xref: /trunk/main/sax/source/expatwrap/saxwriter.cxx (revision cdf0e10c)

/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * Copyright 2000, 2010 Oracle and/or its affiliates.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
 *
 ************************************************************************/
#include <string.h>

#include <com/sun/star/lang/XServiceInfo.hpp>
#include <com/sun/star/util/XCloneable.hpp>
#include <com/sun/star/xml/sax/XExtendedDocumentHandler.hpp>
#include <com/sun/star/xml/sax/XParser.hpp>
#include <com/sun/star/xml/sax/SAXParseException.hpp>
#include <com/sun/star/xml/sax/SAXInvalidCharacterException.hpp>

#include <com/sun/star/io/XActiveDataSource.hpp>

#include <cppuhelper/factory.hxx>
#include <cppuhelper/weak.hxx>
#include <cppuhelper/implbase3.hxx>

#include <rtl/strbuf.hxx>
#include <rtl/byteseq.hxx>
#include <rtl/ustrbuf.hxx>

using namespace ::rtl;
using namespace ::std;
using namespace ::osl;
using namespace ::cppu;
using namespace ::com::sun::star::uno;
using namespace ::com::sun::star::lang;
using namespace ::com::sun::star::registry;
using namespace ::com::sun::star::xml::sax;
using namespace ::com::sun::star::util;
using namespace ::com::sun::star::io;

#include "factory.hxx"
#include "xml2utf.hxx"

#define LINEFEED 10
#define SEQUENCESIZE 1024
#define MAXCOLUMNCOUNT 72

/******
*
*
* Character conversion functions
*
*
*****/

namespace sax_expatwrap {
/*****
*
* Calculates the length of the sequence after conversion, but the conversion is not done.
* .g. &<>"' plus some more are
* special characters in XML that need to be transformed
*
* @param bConvertAll For Attributes it is necessary to convert every symbol (including line feed and tab)
*                    Set this to true, if you want to perform this special conversion
* @return The returned value is equal to the length of the incoming sequence, when no
+         conversion is necessary, otherwise it is larger than the length of the sequence.
****/
//  inline sal_Int32 CalcXMLLen( const Sequence<sal_Int8> & seq , sal_Bool bConvertAll ) throw()
//  {
//  	sal_Int32 nLen = 0;
//  	const sal_Int8 *pArray = seq.getConstArray();

//  	for( int i = 0 ; i < seq.getLength() ; i ++ ) {

//  		sal_Int8 c = pArray[i];
//  		switch( c )
//  		{
//  		case '&':       // resemble to &amp;
//  			nLen +=5;
//  			break;
//  		case '<':       // &lt;
//  		case '>':       // &gt;
//  			nLen +=4;
//  			break;
//  		case 39:        // 39 == ''', &apos;
//  		case '"':       // &quot;
//  		case 13:        // &#x0d;
//  			nLen += 6;
//  			break;

//  		case 10:        // &#x0a;
//  		case 9:         // &#x09;
//  			if( bConvertAll )
//  			{
//  				nLen += 6;		  //
//  			}
//  			break;
//  		default:
//  			nLen ++;
//  		}
//  	}

//  	return nLen;
//  }

enum SaxInvalidCharacterError
{
	SAX_NONE,
	SAX_WARNING,
	SAX_ERROR
};

class SaxWriterHelper
{
	Reference< XOutputStream >	m_out;
	Sequence < sal_Int8 >		m_Sequence;
	sal_Int8*					mp_Sequence;

	sal_Int32					nLastLineFeedPos; // is negative after writing a sequence
	sal_uInt32					nCurrentPos;
	sal_Bool					m_bStartElementFinished;


	inline sal_uInt32 writeSequence() throw( SAXException );

	// use only if to insert the bytes more space in the sequence is needed and
	// so the sequence has to write out and reset rPos to 0
	// writes sequence only on overflow, sequence could be full on the end (rPos == SEQUENCESIZE)
	inline void AddBytes(sal_Int8* pTarget, sal_uInt32& rPos,
				const sal_Int8* pBytes, sal_uInt32 nBytesCount) throw( SAXException );
	inline sal_Bool convertToXML(const sal_Unicode * pStr,
						sal_Int32 nStrLen,
						sal_Bool bDoNormalization,
						sal_Bool bNormalizeWhitespace,
						sal_Int8 *pTarget,
						sal_uInt32& rPos) throw( SAXException );
	inline void FinishStartElement() throw( SAXException );
public:
	SaxWriterHelper(Reference< XOutputStream > m_TempOut) :
		m_out(m_TempOut),
		m_Sequence(SEQUENCESIZE),
		mp_Sequence(NULL),
		nLastLineFeedPos(0),
		nCurrentPos(0),
		m_bStartElementFinished(sal_True)
	{
		OSL_ENSURE(SEQUENCESIZE > 50, "Sequence cache size to small");
		mp_Sequence = m_Sequence.getArray();
	}
	~SaxWriterHelper()
	{
		OSL_ENSURE(!nCurrentPos, "cached Sequence not written");
		OSL_ENSURE(m_bStartElementFinished, "StartElement not complettly written");
	}

	inline void insertIndentation(sal_uInt32 m_nLevel)  throw( SAXException );

// returns whether it works correct or invalid characters were in the string
// If there are invalid characters in the string it returns sal_False.
// Than the calling method has to throw the needed Exception.
	inline sal_Bool writeString(const rtl::OUString& rWriteOutString,
						sal_Bool bDoNormalization,
						sal_Bool bNormalizeWhitespace) throw( SAXException );

	sal_uInt32 GetLastColumnCount() { return (sal_uInt32)(nCurrentPos - nLastLineFeedPos); }

	inline void startDocument() throw( SAXException );

