streamconverter.cpp

This software aims to create an applet and panel tools to manage a wireless interface card, such as

//
// StreamConverter.cpp
//
// $Id: //poco/Main/Foundation/src/StreamConverter.cpp#5 $
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


#include "Foundation/StreamConverter.h"
#include "Foundation/TextEncoding.h"


Foundation_BEGIN


StreamConverterBuf::StreamConverterBuf(std::istream& istr, const TextEncoding& inEncoding, const TextEncoding& outEncoding, int defaultChar):
	_pIstr(&istr),
	_pOstr(0),
	_inEncoding(inEncoding),
	_outEncoding(outEncoding),
	_defaultChar(defaultChar),
	_sequenceLength(0),
	_pos(0),
	_errors(0)
{
}


StreamConverterBuf::StreamConverterBuf(std::ostream& ostr, const TextEncoding& inEncoding, const TextEncoding& outEncoding, int defaultChar):
	_pIstr(0),
	_pOstr(&ostr),
	_inEncoding(inEncoding),
	_outEncoding(outEncoding),
	_defaultChar(defaultChar),
	_sequenceLength(0),
	_pos(0),
	_errors(0)
{
}


StreamConverterBuf::~StreamConverterBuf()
{
}


int StreamConverterBuf::readFromDevice()
{
	poco_assert_dbg (_pIstr);

	if (_pos < _sequenceLength) return _buffer[_pos++];

	_pos = 0;
	_sequenceLength = 0;
	int c = _pIstr->get();
	if (c == -1) return -1;	

	poco_assert (c < 256);
	int uc;
	int n = _inEncoding.characterMap()[c];
	if (n == -1)
	{
		uc = _defaultChar;
		++_errors;
	}
	else if (n >= 0)
		uc = n;
	else
	{
		poco_assert_dbg(-n <= sizeof(_buffer));
		_buffer[0] = (unsigned char) c;
		_pIstr->read((char*) _buffer + 1, -n - 1);
		if (_pIstr->gcount() == -n - 1)
		{
			uc = _inEncoding.convert(_buffer);
			if (uc == -1) uc = _defaultChar;
		}
		else
		{
			uc = _defaultChar;
			++_errors;
		}
	}
	_sequenceLength = _outEncoding.convert(uc, _buffer, sizeof(_buffer));
	if (_sequenceLength == 0)
		_sequenceLength = _outEncoding.convert(_defaultChar, _buffer, sizeof(_buffer));
	if (_sequenceLength == 0)
		return -1;
	else
		return _buffer[_pos++];
}


int StreamConverterBuf::writeToDevice(char c)
{
	poco_assert_dbg (_pOstr);

	if (_sequenceLength == 0)
	{
		int n = _inEncoding.characterMap()[(unsigned char) c];
		if (n == -1)
		{
			++_errors;
			return -1;
		}
		_buffer[0] = (unsigned char) c;
		_sequenceLength = n < 0 ? -n : 1;
		_pos = 1;
	}
	else _buffer[_pos++] = (unsigned char) c;
	if (_pos == _sequenceLength)
	{
		int uc = _inEncoding.convert(_buffer);
		if (uc == -1)
		{
			++_errors; 
			return -1;
		}
		int n = _outEncoding.convert(uc, _buffer, sizeof(_buffer));
		if (n == 0) n = _outEncoding.convert(_defaultChar, _buffer, sizeof(_buffer));
		poco_assert_dbg (n <= sizeof(_buffer));
		_pOstr->write((char*) _buffer, n);
		_sequenceLength = 0;
		_pos = 0;
	}
	return c;
}


int StreamConverterBuf::errors() const
{
	return _errors;
}


StreamConverterIOS::StreamConverterIOS(std::istream& istr, const TextEncoding& inEncoding, const TextEncoding& outEncoding, int defaultChar): 
	_buf(istr, inEncoding, outEncoding, defaultChar)
{
	init(&_buf);
}


StreamConverterIOS::StreamConverterIOS(std::ostream& ostr, const TextEncoding& inEncoding, const TextEncoding& outEncoding, int defaultChar): 
	_buf(ostr, inEncoding, outEncoding, defaultChar)
{
	init(&_buf);
}


StreamConverterIOS::~StreamConverterIOS()
{
}


StreamConverterBuf* StreamConverterIOS::rdbuf()
{
	return &_buf;
}


int StreamConverterIOS::errors() const
{
	return _buf.errors();
}


InputStreamConverter::InputStreamConverter(std::istream& istr, const TextEncoding& inEncoding, const TextEncoding& outEncoding, int defaultChar): 
	StreamConverterIOS(istr, inEncoding, outEncoding, defaultChar),
	std::istream(&_buf)
{
}


InputStreamConverter::~InputStreamConverter()
{
}


OutputStreamConverter::OutputStreamConverter(std::ostream& ostr, const TextEncoding& inEncoding, const TextEncoding& outEncoding, int defaultChar): 
	StreamConverterIOS(ostr, inEncoding, outEncoding, defaultChar),
	std::ostream(&_buf)
{
}


OutputStreamConverter::~OutputStreamConverter()
{
}


Foundation_END