Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2535 insertions, 0 deletions

diff --git a/sax/source/tools/converter.cxx b/sax/source/tools/converter.cxx
new file mode 100644
index 000000000..2abfe3575
--- /dev/null
+++ b/sax/source/tools/converter.cxx
@@ -0,0 +1,2535 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sax/tools/converter.hxx>
+
+#include <com/sun/star/i18n/UnicodeType.hpp>
+#include <com/sun/star/util/DateTime.hpp>
+#include <com/sun/star/util/Date.hpp>
+#include <com/sun/star/util/Duration.hpp>
+#include <com/sun/star/util/Time.hpp>
+#include <optional>
+
+#include <rtl/ustrbuf.hxx>
+#include <rtl/math.hxx>
+#include <rtl/character.hxx>
+#include <sal/log.hxx>
+#include <o3tl/typed_flags_set.hxx>
+#include <o3tl/unit_conversion.hxx>
+#include <osl/diagnose.h>
+#include <tools/long.hxx>
+
+#include <algorithm>
+#include <string_view>
+
+using namespace com::sun::star;
+using namespace com::sun::star::uno;
+using namespace com::sun::star::util;
+using namespace ::com::sun::star::i18n;
+
+
+namespace sax {
+
+const std::string_view gpsMM = "mm";
+const std::string_view gpsCM = "cm";
+const std::string_view gpsPT = "pt";
+const std::string_view gpsINCH = "in";
+const std::string_view gpsPC = "pc";
+
+const sal_Int8 XML_MAXDIGITSCOUNT_TIME = 14;
+
+static sal_Int64 toInt64_WithLength(const sal_Unicode * str, sal_Int16 radix, sal_Int32 nStrLength )
+{
+    return rtl_ustr_toInt64_WithLength(str, radix, nStrLength);
+}
+static sal_Int64 toInt64_WithLength(const char * str, sal_Int16 radix, sal_Int32 nStrLength )
+{
+    return rtl_str_toInt64_WithLength(str, radix, nStrLength);
+}
+
+namespace
+{
+o3tl::Length Measure2O3tlUnit(sal_Int16 nUnit)
+{
+    switch (nUnit)
+    {
+        case MeasureUnit::TWIP:
+            return o3tl::Length::twip;
+        case MeasureUnit::POINT:
+            return o3tl::Length::pt;
+        case MeasureUnit::MM_10TH:
+            return o3tl::Length::mm10;
+        case MeasureUnit::MM_100TH:
+            return o3tl::Length::mm100;
+        case MeasureUnit::MM:
+            return o3tl::Length::mm;
+        case MeasureUnit::CM:
+            return o3tl::Length::cm;
+        default:
+            SAL_WARN("sax", "unit not supported for length");
+            [[fallthrough]];
+        case MeasureUnit::INCH:
+            return o3tl::Length::in;
+    }
+}
+
+std::string_view Measure2UnitString(sal_Int16 nUnit)
+{
+    switch (nUnit)
+    {
+        case MeasureUnit::TWIP:
+            return gpsPC; // ??
+        case MeasureUnit::POINT:
+            return gpsPT;
+        case MeasureUnit::MM_10TH:
+        case MeasureUnit::MM_100TH:
+            return {};
+        case MeasureUnit::MM:
+            return gpsMM;
+        case MeasureUnit::CM:
+            return gpsCM;
+        case MeasureUnit::INCH:
+        default:
+            return gpsINCH;
+    }
+}
+
+template <typename V> bool wordEndsWith(V string, std::string_view expected)
+{
+    V substr = string.substr(0, expected.size());
+    return std::equal(substr.begin(), substr.end(), expected.begin(), expected.end(),
+                      [](sal_uInt32 c1, sal_uInt32 c2) { return rtl::toAsciiLowerCase(c1) == c2; })
+           && (string.size() == expected.size() || string[expected.size()] == ' ');
+}
+
+}
+
+/** convert string to measure using optional min and max values*/
+template<typename V>
+static bool lcl_convertMeasure( sal_Int32& rValue,
+                                V rString,
+                                sal_Int16 nTargetUnit /* = MeasureUnit::MM_100TH */,
+                                sal_Int32 nMin /* = SAL_MIN_INT32 */,
+                                sal_Int32 nMax /* = SAL_MAX_INT32 */ )
+{
+    bool bNeg = false;
+    double nVal = 0;
+
+    sal_Int32 nPos = 0;
+    sal_Int32 const nLen = rString.size();
+
+    // skip white space
+    while( (nPos < nLen) && (rString[nPos] <= ' ') )
+        nPos++;
+
+    if( nPos < nLen && '-' == rString[nPos] )
+    {
+        bNeg = true;
+        nPos++;
+    }
+
+    // get number
+    while( nPos < nLen &&
+           '0' <= rString[nPos] &&
+           '9' >= rString[nPos] )
+    {
+        // TODO: check overflow!
+        nVal *= 10;
+        nVal += (rString[nPos] - '0');
+        nPos++;
+    }
+    if( nPos < nLen && '.' == rString[nPos] )
+    {
+        nPos++;
+        double nDiv = 1.;
+
+        while( nPos < nLen &&
+               '0' <= rString[nPos] &&
+               '9' >= rString[nPos] )
+        {
+            // TODO: check overflow!
+            nDiv *= 10;
+            nVal += ( static_cast<double>(rString[nPos] - '0') / nDiv );
+            nPos++;
+        }
+    }
+
+    // skip white space
+    while( (nPos < nLen) && (rString[nPos] <= ' ') )
+        nPos++;
+
+    if( nPos < nLen )
+    {
+
+        if( MeasureUnit::PERCENT == nTargetUnit )
+        {
+            if( '%' != rString[nPos] )
+                return false;
+        }
+        else if( MeasureUnit::PIXEL == nTargetUnit )
+        {
+            if( nPos + 1 >= nLen ||
+                ('p' != rString[nPos] &&
+                 'P' != rString[nPos])||
+                ('x' != rString[nPos+1] &&
+                 'X' != rString[nPos+1]) )
+                return false;
+        }
+        else
+        {
+            OSL_ENSURE( MeasureUnit::TWIP == nTargetUnit || MeasureUnit::POINT == nTargetUnit ||
+                        MeasureUnit::MM_100TH == nTargetUnit || MeasureUnit::MM_10TH == nTargetUnit ||
+                        MeasureUnit::PIXEL == nTargetUnit, "unit is not supported");
+
+            o3tl::Length eFrom = o3tl::Length::invalid;
+
+            if( MeasureUnit::TWIP == nTargetUnit )
+            {
+                switch (rtl::toAsciiLowerCase<sal_uInt32>(rString[nPos]))
+                {
+                case u'c':
+                    if (wordEndsWith(rString.substr(nPos + 1), "m"))
+                        eFrom = o3tl::Length::cm;
+                    break;
+                case u'i':
+                    if (wordEndsWith(rString.substr(nPos + 1), "n"))
+                        eFrom = o3tl::Length::in;
+                    break;
+                case u'm':
+                    if (wordEndsWith(rString.substr(nPos + 1), "m"))
+                        eFrom = o3tl::Length::mm;
+                    break;
+                case u'p':
+                    if (wordEndsWith(rString.substr(nPos + 1), "t"))
+                        eFrom = o3tl::Length::pt;
+                    else if (wordEndsWith(rString.substr(nPos + 1), "c"))
+                        eFrom = o3tl::Length::pc;
+                    break;
+                }
+            }
+            else if( MeasureUnit::MM_100TH == nTargetUnit || MeasureUnit::MM_10TH == nTargetUnit )
+            {
+                switch (rtl::toAsciiLowerCase<sal_uInt32>(rString[nPos]))
+                {
+                case u'c':
+                    if (wordEndsWith(rString.substr(nPos + 1), "m"))
+                        eFrom = o3tl::Length::cm;
+                    break;
+                case u'i':
+                    if (wordEndsWith(rString.substr(nPos + 1), "n"))
+                        eFrom = o3tl::Length::in;
+                    break;
+                case u'm':
+                    if (wordEndsWith(rString.substr(nPos + 1), "m"))
+                        eFrom = o3tl::Length::mm;
+                    break;
+                case u'p':
+                    if (wordEndsWith(rString.substr(nPos + 1), "t"))
+                        eFrom = o3tl::Length::pt;
+                    else if (wordEndsWith(rString.substr(nPos + 1), "c"))
+                        eFrom = o3tl::Length::pc;
+                    else if (wordEndsWith(rString.substr(nPos + 1), "x"))
+                        eFrom = o3tl::Length::px;
+                    break;
+                }
+            }
+            else if( MeasureUnit::POINT == nTargetUnit )
+            {
+                if (wordEndsWith(rString.substr(nPos), "pt"))
+                    eFrom = o3tl::Length::pt;
+            }
+
+            if (eFrom == o3tl::Length::invalid)
+                return false;
+
+            // TODO: check overflow
+            nVal = o3tl::convert(nVal, eFrom, Measure2O3tlUnit(nTargetUnit));
+        }
+    }
+
+    nVal += .5;
+    if( bNeg )
+        nVal = -nVal;
+
+    if( nVal <= static_cast<double>(nMin) )
+        rValue = nMin;
+    else if( nVal >= static_cast<double>(nMax) )
+        rValue = nMax;
+    else
+        rValue = static_cast<sal_Int32>(nVal);
+
+    return true;
+}
+
+/** convert string to measure using optional min and max values*/
+bool Converter::convertMeasure( sal_Int32& rValue,
+                                std::u16string_view rString,
+                                sal_Int16 nTargetUnit /* = MeasureUnit::MM_100TH */,
