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	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: zstream.h
	3	// Purpose: interface of wxZlibOutputStream
	4	// Author: wxWidgets team
	5	// RCS-ID: $Id$
	6	// Licence: wxWindows license
	7	/////////////////////////////////////////////////////////////////////////////
	8
	9
	10	/// Compression level
	11	enum wxZlibCompressionLevels {
	12	wxZ_DEFAULT_COMPRESSION = -1,
	13	wxZ_NO_COMPRESSION = 0,
	14	wxZ_BEST_SPEED = 1,
	15	wxZ_BEST_COMPRESSION = 9
	16	};
	17
	18	/// Flags
	19	enum wxZLibFlags {
	20	wxZLIB_NO_HEADER = 0, //!< raw deflate stream, no header or checksum
	21	wxZLIB_ZLIB = 1, //!< zlib header and checksum
	22	wxZLIB_GZIP = 2, //!< gzip header and checksum, requires zlib 1.2.1+
	23	wxZLIB_AUTO = 3 //!< autodetect header zlib or gzip
	24	};
	25
	26
	27	/**
	28	@class wxZlibOutputStream
	29
	30	This stream compresses all data written to it.
	31
	32	The compressed output can be in zlib or gzip format.
	33	Note that writing the gzip format requires zlib version 1.2.1 or greater
	34	(the builtin version does support gzip format).
	35
	36	The stream is not seekable, wxOutputStream::SeekO() returns
	37	::wxInvalidOffset.
	38
	39	@library{wxbase}
	40	@category{archive,streams}
	41
	42	@see wxOutputStream, wxZlibInputStream
	43	*/
	44	class wxZlibOutputStream : public wxFilterOutputStream
	45	{
	46	public:
	47	//@{
	48	/**
	49	Creates a new write-only compressed stream.
	50
	51	@a level means level of compression. It is number between 0 and 9
	52	(including these values) where 0 means no compression and 9 best but
	53	slowest compression. -1 is default value (currently equivalent to 6).
	54
	55	If the parent stream is passed as a pointer then the new filter stream
	56	takes ownership of it. If it is passed by reference then it does not.
	57
	58	The @a flags wxZLIB_ZLIB and wxZLIB_GZIP specify whether the output data
	59	will be in zlib or gzip format. wxZLIB_ZLIB is the default.
	60
	61	If @a flags is wxZLIB_NO_HEADER, then a raw deflate stream is output
	62	without either zlib or gzip headers. This is a lower level mode, which
	63	is not usually used directly. It can be used to embed a raw deflate
	64	stream in a higher level protocol.
	65
	66	The values of the ::wxZlibCompressionLevels and ::wxZLibFlags
	67	enumerations can be used.
	68	*/
	69	wxZlibOutputStream(wxOutputStream& stream, int level = -1,
	70	int flags = wxZLIB_ZLIB);
	71	wxZlibOutputStream(wxOutputStream* stream, int level = -1,
	72	int flags = wxZLIB_ZLIB);
	73	//@}
	74
	75	/**
	76	Returns @true if zlib library in use can handle gzip compressed data.
	77	*/
	78	static bool CanHandleGZip();
	79
	80	//@{
	81	/**
	82	Sets the dictionary to the specified chunk of data. This can improve
	83	compression rate but note that the dictionary has to be the same when
	84	you deflate the data as when you inflate the data, otherwise you
	85	will inflate corrupted data.
	86
	87	Returns @true if the dictionary was successfully set.
	88	*/
	89	bool SetDictionary(const char *data, const size_t datalen);
	90	bool SetDictionary(const wxMemoryBuffer &buf);
	91	//@}
	92	};
	93
	94
	95
	96	/**
	97	@class wxZlibInputStream
	98
	99	This filter stream decompresses a stream that is in zlib or gzip format.
	100	Note that reading the gzip format requires zlib version 1.2.1 or greater,
	101	(the builtin version does support gzip format).
	102
	103	The stream is not seekable, wxInputStream::SeekI returns ::wxInvalidOffset.
	104	Also wxStreamBase::GetSize() is not supported, it always returns 0.
	105
	106	@library{wxbase}
	107	@category{archive,streams}
	108
	109	@see wxInputStream, wxZlibOutputStream.
	110	*/
	111	class wxZlibInputStream : public wxFilterInputStream
	112	{
	113	public:
	114	//@{
	115	/**
	116	If the parent stream is passed as a pointer then the new filter stream
	117	takes ownership of it. If it is passed by reference then it does not.
	118
	119	The @a flags wxZLIB_ZLIB and wxZLIB_GZIP specify whether the input data
	120	is in zlib or gzip format. If wxZLIB_AUTO is used, then zlib will
	121	autodetect the stream type, this is the default.
	122
	123	If @a flags is wxZLIB_NO_HEADER, then the data is assumed to be a raw
	124	deflate stream without either zlib or gzip headers. This is a lower level
	125	mode, which is not usually used directly. It can be used to read a raw
	126	deflate stream embedded in a higher level protocol.
	127
	128	The values of the ::wxZLibFlags enumeration can be used.
	129	*/
	130	wxZlibInputStream(wxInputStream& stream, int flags = wxZLIB_AUTO);
	131	wxZlibInputStream(wxInputStream* stream, int flags = wxZLIB_AUTO);
	132	//@}
	133
	134	/**
	135	Returns @true if zlib library in use can handle gzip compressed data.
	136	*/
	137	static bool CanHandleGZip();
	138
	139	//@{
	140	/**
	141	Sets the dictionary to the specified chunk of data. This can improve
	142	compression rate but note that the dictionary has to be the same when
	143	you deflate the data as when you inflate the data, otherwise you
	144	will inflate corrupted data.
	145
	146	Returns @true if the dictionary was successfully set.
	147	*/
	148	bool SetDictionary(const char *data, const size_t datalen);
	149	bool SetDictionary(const wxMemoryBuffer &buf);
	150	//@}
	151	};
	152