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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	#include "wx/versioninfo.h"
	20
	21	// Compression level
	22	enum wxZlibCompressionLevels {
	23	wxZ_DEFAULT_COMPRESSION = -1,
	24	wxZ_NO_COMPRESSION = 0,
	25	wxZ_BEST_SPEED = 1,
	26	wxZ_BEST_COMPRESSION = 9
	27	};
	28
	29	// Flags
	30	enum wxZLibFlags {
	31	wxZLIB_NO_HEADER = 0, // raw deflate stream, no header or checksum
	32	wxZLIB_ZLIB = 1, // zlib header and checksum
	33	wxZLIB_GZIP = 2, // gzip header and checksum, requires zlib 1.2.1+
	34	wxZLIB_AUTO = 3 // autodetect header zlib or gzip
	35	};
	36
	37	class WXDLLIMPEXP_BASE wxZlibInputStream: public wxFilterInputStream {
	38	public:
	39	wxZlibInputStream(wxInputStream& stream, int flags = wxZLIB_AUTO);
	40	wxZlibInputStream(wxInputStream *stream, int flags = wxZLIB_AUTO);
	41	virtual ~wxZlibInputStream();
	42
	43	char Peek() { return wxInputStream::Peek(); }
	44	wxFileOffset GetLength() const { return wxInputStream::GetLength(); }
	45
	46	static bool CanHandleGZip();
	47
	48	bool SetDictionary(const char *data, const size_t datalen);
	49	bool SetDictionary(const wxMemoryBuffer &buf);
	50
	51	protected:
	52	size_t OnSysRead(void *buffer, size_t size);
	53	wxFileOffset OnSysTell() const { return m_pos; }
	54
	55	private:
	56	void Init(int flags);
	57
	58	protected:
	59	size_t m_z_size;
	60	unsigned char *m_z_buffer;
	61	struct z_stream_s *m_inflate;
	62	wxFileOffset m_pos;
	63
	64	wxDECLARE_NO_COPY_CLASS(wxZlibInputStream);
	65	};
	66
	67	class WXDLLIMPEXP_BASE wxZlibOutputStream: public wxFilterOutputStream {
	68	public:
	69	wxZlibOutputStream(wxOutputStream& stream, int level = -1, int flags = wxZLIB_ZLIB);
	70	wxZlibOutputStream(wxOutputStream *stream, int level = -1, int flags = wxZLIB_ZLIB);
	71	virtual ~wxZlibOutputStream() { Close(); }
	72
	73	void Sync() { DoFlush(false); }
	74	bool Close();
	75	wxFileOffset GetLength() const { return m_pos; }
	76
	77	static bool CanHandleGZip();
	78
	79	bool SetDictionary(const char *data, const size_t datalen);
	80	bool SetDictionary(const wxMemoryBuffer &buf);
	81
	82	protected:
	83	size_t OnSysWrite(const void *buffer, size_t size);
	84	wxFileOffset OnSysTell() const { return m_pos; }
	85
	86	virtual void DoFlush(bool final);
	87
	88	private:
	89	void Init(int level, int flags);
	90
	91	protected:
	92	size_t m_z_size;
	93	unsigned char *m_z_buffer;
	94	struct z_stream_s *m_deflate;
	95	wxFileOffset m_pos;
	96
	97	wxDECLARE_NO_COPY_CLASS(wxZlibOutputStream);
	98	};
	99
	100	class WXDLLIMPEXP_BASE wxZlibClassFactory: public wxFilterClassFactory
	101	{
	102	public:
	103	wxZlibClassFactory();
	104
	105	wxFilterInputStream *NewStream(wxInputStream& stream) const
	106	{ return new wxZlibInputStream(stream); }
	107	wxFilterOutputStream *NewStream(wxOutputStream& stream) const
	108	{ return new wxZlibOutputStream(stream, -1); }
	109	wxFilterInputStream NewStream(wxInputStream stream) const
	110	{ return new wxZlibInputStream(stream); }
	111	wxFilterOutputStream NewStream(wxOutputStream stream) const
	112	{ return new wxZlibOutputStream(stream, -1); }
	113
	114	const wxChar * const *GetProtocols(wxStreamProtocolType type
	115	= wxSTREAM_PROTOCOL) const;
	116
	117	private:
	118	DECLARE_DYNAMIC_CLASS(wxZlibClassFactory)
	119	};
	120
	121	class WXDLLIMPEXP_BASE wxGzipClassFactory: public wxFilterClassFactory
	122	{
	123	public:
	124	wxGzipClassFactory();
	125
	126	wxFilterInputStream *NewStream(wxInputStream& stream) const
	127	{ return new wxZlibInputStream(stream); }
	128	wxFilterOutputStream *NewStream(wxOutputStream& stream) const
	129	{ return new wxZlibOutputStream(stream, -1); }
	130	wxFilterInputStream NewStream(wxInputStream stream) const
	131	{ return new wxZlibInputStream(stream); }
	132	wxFilterOutputStream NewStream(wxOutputStream stream) const
	133	{ return new wxZlibOutputStream(stream, -1); }
	134
	135	const wxChar * const *GetProtocols(wxStreamProtocolType type
	136	= wxSTREAM_PROTOCOL) const;
	137
	138	private:
	139	DECLARE_DYNAMIC_CLASS(wxGzipClassFactory)
	140	};
	141
	142	WXDLLIMPEXP_BASE wxVersionInfo wxGetZlibVersionInfo();
	143
	144	#endif
	145	// wxUSE_ZLIB && wxUSE_STREAMS
	146
	147	#endif
	148	// _WX_WXZSTREAM_H__
	149