+                                sal_Int32 nMin /* = SAL_MIN_INT32 */,
+                                sal_Int32 nMax /* = SAL_MAX_INT32 */ )
+{
+    return lcl_convertMeasure(rValue, rString, nTargetUnit, nMin, nMax);
+}
+
+/** convert string to measure using optional min and max values*/
+bool Converter::convertMeasure( sal_Int32& rValue,
+                                std::string_view rString,
+                                sal_Int16 nTargetUnit /* = MeasureUnit::MM_100TH */,
+                                sal_Int32 nMin /* = SAL_MIN_INT32 */,
+                                sal_Int32 nMax /* = SAL_MAX_INT32 */ )
+{
+    return lcl_convertMeasure(rValue, rString, nTargetUnit, nMin, nMax);
+}
+
+
+/** convert measure in given unit to string with given unit */
+void Converter::convertMeasure( OUStringBuffer& rBuffer,
+                                sal_Int32 nMeasure,
+                                sal_Int16 nSourceUnit /* = MeasureUnit::MM_100TH */,
+                                sal_Int16 nTargetUnit /* = MeasureUnit::INCH */  )
+{
+    if( nSourceUnit == MeasureUnit::PERCENT )
+    {
+        OSL_ENSURE( nTargetUnit == MeasureUnit::PERCENT,
+                    "MeasureUnit::PERCENT only maps to MeasureUnit::PERCENT!" );
+
+        rBuffer.append( nMeasure );
+        rBuffer.append( '%' );
+
+        return;
+    }
+    sal_Int64 nValue(nMeasure); // extend to 64-bit first to avoid overflow
+    // the sign is processed separately
+    if (nValue < 0)
+    {
+        nValue = -nValue;
+        rBuffer.append( '-' );
+    }
+
+    o3tl::Length eFrom = o3tl::Length::in, eTo = o3tl::Length::in;
+    int nFac = 100; // used to get specific number of decimals (2 by default)
+    std::string_view psUnit;
+    switch( nSourceUnit )
+    {
+    case MeasureUnit::TWIP:
+        eFrom = o3tl::Length::twip;
+        switch( nTargetUnit )
+        {
+        case MeasureUnit::MM_100TH:
+        case MeasureUnit::MM_10TH:
+            OSL_ENSURE( MeasureUnit::INCH == nTargetUnit,"output unit not supported for twip values" );
+            [[fallthrough]];
+        case MeasureUnit::MM:
+            eTo = o3tl::Length::mm;
+            nFac = 100;
+            psUnit = gpsMM;
+            break;
+
+        case MeasureUnit::CM:
+            eTo = o3tl::Length::cm;
+            nFac = 1000;
+            psUnit = gpsCM;
+            break;
+
+        case MeasureUnit::POINT:
+            eTo = o3tl::Length::pt;
+            nFac = 100;
+            psUnit = gpsPT;
+            break;
+
+        case MeasureUnit::INCH:
+        default:
+            OSL_ENSURE( MeasureUnit::INCH == nTargetUnit,
+                        "output unit not supported for twip values" );
+            nFac = 10000;
+            psUnit = gpsINCH;
+            break;
+        }
+        break;
+
+    case MeasureUnit::POINT:
+        // 1pt = 1pt (exactly)
+        OSL_ENSURE( MeasureUnit::POINT == nTargetUnit,
+                    "output unit not supported for pt values" );
+        eFrom = eTo = o3tl::Length::pt;
+        nFac = 1;
+        psUnit = gpsPT;
+        break;
+    case MeasureUnit::MM_10TH:
+    case MeasureUnit::MM_100TH:
+        {
+            int nFac2 = (MeasureUnit::MM_100TH == nSourceUnit) ? 100 : 10;
+            eFrom = Measure2O3tlUnit(nSourceUnit);
+            switch( nTargetUnit )
+            {
+            case MeasureUnit::MM_100TH:
+            case MeasureUnit::MM_10TH:
+                OSL_ENSURE( MeasureUnit::INCH == nTargetUnit,
+                            "output unit not supported for 1/100mm values" );
+                [[fallthrough]];
+            case MeasureUnit::MM:
+                eTo = o3tl::Length::mm;
+                nFac = nFac2;
+                psUnit = gpsMM;
+                break;
+
+            case MeasureUnit::CM:
+                eTo = o3tl::Length::cm;
+                nFac = 10*nFac2;
+                psUnit = gpsCM;
+                break;
+
+            case MeasureUnit::POINT:
+                eTo = o3tl::Length::pt;
+                nFac = nFac2;
+                psUnit = gpsPT;
+                break;
+
+            case MeasureUnit::INCH:
+            default:
+                OSL_ENSURE( MeasureUnit::INCH == nTargetUnit,
+                            "output unit not supported for 1/100mm values" );
+                nFac = 100*nFac2;
+                psUnit = gpsINCH;
+                break;
+            }
+            break;
+        }
+    default:
+        OSL_ENSURE(false, "sax::Converter::convertMeasure(): "
+                "source unit not supported");
+        break;
+    }
+
+    nValue = o3tl::convert(nValue * nFac, eFrom, eTo);
+
+    rBuffer.append( static_cast<sal_Int64>(nValue / nFac) );
+    if (nFac > 1 && (nValue % nFac) != 0)
+    {
+        rBuffer.append( '.' );
+        while (nFac > 1 && (nValue % nFac) != 0)
+        {
+            nFac /= 10;
+            rBuffer.append( static_cast<sal_Int32>((nValue / nFac) % 10) );
+        }
+    }
+
+    if (psUnit.length() > 0)
+        rBuffer.appendAscii(psUnit.data(), psUnit.length());
+}
+
+/** convert string to boolean */
+bool Converter::convertBool( bool& rBool, std::u16string_view rString )
+{
+    rBool = rString == u"true";
+
+    return rBool || (rString == u"false");
+}
+
+/** convert string to boolean */
+bool Converter::convertBool( bool& rBool, std::string_view rString )
+{
+    rBool = rString == "true";
+
+    return rBool || (rString == "false");
+}
+
+/** convert boolean to string */
+void Converter::convertBool( OUStringBuffer& rBuffer, bool bValue )
+{
+    rBuffer.append( bValue );
+}
+
+/** convert string to percent */
+bool Converter::convertPercent( sal_Int32& rPercent, std::u16string_view rString )
+{
+    return convertMeasure( rPercent, rString, MeasureUnit::PERCENT );
+}
+
+/** convert string to percent */
+bool Converter::convertPercent( sal_Int32& rPercent, std::string_view rString )
+{
+    return convertMeasure( rPercent, rString, MeasureUnit::PERCENT );
+}
+
+/** convert percent to string */
+void Converter::convertPercent( OUStringBuffer& rBuffer, sal_Int32 nValue )
+{
+    rBuffer.append( nValue );
+    rBuffer.append( '%' );
+}
+
+/** convert string to pixel measure */
+bool Converter::convertMeasurePx( sal_Int32& rPixel, std::u16string_view rString )
+{
+    return convertMeasure( rPixel, rString, MeasureUnit::PIXEL );
+}
+
+/** convert string to pixel measure */
+bool Converter::convertMeasurePx( sal_Int32& rPixel, std::string_view rString )
+{
+    return convertMeasure( rPixel, rString, MeasureUnit::PIXEL );
+}
+
+/** convert pixel measure to string */
+void Converter::convertMeasurePx( OUStringBuffer& rBuffer, sal_Int32 nValue )
+{
+    rBuffer.append( nValue );
+    rBuffer.append( 'p' );
+    rBuffer.append( 'x' );
+}
+
+static int lcl_gethex( int nChar )
+{
+    if( nChar >= '0' && nChar <= '9' )
+        return nChar - '0';
+    else if( nChar >= 'a' && nChar <= 'f' )
+        return nChar - 'a' + 10;
+    else if( nChar >= 'A' && nChar <= 'F' )
+        return nChar - 'A' + 10;
+    else
+        return 0;
+}
+
+/** convert string to rgb color */
+template<typename V>
+static bool lcl_convertColor( sal_Int32& rColor, V rValue )
+{
+    if( rValue.size() != 7 || rValue[0] != '#' )
+        return false;
+
+    rColor = lcl_gethex( rValue[1] ) * 16 + lcl_gethex( rValue[2] );
+    rColor <<= 8;
+
+    rColor |= lcl_gethex( rValue[3] ) * 16 + lcl_gethex( rValue[4] );
+    rColor <<= 8;
+
+    rColor |= lcl_gethex( rValue[5] ) * 16 + lcl_gethex( rValue[6] );
+
+    return true;
+}
+
+/** convert string to rgb color */
+bool Converter::convertColor( sal_Int32& rColor, std::u16string_view rValue )
+{
+    return lcl_convertColor(rColor, rValue);
+}
+
+/** convert string to rgb color */
+bool Converter::convertColor( sal_Int32& rColor, std::string_view rValue )
+{
+    return lcl_convertColor(rColor, rValue);
+}
+
+const char aHexTab[] = "0123456789abcdef";
+
+/** convert color to string */
+void Converter::convertColor( OUStringBuffer& rBuffer, sal_Int32 nColor )
+{
+    rBuffer.append( '#' );
+
+    sal_uInt8 nCol = static_cast<sal_uInt8>(nColor >> 16);
+    rBuffer.append( sal_Unicode( aHexTab[ nCol >> 4 ] ) );
+    rBuffer.append( sal_Unicode( aHexTab[ nCol & 0xf ] ) );
+
+    nCol = static_cast<sal_uInt8>(nColor >> 8);
+    rBuffer.append( sal_Unicode( aHexTab[ nCol >> 4 ] ) );
+    rBuffer.append( sal_Unicode( aHexTab[ nCol & 0xf ] ) );
+
+    nCol = static_cast<sal_uInt8>(nColor);
+    rBuffer.append( sal_Unicode( aHexTab[ nCol >> 4 ] ) );
+    rBuffer.append( sal_Unicode( aHexTab[ nCol & 0xf ] ) );
+}
+
+/** convert string to number with optional min and max values */
+bool Converter::convertNumber(  sal_Int32& rValue,
+                                std::u16string_view aString,