// returns whether it works correct or invalid characters were in the strings
// If there are invalid characters in one of the strings it returns sal_False.
// Than the calling method has to throw the needed Exception.
	inline SaxInvalidCharacterError startElement(const rtl::OUString& rName, const Reference< XAttributeList >& xAttribs) throw( SAXException );
	inline sal_Bool FinishEmptyElement() throw( SAXException );

// returns whether it works correct or invalid characters were in the string
// If there are invalid characters in the string it returns sal_False.
// Than the calling method has to throw the needed Exception.
	inline sal_Bool endElement(const rtl::OUString& rName) throw( SAXException );
	inline void endDocument() throw( SAXException );

// returns whether it works correct or invalid characters were in the strings
// If there are invalid characters in the string it returns sal_False.
// Than the calling method has to throw the needed Exception.
	inline sal_Bool processingInstruction(const rtl::OUString& rTarget, const rtl::OUString& rData) throw( SAXException );
	inline void startCDATA() throw( SAXException );
	inline void endCDATA() throw( SAXException );

// returns whether it works correct or invalid characters were in the strings
// If there are invalid characters in the string it returns sal_False.
// Than the calling method has to throw the needed Exception.
	inline sal_Bool comment(const rtl::OUString& rComment) throw( SAXException );

	inline void clearBuffer() throw( SAXException );
};

const sal_Bool g_bValidCharsBelow32[32] =
{
//  0 1 2 3 4 5 6 7
	0,0,0,0,0,0,0,0,  //0
	0,1,1,0,0,1,0,0,  //8
	0,0,0,0,0,0,0,0,  //16
	0,0,0,0,0,0,0,0
};

inline sal_Bool IsInvalidChar(const sal_Unicode aChar)
{
	sal_Bool bRet(sal_False);
	// check first for the most common characters
	if( aChar < 32 || aChar >= 0xd800 )
		bRet = ( (aChar < 32 && ! g_bValidCharsBelow32[aChar]) ||
			aChar == 0xffff ||
			aChar == 0xfffe );
	return bRet;
}

/********
* write through to the output stream
*
*****/
inline sal_uInt32 SaxWriterHelper::writeSequence() throw( SAXException )
{
	try
	{
		m_out->writeBytes( m_Sequence );
	}
	catch( IOException & e )
	{
		Any a;
		a <<= e;
		throw SAXException(
			OUString::createFromAscii( "io exception during writing" ),
			Reference< XInterface > (),
			a );
	}
	nLastLineFeedPos -= SEQUENCESIZE;
	return 0;
}

inline void SaxWriterHelper::AddBytes(sal_Int8* pTarget, sal_uInt32& rPos,
				const sal_Int8* pBytes, sal_uInt32 nBytesCount) throw( SAXException )
{
	OSL_ENSURE((rPos + nBytesCount) > SEQUENCESIZE, "wrong use of AddBytesMethod");
	sal_uInt32 nCount(SEQUENCESIZE - rPos);
	memcpy( &(pTarget[rPos]) , pBytes,  nCount);

	OSL_ENSURE(rPos + nCount == SEQUENCESIZE, "the position should be the at the end");

	rPos = writeSequence();
	sal_uInt32 nRestCount(nBytesCount - nCount);
	if ((rPos + nRestCount) <= SEQUENCESIZE)
	{
		memcpy( &(pTarget[rPos]), &pBytes[nCount], nRestCount);
		rPos += nRestCount;
	}
	else
		AddBytes(pTarget, rPos, &pBytes[nCount], nRestCount);
}

/** Converts an UTF16 string to UTF8 and does XML normalization

	@param pTarget
	       Pointer to a piece of memory, to where the output should be written. The caller
		   must call calcXMLByteLength on the same string, to ensure,
		   that there is enough memory for converting.
 */
inline sal_Bool SaxWriterHelper::convertToXML( const sal_Unicode * pStr,
						sal_Int32 nStrLen,
						sal_Bool bDoNormalization,
						sal_Bool bNormalizeWhitespace,
						sal_Int8 *pTarget,
						sal_uInt32& rPos ) throw( SAXException )
{
	sal_Bool bRet(sal_True);
    sal_uInt32 nSurrogate = 0;

