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StreamConverter.cpp

//
// StreamConverter.cpp
//
// $Id: //poco/1.3/Foundation/src/StreamConverter.cpp#1 $
//
// 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)
{
}


00057 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)
{
}


00070 StreamConverterBuf::~StreamConverterBuf()
{
}


00075 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 charToInt(c);
}


00158 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)
{
}


00202 InputStreamConverter::~InputStreamConverter()
{
}


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


00214 OutputStreamConverter::~OutputStreamConverter()
{
}


} // namespace Poco

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