
*/

#ifndef _ZLIB_H
#define _ZLIB_H

#ifdef __cplusplus
extern "C" {
#endif

#include "zconf.h"

#define ZLIB_VERSION "1.0.4"

/* 
	 The 'zlib' compression library provides in-memory compression and
	decompression functions, including integrity checks of the uncompressed
	data.	This version of the library supports only one compression method
	(deflation) but other algorithms may be added later and will have the same
	stream interface.

	 For compression the application must provide the output buffer and
	may optionally provide the input buffer for optimization. For decompression,
	the application must provide the input buffer and may optionally provide
	the output buffer for optimization.

	 Compression can be done in a single step if the buffers are large
	enough (for example if an input file is mmap'ed), or can be done by
	repeated calls of the compression function.	In the latter case, the
	application must provide more input and/or consume the output
	(providing more output space) before each call.

	 The library does not install any signal handler. It is recommended to
	add at least a handler for SIGSEGV when decompressing; the library checks
	the consistency of the input data whenever possible but may go nuts
	for some forms of corrupted input.
*/

typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
typedef void	(*free_func)	OF((voidpf opaque, voidpf address));

struct internal_state;

typedef struct z_stream_s {
	Bytef	*next_in;	/* next input byte */
	uInt	 avail_in;	/* number of bytes available at next_in */
	uLong	total_in;	/* total nb of input bytes read so far */

	Bytef	*next_out; /* next output byte should be put there */
	uInt	 avail_out; /* remaining free space at next_out */
	uLong	total_out; /* total nb of bytes output so far */

	char	 *msg;		/* last error message, NULL if no error */
	struct internal_state FAR *state; /* not visible by applications */

	alloc_func zalloc;	/* used to allocate the internal state */
	free_func	zfree;	/* used to free the internal state */
	voidpf	 opaque;	/* private data object passed to zalloc and zfree */

	int	 data_type;	/* best guess about the data type: ascii or binary */
	uLong	adler;		/* adler32 value of the uncompressed data */
	uLong	reserved;	/* reserved for future use */
} z_stream;

typedef z_stream FAR *z_streamp;

/*
	The application must update next_in and avail_in when avail_in has
	dropped to zero. It must update next_out and avail_out when avail_out
	has dropped to zero. The application must initialize zalloc, zfree and
	opaque before calling the init function. All other fields are set by the
	compression library and must not be updated by the application.

	The opaque value provided by the application will be passed as the first
	parameter for calls of zalloc and zfree. This can be useful for custom
	memory management. The compression library attaches no meaning to the
	opaque value.

	zalloc must return Z_NULL if there is not enough memory for the object.
	On 16-bit systems, the functions zalloc and zfree must be able to allocate
	exactly 65536 bytes, but will not be required to allocate more than this
	if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS,
	pointers returned by zalloc for objects of exactly 65536 bytes *must*
	have their offset normalized to zero. The default allocation function
	provided by this library ensures this (see zutil.c). To reduce memory
	requirements and avoid any allocation of 64K objects, at the expense of
	compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h).

	The fields total_in and total_out can be used for statistics or
	progress reports. After compression, total_in holds the total size of
	the uncompressed data and may be saved for use in the decompressor
	(particularly if the decompressor wants to decompress everything in
	a single step).
*/

						/* constants */

#define Z_NO_FLUSH		0
#define Z_PARTIAL_FLUSH 1
#define Z_SYNC_FLUSH	2
#define Z_FULL_FLUSH	3
#define Z_FINISH		4
/* Allowed flush values; see deflate() below for details */

#define Z_OK			0
#define Z_STREAM_END	1
#define Z_NEED_DICT	 2
#define Z_ERRNO		(-1)
#define Z_STREAM_ERROR (-2)
#define Z_DATA_ERROR	(-3)
#define Z_MEM_ERROR	(-4)
#define Z_BUF_ERROR	(-5)
#define Z_VERSION_ERROR (-6)
/* Return codes for the compression/decompression functions. Negative
 * values are errors, positive values are used for special but normal events.
 */