	for( sal_Int32 i = 0 ; i < nStrLen ; i ++ )
	{
	    sal_uInt16 c = pStr[i];
	    if (IsInvalidChar(c))
	    	bRet = sal_False;
	    else if( (c >= 0x0001) && (c <= 0x007F) )
		{
			if( bDoNormalization )
			{
				switch( c )
				{
					case '&':  // resemble to &amp;
					{
						if ((rPos + 5) > SEQUENCESIZE)
							AddBytes(pTarget, rPos, (sal_Int8*)"&amp;", 5);
						else
						{
							memcpy( &(pTarget[rPos]) , "&amp;", 5 );
							rPos += 5;
						}
					}
					break;
					case '<':
					{
						if ((rPos + 4) > SEQUENCESIZE)
							AddBytes(pTarget, rPos, (sal_Int8*)"&lt;", 4);
						else
						{
							memcpy( &(pTarget[rPos]) , "&lt;" , 4 );
							rPos += 4;        // &lt;
						}
					}
					break;
					case '>':
					{
						if ((rPos + 4) > SEQUENCESIZE)
							AddBytes(pTarget, rPos, (sal_Int8*)"&gt;", 4);
						else
						{
							memcpy( &(pTarget[rPos]) , "&gt;" , 4 );
							rPos += 4;        // &gt;
						}
					}
					break;
					case 39:                 // 39 == '''
					{
						if ((rPos + 6) > SEQUENCESIZE)
							AddBytes(pTarget, rPos, (sal_Int8*)"&apos;", 6);
						else
						{
							memcpy( &(pTarget[rPos]) , "&apos;" , 6 );
							rPos += 6;        // &apos;
						}
					}
					break;
					case '"':
					{
						if ((rPos + 6) > SEQUENCESIZE)
							AddBytes(pTarget, rPos, (sal_Int8*)"&quot;", 6);
						else
						{
							memcpy( &(pTarget[rPos]) , "&quot;" , 6 );
							rPos += 6;		  // &quot;
						}
					}
					break;
					case 13:
					{
						if ((rPos + 6) > SEQUENCESIZE)
							AddBytes(pTarget, rPos, (sal_Int8*)"&#x0d;", 6);
						else
						{
							memcpy( &(pTarget[rPos]) , "&#x0d;" , 6 );
							rPos += 6;
						}
					}
					break;
					case LINEFEED:
					{
						if( bNormalizeWhitespace )
						{
							if ((rPos + 6) > SEQUENCESIZE)
								AddBytes(pTarget, rPos, (sal_Int8*)"&#x0a;" , 6);
							else
							{
								memcpy( &(pTarget[rPos]) , "&#x0a;" , 6 );
								rPos += 6;
							}
						}
						else
						{
							pTarget[rPos] = LINEFEED;
							nLastLineFeedPos = rPos;
							rPos ++;
						}
					}
					break;
					case 9:
					{
						if( bNormalizeWhitespace )
						{
							if ((rPos + 6) > SEQUENCESIZE)
								AddBytes(pTarget, rPos, (sal_Int8*)"&#x09;" , 6);
							else
							{
								memcpy( &(pTarget[rPos]) , "&#x09;" , 6 );
								rPos += 6;
							}
						}
						else
						{
							pTarget[rPos] = 9;
							rPos ++;
						}
					}
					break;
					default:
					{
						pTarget[rPos] = (sal_Int8)c;
						rPos ++;
					}
					break;
				}
			}
			else
			{
				pTarget[rPos] = (sal_Int8)c;
				if ((sal_Int8)c == LINEFEED)
					nLastLineFeedPos = rPos;
				rPos ++;
			}
	    }
        else if( c >= 0xd800 && c < 0xdc00  )
        {
            // 1. surrogate: save (until 2. surrogate)
            OSL_ENSURE( nSurrogate == 0, "left-over Unicode surrogate" );
            nSurrogate = ( ( c & 0x03ff ) + 0x0040 );
        }
        else if( c >= 0xdc00 && c < 0xe000 )
        {
            // 2. surrogate: write as UTF-8
            OSL_ENSURE( nSurrogate != 0, "lone 2nd Unicode surrogate" );

            nSurrogate = ( nSurrogate << 10 ) | ( c & 0x03ff );
            if( nSurrogate >= 0x00010000  &&  nSurrogate <= 0x0010FFFF )
            {
    			sal_Int8 aBytes[] = { sal_Int8(0xF0 | ((nSurrogate >> 18) & 0x0F)),
	    							  sal_Int8(0x80 | ((nSurrogate >> 12) & 0x3F)),
		    						  sal_Int8(0x80 | ((nSurrogate >>  6) & 0x3F)),
			    					  sal_Int8(0x80 | ((nSurrogate >>  0) & 0x3F)) };
    			if ((rPos + 4) > SEQUENCESIZE)
	    			AddBytes(pTarget, rPos, aBytes, 4);
		    	else
			    {
				    pTarget[rPos] = aBytes[0];
    				rPos ++;
	    			pTarget[rPos] = aBytes[1];
		    		rPos ++;
			    	pTarget[rPos] = aBytes[2];
				    rPos ++;
    				pTarget[rPos] = aBytes[3];
	    			rPos ++;
		    	}
            }
            else
            {
                OSL_ENSURE( false, "illegal Unicode character" );
                bRet = sal_False;
            }

            // reset surrogate
            nSurrogate = 0;
        }
		else if( c > 0x07FF )
		{
			sal_Int8 aBytes[] = { sal_Int8(0xE0 | ((c >> 12) & 0x0F)),
								  sal_Int8(0x80 | ((c >>  6) & 0x3F)),
								  sal_Int8(0x80 | ((c >>  0) & 0x3F)) };
			if ((rPos + 3) > SEQUENCESIZE)
				AddBytes(pTarget, rPos, aBytes, 3);
			else
			{
				pTarget[rPos] = aBytes[0];
				rPos ++;
				pTarget[rPos] = aBytes[1];
				rPos ++;
				pTarget[rPos] = aBytes[2];
				rPos ++;
			}
	    }
		else
		{
			sal_Int8 aBytes[] = { sal_Int8(0xC0 | ((c >>  6) & 0x1F)),
								sal_Int8(0x80 | ((c >>  0) & 0x3F)) };
			if ((rPos + 2) > SEQUENCESIZE)
				AddBytes(pTarget, rPos, aBytes, 2);
			else
			{
				pTarget[rPos] = aBytes[0];
				rPos ++;
				pTarget[rPos] = aBytes[1];
				rPos ++;
			}
		}
		OSL_ENSURE(rPos <= SEQUENCESIZE, "not reset current position");
		if (rPos == SEQUENCESIZE)
			rPos = writeSequence();

