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Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: 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	#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
	15	#pragma interface "zstream.h"
	16	#endif
	17
	18	#include "wx/defs.h"
	19
	20	#if wxUSE_ZLIB && wxUSE_STREAMS
	21
	22	#include "wx/stream.h"
	23
	24	// Compression level
	25	enum {
	26	wxZ_DEFAULT_COMPRESSION = -1,
	27	wxZ_NO_COMPRESSION = 0,
	28	wxZ_BEST_SPEED = 1,
	29	wxZ_BEST_COMPRESSION = 9
	30	};
	31
	32	// Flags
	33	enum {
	34	#if WXWIN_COMPATIBILITY_2_4
	35	wxZLIB_24COMPATIBLE = 4, // read v2.4.x data without error
	36	#endif
	37	wxZLIB_NO_HEADER = 0, // raw deflate stream, no header or checksum
	38	wxZLIB_ZLIB = 1, // zlib header and checksum
	39	wxZLIB_GZIP = 2, // gzip header and checksum, requires zlib 1.2.1+
	40	wxZLIB_AUTO = 3 // autodetect header zlib or gzip
	41	};
	42
	43	class WXDLLIMPEXP_BASE wxZlibInputStream: public wxFilterInputStream {
	44	public:
	45	wxZlibInputStream(wxInputStream& stream, int flags = wxZLIB_AUTO);
	46	virtual ~wxZlibInputStream();
	47
	48	char Peek() { return wxInputStream::Peek(); }
	49	wxFileOffset GetLength() const { return wxInputStream::GetLength(); }
	50
	51	static bool CanHandleGZip();
	52
	53	protected:
	54	size_t OnSysRead(void *buffer, size_t size);
	55	wxFileOffset OnSysTell() const { return m_pos; }
	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	#if WXWIN_COMPATIBILITY_2_4
	63	bool m_24compatibilty;
	64	#endif
	65
	66	DECLARE_NO_COPY_CLASS(wxZlibInputStream)
	67	};
	68
	69	class WXDLLIMPEXP_BASE wxZlibOutputStream: public wxFilterOutputStream {
	70	public:
	71	wxZlibOutputStream(wxOutputStream& stream, int level = -1, int flags = wxZLIB_ZLIB);
	72	virtual ~wxZlibOutputStream() { Close(); }
	73
	74	void Sync() { DoFlush(false); }
	75	bool Close();
	76	wxFileOffset GetLength() const { return m_pos; }
	77
	78	static bool CanHandleGZip();
	79
	80	protected:
	81	size_t OnSysWrite(const void *buffer, size_t size);
	82	wxFileOffset OnSysTell() const { return m_pos; }
	83
	84	virtual void DoFlush(bool final);
	85
	86	protected:
	87	size_t m_z_size;
	88	unsigned char *m_z_buffer;
	89	struct z_stream_s *m_deflate;
	90	wxFileOffset m_pos;
	91
	92	DECLARE_NO_COPY_CLASS(wxZlibOutputStream)
	93	};
	94
	95	#endif
	96	// wxUSE_ZLIB && wxUSE_STREAMS
	97
	98	#endif
	99	// _WX_WXZSTREAM_H__
	100