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Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: wx/zstream.h
	3	// Purpose: Memory stream classes
	4	// Author: Guilhem Lavaux
	5	// Modified by: Mike Wetherell
	6	// Created: 11/07/98
	7	// RCS-ID: $Id$
	8	// Copyright: (c) Guilhem Lavaux
	9	// Licence: wxWindows licence
	10	/////////////////////////////////////////////////////////////////////////////
	11	#ifndef _WX_WXZSTREAM_H__
	12	#define _WX_WXZSTREAM_H__
	13
	14	#include "wx/defs.h"
	15
	16	#if wxUSE_ZLIB && wxUSE_STREAMS
	17
	18	#include "wx/stream.h"
	19
	20	// Compression level
	21	enum wxZlibCompressionLevels {
	22	wxZ_DEFAULT_COMPRESSION = -1,
	23	wxZ_NO_COMPRESSION = 0,
	24	wxZ_BEST_SPEED = 1,
	25	wxZ_BEST_COMPRESSION = 9
	26	};
	27
	28	// Flags
	29	enum wxZLibFlags {
	30	wxZLIB_NO_HEADER = 0, // raw deflate stream, no header or checksum
	31	wxZLIB_ZLIB = 1, // zlib header and checksum
	32	wxZLIB_GZIP = 2, // gzip header and checksum, requires zlib 1.2.1+
	33	wxZLIB_AUTO = 3 // autodetect header zlib or gzip
	34	};
	35
	36	class WXDLLIMPEXP_BASE wxZlibInputStream: public wxFilterInputStream {
	37	public:
	38	wxZlibInputStream(wxInputStream& stream, int flags = wxZLIB_AUTO);
	39	wxZlibInputStream(wxInputStream *stream, int flags = wxZLIB_AUTO);
	40	virtual ~wxZlibInputStream();
	41
	42	char Peek() { return wxInputStream::Peek(); }
	43	wxFileOffset GetLength() const { return wxInputStream::GetLength(); }
	44
	45	static bool CanHandleGZip();
	46
	47	bool SetDictionary(const char *data, const size_t datalen);
	48	bool SetDictionary(const wxMemoryBuffer &buf);
	49
	50	protected:
	51	size_t OnSysRead(void *buffer, size_t size);
	52	wxFileOffset OnSysTell() const { return m_pos; }
	53
	54	private:
	55	void Init(int flags);
	56
	57	protected:
	58	size_t m_z_size;
	59	unsigned char *m_z_buffer;
	60	struct z_stream_s *m_inflate;
	61	wxFileOffset m_pos;
	62
	63	wxDECLARE_NO_COPY_CLASS(wxZlibInputStream);
	64	};
	65
	66	class WXDLLIMPEXP_BASE wxZlibOutputStream: public wxFilterOutputStream {
	67	public:
	68	wxZlibOutputStream(wxOutputStream& stream, int level = -1, int flags = wxZLIB_ZLIB);
	69	wxZlibOutputStream(wxOutputStream *stream, int level = -1, int flags = wxZLIB_ZLIB);
	70	virtual ~wxZlibOutputStream() { Close(); }
	71
	72	void Sync() { DoFlush(false); }
	73	bool Close();
	74	wxFileOffset GetLength() const { return m_pos; }
	75
	76	static bool CanHandleGZip();
	77
	78	bool SetDictionary(const char *data, const size_t datalen);
	79	bool SetDictionary(const wxMemoryBuffer &buf);
	80
	81	protected:
	82	size_t OnSysWrite(const void *buffer, size_t size);
	83	wxFileOffset OnSysTell() const { return m_pos; }
	84
	85	virtual void DoFlush(bool final);
	86
	87	private:
	88	void Init(int level, int flags);
	89
	90	protected:
	91	size_t m_z_size;
	92	unsigned char *m_z_buffer;
	93	struct z_stream_s *m_deflate;
	94	wxFileOffset m_pos;
	95
	96	wxDECLARE_NO_COPY_CLASS(wxZlibOutputStream);
	97	};
	98
	99	class WXDLLIMPEXP_BASE wxZlibClassFactory: public wxFilterClassFactory
	100	{
	101	public:
	102	wxZlibClassFactory();
	103
	104	wxFilterInputStream *NewStream(wxInputStream& stream) const
	105	{ return new wxZlibInputStream(stream); }
	106	wxFilterOutputStream *NewStream(wxOutputStream& stream) const
	107	{ return new wxZlibOutputStream(stream, -1); }
	108	wxFilterInputStream NewStream(wxInputStream stream) const
	109	{ return new wxZlibInputStream(stream); }
	110	wxFilterOutputStream NewStream(wxOutputStream stream) const
	111	{ return new wxZlibOutputStream(stream, -1); }
	112
	113	const wxChar * const *GetProtocols(wxStreamProtocolType type
	114	= wxSTREAM_PROTOCOL) const;
	115
	116	private:
	117	DECLARE_DYNAMIC_CLASS(wxZlibClassFactory)
	118	};
	119
	120	class WXDLLIMPEXP_BASE wxGzipClassFactory: public wxFilterClassFactory
	121	{
	122	public:
	123	wxGzipClassFactory();
	124
	125	wxFilterInputStream *NewStream(wxInputStream& stream) const
	126	{ return new wxZlibInputStream(stream); }
	127	wxFilterOutputStream *NewStream(wxOutputStream& stream) const
	128	{ return new wxZlibOutputStream(stream, -1); }
	129	wxFilterInputStream NewStream(wxInputStream stream) const
	130	{ return new wxZlibInputStream(stream); }
	131	wxFilterOutputStream NewStream(wxOutputStream stream) const
	132	{ return new wxZlibOutputStream(stream, -1); }
	133
	134	const wxChar * const *GetProtocols(wxStreamProtocolType type
	135	= wxSTREAM_PROTOCOL) const;
	136
	137	private:
	138	DECLARE_DYNAMIC_CLASS(wxGzipClassFactory)
	139	};
	140
	141	#endif
	142	// wxUSE_ZLIB && wxUSE_STREAMS
	143
	144	#endif
	145	// _WX_WXZSTREAM_H__
	146