        // reset left-over surrogate
        if( ( nSurrogate != 0 ) && !( c >= 0xd800 && c < 0xdc00 ) )
        {
            OSL_ENSURE( nSurrogate != 0, "left-over Unicode surrogate" );
            nSurrogate = 0;
            bRet = sal_False;
        }
    }
	return bRet;
}

inline void SaxWriterHelper::FinishStartElement() throw( SAXException )
{
	if (!m_bStartElementFinished)
	{
		mp_Sequence[nCurrentPos] = '>';
		nCurrentPos++;
		if (nCurrentPos == SEQUENCESIZE)
			nCurrentPos = writeSequence();
		m_bStartElementFinished = sal_True;
	}
}

inline void SaxWriterHelper::insertIndentation(sal_uInt32 m_nLevel) throw( SAXException )
{
	FinishStartElement();
	if (m_nLevel > 0)
	{
		if ((nCurrentPos + m_nLevel + 1) <= SEQUENCESIZE)
		{
			mp_Sequence[nCurrentPos] = LINEFEED;
			nLastLineFeedPos = nCurrentPos;
			nCurrentPos++;
			memset( &(mp_Sequence[nCurrentPos]) , 32 , m_nLevel );
			nCurrentPos += m_nLevel;
			if (nCurrentPos == SEQUENCESIZE)
				nCurrentPos = writeSequence();
		}
		else
		{
			sal_uInt32 nCount(m_nLevel + 1);
			sal_Int8* pBytes = new sal_Int8[nCount];
			pBytes[0] = LINEFEED;
			memset( &(pBytes[1]), 32, m_nLevel );
			AddBytes(mp_Sequence, nCurrentPos, pBytes, nCount);
			delete[] pBytes;
			nLastLineFeedPos = nCurrentPos - nCount;
			if (nCurrentPos == SEQUENCESIZE)
				nCurrentPos = writeSequence();
		}
	}
	else
	{
		mp_Sequence[nCurrentPos] = LINEFEED;
		nLastLineFeedPos = nCurrentPos;
		nCurrentPos++;
		if (nCurrentPos == SEQUENCESIZE)
			nCurrentPos = writeSequence();
	}
}

inline sal_Bool SaxWriterHelper::writeString( const rtl::OUString& rWriteOutString,
						sal_Bool bDoNormalization,
						sal_Bool bNormalizeWhitespace ) throw( SAXException )
{
	FinishStartElement();
	return convertToXML(rWriteOutString.getStr(),
					rWriteOutString.getLength(),
					bDoNormalization,
					bNormalizeWhitespace,
					mp_Sequence,
					nCurrentPos);
}

inline void SaxWriterHelper::startDocument() throw( SAXException )
{
	const char pc[] = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
	const int nLen = strlen( pc );
	if ((nCurrentPos + nLen) <= SEQUENCESIZE)
	{
		memcpy( mp_Sequence, pc , nLen );
		nCurrentPos += nLen;
	}
	else
	{
		AddBytes(mp_Sequence, nCurrentPos, (sal_Int8*)pc, nLen);
	}
	OSL_ENSURE(nCurrentPos <= SEQUENCESIZE, "not reset current position");
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();
	mp_Sequence[nCurrentPos] = LINEFEED;
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();
}

inline SaxInvalidCharacterError SaxWriterHelper::startElement(const rtl::OUString& rName, const Reference< XAttributeList >& xAttribs) throw( SAXException )
{
	FinishStartElement();
	mp_Sequence[nCurrentPos] = '<';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();

	SaxInvalidCharacterError eRet(SAX_NONE);
	if (!writeString(rName, sal_False, sal_False))
		eRet = SAX_ERROR;

	sal_Int16 nAttribCount = xAttribs.is() ? static_cast<sal_Int16>(xAttribs->getLength()) : 0;
	for(sal_Int16 i = 0 ; i < nAttribCount ; i++ )
	{
		mp_Sequence[nCurrentPos] = ' ';
		nCurrentPos++;
		if (nCurrentPos == SEQUENCESIZE)
			nCurrentPos = writeSequence();

		if (!writeString(xAttribs->getNameByIndex( i ), sal_False, sal_False))
			eRet = SAX_ERROR;

		mp_Sequence[nCurrentPos] = '=';
		nCurrentPos++;
		if (nCurrentPos == SEQUENCESIZE)
			nCurrentPos = writeSequence();
		mp_Sequence[nCurrentPos] = '"';
		nCurrentPos++;
		if (nCurrentPos == SEQUENCESIZE)
			nCurrentPos = writeSequence();

		if (!writeString(xAttribs->getValueByIndex( i ), sal_True, sal_True) &&
			!(eRet == SAX_ERROR))
			eRet = SAX_WARNING;

		mp_Sequence[nCurrentPos] = '"';
		nCurrentPos++;
		if (nCurrentPos == SEQUENCESIZE)
			nCurrentPos = writeSequence();
	}

	m_bStartElementFinished = sal_False;	// because the '>' character is not added,
											// because it is possible, that the "/>"
											// characters have to add
	return eRet;
}

inline sal_Bool SaxWriterHelper::FinishEmptyElement() throw( SAXException )
{
	if (m_bStartElementFinished)
		return sal_False;

	mp_Sequence[nCurrentPos] = '/';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();
	mp_Sequence[nCurrentPos] = '>';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();

	m_bStartElementFinished = sal_True;

	return sal_True;
}

inline sal_Bool SaxWriterHelper::endElement(const rtl::OUString& rName) throw( SAXException )
{
	FinishStartElement();
	mp_Sequence[nCurrentPos] = '<';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();
	mp_Sequence[nCurrentPos] = '/';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();

	sal_Bool bRet(writeString( rName, sal_False, sal_False));

	mp_Sequence[nCurrentPos] = '>';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();

	return bRet;
}

inline void SaxWriterHelper::endDocument() throw( SAXException )
{
	if (nCurrentPos > 0)
	{
		m_Sequence.realloc(nCurrentPos);
		nCurrentPos = writeSequence();
		//m_Sequence.realloc(SEQUENCESIZE);
	}
}

inline void SaxWriterHelper::clearBuffer() throw( SAXException )
{
    FinishStartElement();
    if (nCurrentPos > 0)
    {
        m_Sequence.realloc(nCurrentPos);
        nCurrentPos = writeSequence();
        m_Sequence.realloc(SEQUENCESIZE);
        // Be sure to update the array pointer after the reallocation.
        mp_Sequence = m_Sequence.getArray();
    }
}

