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UTF16Encoding.cpp

//
// UTF16Encoding.cpp
//
// $Id: //poco/1.2/Foundation/src/UTF16Encoding.cpp#2 $
//
// Library: Foundation
// Package: Text
// Module:  UTF16Encoding
//
// 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/UTF16Encoding.h"
#include "Poco/ByteOrder.h"


namespace Poco {


const TextEncoding::CharacterMap UTF16Encoding::_charMap = 
{
      /* 00 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* 10 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* 20 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* 30 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* 40 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* 50 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* 60 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* 70 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* 80 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* 90 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* a0 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* b0 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* c0 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* d0 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* e0 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
      /* f0 */    -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 
};


UTF16Encoding::UTF16Encoding(ByteOrderType byteOrder)
{
      setByteOrder(byteOrder);
}

      
00071 UTF16Encoding::UTF16Encoding(int byteOrderMark)
{
      setByteOrder(byteOrderMark);
}

      
00077 UTF16Encoding::~UTF16Encoding()
{
}


UTF16Encoding::ByteOrderType UTF16Encoding::getByteOrder() const
{
#if defined(POCO_ARCH_BIG_ENDIAN)
      return _flipBytes ? LITTLE_ENDIAN_BYTE_ORDER : BIG_ENDIAN_BYTE_ORDER;
#else
      return _flipBytes ? BIG_ENDIAN_BYTE_ORDER : LITTLE_ENDIAN_BYTE_ORDER;
#endif
}

      
00092 void UTF16Encoding::setByteOrder(ByteOrderType byteOrder)
{
#if defined(POCO_ARCH_BIG_ENDIAN)
      _flipBytes = byteOrder == LITTLE_ENDIAN_BYTE_ORDER;
#else
      _flipBytes = byteOrder == BIG_ENDIAN_BYTE_ORDER;;
#endif
}

      
00102 void UTF16Encoding::setByteOrder(int byteOrderMark)
{
      _flipBytes = byteOrderMark != 0xFEFF;
}


00108 const TextEncoding::CharacterMap& UTF16Encoding::characterMap() const
{
      return _charMap;
}


00114 int UTF16Encoding::convert(const unsigned char* bytes) const
{
      UInt16 uc;
      unsigned char* p = (unsigned char*) &uc;
      *p++ = *bytes++;
      *p++ = *bytes++;
      return _flipBytes ? ByteOrder::flipBytes(uc) : uc;
}


00124 int UTF16Encoding::convert(int ch, unsigned char* bytes, int length) const
{
      if (ch <= 0xFFFF)
      {
            if (bytes && length >= 2)
            {
                  UInt16 ch1 = _flipBytes ? ByteOrder::flipBytes((UInt16) ch) : (UInt16) ch;
                  unsigned char* p = (unsigned char*) &ch1;
                  *bytes++ = *p++;
                  *bytes++ = *p++;
            }
            return 2;
      }
      else
      {
            if (bytes && length >= 4)
            {
                  int ch1 = ch - 0x10000;
                  UInt16 w1 = 0xD800 + ((ch1 >> 10) & 0x3FF);
                  UInt16 w2 = 0xDC00 + (ch1 & 0x3FF);
                  if (_flipBytes)
                  {
                        w1 = ByteOrder::flipBytes(w1);
                        w2 = ByteOrder::flipBytes(w2);
                  }
                  unsigned char* p = (unsigned char*) &w1;
                  *bytes++ = *p++;
                  *bytes++ = *p++;
                  p = (unsigned char*) &w2;
                  *bytes++ = *p++;
                  *bytes++ = *p++;
            }
            return 4;
      }
}


} // namespace Poco

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