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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	#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	#if WXWIN_COMPATIBILITY_2_4
	31	wxZLIB_24COMPATIBLE = 4, // read v2.4.x data without error
	32	#endif
	33	wxZLIB_NO_HEADER = 0, // raw deflate stream, no header or checksum
	34	wxZLIB_ZLIB = 1, // zlib header and checksum
	35	wxZLIB_GZIP = 2, // gzip header and checksum, requires zlib 1.2.1+
	36	wxZLIB_AUTO = 3 // autodetect header zlib or gzip
	37	};
	38
	39	class WXDLLIMPEXP_BASE wxZlibInputStream: public wxFilterInputStream {
	40	public:
	41	wxZlibInputStream(wxInputStream& stream, int flags = wxZLIB_AUTO);
	42	virtual ~wxZlibInputStream();
	43
	44	char Peek() { return wxInputStream::Peek(); }
	45	wxFileOffset GetLength() const { return wxInputStream::GetLength(); }
	46
	47	static bool CanHandleGZip();
	48
	49	protected:
	50	size_t OnSysRead(void *buffer, size_t size);
	51	wxFileOffset OnSysTell() const { return m_pos; }
	52
	53	protected:
	54	size_t m_z_size;
	55	unsigned char *m_z_buffer;
	56	struct z_stream_s *m_inflate;
	57	wxFileOffset m_pos;
	58	#if WXWIN_COMPATIBILITY_2_4
	59	bool m_24compatibilty;
	60	#endif
	61
	62	DECLARE_NO_COPY_CLASS(wxZlibInputStream)
	63	};
	64
	65	class WXDLLIMPEXP_BASE wxZlibOutputStream: public wxFilterOutputStream {
	66	public:
	67	wxZlibOutputStream(wxOutputStream& stream, int level = -1, int flags = wxZLIB_ZLIB);
	68	virtual ~wxZlibOutputStream() { Close(); }
	69
	70	void Sync() { DoFlush(false); }
	71	bool Close();
	72	wxFileOffset GetLength() const { return m_pos; }
	73
	74	static bool CanHandleGZip();
	75
	76	protected:
	77	size_t OnSysWrite(const void *buffer, size_t size);
	78	wxFileOffset OnSysTell() const { return m_pos; }
	79
	80	virtual void DoFlush(bool final);
	81
	82	protected:
	83	size_t m_z_size;
	84	unsigned char *m_z_buffer;
	85	struct z_stream_s *m_deflate;
	86	wxFileOffset m_pos;
	87
	88	DECLARE_NO_COPY_CLASS(wxZlibOutputStream)
	89	};
	90
	91	#endif
	92	// wxUSE_ZLIB && wxUSE_STREAMS
	93
	94	#endif
	95	// _WX_WXZSTREAM_H__
	96