inline sal_Bool SaxWriterHelper::processingInstruction(const rtl::OUString& rTarget, const rtl::OUString& rData) throw( SAXException )
{
	FinishStartElement();
	mp_Sequence[nCurrentPos] = '<';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();
	mp_Sequence[nCurrentPos] = '?';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();

	sal_Bool bRet(writeString( rTarget, sal_False, sal_False ));

	mp_Sequence[nCurrentPos] = ' ';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();

	if (!writeString( rData, sal_False, sal_False ))
		bRet = sal_False;

	mp_Sequence[nCurrentPos] = '?';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();
	mp_Sequence[nCurrentPos] = '>';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();

	return bRet;
}

inline void SaxWriterHelper::startCDATA() throw( SAXException )
{
	FinishStartElement();
	if ((nCurrentPos + 9) <= SEQUENCESIZE)
	{
		memcpy( &(mp_Sequence[nCurrentPos]), "<![CDATA[" , 9 );
		nCurrentPos += 9;
	}
	else
		AddBytes(mp_Sequence, nCurrentPos, (sal_Int8*)"<![CDATA[" , 9);
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();
}

inline void SaxWriterHelper::endCDATA() throw( SAXException )
{
	FinishStartElement();
	if ((nCurrentPos + 3) <= SEQUENCESIZE)
	{
		memcpy( &(mp_Sequence[nCurrentPos]), "]]>" , 3 );
		nCurrentPos += 3;
	}
	else
		AddBytes(mp_Sequence, nCurrentPos, (sal_Int8*)"]]>" , 3);
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();
}

inline sal_Bool SaxWriterHelper::comment(const rtl::OUString& rComment) throw( SAXException )
{
	FinishStartElement();
	mp_Sequence[nCurrentPos] = '<';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();
	mp_Sequence[nCurrentPos] = '!';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();
	mp_Sequence[nCurrentPos] = '-';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();
	mp_Sequence[nCurrentPos] = '-';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();

	sal_Bool bRet(writeString( rComment, sal_False, sal_False));

	mp_Sequence[nCurrentPos] = '-';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();
	mp_Sequence[nCurrentPos] = '-';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();
	mp_Sequence[nCurrentPos] = '>';
	nCurrentPos++;
	if (nCurrentPos == SEQUENCESIZE)
		nCurrentPos = writeSequence();

	return bRet;
}

inline sal_Int32 calcXMLByteLength( const sal_Unicode *pStr, sal_Int32 nStrLen,
									sal_Bool bDoNormalization,
									sal_Bool bNormalizeWhitespace )
{
	sal_Int32 nOutputLength = 0;
    sal_uInt32 nSurrogate = 0;

	for( sal_Int32 i = 0 ; i < nStrLen ; i++ )
	{
	    sal_uInt16 c = pStr[i];
	    if( !IsInvalidChar(c) && (c >= 0x0001) && (c <= 0x007F) )
		{
			if( bDoNormalization )
			{
				switch( c )
				{
				case '&':       // resemble to &amp;
					nOutputLength +=5;
					break;
				case '<':       // &lt;
				case '>':       // &gt;
					nOutputLength +=4;
					break;
				case 39:        // 39 == ''', &apos;
				case '"':       // &quot;
				case 13:        // &#x0d;
					nOutputLength += 6;
					break;

				case 10:        // &#x0a;
				case 9:         // &#x09;
					if( bNormalizeWhitespace )
					{
						nOutputLength += 6;		  //
					}
					else
					{
						nOutputLength ++;
					}
					break;
				default:
					nOutputLength ++;
				}
			}
			else
			{
				nOutputLength ++;
			}
	    }
        else if( c >= 0xd800 && c < 0xdc00  )
        {
            // save surrogate
            nSurrogate = ( ( c & 0x03ff ) + 0x0040 );
        }
        else if( c >= 0xdc00 && c < 0xe000 )
        {
            // 2. surrogate: write as UTF-8 (if range is OK
            nSurrogate = ( nSurrogate << 10 ) | ( c & 0x03ff );
            if( nSurrogate >= 0x00010000  &&  nSurrogate <= 0x0010FFFF )
                nOutputLength += 4;
            nSurrogate = 0;
        }
		else if( c > 0x07FF )
		{
			nOutputLength += 3;
	    }
		else
		{
			nOutputLength += 2;
	    }

        // surrogate processing
        if( ( nSurrogate != 0 ) && !( c >= 0xd800 && c < 0xdc00 ) )
            nSurrogate = 0;
    }

	return nOutputLength;
}

/** returns position of first ascii 10 within the string, -1 when no 10 in string.
 */
static inline sal_Int32 getFirstLineBreak( const OUString & str ) throw ()
{
	const sal_Unicode *pSource = str.getStr();
	sal_Int32 nLen  = str.getLength();

	for( int n = 0; n < nLen ; n ++ )
	{
		if( LINEFEED == pSource[n] ) {
			return n;
		}
	}
	return -1;
}

