utf16encoding.cpp

This software aims to create an applet and panel tools to manage a wireless interface card, such as

//
// UTF16Encoding.cpp
//
// $Id: //poco/Main/Foundation/src/UTF16Encoding.cpp#5 $
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


#include "Foundation/UTF16Encoding.h"
#include "Foundation/ByteOrder.h"


Foundation_BEGIN


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);
}

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

	
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
}

	
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
}

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


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


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;
}


int UTF16Encoding::convert(int ch, unsigned char* bytes, int length) const
{
	if (ch <= 0xFFFF)
	{
		if (length >= 2)
		{
			UInt16 ch1 = _flipBytes ? ByteOrder::flipBytes((UInt16) ch) : (UInt16) ch;
			unsigned char* p = (unsigned char*) &ch;
			*bytes++ = *p++;
			*bytes++ = *p++;
		}
		return 2;
	}
	else
	{
		if (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;
	}
}


Foundation_END