#define Z_NO_COMPRESSION		 0
#define Z_BEST_SPEED			 1
#define Z_BEST_COMPRESSION		9
#define Z_DEFAULT_COMPRESSION	(-1)
/* compression levels */

#define Z_FILTERED			1
#define Z_HUFFMAN_ONLY		2
#define Z_DEFAULT_STRATEGY	0
/* compression strategy; see deflateInit2() below for details */

#define Z_BINARY	0
#define Z_ASCII	1
#define Z_UNKNOWN	2
/* Possible values of the data_type field */

#define Z_DEFLATED	8
/* The deflate compression method (the only one supported in this version) */

#define Z_NULL	0	/* for initializing zalloc, zfree, opaque */

#define zlib_version zlibVersion()
/* for compatibility with versions < 1.0.2 */

						/* basic functions */

extern const char * EXPORT zlibVersion OF((void));
/* The application can compare zlibVersion and ZLIB_VERSION for consistency.
	If the first character differs, the library code actually used is
	not compatible with the zlib.h header file used by the application.
	This check is automatically made by deflateInit and inflateInit.
 */

/* 
extern int EXPORT deflateInit OF((z_streamp strm, int level));

	 Initializes the internal stream state for compression. The fields
	zalloc, zfree and opaque must be initialized before by the caller.
	If zalloc and zfree are set to Z_NULL, deflateInit updates them to
	use default allocation functions.

	 The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9:
	1 gives best speed, 9 gives best compression, 0 gives no compression at
	all (the input data is simply copied a block at a time).
	Z_DEFAULT_COMPRESSION requests a default compromise between speed and
	compression (currently equivalent to level 6).

	 deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
	enough memory, Z_STREAM_ERROR if level is not a valid compression level,
	Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible
	with the version assumed by the caller (ZLIB_VERSION).
	msg is set to null if there is no error message.	deflateInit does not
	perform any compression: this will be done by deflate().
*/


extern int EXPORT deflate OF((z_streamp strm, int flush));
/*
	Performs one or both of the following actions:

	- Compress more input starting at next_in and update next_in and avail_in
	accordingly. If not all input can be processed (because there is not
	enough room in the output buffer), next_in and avail_in are updated and
	processing will resume at this point for the next call of deflate().

	- Provide more output starting at next_out and update next_out and avail_out
	accordingly. This action is forced if the parameter flush is non zero.
	Forcing flush frequently degrades the compression ratio, so this parameter
	should be set only when necessary (in interactive applications).
	Some output may be provided even if flush is not set.

	Before the call of deflate(), the application should ensure that at least
	one of the actions is possible, by providing more input and/or consuming
	more output, and updating avail_in or avail_out accordingly; avail_out
	should never be zero before the call. The application can consume the
	compressed output when it wants, for example when the output buffer is full
	(avail_out == 0), or after each call of deflate(). If deflate returns Z_OK
	and with zero avail_out, it must be called again after making room in the
	output buffer because there might be more output pending.

	If the parameter flush is set to Z_PARTIAL_FLUSH, the current compression
	block is terminated and flushed to the output buffer so that the
	decompressor can get all input data available so far. For method 9, a future
	variant on method 8, the current block will be flushed but not terminated.
	Z_SYNC_FLUSH has the same effect as partial flush except that the compressed
	output is byte aligned (the compressor can clear its internal bit buffer)
	and the current block is always terminated; this can be useful if the
	compressor has to be restarted from scratch after an interruption (in which
	case the internal state of the compressor may be lost).
	If flush is set to Z_FULL_FLUSH, the compression block is terminated, a
	special marker is output and the compression dictionary is discarded; this
	is useful to allow the decompressor to synchronize if one compressed block
	has been damaged (see inflateSync below).	Flushing degrades compression and
	so should be used only when necessary.	Using Z_FULL_FLUSH too often can
	seriously degrade the compression. If deflate returns with avail_out == 0,
	this function must be called again with the same value of the flush
	parameter and more output space (updated avail_out), until the flush is
	complete (deflate returns with non-zero avail_out).