/** returns position of last ascii 10 within sequence, -1 when no 10 in string.
 */
static inline sal_Int32 getLastLineBreak( const Sequence<sal_Int8>  & seq) throw ()
{
	const sal_Int8 *pSource = seq.getConstArray();
	sal_Int32 nLen  = seq.getLength();

	for( int n = nLen-1; n >= 0 ; n -- )
	{
		if( LINEFEED == pSource[n] ) {
			return n;
		}
	}
	return -1;
}


class SAXWriter :
	public WeakImplHelper3<
            XActiveDataSource,
            XExtendedDocumentHandler,
  	        XServiceInfo >
{
public:
	SAXWriter( ) :
		m_seqStartElement(),
		mp_SaxWriterHelper( NULL ),
		m_bForceLineBreak(sal_False),
		m_bAllowLineBreak(sal_False)
		{}
	~SAXWriter()
	{
		delete mp_SaxWriterHelper;
	}

public: // XActiveDataSource
    virtual void SAL_CALL setOutputStream(const Reference< XOutputStream > & aStream)
		throw (RuntimeException)
    		{
                // temporary: set same stream again to clear buffer
                if ( m_out == aStream && mp_SaxWriterHelper && m_bDocStarted )
                    mp_SaxWriterHelper->clearBuffer();
                else
                {

				m_out = aStream;
				delete mp_SaxWriterHelper;
				mp_SaxWriterHelper = new SaxWriterHelper(m_out);
				m_bDocStarted = sal_False;
				m_nLevel = 0;
				m_bIsCDATA = sal_False;

                }
			}
    virtual Reference< XOutputStream >  SAL_CALL getOutputStream(void)
		throw(RuntimeException)
    		{ return m_out; }

public: // XDocumentHandler
    virtual void SAL_CALL startDocument(void)
		throw(SAXException, RuntimeException);

    virtual void SAL_CALL endDocument(void)
		throw(SAXException, RuntimeException);

    virtual void SAL_CALL startElement(const OUString& aName,
									   const Reference< XAttributeList > & xAttribs)
		throw (SAXException, RuntimeException);

    virtual void SAL_CALL endElement(const OUString& aName)
		throw(SAXException, RuntimeException);

    virtual void SAL_CALL characters(const OUString& aChars)
		throw(SAXException, RuntimeException);

    virtual void SAL_CALL ignorableWhitespace(const OUString& aWhitespaces)
		throw(SAXException, RuntimeException);
    virtual void SAL_CALL processingInstruction(const OUString& aTarget,
												const OUString& aData)
		throw(SAXException, RuntimeException);
    virtual void SAL_CALL setDocumentLocator(const Reference< XLocator > & xLocator)
		throw(SAXException, RuntimeException);

public: // XExtendedDocumentHandler
    virtual void SAL_CALL startCDATA(void) throw(SAXException, RuntimeException);
    virtual void SAL_CALL endCDATA(void) throw(RuntimeException);
    virtual void SAL_CALL comment(const OUString& sComment)
		throw(SAXException, RuntimeException);
    virtual void SAL_CALL unknown(const OUString& sString)
		throw(SAXException, RuntimeException);
	virtual void SAL_CALL allowLineBreak(void)
		throw(SAXException,RuntimeException);

public: // XServiceInfo
    OUString                     SAL_CALL getImplementationName() throw();
    Sequence< OUString >         SAL_CALL getSupportedServiceNames(void) throw();
    sal_Bool                    SAL_CALL supportsService(const OUString& ServiceName) throw();

private:

	void writeSequence( const Sequence<sal_Int8> & seq );
	sal_Int32 getIndentPrefixLength( sal_Int32 nFirstLineBreakOccurence ) throw();

	Reference< XOutputStream > 	m_out;
	Sequence < sal_Int8 > 		m_seqStartElement;
	SaxWriterHelper*			mp_SaxWriterHelper;

	// Status information
	sal_Bool m_bDocStarted : 1;
	sal_Bool m_bIsCDATA : 1;
	sal_Bool m_bForceLineBreak : 1;
	sal_Bool m_bAllowLineBreak : 1;
	sal_Int32 m_nLevel;
};


//--------------------------------------
// the extern interface
//---------------------------------------
Reference < XInterface > SAL_CALL SaxWriter_CreateInstance(
	const Reference < XMultiServiceFactory >  &  )
	throw (Exception)
{
	SAXWriter *p = new SAXWriter;
	return Reference< XInterface > ( SAL_STATIC_CAST(OWeakObject *, p ) );
}

OUString SaxWriter_getServiceName() throw()
{
	return OUString::createFromAscii( "com.sun.star.xml.sax.Writer" );
}

OUString SaxWriter_getImplementationName() throw()
{
	return OUString::createFromAscii( "com.sun.star.extensions.xml.sax.Writer" );
}

Sequence< OUString > 	SaxWriter_getSupportedServiceNames(void) throw()
{
	Sequence<OUString> aRet(1);
	aRet.getArray()[0] = SaxWriter_getServiceName();
	return aRet;
}


sal_Int32 SAXWriter::getIndentPrefixLength( sal_Int32 nFirstLineBreakOccurence ) throw()
{
	sal_Int32 nLength =-1;
	if (mp_SaxWriterHelper)
	{
		if ( m_bForceLineBreak ||
			(m_bAllowLineBreak &&
			((nFirstLineBreakOccurence + mp_SaxWriterHelper->GetLastColumnCount()) > MAXCOLUMNCOUNT)) )
			nLength = m_nLevel;
	}
	m_bForceLineBreak = sal_False;
	m_bAllowLineBreak = sal_False;
	return nLength;
}

static inline sal_Bool isFirstCharWhitespace( const sal_Unicode *p ) throw()
{
	return *p == ' ';
}


// XServiceInfo
OUString SAXWriter::getImplementationName() throw()
{
    return SaxWriter_getImplementationName();
}