+                                sal_Int32 nMin, sal_Int32 nMax )
+{
+    rValue = 0;
+    sal_Int64 nNumber = 0;
+    bool bRet = convertNumber64(nNumber,aString,nMin,nMax);
+    if ( bRet )
+        rValue = static_cast<sal_Int32>(nNumber);
+    return bRet;
+}
+
+/** convert string to number with optional min and max values */
+bool Converter::convertNumber(  sal_Int32& rValue,
+                                std::string_view aString,
+                                sal_Int32 nMin, sal_Int32 nMax )
+{
+    rValue = 0;
+    sal_Int64 nNumber = 0;
+    bool bRet = convertNumber64(nNumber,aString,nMin,nMax);
+    if ( bRet )
+        rValue = static_cast<sal_Int32>(nNumber);
+    return bRet;
+}
+
+/** convert string to 64-bit number with optional min and max values */
+template<typename V>
+static bool lcl_convertNumber64( sal_Int64& rValue,
+                                 V aString,
+                                 sal_Int64 nMin, sal_Int64 nMax )
+{
+    sal_Int32 nPos = 0;
+    sal_Int32 const nLen = aString.size();
+
+    // skip white space
+    while( (nPos < nLen) && (aString[nPos] <= ' ') )
+        nPos++;
+
+    sal_Int32 nNumberStartPos = nPos;
+
+    if( nPos < nLen && '-' == aString[nPos] )
+    {
+        nPos++;
+    }
+
+    // get number
+    while( nPos < nLen &&
+           '0' <= aString[nPos] &&
+           '9' >= aString[nPos] )
+    {
+        nPos++;
+    }
+
+    rValue = toInt64_WithLength(aString.data() + nNumberStartPos, 10, nPos - nNumberStartPos);
+
+    if( rValue < nMin )
+        rValue = nMin;
+    else if( rValue > nMax )
+        rValue = nMax;
+
+    return ( nPos == nLen && rValue >= nMin && rValue <= nMax );
+}
+
+/** convert string to 64-bit number with optional min and max values */
+bool Converter::convertNumber64( sal_Int64& rValue,
+                                 std::u16string_view aString,
+                                 sal_Int64 nMin, sal_Int64 nMax )
+{
+    return lcl_convertNumber64(rValue, aString, nMin, nMax);
+}
+
+/** convert string to 64-bit number with optional min and max values */
+bool Converter::convertNumber64( sal_Int64& rValue,
+                                 std::string_view aString,
+                                 sal_Int64 nMin, sal_Int64 nMax )
+{
+    return lcl_convertNumber64(rValue, aString, nMin, nMax);
+}
+
+
+/** convert double number to string (using ::rtl::math) */
+void Converter::convertDouble(  OUStringBuffer& rBuffer,
+                                double fNumber,
+                                bool bWriteUnits,
+                                sal_Int16 nSourceUnit,
+                                sal_Int16 nTargetUnit)
+{
+    if(MeasureUnit::PERCENT == nSourceUnit)
+    {
+        OSL_ENSURE( nTargetUnit == MeasureUnit::PERCENT, "MeasureUnit::PERCENT only maps to MeasureUnit::PERCENT!" );
+        ::rtl::math::doubleToUStringBuffer( rBuffer, fNumber, rtl_math_StringFormat_Automatic, rtl_math_DecimalPlaces_Max, '.', true);
+        if(bWriteUnits)
+            rBuffer.append('%');
+    }
+    else
+    {
+        OUStringBuffer sUnit;
+        double fFactor = GetConversionFactor(sUnit, nSourceUnit, nTargetUnit);
+        if(fFactor != 1.0)
+            fNumber *= fFactor;
+        ::rtl::math::doubleToUStringBuffer( rBuffer, fNumber, rtl_math_StringFormat_Automatic, rtl_math_DecimalPlaces_Max, '.', true);
+        if(bWriteUnits)
+            rBuffer.append(sUnit);
+    }
+}
+
+/** convert double number to string (using ::rtl::math) */
+void Converter::convertDouble( OUStringBuffer& rBuffer, double fNumber)
+{
+    ::rtl::math::doubleToUStringBuffer( rBuffer, fNumber, rtl_math_StringFormat_Automatic, rtl_math_DecimalPlaces_Max, '.', true);
+}
+
+/** convert string to double number (using ::rtl::math) */
+bool Converter::convertDouble(double& rValue,
+    std::u16string_view rString, sal_Int16 nSourceUnit, sal_Int16 nTargetUnit)
+{
+    if (!convertDouble(rValue, rString))
+        return false;
+
+    OUStringBuffer sUnit;
+    // fdo#48969: switch source and target because factor is used to divide!
+    double const fFactor =
+        GetConversionFactor(sUnit, nTargetUnit, nSourceUnit);
+    if(fFactor != 1.0 && fFactor != 0.0)
+        rValue /= fFactor;
+    return true;
+}
+
+/** convert string to double number (using ::rtl::math) */
+bool Converter::convertDouble(double& rValue,
+    std::string_view rString, sal_Int16 nSourceUnit, sal_Int16 nTargetUnit)
+{
+    if (!convertDouble(rValue, rString))
+        return false;
+
+    OStringBuffer sUnit;
+    // fdo#48969: switch source and target because factor is used to divide!
+    double const fFactor =
+        GetConversionFactor(sUnit, nTargetUnit, nSourceUnit);
+    if(fFactor != 1.0 && fFactor != 0.0)
+        rValue /= fFactor;
+    return true;
+}
+
+/** convert string to double number (using ::rtl::math) */
+bool Converter::convertDouble(double& rValue, std::u16string_view rString)
+{
+    rtl_math_ConversionStatus eStatus;
+    rValue = rtl_math_uStringToDouble(rString.data(),
+                                     rString.data() + rString.size(),
+                                     /*cDecSeparator*/'.', /*cGroupSeparator*/',',
+                                     &eStatus, nullptr);
+    return ( eStatus == rtl_math_ConversionStatus_Ok );
+}
+
+/** convert string to double number (using ::rtl::math) */
+bool Converter::convertDouble(double& rValue, std::string_view rString)
+{
+    rtl_math_ConversionStatus eStatus;
+    rValue = rtl_math_stringToDouble(rString.data(),
+                                     rString.data() + rString.size(),
+                                     /*cDecSeparator*/'.', /*cGroupSeparator*/',',
+                                     &eStatus, nullptr);
+    return ( eStatus == rtl_math_ConversionStatus_Ok );
+}
+
+/** convert number, 10th of degrees with range [0..3600] to SVG angle */
+void Converter::convertAngle(OUStringBuffer& rBuffer, sal_Int16 const nAngle,
+        SvtSaveOptions::ODFSaneDefaultVersion const nVersion)
+{
+    if (nVersion < SvtSaveOptions::ODFSVER_012 || nVersion == SvtSaveOptions::ODFSVER_012_EXT_COMPAT)
+    {
+        // wrong, but backward compatible with OOo/LO < 4.4
+        rBuffer.append(static_cast<sal_Int32>(nAngle));
+    }
+    else
+    { // OFFICE-3774 tdf#89475 write valid ODF 1.2 angle; needs LO 4.4 to import
+        double fAngle(double(nAngle) / 10.0);
+        ::sax::Converter::convertDouble(rBuffer, fAngle);
+        rBuffer.append("deg");
+    }
+}
+
+/** convert SVG angle to number, 10th of degrees with range [0..3600] */
+bool Converter::convertAngle(sal_Int16& rAngle, std::u16string_view rString,
+        bool const isWrongOOo10thDegAngle)
+{
+    // ODF 1.1 leaves it undefined what the number means, but ODF 1.2 says it's
+    // degrees, while OOo has historically used 10th of degrees :(
+    // So import degrees when we see the "deg" suffix but continue with 10th of
+    // degrees for now for the sake of existing OOo/LO documents, until the
+    // new versions that can read "deg" suffix are widely deployed and we can
+    // start to write the "deg" suffix.
+    sal_Int32 nValue(0);
+    double fValue(0.0);
+    bool bRet = ::sax::Converter::convertDouble(fValue, rString);
+    if (std::u16string_view::npos != rString.find(u"deg"))
+    {
+        nValue = fValue * 10.0;
+    }
+    else if (std::u16string_view::npos != rString.find(u"grad"))
+    {
+        nValue = (fValue * 9.0 / 10.0) * 10.0;
+    }
+    else if (std::u16string_view::npos != rString.find(u"rad"))
+    {
+        nValue = basegfx::rad2deg<10>(fValue);
+    }
+    else // no explicit unit
+    {
+        if (isWrongOOo10thDegAngle)
+        {
+            nValue = fValue; // wrong, but backward compatible with OOo/LO < 7.0
+        }
+        else
+        {
+            nValue = fValue * 10.0; // ODF 1.2
+        }
+    }
+    // limit to valid range [0..3600]
+    nValue = nValue % 3600;
+    if (nValue < 0)
+    {
+        nValue += 3600;
+    }
+    assert(0 <= nValue && nValue <= 3600);
+    if (bRet)
+    {
+        rAngle = sal::static_int_cast<sal_Int16>(nValue);
+    }
+    return bRet;
+}
+
+/** convert SVG angle to number, 10th of degrees with range [0..3600] */
+bool Converter::convertAngle(sal_Int16& rAngle, std::string_view rString,
+        bool const isWrongOOo10thDegAngle)
+{
+    // ODF 1.1 leaves it undefined what the number means, but ODF 1.2 says it's
+    // degrees, while OOo has historically used 10th of degrees :(
+    // So import degrees when we see the "deg" suffix but continue with 10th of
+    // degrees for now for the sake of existing OOo/LO documents, until the
+    // new versions that can read "deg" suffix are widely deployed and we can
+    // start to write the "deg" suffix.