	If the parameter flush is set to Z_FINISH, pending input is processed,
	pending output is flushed and deflate returns with Z_STREAM_END if there
	was enough output space; if deflate returns with Z_OK, this function must be
	called again with Z_FINISH and more output space (updated avail_out) but no
	more input data, until it returns with Z_STREAM_END or an error. After
	deflate has returned Z_STREAM_END, the only possible operations on the
	stream are deflateReset or deflateEnd.
	
	Z_FINISH can be used immediately after deflateInit if all the compression
	is to be done in a single step. In this case, avail_out must be at least
	0.1% larger than avail_in plus 12 bytes.	If deflate does not return
	Z_STREAM_END, then it must be called again as described above.

	deflate() may update data_type if it can make a good guess about
	the input data type (Z_ASCII or Z_BINARY). In doubt, the data is considered
	binary. This field is only for information purposes and does not affect
	the compression algorithm in any manner.

	deflate() returns Z_OK if some progress has been made (more input
	processed or more output produced), Z_STREAM_END if all input has been
	consumed and all output has been produced (only when flush is set to
	Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example
	if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible.
*/


extern int EXPORT deflateEnd OF((z_streamp strm));
/*
	 All dynamically allocated data structures for this stream are freed.
	This function discards any unprocessed input and does not flush any
	pending output.

	 deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the
	stream state was inconsistent, Z_DATA_ERROR if the stream was freed
	prematurely (some input or output was discarded). In the error case,
	msg may be set but then points to a static string (which must not be
	deallocated).
*/


/* 
extern int EXPORT inflateInit OF((z_streamp strm));

	 Initializes the internal stream state for decompression. The fields
	zalloc, zfree and opaque must be initialized before by the caller.	If
	zalloc and zfree are set to Z_NULL, inflateInit updates them to use default
	allocation functions.

	 inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
	enough memory, Z_VERSION_ERROR if the zlib library version is incompatible
	with the version assumed by the caller.	msg is set to null if there is no
	error message. inflateInit does not perform any decompression: this will be
	done by inflate().
*/


extern int EXPORT inflate OF((z_streamp strm, int flush));
/*
	Performs one or both of the following actions:

	- Decompress more input starting at next_in and update next_in and avail_in
	accordingly. If not all input can be processed (because there is not
	enough room in the output buffer), next_in is updated and processing
	will resume at this point for the next call of inflate().

	- Provide more output starting at next_out and update next_out and avail_out
	accordingly.	inflate() provides as much output as possible, until there
	is no more input data or no more space in the output buffer (see below
	about the flush parameter).

	Before the call of inflate(), the application should ensure that at least
	one of the actions is possible, by providing more input and/or consuming
	more output, and updating the next_* and avail_* values accordingly.
	The application can consume the uncompressed output when it wants, for
	example when the output buffer is full (avail_out == 0), or after each
	call of inflate(). If inflate returns Z_OK and with zero avail_out, it
	must be called again after making room in the output buffer because there
	might be more output pending.

	If the parameter flush is set to Z_PARTIAL_FLUSH, inflate flushes as much
	output as possible to the output buffer. The flushing behavior of inflate is
	not specified for values of the flush parameter other than Z_PARTIAL_FLUSH
	and Z_FINISH, but the current implementation actually flushes as much output
	as possible anyway.

	inflate() should normally be called until it returns Z_STREAM_END or an
	error. However if all decompression is to be performed in a single step
	(a single call of inflate), the parameter flush should be set to
	Z_FINISH. In this case all pending input is processed and all pending
	output is flushed; avail_out must be large enough to hold all the
	uncompressed data. (The size of the uncompressed data may have been saved
	by the compressor for this purpose.) The next operation on this stream must
	be inflateEnd to deallocate the decompression state. The use of Z_FINISH
	is never required, but can be used to inform inflate that a faster routine
	may be used for the single inflate() call.

