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Base64Encoder.cpp

//
// 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 (...)
      {
      }
}


00077 void Base64EncoderBuf::setLineLength(int lineLength)
{
      _lineLength = lineLength;
}


00083 int Base64EncoderBuf::getLineLength() const
{
      return _lineLength;
}


00089 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

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