+    sal_Int32 nValue(0);
+    double fValue(0.0);
+    bool bRet = ::sax::Converter::convertDouble(fValue, rString);
+    if (std::string_view::npos != rString.find("deg"))
+    {
+        nValue = fValue * 10.0;
+    }
+    else if (std::string_view::npos != rString.find("grad"))
+    {
+        nValue = (fValue * 9.0 / 10.0) * 10.0;
+    }
+    else if (std::string_view::npos != rString.find("rad"))
+    {
+        nValue = basegfx::rad2deg<10>(fValue);
+    }
+    else // no explicit unit
+    {
+        if (isWrongOOo10thDegAngle)
+        {
+            nValue = fValue; // wrong, but backward compatible with OOo/LO < 7.0
+        }
+        else
+        {
+            nValue = fValue * 10.0; // ODF 1.2
+        }
+    }
+    // limit to valid range [0..3600]
+    nValue = nValue % 3600;
+    if (nValue < 0)
+    {
+        nValue += 3600;
+    }
+    assert(0 <= nValue && nValue <= 3600);
+    if (bRet)
+    {
+        rAngle = sal::static_int_cast<sal_Int16>(nValue);
+    }
+    return bRet;
+}
+
+/** convert double to ISO "duration" string; negative durations allowed */
+void Converter::convertDuration(OUStringBuffer& rBuffer,
+                                const double fTime)
+{
+    double fValue = fTime;
+
+    // take care of negative durations as specified in:
+    // XML Schema, W3C Working Draft 07 April 2000, section 3.2.6.1
+    if (fValue < 0.0)
+    {
+        rBuffer.append('-');
+        fValue = - fValue;
+    }
+
+    rBuffer.append( "PT" );
+    fValue *= 24;
+    double fHoursValue = ::rtl::math::approxFloor (fValue);
+    fValue -= fHoursValue;
+    fValue *= 60;
+    double fMinsValue = ::rtl::math::approxFloor (fValue);
+    fValue -= fMinsValue;
+    fValue *= 60;
+    double fSecsValue = ::rtl::math::approxFloor (fValue);
+    fValue -= fSecsValue;
+    double fNanoSecsValue;
+    if (fValue > 0.00000000001)
+        fNanoSecsValue = ::rtl::math::round( fValue, XML_MAXDIGITSCOUNT_TIME - 5);
+    else
+        fNanoSecsValue = 0.0;
+
+    if (fNanoSecsValue == 1.0)
+    {
+        fNanoSecsValue = 0.0;
+        fSecsValue += 1.0;
+    }
+    if (fSecsValue >= 60.0)
+    {
+        fSecsValue -= 60.0;
+        fMinsValue += 1.0;
+    }
+    if (fMinsValue >= 60.0)
+    {
+        fMinsValue -= 60.0;
+        fHoursValue += 1.0;
+    }
+
+    if (fHoursValue < 10)
+        rBuffer.append( '0');
+    rBuffer.append( sal_Int32( fHoursValue));
+    rBuffer.append( 'H');
+    if (fMinsValue < 10)
+        rBuffer.append( '0');
+    rBuffer.append( sal_Int32( fMinsValue));
+    rBuffer.append( 'M');
+    if (fSecsValue < 10)
+        rBuffer.append( '0');
+    rBuffer.append( sal_Int32( fSecsValue));
+    if (fNanoSecsValue > 0.0)
+    {
+        OUString aNS( ::rtl::math::doubleToUString( fValue,
+                    rtl_math_StringFormat_F, XML_MAXDIGITSCOUNT_TIME - 5, '.',
+                    true));
+        if ( aNS.getLength() > 2 )
+        {
+            rBuffer.append( '.');
+            rBuffer.append( aNS.subView(2) );     // strip "0."
+        }
+    }
+    rBuffer.append( 'S');
+}
+
+static std::u16string_view trim(std::u16string_view in) {
+  auto left = in.begin();
+  for (;; ++left) {
+    if (left == in.end())
+      return std::u16string_view();
+    if (!isspace(*left))
+      break;
+  }
+  auto right = in.end() - 1;
+  for (; right > left && isspace(*right); --right);
+  return std::u16string_view(&*left, std::distance(left, right) + 1);
+}
+
+static std::string_view trim(std::string_view in) {
+  auto left = in.begin();
+  for (;; ++left) {
+    if (left == in.end())
+      return std::string_view();
+    if (!isspace(*left))
+      break;
+  }
+  auto right = in.end() - 1;
+  for (; right > left && isspace(*right); --right);
+  return std::string_view(&*left, std::distance(left, right) + 1);
+}
+
+/** helper function of Converter::convertDuration */
+template<typename V>
+static bool convertDurationHelper(double& rfTime, V pStr)
+{
+    // negative time duration?
+    bool bIsNegativeDuration = false;
+    if ( '-' == (*pStr) )
+    {
+        bIsNegativeDuration = true;
+        pStr++;
+    }
+
+    if ( *pStr != 'P' && *pStr != 'p' )            // duration must start with "P"
+        return false;
+    pStr++;
+
+    OUStringBuffer sDoubleStr;
+    bool bSuccess = true;
+    bool bDone = false;
+    bool bTimePart = false;
+    bool bIsFraction = false;
+    sal_Int32 nDays  = 0;
+    sal_Int32 nHours = 0;
+    sal_Int32 nMins  = 0;
+    sal_Int32 nSecs  = 0;
+    sal_Int32 nTemp = 0;
+
+    while ( bSuccess && !bDone )
+    {
+        sal_Unicode c = *(pStr++);
+        if ( !c )                               // end
+            bDone = true;
+        else if ( '0' <= c && '9' >= c )
+        {
+            if ( nTemp >= SAL_MAX_INT32 / 10 )
+                bSuccess = false;
+            else
+            {
+                if ( !bIsFraction )
+                {
+                    nTemp *= 10;
+                    nTemp += (c - u'0');
+                }
+                else
+                {
+                    sDoubleStr.append(c);
+                }
+            }
+        }
+        else if ( bTimePart )
+        {
+            if ( c == 'H' || c == 'h' )
+            {
+                nHours = nTemp;
+                nTemp = 0;
+            }
+            else if ( c == 'M' || c == 'm')
+            {
+                nMins = nTemp;
+                nTemp = 0;
+            }
+            else if ( (c == ',') || (c == '.') )
+            {
+                nSecs = nTemp;
+                nTemp = 0;
+                bIsFraction = true;
+                sDoubleStr = "0.";
+            }
+            else if ( c == 'S' || c == 's' )
+            {
+                if ( !bIsFraction )
+                {
+                    nSecs = nTemp;
+                    nTemp = 0;
+                    sDoubleStr = "0.0";
+                }
+            }
+            else
+                bSuccess = false;               // invalid character
+        }
+        else
+        {
+            if ( c == 'T' || c == 't' )            // "T" starts time part
+                bTimePart = true;
+            else if ( c == 'D' || c == 'd')
+            {
+                nDays = nTemp;
+                nTemp = 0;
+            }
+            else if ( c == 'Y' || c == 'y' || c == 'M' || c == 'm' )
+            {
+                //! how many days is a year or month?
+
+                OSL_FAIL( "years or months in duration: not implemented");
+                bSuccess = false;
+            }
+            else
+                bSuccess = false;               // invalid character
+        }
+    }
+
+    if ( bSuccess )
+    {
+        if ( nDays )
+            nHours += nDays * 24;               // add the days to the hours part
+        double fHour = nHours;
+        double fMin = nMins;
+        double fSec = nSecs;
+        double fFraction = sDoubleStr.makeStringAndClear().toDouble();
+        double fTempTime = fHour / 24;
+        fTempTime += fMin / (24 * 60);
+        fTempTime += fSec / (24 * 60 * 60);
+        fTempTime += fFraction / (24 * 60 * 60);
+
+        // negative duration?