	inflate() returns Z_OK if some progress has been made (more input
	processed or more output produced), Z_STREAM_END if the end of the
	compressed data has been reached and all uncompressed output has been
	produced, Z_NEED_DICT if a preset dictionary is needed at this point (see
	inflateSetDictionary below), Z_DATA_ERROR if the input data was corrupted,
	Z_STREAM_ERROR if the stream structure was inconsistent (for example if
	next_in or next_out was NULL), Z_MEM_ERROR if there was not enough memory,
	Z_BUF_ERROR if no progress is possible or if there was not enough room in
	the output buffer when Z_FINISH is used. In the Z_DATA_ERROR case, the
	application may then call inflateSync to look for a good compression block.
	In the Z_NEED_DICT case, strm->adler is set to the Adler32 value of the
	dictionary chosen by the compressor.
*/


extern int EXPORT inflateEnd OF((z_streamp strm));
/*
	 All dynamically allocated data structures for this stream are freed.
	This function discards any unprocessed input and does not flush any
	pending output.

	 inflateEnd returns Z_OK if success, Z_STREAM_ERROR if the stream state
	was inconsistent. In the error case, msg may be set but then points to a
	static string (which must not be deallocated).
*/

						/* Advanced functions */

/*
	The following functions are needed only in some special applications.
*/

/*	
extern int EXPORT deflateInit2 OF((z_streamp strm,
									int	level,
									int	method,
									int	windowBits,
									int	memLevel,
									int	strategy));

	 This is another version of deflateInit with more compression options. The
	fields next_in, zalloc, zfree and opaque must be initialized before by
	the caller.

	 The method parameter is the compression method. It must be Z_DEFLATED in
	this version of the library. (Method 9 will allow a 64K history buffer and
	partial block flushes.)

	 The windowBits parameter is the base two logarithm of the window size
	(the size of the history buffer).	It should be in the range 8..15 for this
	version of the library (the value 16 will be allowed for method 9). Larger
	values of this parameter result in better compression at the expense of
	memory usage. The default value is 15 if deflateInit is used instead.

	 The memLevel parameter specifies how much memory should be allocated
	for the internal compression state. memLevel=1 uses minimum memory but
	is slow and reduces compression ratio; memLevel=9 uses maximum memory
	for optimal speed. The default value is 8. See zconf.h for total memory
	usage as a function of windowBits and memLevel.

	 The strategy parameter is used to tune the compression algorithm. Use the
	value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a
	filter (or predictor), or Z_HUFFMAN_ONLY to force Huffman encoding only (no
	string match).	Filtered data consists mostly of small values with a
	somewhat random distribution. In this case, the compression algorithm is
	tuned to compress them better. The effect of Z_FILTERED is to force more
	Huffman coding and less string matching; it is somewhat intermediate
	between Z_DEFAULT and Z_HUFFMAN_ONLY. The strategy parameter only affects
	the compression ratio but not the correctness of the compressed output even
	if it is not set appropriately.

	 If next_in is not null, the library will use this buffer to hold also
	some history information; the buffer must either hold the entire input
	data, or have at least 1<<(windowBits+1) bytes and be writable. If next_in
	is null, the library will allocate its own history buffer (and leave next_in
	null). next_out need not be provided here but must be provided by the
	application for the next call of deflate().

	 If the history buffer is provided by the application, next_in must
	must never be changed by the application since the compressor maintains
	information inside this buffer from call to call; the application
	must provide more input only by increasing avail_in. next_in is always
	reset by the library in this case.

		deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
	not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
	an invalid method). msg is set to null if there is no error message.
	deflateInit2 does not perform any compression: this will be done by
	deflate(). 
*/
							
extern int EXPORT deflateSetDictionary OF((z_streamp strm,
											const Bytef *dictionary,
						uInt	dictLength));
/*
	 Initializes the compression dictionary (history buffer) from the given
	byte sequence without producing any compressed output. This function must
	be called immediately after deflateInit or deflateInit2, before any call
	of deflate. The compressor and decompressor must use exactly the same
	dictionary (see inflateSetDictionary).
	 The dictionary should consist of strings (byte sequences) that are likely
	to be encountered later in the data to be compressed, with the most commonly
	used strings preferably put towards the end of the dictionary. Using a
	dictionary is most useful when the data to be compressed is short and
	can be predicted with good accuracy; the data can then be compressed better
	than with the default empty dictionary. In this version of the library,
	only the last 32K bytes of the dictionary are used.
	 Upon return of this function, strm->adler is set to the Adler32 value
	of the dictionary; the decompressor may later use this value to determine
	which dictionary has been used by the compressor. (The Adler32 value
	applies to the whole dictionary even if only a subset of the dictionary is
	actually used by the compressor.)

