text: //
  // Base64Encoder.cpp
  //
  // $Id: //poco/1.4/Foundation/src/Base64Encoder.cpp#2 $
  //
  // Library: Foundation
  // Package: Streams
  // Module:  Base64
  //
  // 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/Base64Encoder.h"
  
  
  namespace Poco {
  
  
  const unsigned char Base64EncoderBuf::OUT_ENCODING[64] =
  {
  	'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
  	'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
  	'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
  	'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
  	'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
  	'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
  	'w', 'x', 'y', 'z', '0', '1', '2', '3', 
  	'4', '5', '6', '7', '8', '9', '+', '/'
  };
  
  
  Base64EncoderBuf::Base64EncoderBuf(std::ostream& ostr): 
  	_groupLength(0),
  	_pos(0),
  	_lineLength(72),
  	_buf(*ostr.rdbuf())
  {
  }
  
  
  Base64EncoderBuf::~Base64EncoderBuf()
  {
  	try
  	{
  		close();
  	}
  	catch (...)
  	{
  	}
  }
  
  
  void Base64EncoderBuf::setLineLength(int lineLength)
  {
  	_lineLength = lineLength;
  }
  
  
  int Base64EncoderBuf::getLineLength() const
  {
  	return _lineLength;
  }
  
  
  int Base64EncoderBuf::writeToDevice(char c)
  {
  	static const int eof = std::char_traits<char>::eof();
  
  	_group[_groupLength++] = (unsigned char) c;
  	if (_groupLength == 3)
  	{
  		unsigned char idx;
  		idx = _group[0] >> 2;
  		if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
  		idx = ((_group[0] & 0x03) << 4) | (_group[1] >> 4);
  		if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
  		idx = ((_group[1] & 0x0F) << 2) | (_group[2] >> 6);
  		if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
  		idx = _group[2] & 0x3F;
  		if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
  		_pos += 4;
  		if (_lineLength > 0 && _pos >= _lineLength) 
  		{
  			if (_buf.sputc('\r') == eof) return eof;
  			if (_buf.sputc('\n') == eof) return eof;
  			_pos = 0;
  		}
  		_groupLength = 0;
  	}
  	return charToInt(c);
  }
  
  
  int Base64EncoderBuf::close()
  {
  	static const int eof = std::char_traits<char>::eof();
  
  	if (sync() == eof) return eof;
  	if (_groupLength == 1)
  	{
  		_group[1] = 0;
  		unsigned char idx;
  		idx = _group[0] >> 2;
  		if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
  		idx = ((_group[0] & 0x03) << 4) | (_group[1] >> 4);
  		if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
  		if (_buf.sputc('=') == eof) return eof;
  		if (_buf.sputc('=') == eof) return eof;
  	}
  	else if (_groupLength == 2)
  	{
  		_group[2] = 0;
  		unsigned char idx;
  		idx = _group[0] >> 2;
  		if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
  		idx = ((_group[0] & 0x03) << 4) | (_group[1] >> 4);
  		if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
  		idx = ((_group[1] & 0x0F) << 2) | (_group[2] >> 6);
  		if (_buf.sputc(OUT_ENCODING[idx]) == eof) return eof;
  		if (_buf.sputc('=') == eof) return eof;
  	}
  	_groupLength = 0;
  	return _buf.pubsync();
  }
  
  
  Base64EncoderIOS::Base64EncoderIOS(std::ostream& ostr): _buf(ostr)
  {
  	poco_ios_init(&_buf);
  }
  
  
  Base64EncoderIOS::~Base64EncoderIOS()
  {
  }
  
  
  int Base64EncoderIOS::close()
  {
  	return _buf.close();
  }
  
  
  Base64EncoderBuf* Base64EncoderIOS::rdbuf()
  {
  	return &_buf;
  }
  
  
  Base64Encoder::Base64Encoder(std::ostream& ostr): Base64EncoderIOS(ostr), std::ostream(&_buf)
  {
  }
  
  
  Base64Encoder::~Base64Encoder()
  {
  }
  
  
  } // namespace Poco
  