+        if ( bIsNegativeDuration )
+        {
+            fTempTime = -fTempTime;
+        }
+
+        rfTime = fTempTime;
+    }
+    return bSuccess;
+}
+
+/** convert ISO "duration" string to double; negative durations allowed */
+bool Converter::convertDuration(double& rfTime,
+                                std::string_view rString)
+{
+    std::string_view aTrimmed = trim(rString);
+    const char* pStr = aTrimmed.data();
+
+    return convertDurationHelper(rfTime, pStr);
+}
+
+/** convert util::Duration to ISO8601 "duration" string */
+void Converter::convertDuration(OUStringBuffer& rBuffer,
+        const ::util::Duration& rDuration)
+{
+    if (rDuration.Negative)
+    {
+        rBuffer.append('-');
+    }
+    rBuffer.append('P');
+    const bool bHaveDate(rDuration.Years  != 0 ||
+                         rDuration.Months != 0 ||
+                         rDuration.Days   != 0);
+    if (rDuration.Years)
+    {
+        rBuffer.append(static_cast<sal_Int32>(rDuration.Years));
+        rBuffer.append('Y');
+    }
+    if (rDuration.Months)
+    {
+        rBuffer.append(static_cast<sal_Int32>(rDuration.Months));
+        rBuffer.append('M');
+    }
+    if (rDuration.Days)
+    {
+        rBuffer.append(static_cast<sal_Int32>(rDuration.Days));
+        rBuffer.append('D');
+    }
+    if ( rDuration.Hours != 0
+         || rDuration.Minutes != 0
+         || rDuration.Seconds != 0
+         || rDuration.NanoSeconds != 0 )
+    {
+        rBuffer.append('T'); // time separator
+        if (rDuration.Hours)
+        {
+            rBuffer.append(static_cast<sal_Int32>(rDuration.Hours));
+            rBuffer.append('H');
+        }
+        if (rDuration.Minutes)
+        {
+            rBuffer.append(static_cast<sal_Int32>(rDuration.Minutes));
+            rBuffer.append('M');
+        }
+        if (rDuration.Seconds != 0 || rDuration.NanoSeconds != 0)
+        {
+            // seconds must not be omitted (i.e. ".42S" is not valid)
+            rBuffer.append(static_cast<sal_Int32>(rDuration.Seconds));
+            if (rDuration.NanoSeconds)
+            {
+                OSL_ENSURE(rDuration.NanoSeconds < 1000000000,"NanoSeconds cannot be more than 999 999 999");
+                rBuffer.append('.');
+                std::ostringstream ostr;
+                ostr.fill('0');
+                ostr.width(9);
+                ostr << rDuration.NanoSeconds;
+                rBuffer.append(OUString::createFromAscii(ostr.str().c_str()));
+            }
+            rBuffer.append('S');
+        }
+    }
+    else if (!bHaveDate)
+    {
+        // zero duration: XMLSchema-2 says there must be at least one component
+        rBuffer.append('0');
+        rBuffer.append('D');
+    }
+}
+
+namespace {
+
+enum Result { R_NOTHING, R_OVERFLOW, R_SUCCESS };
+
+}
+
+template <typename V>
+static Result
+readUnsignedNumber(V rString,
+    size_t & io_rnPos, sal_Int32 & o_rNumber)
+{
+    size_t nPos(io_rnPos);
+
+    while (nPos < rString.size())
+    {
+        const typename V::value_type c = rString[nPos];
+        if (('0' > c) || (c > '9'))
+            break;
+        ++nPos;
+    }
+
+    if (io_rnPos == nPos) // read something?
+    {
+        o_rNumber = -1;
+        return R_NOTHING;
+    }
+
+    const sal_Int64 nTemp = toInt64_WithLength(rString.data() + io_rnPos, 10, nPos - io_rnPos);
+
+    const bool bOverflow = (nTemp >= SAL_MAX_INT32);
+
+    io_rnPos = nPos;
+    o_rNumber = nTemp;
+    return bOverflow ? R_OVERFLOW : R_SUCCESS;
+}
+
+template<typename V>
+static Result
+readUnsignedNumberMaxDigits(int maxDigits,
+                            V rString, size_t & io_rnPos,
+                            sal_Int32 & o_rNumber)
+{
+    bool bOverflow(false);
+    sal_Int64 nTemp(0);
+    size_t nPos(io_rnPos);
+    OSL_ENSURE(maxDigits >= 0, "negative amount of digits makes no sense");
+
+    while (nPos < rString.size())
+    {
+        const sal_Unicode c = rString[nPos];
+        if (('0' <= c) && (c <= '9'))
+        {
+            if (maxDigits > 0)
+            {
+                nTemp *= 10;
+                nTemp += (c - u'0');
+                if (nTemp >= SAL_MAX_INT32)
+                {
+                    bOverflow = true;
+                }
+                --maxDigits;
+            }
+        }
+        else
+        {
+            break;
+        }
+        ++nPos;
+    }
+
+    if (io_rnPos == nPos) // read something?
+    {
+        o_rNumber = -1;
+        return R_NOTHING;
+    }
+
+    io_rnPos = nPos;
+    o_rNumber = nTemp;
+    return bOverflow ? R_OVERFLOW : R_SUCCESS;
+}
+
+template<typename V>
+static bool
+readDurationT(V rString, size_t & io_rnPos)
+{
+    if ((io_rnPos < rString.size()) &&
+        (rString[io_rnPos] == 'T' || rString[io_rnPos] == 't'))
+    {
+        ++io_rnPos;
+        return true;
+    }
+    return false;
+}
+
+template<typename V>
+static bool
+readDurationComponent(V rString,
+    size_t & io_rnPos, sal_Int32 & io_rnTemp, bool & io_rbTimePart,
+    sal_Int32 & o_rnTarget, const sal_Unicode cLower, const sal_Unicode cUpper)
+{
+    if (io_rnPos < rString.size())
+    {
+        if (cLower == rString[io_rnPos] || cUpper == rString[io_rnPos])
+        {
+            ++io_rnPos;
+            if (-1 != io_rnTemp)
+            {
+                o_rnTarget = io_rnTemp;
+                io_rnTemp = -1;
+                if (!io_rbTimePart)
+                {
+                    io_rbTimePart = readDurationT(rString, io_rnPos);
+                }
+                return (R_OVERFLOW !=
+                        readUnsignedNumber(rString, io_rnPos, io_rnTemp));
+            }
+            else
+            {
+                return false;
+            }
+        }
+    }
+    return true;
+}
+
+/** convert ISO8601 "duration" string to util::Duration */
+bool Converter::convertDuration(util::Duration& rDuration,
+                                std::u16string_view rString)
+{
+    std::u16string_view string = trim(rString);
+    size_t nPos(0);
+
+    bool bIsNegativeDuration(false);
+    if (!string.empty() && ('-' == string[0]))
+    {
+        bIsNegativeDuration = true;
+        ++nPos;
+    }
+
+    if (nPos < string.size()
+        && string[nPos] != 'P' && string[nPos] != 'p') // duration must start with "P"
+    {
+        return false;
+    }
+
+    ++nPos;
+
+    /// last read number; -1 == no valid number! always reset after using!
+    sal_Int32 nTemp(-1);
+    bool bTimePart(false); // have we read 'T'?
+    bool bSuccess(false);
+    sal_Int32 nYears(0);
+    sal_Int32 nMonths(0);
+    sal_Int32 nDays(0);
+    sal_Int32 nHours(0);
+    sal_Int32 nMinutes(0);
+    sal_Int32 nSeconds(0);
+    sal_Int32 nNanoSeconds(0);
+
+    bTimePart = readDurationT(string, nPos);
+    bSuccess = (R_SUCCESS == readUnsignedNumber(string, nPos, nTemp));
+
+    if (!bTimePart && bSuccess)
+    {
+        bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                     nYears, 'y', 'Y');
+    }
+
+    if (!bTimePart && bSuccess)
+    {
+        bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                     nMonths, 'm', 'M');
+    }
+
+    if (!bTimePart && bSuccess)
+    {
+        bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                     nDays, 'd', 'D');
+    }
+
+    if (bTimePart)
+    {
+        if (-1 == nTemp) // a 'T' must be followed by a component
+        {
+            bSuccess = false;
+        }
+
+        if (bSuccess)
+        {
+            bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                         nHours, 'h', 'H');
+        }
+
+        if (bSuccess)
+        {
+            bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                         nMinutes, 'm', 'M');
+        }
+
+        // eeek! seconds are icky.
+        if ((nPos < string.size()) && bSuccess)
+        {
+            if (string[nPos] == '.' ||
+                string[nPos] == ',')
+            {
+                ++nPos;
+                if (-1 != nTemp)
+                {
+                    nSeconds = nTemp;
+                    nTemp = -1;
+                    const sal_Int32 nStart(nPos);
+                    bSuccess = readUnsignedNumberMaxDigits(9, string, nPos, nTemp) == R_SUCCESS;
+                    if ((nPos < string.size()) && bSuccess)
+                    {
+                        if (-1 != nTemp)
+                        {
+                            nNanoSeconds = nTemp;
+                            sal_Int32 nDigits = nPos - nStart;
+                            assert(nDigits >= 0);
+                            for (; nDigits < 9; ++nDigits)
+                            {
+                                nNanoSeconds *= 10;
+                            }
+                            nTemp=-1;
+                            if ('S' == string[nPos] || 's' == string[nPos])
+                            {
+                                ++nPos;
+                            }
+                            else
+                            {
+                                bSuccess = false;
+                            }
+                        }
+                        else
+                        {
+                            bSuccess = false;
+                        }
+                    }
+                }
+                else
+                {
+                    bSuccess = false;
+                }
+            }
+            else if ('S' == string[nPos] || 's' == string[nPos])
+            {
+                ++nPos;
+                if (-1 != nTemp)
+                {
+                    nSeconds = nTemp;
+                    nTemp = -1;
+                }
+                else
+                {
+                    bSuccess = false;
+                }
+            }
+        }
+    }
+
+    if (nPos != string.size()) // string not processed completely?
+    {
+        bSuccess = false;
+    }
+
+    if (nTemp != -1) // unprocessed number?
