[pclasses-cvs] pclasses2/include/pclasses/IO ZLib.h,NONE,1.1

[Christian P. <cp...@us...>]

Update of /cvsroot/pclasses/pclasses2/include/pclasses/IO
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv18256/include/pclasses/IO

Added Files:
	ZLib.h 
Log Message:
Added zlib compression support (decompression will follow...) 

--- NEW FILE: ZLib.h ---
/***************************************************************************
 *   Copyright (C) 2004 by Christian Prochnow                              *
 *   cp...@se...                                                   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU Library General Public License as       *
 *   published by the Free Software Foundation; either version 2 of the    *
 *   License, or (at your option) any later version.                       *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this program; if not, write to the                 *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

#ifndef P_IO_ZLib_h
#define P_IO_ZLib_h
 
#include <pclasses/Exception.h>
#include <pclasses/IntTypes.h>
#include <string>

struct z_stream_s;
typedef z_stream_s z_stream;
 
namespace P {

namespace IO {

//! ZLib error
class ZLibError: public RuntimeError {
	public:
		ZLibError(int err, const char* msg, const char* what, const SourceInfo& si);
		~ZLibError();

		int errorNo() const throw();
		const std::string& msg() const throw();

	private:
		int _err;
		std::string _msg;
};

//! ZLib stream base
class ZLibStream {
	public:
		ZLibStream();
		virtual ~ZLibStream();

		//! Number of bytes available to consume
		size_t bytesAvail() const throw();

		//! Consume compressed data
		size_t read(char* buffer, size_t count) throw(ZLibError);

		//! Returns the crc32
		UInt32 crc32() const throw();

	protected:
		void put(const char* buffer, size_t count) throw(ZLibError);

		z_stream*  _strm;
		char*      _buffer;
		size_t     _bufferSize;
		UInt32     _crc32;
};

//! ZLib output (deflate) stream
class ZLibOutputStream: public ZLibStream {
	public:
		ZLibOutputStream(int level = 6) throw(ZLibError);
		~ZLibOutputStream() throw();

		//! Deflate (compress) buffer into output buffer
		size_t deflate(const char* buffer, size_t count) throw(ZLibError);

		//! Finish compression and reset state
		bool finish() throw(ZLibError);

		//! Reset stream
		void reset() throw(ZLibError);

	private:
		void putHeader();
		void putFooter();

		enum State {
			Ready,
			AboutToFinish,
			Finished
		};

		State _state;
};


} // !namespace IO

} // !namespace P

#endif