	 deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a
	parameter is invalid (such as NULL dictionary) or the stream state
	is inconsistent (for example if deflate has already been called for this
	stream). deflateSetDictionary does not perform any compression: this will
	be done by deflate(). 
*/

extern int EXPORT deflateCopy OF((z_streamp dest,
									z_streamp source));
/*
	 Sets the destination stream as a complete copy of the source stream.	If
	the source stream is using an application-supplied history buffer, a new
	buffer is allocated for the destination stream.	The compressed output
	buffer is always application-supplied. It's the responsibility of the
	application to provide the correct values of next_out and avail_out for the
	next call of deflate.

	 This function can be useful when several compression strategies will be
	tried, for example when there are several ways of pre-processing the input
	data with a filter. The streams that will be discarded should then be freed
	by calling deflateEnd.	Note that deflateCopy duplicates the internal
	compression state which can be quite large, so this strategy is slow and
	can consume lots of memory.

	 deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
	enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
	(such as zalloc being NULL). msg is left unchanged in both source and
	destination.
*/

extern int EXPORT deflateReset OF((z_streamp strm));
/*
	 This function is equivalent to deflateEnd followed by deflateInit,
	but does not free and reallocate all the internal compression state.
	The stream will keep the same compression level and any other attributes
	that may have been set by deflateInit2.

		deflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
	stream state was inconsistent (such as zalloc or state being NULL).
*/

extern int EXPORT deflateParams OF((z_streamp strm, int level, int strategy));
/*
	 Dynamically update the compression level and compression strategy.
	This can be used to switch between compression and straight copy of
	the input data, or to switch to a different kind of input data requiring
	a different strategy. If the compression level is changed, the input
	available so far is compressed with the old level (and may be flushed);
	the new level will take effect only at the next call of deflate().

	 Before the call of deflateParams, the stream state must be set as for
	a call of deflate(), since the currently available input may have to
	be compressed and flushed. In particular, strm->avail_out must be non-zero.

	 deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source
	stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR
	if strm->avail_out was zero.
*/

/*	
extern int EXPORT inflateInit2 OF((z_streamp strm,
									int	windowBits));

	 This is another version of inflateInit with more compression options. The
	fields next_out, zalloc, zfree and opaque must be initialized before by
	the caller.

	 The windowBits parameter is the base two logarithm of the maximum window
	size (the size of the history buffer).	It should be in the range 8..15 for
	this version of the library (the value 16 will be allowed soon). The
	default value is 15 if inflateInit is used instead. If a compressed stream
	with a larger window size is given as input, inflate() will return with
	the error code Z_DATA_ERROR instead of trying to allocate a larger window.

	 If next_out is not null, the library will use this buffer for the history
	buffer; the buffer must either be large enough to hold the entire output
	data, or have at least 1<<windowBits bytes.	If next_out is null, the
	library will allocate its own buffer (and leave next_out null). next_in
	need not be provided here but must be provided by the application for the
	next call of inflate().

	 If the history buffer is provided by the application, next_out must
	never be changed by the application since the decompressor maintains
	history information inside this buffer from call to call; the application
	can only reset next_out to the beginning of the history buffer when
	avail_out is zero and all output has been consumed.

		inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
	not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
	windowBits < 8). msg is set to null if there is no error message.
	inflateInit2 does not perform any decompression: this will be done by
	inflate().
*/

extern int EXPORT inflateSetDictionary OF((z_streamp strm,
						const Bytef *dictionary,
					uInt	dictLength));
/*
	 Initializes the decompression dictionary (history buffer) from the given
	uncompressed byte sequence. This function must be called immediately after
	a call of inflate if this call returned Z_NEED_DICT. The dictionary chosen
	by the compressor can be determined from the Adler32 value returned by this
	call of inflate. The compressor and decompressor must use exactly the same
	dictionary (see deflateSetDictionary).