// XServiceInfo
sal_Bool SAXWriter::supportsService(const OUString& ServiceName) throw()
{
    Sequence< OUString > aSNL = getSupportedServiceNames();
    const OUString * pArray = aSNL.getConstArray();

    for( sal_Int32 i = 0; i < aSNL.getLength(); i++ )
        if( pArray[i] == ServiceName )
            return sal_True;

    return sal_False;
}

// XServiceInfo
Sequence< OUString > SAXWriter::getSupportedServiceNames(void) throw ()
{
    Sequence<OUString> seq(1);
    seq.getArray()[0] = SaxWriter_getServiceName();
    return seq;
}



void SAXWriter::startDocument()						throw(SAXException, RuntimeException )
{
	if( m_bDocStarted || ! m_out.is() || !mp_SaxWriterHelper ) {
		throw SAXException();
	}
	m_bDocStarted = sal_True;
	mp_SaxWriterHelper->startDocument();
}


void SAXWriter::endDocument(void) 					throw(SAXException, RuntimeException)
{
	if( ! m_bDocStarted )
	{
		throw SAXException(
			OUString::createFromAscii( "endDocument called before startDocument" ),
			Reference< XInterface >() , Any() );
	}
	if( m_nLevel ) {
		throw SAXException(
			OUString::createFromAscii( "unexpected end of document" ),
			Reference< XInterface >() , Any() );
	}
	mp_SaxWriterHelper->endDocument();
	try
	{
		m_out->closeOutput();
	}
	catch( IOException & e )
	{
		Any a;
		a <<= e;
		throw SAXException(
			OUString::createFromAscii( "IO exception during closing the IO Stream" ),
			Reference< XInterface > (),
			a );
	}
}


void SAXWriter::startElement(const OUString& aName, const Reference< XAttributeList >& xAttribs)
	throw(SAXException, RuntimeException)
{
	if( ! m_bDocStarted )
	{
		SAXException except;
		except.Message = OUString( RTL_CONSTASCII_USTRINGPARAM( "startElement called before startDocument" ));
		throw except;
	}
	if( m_bIsCDATA )
	{
		SAXException except;
		except.Message = OUString( RTL_CONSTASCII_USTRINGPARAM( "startElement call not allowed with CDATA sections" ));
		throw except;
	}

	sal_Int32 nLength(0);
	if (m_bAllowLineBreak)
	{
		sal_Int32 nAttribCount = xAttribs.is() ? xAttribs->getLength() : 0;

		nLength ++; // "<"
		nLength += calcXMLByteLength( aName.getStr() , aName.getLength(),
								  sal_False, sal_False ); // the tag name

		sal_Int16 n;
		for( n = 0 ; n < static_cast<sal_Int16>(nAttribCount) ; n ++ ) {
			nLength ++; // " "
			OUString tmp =  xAttribs->getNameByIndex( n );

			nLength += calcXMLByteLength( tmp.getStr() , tmp.getLength() , sal_False, sal_False );

			nLength += 2; // ="

			tmp = xAttribs->getValueByIndex( n );

			nLength += calcXMLByteLength( tmp.getStr(), tmp.getLength(), sal_True, sal_True );

			nLength += 1; // "
		}

		nLength ++;  // '>'
	}

	// Is there a new indentation necesarry ?
	sal_Int32 nPrefix(getIndentPrefixLength( nLength ));

	// write into sequence
	if( nPrefix >= 0 )
		mp_SaxWriterHelper->insertIndentation( nPrefix );

	SaxInvalidCharacterError eRet(mp_SaxWriterHelper->startElement(aName, xAttribs));

	m_nLevel++;

	if (eRet == SAX_WARNING)
	{
		SAXInvalidCharacterException except;
		except.Message = OUString( RTL_CONSTASCII_USTRINGPARAM( "Invalid charcter during XML-Export in a attribute value" ) );
		throw except;
	}
	else if (eRet == SAX_ERROR)
	{
		SAXException except;
		except.Message = OUString( RTL_CONSTASCII_USTRINGPARAM( "Invalid charcter during XML-Export" ) );
		throw except;
	}
}

void SAXWriter::endElement(const OUString& aName) 	throw (SAXException, RuntimeException)
{
	if( ! m_bDocStarted ) {
		throw SAXException ();
	}
	m_nLevel --;

	if( m_nLevel < 0 ) {
		throw SAXException();
	}
	sal_Bool bRet(sal_True);

	if( mp_SaxWriterHelper->FinishEmptyElement() )
        m_bForceLineBreak = sal_False;
	else
	{
		// only ascii chars allowed
		sal_Int32 nLength(0);
		if (m_bAllowLineBreak)
			nLength = 3 + calcXMLByteLength( aName.getStr(), aName.getLength(), sal_False, sal_False );
		sal_Int32 nPrefix = getIndentPrefixLength( nLength );

		if( nPrefix >= 0 )
			mp_SaxWriterHelper->insertIndentation( nPrefix );

		bRet = mp_SaxWriterHelper->endElement(aName);
	}

	if (!bRet)
	{
		SAXException except;
		except.Message = OUString( RTL_CONSTASCII_USTRINGPARAM( "Invalid charcter during XML-Export" ) );
		throw except;
	}
}

void SAXWriter::characters(const OUString& aChars) 	throw(SAXException, RuntimeException)
{
	if( ! m_bDocStarted )
	{
		SAXException except;
		except.Message = OUString( RTL_CONSTASCII_USTRINGPARAM( "characters method called before startDocument" ) );
		throw except;
	}

	sal_Bool bThrowException(sal_False);
	if( aChars.getLength() )
	{
		if( m_bIsCDATA )
			bThrowException = !mp_SaxWriterHelper->writeString( aChars, sal_False, sal_False );
		else
		{
			// Note : nFirstLineBreakOccurence is not exact, because we don't know, how
			//        many 2 and 3 byte chars are inbetween. However this whole stuff
			//        is eitherway for pretty printing only, so it does not need to be exact.
			sal_Int32 nLength(0);
			sal_Int32 nIndentPrefix(-1);
			if (m_bAllowLineBreak)
			{
				sal_Int32 nFirstLineBreakOccurence = getFirstLineBreak( aChars );

				nLength = calcXMLByteLength( aChars.getStr(), aChars.getLength(),
											   ! m_bIsCDATA , sal_False );
				nIndentPrefix = getIndentPrefixLength(
					nFirstLineBreakOccurence >= 0 ? nFirstLineBreakOccurence : nLength );
			}
			else
				nIndentPrefix = getIndentPrefixLength(nLength);