+    {
+        bSuccess = false;
+    }
+
+    if (bSuccess)
+    {
+        rDuration.Negative      = bIsNegativeDuration;
+        rDuration.Years         = static_cast<sal_Int16>(nYears);
+        rDuration.Months        = static_cast<sal_Int16>(nMonths);
+        rDuration.Days          = static_cast<sal_Int16>(nDays);
+        rDuration.Hours         = static_cast<sal_Int16>(nHours);
+        rDuration.Minutes       = static_cast<sal_Int16>(nMinutes);
+        rDuration.Seconds       = static_cast<sal_Int16>(nSeconds);
+        rDuration.NanoSeconds   = nNanoSeconds;
+    }
+
+    return bSuccess;
+}
+
+/** convert ISO8601 "duration" string to util::Duration */
+bool Converter::convertDuration(util::Duration& rDuration,
+                                std::string_view rString)
+{
+    std::string_view string = trim(rString);
+    size_t nPos(0);
+
+    bool bIsNegativeDuration(false);
+    if (!string.empty() && ('-' == string[0]))
+    {
+        bIsNegativeDuration = true;
+        ++nPos;
+    }
+
+    if (nPos < string.size()
+        && string[nPos] != 'P' && string[nPos] != 'p') // duration must start with "P"
+    {
+        return false;
+    }
+
+    ++nPos;
+
+    /// last read number; -1 == no valid number! always reset after using!
+    sal_Int32 nTemp(-1);
+    bool bTimePart(false); // have we read 'T'?
+    bool bSuccess(false);
+    sal_Int32 nYears(0);
+    sal_Int32 nMonths(0);
+    sal_Int32 nDays(0);
+    sal_Int32 nHours(0);
+    sal_Int32 nMinutes(0);
+    sal_Int32 nSeconds(0);
+    sal_Int32 nNanoSeconds(0);
+
+    bTimePart = readDurationT(string, nPos);
+    bSuccess = (R_SUCCESS == readUnsignedNumber(string, nPos, nTemp));
+
+    if (!bTimePart && bSuccess)
+    {
+        bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                     nYears, 'y', 'Y');
+    }
+
+    if (!bTimePart && bSuccess)
+    {
+        bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                     nMonths, 'm', 'M');
+    }
+
+    if (!bTimePart && bSuccess)
+    {
+        bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                     nDays, 'd', 'D');
+    }
+
+    if (bTimePart)
+    {
+        if (-1 == nTemp) // a 'T' must be followed by a component
+        {
+            bSuccess = false;
+        }
+
+        if (bSuccess)
+        {
+            bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                         nHours, 'h', 'H');
+        }
+
+        if (bSuccess)
+        {
+            bSuccess = readDurationComponent(string, nPos, nTemp, bTimePart,
+                         nMinutes, 'm', 'M');
+        }
+
+        // eeek! seconds are icky.
+        if ((nPos < string.size()) && bSuccess)
+        {
+            if (string[nPos] == '.' ||
+                string[nPos] == ',')
+            {
+                ++nPos;
+                if (-1 != nTemp)
+                {
+                    nSeconds = nTemp;
+                    nTemp = -1;
+                    const sal_Int32 nStart(nPos);
+                    bSuccess = readUnsignedNumberMaxDigits(9, string, nPos, nTemp) == R_SUCCESS;
+                    if ((nPos < string.size()) && bSuccess)
+                    {
+                        if (-1 != nTemp)
+                        {
+                            nNanoSeconds = nTemp;
+                            sal_Int32 nDigits = nPos - nStart;
+                            assert(nDigits >= 0);
+                            for (; nDigits < 9; ++nDigits)
+                            {
+                                nNanoSeconds *= 10;
+                            }
+                            nTemp=-1;
+                            if ('S' == string[nPos] || 's' == string[nPos])
+                            {
+                                ++nPos;
+                            }
+                            else
+                            {
+                                bSuccess = false;
+                            }
+                        }
+                        else
+                        {
+                            bSuccess = false;
+                        }
+                    }
+                }
+                else
+                {
+                    bSuccess = false;
+                }
+            }
+            else if ('S' == string[nPos] || 's' == string[nPos])
+            {
+                ++nPos;
+                if (-1 != nTemp)
+                {
+                    nSeconds = nTemp;
+                    nTemp = -1;
+                }
+                else
+                {
+                    bSuccess = false;
+                }
+            }
+        }
+    }
+
+    if (nPos != string.size()) // string not processed completely?
+    {
+        bSuccess = false;
+    }
+
+    if (nTemp != -1) // unprocessed number?
+    {
+        bSuccess = false;
+    }
+
+    if (bSuccess)
+    {
+        rDuration.Negative      = bIsNegativeDuration;
+        rDuration.Years         = static_cast<sal_Int16>(nYears);
+        rDuration.Months        = static_cast<sal_Int16>(nMonths);
+        rDuration.Days          = static_cast<sal_Int16>(nDays);
+        rDuration.Hours         = static_cast<sal_Int16>(nHours);
+        rDuration.Minutes       = static_cast<sal_Int16>(nMinutes);
+        rDuration.Seconds       = static_cast<sal_Int16>(nSeconds);
+        rDuration.NanoSeconds   = nNanoSeconds;
+    }
+
+    return bSuccess;
+}
+
+static void
+lcl_AppendTimezone(OUStringBuffer & i_rBuffer, int const nOffset)
+{
+    if (0 == nOffset)
+    {
+        i_rBuffer.append('Z');
+    }
+    else
+    {
+        if (0 < nOffset)
+        {
+            i_rBuffer.append('+');
+        }
+        else
+        {
+            i_rBuffer.append('-');
+        }
+        const sal_Int32 nHours  (abs(nOffset) / 60);
+        const sal_Int32 nMinutes(abs(nOffset) % 60);
+        SAL_WARN_IF(nHours > 14 || (nHours == 14 && nMinutes > 0),
+                "sax", "convertDateTime: timezone overflow");
+        if (nHours < 10)
+        {
+            i_rBuffer.append('0');
+        }
+        i_rBuffer.append(nHours);
+        i_rBuffer.append(':');
+        if (nMinutes < 10)
+        {
+            i_rBuffer.append('0');
+        }
+        i_rBuffer.append(nMinutes);
+    }
+}
+
+/** convert util::Date to ISO "date" string */
+void Converter::convertDate(
+        OUStringBuffer& i_rBuffer,
+        const util::Date& i_rDate,
+        sal_Int16 const*const pTimeZoneOffset)
+{
+    const util::DateTime dt(0, 0, 0, 0,
+        i_rDate.Day, i_rDate.Month, i_rDate.Year, false);
+    convertDateTime(i_rBuffer, dt, pTimeZoneOffset);
+}
+
+static void convertTime(
+        OUStringBuffer& i_rBuffer,
+        const css::util::DateTime& i_rDateTime)
+{
+    if (i_rDateTime.Hours   < 10) {
+        i_rBuffer.append('0');
+    }
+    i_rBuffer.append( static_cast<sal_Int32>(i_rDateTime.Hours)   )
+             .append(':');
+    if (i_rDateTime.Minutes < 10) {
+        i_rBuffer.append('0');
+    }
+    i_rBuffer.append( static_cast<sal_Int32>(i_rDateTime.Minutes) )
+             .append(':');
+    if (i_rDateTime.Seconds < 10) {
+        i_rBuffer.append('0');
+    }
+    i_rBuffer.append( static_cast<sal_Int32>(i_rDateTime.Seconds) );
+    if (i_rDateTime.NanoSeconds > 0) {
+        OSL_ENSURE(i_rDateTime.NanoSeconds < 1000000000,"NanoSeconds cannot be more than 999 999 999");
+        i_rBuffer.append('.');
+        std::ostringstream ostr;
+        ostr.fill('0');
+        ostr.width(9);
+        ostr << i_rDateTime.NanoSeconds;
+        i_rBuffer.append(OUString::createFromAscii(ostr.str().c_str()));
+    }
+}
+
+static void convertTimeZone(
+        OUStringBuffer& i_rBuffer,
+        const css::util::DateTime& i_rDateTime,
+        sal_Int16 const* pTimeZoneOffset)
+{
+    if (pTimeZoneOffset)
+    {
+        lcl_AppendTimezone(i_rBuffer, *pTimeZoneOffset);
+    }
+    else if (i_rDateTime.IsUTC)
+    {
+        lcl_AppendTimezone(i_rBuffer, 0);
+    }
+}
+
+/** convert util::DateTime to ISO "time" or "dateTime" string */
+void Converter::convertTimeOrDateTime(
+        OUStringBuffer& i_rBuffer,
+        const css::util::DateTime& i_rDateTime)
+{
+    if (i_rDateTime.Year == 0 ||
+        i_rDateTime.Month < 1 || i_rDateTime.Month > 12 ||
+        i_rDateTime.Day < 1 || i_rDateTime.Day > 31)
+    {
+        convertTime(i_rBuffer, i_rDateTime);
+        convertTimeZone(i_rBuffer, i_rDateTime, nullptr);
+    }
+    else
+    {