	 inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
	parameter is invalid (such as NULL dictionary) or the stream state is
	inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the
	expected one (incorrect Adler32 value). inflateSetDictionary does not
	perform any decompression: this will be done by subsequent calls of
	inflate().
*/

extern int EXPORT inflateSync OF((z_streamp strm));
/* 
	Skips invalid compressed data until the special marker (see deflate()
	above) can be found, or until all available input is skipped. No output
	is provided.

	inflateSync returns Z_OK if the special marker has been found, Z_BUF_ERROR
	if no more input was provided, Z_DATA_ERROR if no marker has been found,
	or Z_STREAM_ERROR if the stream structure was inconsistent. In the success
	case, the application may save the current current value of total_in which
	indicates where valid compressed data was found. In the error case, the
	application may repeatedly call inflateSync, providing more input each time,
	until success or end of the input data.
*/

extern int EXPORT inflateReset OF((z_streamp strm));
/*
	 This function is equivalent to inflateEnd followed by inflateInit,
	but does not free and reallocate all the internal decompression state.
	The stream will keep attributes that may have been set by inflateInit2.

		inflateReset returns Z_OK if success, or Z_STREAM_ERROR if the source
	stream state was inconsistent (such as zalloc or state being NULL).
*/


						/* utility functions */

/*
	 The following utility functions are implemented on top of the
	basic stream-oriented functions. To simplify the interface, some
	default options are assumed (compression level, window size,
	standard memory allocation functions). The source code of these
	utility functions can easily be modified if you need special options.
*/

extern int EXPORT compress OF((Bytef *dest,	uLongf *destLen,
				const Bytef *source, uLong sourceLen));
/*
	 Compresses the source buffer into the destination buffer.	sourceLen is
	the byte length of the source buffer. Upon entry, destLen is the total
	size of the destination buffer, which must be at least 0.1% larger than
	sourceLen plus 12 bytes. Upon exit, destLen is the actual size of the
	compressed buffer.
	 This function can be used to compress a whole file at once if the
	input file is mmap'ed.
	 compress returns Z_OK if success, Z_MEM_ERROR if there was not
	enough memory, Z_BUF_ERROR if there was not enough room in the output
	buffer.
*/

extern int EXPORT uncompress OF((Bytef *dest,	uLongf *destLen,
				const Bytef *source, uLong sourceLen));
/*
	 Decompresses the source buffer into the destination buffer.	sourceLen is
	the byte length of the source buffer. Upon entry, destLen is the total
	size of the destination buffer, which must be large enough to hold the
	entire uncompressed data. (The size of the uncompressed data must have
	been saved previously by the compressor and transmitted to the decompressor
	by some mechanism outside the scope of this compression library.)
	Upon exit, destLen is the actual size of the compressed buffer.
	 This function can be used to decompress a whole file at once if the
	input file is mmap'ed.

	 uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
	enough memory, Z_BUF_ERROR if there was not enough room in the output
	buffer, or Z_DATA_ERROR if the input data was corrupted.
*/


typedef voidp gzFile;

extern gzFile EXPORT gzopen	OF((const char *path, const char *mode));
/*
	 Opens a gzip (.gz) file for reading or writing. The mode parameter
	is as in fopen ("rb" or "wb") but can also include a compression level
	("wb9").	gzopen can be used to read a file which is not in gzip format;
	in this case gzread will directly read from the file without decompression.
	 gzopen returns NULL if the file could not be opened or if there was
	insufficient memory to allocate the (de)compression state; errno
	can be checked to distinguish the two cases (if errno is zero, the
	zlib error is Z_MEM_ERROR).
*/

extern gzFile EXPORT gzdopen	OF((int fd, const char *mode));
/*
	 gzdopen() associates a gzFile with the file descriptor fd.	File
	descriptors are obtained from calls like open, dup, creat, pipe or
	fileno (in the file has been previously opened with fopen).
	The mode parameter is as in gzopen.
	 The next call of gzclose on the returned gzFile will also close the
	file descriptor fd, just like fclose(fdopen(fd), mode) closes the file
	descriptor fd. If you want to keep fd open, use gzdopen(dup(fd), mode).
	 gzdopen returns NULL if there was insufficient memory to allocate
	the (de)compression state.
*/