			// insert indentation
			if( nIndentPrefix >= 0 )
			{
				if( isFirstCharWhitespace( aChars.getStr() ) )
					mp_SaxWriterHelper->insertIndentation( nIndentPrefix - 1 );
				else
					mp_SaxWriterHelper->insertIndentation( nIndentPrefix );
			}
			bThrowException = !mp_SaxWriterHelper->writeString(aChars, sal_True , sal_False);
		}
	}
	if (bThrowException)
	{
		SAXInvalidCharacterException except;
		except.Message = OUString( RTL_CONSTASCII_USTRINGPARAM( "Invalid charcter during XML-Export" ) );
		throw except;
	}
}


void SAXWriter::ignorableWhitespace(const OUString&) throw(SAXException, RuntimeException)
{
	if( ! m_bDocStarted )
	{
		throw SAXException ();
	}

	m_bForceLineBreak = sal_True;
}

void SAXWriter::processingInstruction(const OUString& aTarget, const OUString& aData)
	throw (SAXException, RuntimeException)
{
	if( ! m_bDocStarted || m_bIsCDATA )
	{
		throw SAXException();
	}

	sal_Int32 nLength(0);
	if (m_bAllowLineBreak)
	{
		nLength = 2;  // "<?"
		nLength += calcXMLByteLength( aTarget.getStr(), aTarget.getLength(), sal_False, sal_False );

		nLength += 1;  // " "

		nLength += calcXMLByteLength( aData.getStr(), aData.getLength(), sal_False, sal_False );

		nLength += 2; // "?>"
	}

	sal_Int32 nPrefix = getIndentPrefixLength( nLength );

	if( nPrefix >= 0 )
		mp_SaxWriterHelper->insertIndentation( nPrefix );

	if (!mp_SaxWriterHelper->processingInstruction(aTarget, aData))
	{
		SAXException except;
		except.Message = OUString( RTL_CONSTASCII_USTRINGPARAM( "Invalid charcter during XML-Export" ) );
		throw except;
	}
}


void SAXWriter::setDocumentLocator(const Reference< XLocator >&)
		throw (SAXException, RuntimeException)
{

}

void SAXWriter::startCDATA(void) throw(SAXException, RuntimeException)
{
	if( ! m_bDocStarted || m_bIsCDATA)
	{
		throw SAXException ();
	}

	sal_Int32 nLength = 9;
	sal_Int32 nPrefix = getIndentPrefixLength( nLength );
	if( nPrefix >= 0 )
		mp_SaxWriterHelper->insertIndentation( nPrefix );

	mp_SaxWriterHelper->startCDATA();

	m_bIsCDATA = sal_True;
}

void SAXWriter::endCDATA(void) throw (RuntimeException)
{
	if( ! m_bDocStarted | ! m_bIsCDATA)
	{
		SAXException except;
		except.Message = OUString( RTL_CONSTASCII_USTRINGPARAM( "endCDATA was called without startCDATA" ) );
		throw except;
	}

	sal_Int32 nLength = 3;
	sal_Int32 nPrefix = getIndentPrefixLength( nLength );
	if( nPrefix >= 0 )
		mp_SaxWriterHelper->insertIndentation( nPrefix );

	mp_SaxWriterHelper->endCDATA();

	m_bIsCDATA = sal_False;
}


void SAXWriter::comment(const OUString& sComment) throw(SAXException, RuntimeException)
{
	if( ! m_bDocStarted || m_bIsCDATA )
	{
		throw SAXException();
	}

	sal_Int32 nLength(0);
	if (m_bAllowLineBreak)
	{
		nLength = 4; // "<!--"
		nLength += calcXMLByteLength( sComment.getStr(), sComment.getLength(), sal_False, sal_False);

		nLength += 3;
	}

	sal_Int32 nPrefix = getIndentPrefixLength( nLength );
	if( nPrefix >= 0 )
		mp_SaxWriterHelper->insertIndentation( nPrefix );

	if (!mp_SaxWriterHelper->comment(sComment))
	{
		SAXException except;
		except.Message = OUString( RTL_CONSTASCII_USTRINGPARAM( "Invalid charcter during XML-Export" ) );
		throw except;
	}
}


void SAXWriter::allowLineBreak( ) 	throw ( SAXException , RuntimeException)
{
	if( ! m_bDocStarted || m_bAllowLineBreak ) {
		throw SAXException();
	}

	 m_bAllowLineBreak = sal_True;
}

void SAXWriter::unknown(const OUString& sString) throw (SAXException, RuntimeException)
{

	if( ! m_bDocStarted )
	{
		throw SAXException ();
	}
	if( m_bIsCDATA )
	{
		throw SAXException();
	}

	if( sString.matchAsciiL( "<?xml", 5 ) )
		return;

	sal_Int32 nLength(0);
	if (m_bAllowLineBreak)
		nLength = calcXMLByteLength( sString.getStr(), sString.getLength(), sal_False, sal_False );

	sal_Int32 nPrefix = getIndentPrefixLength( nLength );
	if( nPrefix >= 0 )
		mp_SaxWriterHelper->insertIndentation( nPrefix );

	if (!mp_SaxWriterHelper->writeString( sString, sal_False, sal_False))
	{
		SAXException except;
		except.Message = OUString( RTL_CONSTASCII_USTRINGPARAM( "Invalid charcter during XML-Export" ) );
		throw except;
	}
}

}