src/PlatformSupport/XalanUTF16Transcoder.cpp

/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2000-2002 The Apache Software Foundation.  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. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 4. The names "Xalan" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
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 *
 * 5. Products derived from this software may not be called "Apache",
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 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.ibm.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
#include "XalanUTF16Transcoder.hpp"



#include <cassert>



XalanUTF16Transcoder::XalanUTF16Transcoder() :
	XalanOutputTranscoder()
{
}



XalanUTF16Transcoder::~XalanUTF16Transcoder()
{
}



XalanUTF16Transcoder::eCode
XalanUTF16Transcoder::transcode(
			const XalanDOMChar*		theSourceData,
			size_t					theSourceCount,
			XalanXMLByte*			theTarget,
			size_t					theTargetSize,
			size_t&					theSourceCharsTranscoded,
			size_t&					theTargetBytesUsed)
{
	unsigned int	theSourceEaten = 0;
	unsigned int	theTargetPosition = 0;

	while(theSourceEaten < theSourceCount)
	{
		// Swap bytes to big endian...
		if (theTargetPosition + 1 >= theTargetSize)
		{
			break;
		}
		else
		{
#if defined(XALAN_OLD_STYLE_CASTS)
			*(XalanDOMChar*)(theTarget + theTargetPosition) = theSourceData[theSourceEaten++];
#else
			*reinterpret_cast<XalanDOMChar*>(theTarget + theTargetPosition) = theSourceData[theSourceEaten++];
#endif

			theTargetPosition += 2;
		}
	}

	theSourceCharsTranscoded = theSourceEaten;

	theTargetBytesUsed = theTargetPosition;

	return XalanTranscodingServices::OK;
}



XalanUTF16Transcoder::eCode
XalanUTF16Transcoder::transcode(
			const XalanXMLByte*		theSourceData,
			size_t					theSourceCount,
			XalanDOMChar*			theTarget,
			size_t					theTargetSize,
			size_t&					theSourceCharsTranscoded,
			size_t&					theTargetBytesUsed,
			unsigned char*			theCharSizes)
{
	unsigned int	theSourceEaten = 0;
	unsigned int	theTargetPosition = 0;

	while(theSourceEaten + 1 < theSourceCount)
	{
		// Swap bytes to big endian...
		if (theTargetPosition + 1 >= theTargetSize)
		{
			break;
		}
		else
		{
#if defined(XALAN_OLD_STYLE_CASTS)
			theTarget[theTargetPosition++] = *(const XalanDOMChar*)(theSourceData + theSourceCount++);
#else
			theTarget[theTargetPosition++] = *reinterpret_cast<const XalanDOMChar*>(theSourceData + theSourceCount++);
#endif

			*theCharSizes++ = 2;
		}
	}

	theSourceCharsTranscoded = theSourceEaten;

	theTargetBytesUsed = theTargetPosition;

	return XalanTranscodingServices::OK;
}



bool
XalanUTF16Transcoder::canTranscodeTo(unsigned int	/* theChar */) const
{
	return true;
}