+        convertDateTime(i_rBuffer, i_rDateTime, nullptr, true);
+    }
+}
+
+/** convert util::DateTime to ISO "date" or "dateTime" string */
+void Converter::convertDateTime(
+        OUStringBuffer& i_rBuffer,
+        const css::util::DateTime& i_rDateTime,
+        sal_Int16 const*const pTimeZoneOffset,
+        bool i_bAddTimeIf0AM )
+{
+    const sal_Unicode dash('-');
+    const sal_Unicode zero('0');
+
+    sal_Int32 const nYear(abs(i_rDateTime.Year));
+    if (i_rDateTime.Year < 0) {
+        i_rBuffer.append(dash); // negative
+    }
+    if (nYear < 1000) {
+        i_rBuffer.append(zero);
+    }
+    if (nYear < 100) {
+        i_rBuffer.append(zero);
+    }
+    if (nYear < 10) {
+        i_rBuffer.append(zero);
+    }
+    i_rBuffer.append( OUString::number(nYear) + OUStringChar(dash) );
+    if( i_rDateTime.Month < 10 ) {
+        i_rBuffer.append(zero);
+    }
+    i_rBuffer.append( OUString::number(i_rDateTime.Month) + OUStringChar(dash) );
+    if( i_rDateTime.Day   < 10 ) {
+        i_rBuffer.append(zero);
+    }
+    i_rBuffer.append( static_cast<sal_Int32>(i_rDateTime.Day)   );
+
+    if( i_rDateTime.Seconds != 0 ||
+        i_rDateTime.Minutes != 0 ||
+        i_rDateTime.Hours   != 0 ||
+        i_bAddTimeIf0AM )
+    {
+        i_rBuffer.append('T');
+        convertTime(i_rBuffer, i_rDateTime);
+    }
+
+    convertTimeZone(i_rBuffer, i_rDateTime, pTimeZoneOffset);
+}
+
+/** convert ISO "date" or "dateTime" string to util::DateTime */
+bool Converter::parseDateTime(   util::DateTime& rDateTime,
+                                 std::u16string_view rString )
+{
+    bool isDateTime;
+    return parseDateOrDateTime(nullptr, rDateTime, isDateTime, nullptr,
+            rString);
+}
+
+/** convert ISO "date" or "dateTime" string to util::DateTime */
+bool Converter::parseDateTime(   util::DateTime& rDateTime,
+                                 std::string_view rString )
+{
+    bool isDateTime;
+    return parseDateOrDateTime(nullptr, rDateTime, isDateTime, nullptr,
+            rString);
+}
+
+static bool lcl_isLeapYear(const sal_uInt32 nYear)
+{
+    return ((nYear % 4) == 0)
+        && (((nYear % 100) != 0) || ((nYear % 400) == 0));
+}
+
+static sal_uInt16
+lcl_MaxDaysPerMonth(const sal_Int32 nMonth, const sal_Int32 nYear)
+{
+    static const sal_uInt16 s_MaxDaysPerMonth[12] =
+        { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+    assert(0 < nMonth && nMonth <= 12);
+    if ((2 == nMonth) && lcl_isLeapYear(nYear))
+    {
+        return 29;
+    }
+    return s_MaxDaysPerMonth[nMonth - 1];
+}
+
+static void lcl_ConvertToUTC(
+        sal_Int16 & o_rYear, sal_uInt16 & o_rMonth, sal_uInt16 & o_rDay,
+        sal_uInt16 & o_rHours, sal_uInt16 & o_rMinutes,
+        int const nSourceOffset)
+{
+    sal_Int16 nOffsetHours(abs(nSourceOffset) / 60);
+    sal_Int16 const nOffsetMinutes(abs(nSourceOffset) % 60);
+    o_rMinutes += nOffsetMinutes;
+    if (nSourceOffset < 0)
+    {
+        o_rMinutes += nOffsetMinutes;
+        if (60 <= o_rMinutes)
+        {
+            o_rMinutes -= 60;
+            ++nOffsetHours;
+        }
+        o_rHours += nOffsetHours;
+        if (o_rHours < 24)
+        {
+            return;
+        }
+        sal_Int16 nDayAdd(0);
+        while (24 <= o_rHours)
+        {
+            o_rHours -= 24;
+            ++nDayAdd;
+        }
+        if (o_rDay == 0)
+        {
+            return; // handle time without date - don't adjust what isn't there
+        }
+        o_rDay += nDayAdd;
+        sal_Int16 const nDaysInMonth(lcl_MaxDaysPerMonth(o_rMonth, o_rYear));
+        if (o_rDay <= nDaysInMonth)
+        {
+            return;
+        }
+        o_rDay -= nDaysInMonth;
+        ++o_rMonth;
+        if (o_rMonth <= 12)
+        {
+            return;
+        }
+        o_rMonth = 1;
+        ++o_rYear; // works for negative year too
+    }
+    else if (0 < nSourceOffset)
+    {
+        // argh everything is unsigned
+        if (o_rMinutes < nOffsetMinutes)
+        {
+            o_rMinutes += 60;
+            ++nOffsetHours;
+        }
+        o_rMinutes -= nOffsetMinutes;
+        sal_Int16 nDaySubtract(0);
+        while (o_rHours < nOffsetHours)
+        {
+            o_rHours += 24;
+            ++nDaySubtract;
+        }
+        o_rHours -= nOffsetHours;
+        if (o_rDay == 0)
+        {
+            return; // handle time without date - don't adjust what isn't there
+        }
+        if (nDaySubtract < o_rDay)
+        {
+            o_rDay -= nDaySubtract;
+            return;
+        }
+        sal_Int16 const nPrevMonth((o_rMonth == 1) ? 12 : o_rMonth - 1);
+        sal_Int16 const nDaysInMonth(lcl_MaxDaysPerMonth(nPrevMonth, o_rYear));
+        o_rDay += nDaysInMonth;
+        --o_rMonth;
+        if (0 == o_rMonth)
+        {
+            o_rMonth = 12;
+            --o_rYear; // works for negative year too
+        }
+        o_rDay -= nDaySubtract;
+    }
+}
+
+template <typename V>
+static bool
+readDateTimeComponent(V rString,
+    size_t & io_rnPos, sal_Int32 & o_rnTarget,
+    const sal_Int32 nMinLength, const bool bExactLength)
+{
+    const size_t nOldPos(io_rnPos);
+    sal_Int32 nTemp(0);
+    if (R_SUCCESS != readUnsignedNumber<V>(rString, io_rnPos, nTemp))
+    {
+        return false;
+    }
+    const sal_Int32 nTokenLength(io_rnPos - nOldPos);
+    if ((nTokenLength < nMinLength) ||
+        (bExactLength && (nTokenLength > nMinLength)))
+    {
+        return false; // bad length
+    }
+    o_rnTarget = nTemp;
+    return true;
+}
+
+/** convert ISO "date" or "dateTime" string to util::DateTime or util::Date */
+template<typename V>
+static bool lcl_parseDate(
+                bool & isNegative,
+                sal_Int32 & nYear, sal_Int32 & nMonth, sal_Int32 & nDay,
+                bool & bHaveTime,
+                size_t & nPos,
+                V string,
+                bool const bIgnoreInvalidOrMissingDate)
+{
+    bool bSuccess = true;
+
+    if (string.size() > nPos)
+    {
+        if ('-' == string[nPos])
+        {
+            isNegative = true;
+            ++nPos;
+        }
+    }
+
+    {
+        // While W3C XMLSchema specifies years with a minimum of 4 digits, be
+        // lenient in what we accept for years < 1000. One digit is acceptable
+        // if the remainders match.
+        bSuccess = readDateTimeComponent<V>(string, nPos, nYear, 1, false);
+        if (!bIgnoreInvalidOrMissingDate)
+        {
+            bSuccess &= (0 < nYear);
+        }
+        bSuccess &= (nPos < string.size()); // not last token
+    }
+    if (bSuccess && ('-' != string[nPos])) // separator
+    {
+        bSuccess = false;
+    }
+    if (bSuccess)
+    {
+        ++nPos;
+
+        bSuccess = readDateTimeComponent<V>(string, nPos, nMonth, 2, true);
+        if (!bIgnoreInvalidOrMissingDate)
+        {
+            bSuccess &= (0 < nMonth);
+        }
+        bSuccess &= (nMonth <= 12);
+        bSuccess &= (nPos < string.size()); // not last token
+    }
+    if (bSuccess && ('-' != string[nPos])) // separator
+    {
+        bSuccess = false;
+    }
+    if (bSuccess)
+    {
+        ++nPos;
+
+        bSuccess = readDateTimeComponent(string, nPos, nDay, 2, true);
+        if (!bIgnoreInvalidOrMissingDate)
+        {
+            bSuccess &= (0 < nDay);
+        }
+        if (nMonth > 0) // not possible to check if month was missing
+        {
+            bSuccess &= (nDay <= lcl_MaxDaysPerMonth(nMonth, nYear));
+        }
+        else assert(bIgnoreInvalidOrMissingDate);
+    }
+
+    if (bSuccess && (nPos < string.size()))
+    {
+        if ('T' == string[nPos] || 't' == string[nPos]) // time separator
+        {
+            bHaveTime = true;
+            ++nPos;
+        }
+    }
+
+    return bSuccess;
+}
+
+/** convert ISO "date" or "dateTime" string to util::DateTime or util::Date */
+template <typename V>
+static bool lcl_parseDateTime(
+                util::Date *const pDate, util::DateTime & rDateTime,
+                bool & rbDateTime,
+                std::optional<sal_Int16> *const pTimeZoneOffset,
+                V string,
+                bool const bIgnoreInvalidOrMissingDate)
+{
+    bool bSuccess = true;
+
+    string = trim(string);
+
+    bool isNegative(false);
+    sal_Int32 nYear(0);
+    sal_Int32 nMonth(0);
+    sal_Int32 nDay(0);
+    size_t nPos(0);
+    bool bHaveTime(false);
+
+    if (    !bIgnoreInvalidOrMissingDate
+        ||  string.find(':') == V::npos  // no time?
