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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 {
	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 {
	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	protected:
	48	size_t OnSysRead(void *buffer, size_t size);
	49	wxFileOffset OnSysTell() const { return m_pos; }
	50
	51	private:
	52	void Init(int flags);
	53
	54	protected:
	55	size_t m_z_size;
	56	unsigned char *m_z_buffer;
	57	struct z_stream_s *m_inflate;
	58	wxFileOffset m_pos;
	59
	60	DECLARE_NO_COPY_CLASS(wxZlibInputStream)
	61	};
	62
	63	class WXDLLIMPEXP_BASE wxZlibOutputStream: public wxFilterOutputStream {
	64	public:
	65	wxZlibOutputStream(wxOutputStream& stream, int level = -1, int flags = wxZLIB_ZLIB);
	66	wxZlibOutputStream(wxOutputStream *stream, int level = -1, int flags = wxZLIB_ZLIB);
	67	virtual ~wxZlibOutputStream() { Close(); }
	68
	69	void Sync() { DoFlush(false); }
	70	bool Close();
	71	wxFileOffset GetLength() const { return m_pos; }
	72
	73	static bool CanHandleGZip();
	74
	75	protected:
	76	size_t OnSysWrite(const void *buffer, size_t size);
	77	wxFileOffset OnSysTell() const { return m_pos; }
	78
	79	virtual void DoFlush(bool final);
	80
	81	private:
	82	void Init(int level, int flags);
	83
	84	protected:
	85	size_t m_z_size;
	86	unsigned char *m_z_buffer;
	87	struct z_stream_s *m_deflate;
	88	wxFileOffset m_pos;
	89
	90	DECLARE_NO_COPY_CLASS(wxZlibOutputStream)
	91	};
	92
	93	class WXDLLIMPEXP_BASE wxZlibClassFactory: public wxFilterClassFactory
	94	{
	95	public:
	96	wxZlibClassFactory();
	97
	98	wxFilterInputStream *NewStream(wxInputStream& stream) const
	99	{ return new wxZlibInputStream(stream); }
	100	wxFilterOutputStream *NewStream(wxOutputStream& stream) const
	101	{ return new wxZlibOutputStream(stream, -1); }
	102	wxFilterInputStream NewStream(wxInputStream stream) const
	103	{ return new wxZlibInputStream(stream); }
	104	wxFilterOutputStream NewStream(wxOutputStream stream) const
	105	{ return new wxZlibOutputStream(stream, -1); }
	106
	107	const wxChar * const *GetProtocols(wxStreamProtocolType type
	108	= wxSTREAM_PROTOCOL) const;
	109
	110	private:
	111	DECLARE_DYNAMIC_CLASS(wxZlibClassFactory)
	112	};
	113
	114	class WXDLLIMPEXP_BASE wxGzipClassFactory: public wxFilterClassFactory
	115	{
	116	public:
	117	wxGzipClassFactory();
	118
	119	wxFilterInputStream *NewStream(wxInputStream& stream) const
	120	{ return new wxZlibInputStream(stream); }
	121	wxFilterOutputStream *NewStream(wxOutputStream& stream) const
	122	{ return new wxZlibOutputStream(stream, -1); }
	123	wxFilterInputStream NewStream(wxInputStream stream) const
	124	{ return new wxZlibInputStream(stream); }
	125	wxFilterOutputStream NewStream(wxOutputStream stream) const
	126	{ return new wxZlibOutputStream(stream, -1); }
	127
	128	const wxChar * const *GetProtocols(wxStreamProtocolType type
	129	= wxSTREAM_PROTOCOL) const;
	130
	131	private:
	132	DECLARE_DYNAMIC_CLASS(wxGzipClassFactory)
	133	};
	134
	135	#endif
	136	// wxUSE_ZLIB && wxUSE_STREAMS
	137
	138	#endif
	139	// _WX_WXZSTREAM_H__
	140