poco/Foundation/src/StreamConverter.cpp

//
// StreamConverter.cpp
//
// $Id: //poco/svn/Foundation/src/StreamConverter.cpp#2 $
//
// Library: Foundation
// Package: Text
// Module:  StreamConverter
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


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


namespace Poco {


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;
				++_errors;
			}
		}
		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 charToInt(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)
{
	poco_ios_init(&_buf);
}


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


} // namespace Poco