extern int EXPORT	gzread	OF((gzFile file, voidp buf, unsigned len));
/*
	 Reads the given number of uncompressed bytes from the compressed file.
	If the input file was not in gzip format, gzread copies the given number
	of bytes into the buffer.
	 gzread returns the number of uncompressed bytes actually read (0 for
	end of file, -1 for error). */

extern int EXPORT	gzwrite OF((gzFile file, const voidp buf, unsigned len));
/*
	 Writes the given number of uncompressed bytes into the compressed file.
	gzwrite returns the number of uncompressed bytes actually written
	(0 in case of error).
*/

extern int EXPORT	gzflush OF((gzFile file, int flush));
/*
	 Flushes all pending output into the compressed file. The parameter
	flush is as in the deflate() function. The return value is the zlib
	error number (see function gzerror below). gzflush returns Z_OK if
	the flush parameter is Z_FINISH and all output could be flushed.
	 gzflush should be called only when strictly necessary because it can
	degrade compression.
*/

extern int EXPORT	gzclose OF((gzFile file));
/*
	 Flushes all pending output if necessary, closes the compressed file
	and deallocates all the (de)compression state. The return value is the zlib
	error number (see function gzerror below).
*/

extern const char * EXPORT gzerror OF((gzFile file, int *errnum));
/*
	 Returns the error message for the last error which occurred on the
	given compressed file. errnum is set to zlib error number. If an
	error occurred in the file system and not in the compression library,
	errnum is set to Z_ERRNO and the application may consult errno
	to get the exact error code.
*/

						/* checksum functions */

/*
	 These functions are not related to compression but are exported
	anyway because they might be useful in applications using the
	compression library.
*/

extern uLong EXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));

/*
	 Update a running Adler-32 checksum with the bytes buf[0..len-1] and
	return the updated checksum. If buf is NULL, this function returns
	the required initial value for the checksum.
	An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
	much faster. Usage example:

	 uLong adler = adler32(0L, Z_NULL, 0);

	 while (read_buffer(buffer, length) != EOF) {
		adler = adler32(adler, buffer, length);
	 }
	 if (adler != original_adler) error();
*/

extern uLong EXPORT crc32	OF((uLong crc, const Bytef *buf, uInt len));
/*
	 Update a running crc with the bytes buf[0..len-1] and return the updated
	crc. If buf is NULL, this function returns the required initial value
	for the crc. Pre- and post-conditioning (one's complement) is performed
	within this function so it shouldn't be done by the application.
	Usage example:

	 uLong crc = crc32(0L, Z_NULL, 0);

	 while (read_buffer(buffer, length) != EOF) {
		crc = crc32(crc, buffer, length);
	 }
	 if (crc != original_crc) error();
*/


						/* various hacks, don't look :) */

/* deflateInit and inflateInit are macros to allow checking the zlib version
 * and the compiler's view of z_stream:
 */
extern int EXPORT deflateInit_ OF((z_streamp strm, int level,
					const char *version, int stream_size));
extern int EXPORT inflateInit_ OF((z_streamp strm,
				const char *version, int stream_size));
extern int EXPORT deflateInit2_ OF((z_streamp strm, int	level, int	method,
				 int windowBits, int memLevel, int strategy,
				 const char *version, int stream_size));
extern int EXPORT inflateInit2_ OF((z_streamp strm, int	windowBits,
				 const char *version, int stream_size));
#define deflateInit(strm, level) \
		deflateInit_((strm), (level),		ZLIB_VERSION, sizeof(z_stream))
#define inflateInit(strm) \
		inflateInit_((strm),				ZLIB_VERSION, sizeof(z_stream))
#define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
		deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
			(strategy),			ZLIB_VERSION, sizeof(z_stream))
#define inflateInit2(strm, windowBits) \
		inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))

#if !defined(_Z_UTIL_H) && !defined(NO_DUMMY_DECL)
	struct internal_state {int dummy;}; /* hack for buggy compilers */
#endif

uLongf *get_crc_table OF((void)); /* can be used by asm versions of crc32() */

#ifdef __cplusplus
}
#endif

#endif /* _ZLIB_H */