+        ||  (string.find('-') != V::npos
+             && string.find('-') < string.find(':')))
+    {
+        bSuccess &= lcl_parseDate<V>(isNegative, nYear, nMonth, nDay,
+                bHaveTime, nPos, string, bIgnoreInvalidOrMissingDate);
+    }
+    else
+    {
+        bHaveTime = true;
+    }
+
+    sal_Int32 nHours(0);
+    sal_Int32 nMinutes(0);
+    sal_Int32 nSeconds(0);
+    sal_Int32 nNanoSeconds(0);
+    if (bSuccess && bHaveTime)
+    {
+        {
+            bSuccess = readDateTimeComponent(string, nPos, nHours, 2, true);
+            bSuccess &= (0 <= nHours) && (nHours <= 24);
+            bSuccess &= (nPos < string.size()); // not last token
+        }
+        if (bSuccess && (':' != string[nPos])) // separator
+        {
+            bSuccess = false;
+        }
+        if (bSuccess)
+        {
+            ++nPos;
+
+            bSuccess = readDateTimeComponent(string, nPos, nMinutes, 2, true);
+            bSuccess &= (0 <= nMinutes) && (nMinutes < 60);
+            bSuccess &= (nPos < string.size()); // not last token
+        }
+        if (bSuccess && (':' != string[nPos])) // separator
+        {
+            bSuccess = false;
+        }
+        if (bSuccess)
+        {
+            ++nPos;
+
+            bSuccess = readDateTimeComponent(string, nPos, nSeconds, 2, true);
+            bSuccess &= (0 <= nSeconds) && (nSeconds < 60);
+        }
+        if (bSuccess && (nPos < string.size()) &&
+            ('.' == string[nPos] || ',' == string[nPos])) // fraction separator
+        {
+            ++nPos;
+            const sal_Int32 nStart(nPos);
+            sal_Int32 nTemp(0);
+            if (R_NOTHING == readUnsignedNumberMaxDigits<V>(9, string, nPos, nTemp))
+            {
+                bSuccess = false;
+            }
+            if (bSuccess)
+            {
+                sal_Int32 nDigits = std::min<sal_Int32>(nPos - nStart, 9);
+                assert(nDigits > 0);
+                for (; nDigits < 9; ++nDigits)
+                {
+                    nTemp *= 10;
+                }
+                nNanoSeconds = nTemp;
+            }
+        }
+
+        if (bSuccess && (nHours == 24))
+        {
+            if (!((0 == nMinutes) && (0 == nSeconds) && (0 == nNanoSeconds)))
+            {
+                bSuccess = false; // only 24:00:00 is valid
+            }
+        }
+    }
+
+    bool bHaveTimezone(false);
+    bool bHaveTimezonePlus(false);
+    bool bHaveTimezoneMinus(false);
+    if (bSuccess && (nPos < string.size()))
+    {
+        const sal_Unicode c(string[nPos]);
+        if ('+' == c)
+        {
+            bHaveTimezone = true;
+            bHaveTimezonePlus = true;
+            ++nPos;
+        }
+        else if ('-' == c)
+        {
+            bHaveTimezone = true;
+            bHaveTimezoneMinus = true;
+            ++nPos;
+        }
+        else if ('Z' == c || 'z' == c)
+        {
+            bHaveTimezone = true;
+            ++nPos;
+        }
+        else
+        {
+            bSuccess = false;
+        }
+    }
+    sal_Int32 nTimezoneHours(0);
+    sal_Int32 nTimezoneMinutes(0);
+    if (bSuccess && (bHaveTimezonePlus || bHaveTimezoneMinus))
+    {
+        bSuccess = readDateTimeComponent<V>(
+                        string, nPos, nTimezoneHours, 2, true);
+        bSuccess &= (0 <= nTimezoneHours) && (nTimezoneHours <= 14);
+        bSuccess &= (nPos < string.size()); // not last token
+        if (bSuccess && (':' != string[nPos])) // separator
+        {
+            bSuccess = false;
+        }
+        if (bSuccess)
+        {
+            ++nPos;
+
+            bSuccess = readDateTimeComponent<V>(
+                        string, nPos, nTimezoneMinutes, 2, true);
+            bSuccess &= (0 <= nTimezoneMinutes) && (nTimezoneMinutes < 60);
+        }
+        if (bSuccess && (nTimezoneHours == 14))
+        {
+            if (0 != nTimezoneMinutes)
+            {
+                bSuccess = false; // only +-14:00 is valid
+            }
+        }
+    }
+
+    bSuccess &= (nPos == string.size()); // trailing junk?
+
+    if (bSuccess)
+    {
+        sal_Int16 const nTimezoneOffset = (bHaveTimezoneMinus ? -1 : +1)
+                        * ((nTimezoneHours * 60) + nTimezoneMinutes);
+        if (!pDate || bHaveTime) // time is optional
+        {
+            rDateTime.Year =
+                (isNegative ? -1 : +1) * static_cast<sal_Int16>(nYear);
+            rDateTime.Month = static_cast<sal_uInt16>(nMonth);
+            rDateTime.Day = static_cast<sal_uInt16>(nDay);
+            rDateTime.Hours = static_cast<sal_uInt16>(nHours);
+            rDateTime.Minutes = static_cast<sal_uInt16>(nMinutes);
+            rDateTime.Seconds = static_cast<sal_uInt16>(nSeconds);
+            rDateTime.NanoSeconds = static_cast<sal_uInt32>(nNanoSeconds);
+            if (bHaveTimezone)
+            {
+                if (pTimeZoneOffset)
+                {
+                    *pTimeZoneOffset = nTimezoneOffset;
+                    rDateTime.IsUTC = (0 == nTimezoneOffset);
+                }
+                else
+                {
+                    lcl_ConvertToUTC(rDateTime.Year, rDateTime.Month,
+                            rDateTime.Day, rDateTime.Hours, rDateTime.Minutes,
+                            nTimezoneOffset);
+                    rDateTime.IsUTC = true;
+                }
+            }
+            else
+            {
+                if (pTimeZoneOffset)
+                {
+                    pTimeZoneOffset->reset();
+                }
+                rDateTime.IsUTC = false;
+            }
+            rbDateTime = bHaveTime;
+        }
+        else
+        {
+            pDate->Year =
+                (isNegative ? -1 : +1) * static_cast<sal_Int16>(nYear);
+            pDate->Month = static_cast<sal_uInt16>(nMonth);
+            pDate->Day = static_cast<sal_uInt16>(nDay);
+            if (bHaveTimezone)
+            {
+                if (pTimeZoneOffset)
+                {
+                    *pTimeZoneOffset = nTimezoneOffset;
+                }
+                else
+                {
+                    // a Date cannot be adjusted
+                    SAL_INFO("sax", "dropping timezone");
+                }
+            }
+            else
+            {
+                if (pTimeZoneOffset)
+                {
+                    pTimeZoneOffset->reset();
+                }
+            }
+            rbDateTime = false;
+        }
+    }
+    return bSuccess;
+}
+
+/** convert ISO "time" or "dateTime" string to util::DateTime */
+bool Converter::parseTimeOrDateTime(
+                util::DateTime & rDateTime,
+                std::u16string_view rString)
+{
+    bool dummy;
+    return lcl_parseDateTime(
+                nullptr, rDateTime, dummy, nullptr, rString, true);
+}
+
+/** convert ISO "time" or "dateTime" string to util::DateTime */
+bool Converter::parseTimeOrDateTime(
+                util::DateTime & rDateTime,
+                std::string_view rString)
+{
+    bool dummy;
+    return lcl_parseDateTime(
+                nullptr, rDateTime, dummy, nullptr, rString, true);
+}
+
+/** convert ISO "date" or "dateTime" string to util::DateTime or util::Date */
+bool Converter::parseDateOrDateTime(
+                util::Date *const pDate, util::DateTime & rDateTime,
+                bool & rbDateTime,
+                std::optional<sal_Int16> *const pTimeZoneOffset,
+                std::u16string_view rString )
+{
+    return lcl_parseDateTime(
+                pDate, rDateTime, rbDateTime, pTimeZoneOffset, rString, false);
+}
+
+/** convert ISO "date" or "dateTime" string to util::DateTime or util::Date */
+bool Converter::parseDateOrDateTime(
+                util::Date *const pDate, util::DateTime & rDateTime,
+                bool & rbDateTime,
+                std::optional<sal_Int16> *const pTimeZoneOffset,
+                std::string_view rString )
+{
+    return lcl_parseDateTime(
+                pDate, rDateTime, rbDateTime, pTimeZoneOffset, rString, false);
+}
+
+/** gets the position of the first comma after npos in the string
+    rStr. Commas inside '"' pairs are not matched */
+sal_Int32 Converter::indexOfComma( std::u16string_view rStr,
+                                            sal_Int32 nPos )
+{
+    sal_Unicode cQuote = 0;
+    sal_Int32 nLen = rStr.size();
+    for( ; nPos < nLen; nPos++ )
+    {
+        sal_Unicode c = rStr[nPos];
+        switch( c )
+        {
+        case u'\'':
+            if( 0 == cQuote )
+                cQuote = c;
+            else if( '\'' == cQuote )
+                cQuote = 0;
+            break;
+
+        case u'"':
+            if( 0 == cQuote )
+                cQuote = c;
+            else if( '\"' == cQuote )
+                cQuote = 0;
+            break;
+
+        case u',':
+            if( 0 == cQuote )
+                return nPos;
+            break;
+        }
+    }
+
+    return -1;
+}
+
+double Converter::GetConversionFactor(OUStringBuffer& rUnit, sal_Int16 nSourceUnit, sal_Int16 nTargetUnit)
+{
+    double fRetval(1.0);
+    rUnit.setLength(0);
+
+
+    if(nSourceUnit != nTargetUnit)
+    {
+        const o3tl::Length eFrom = Measure2O3tlUnit(nSourceUnit);
+        const o3tl::Length eTo = Measure2O3tlUnit(nTargetUnit);
+        fRetval = o3tl::convert(1.0, eFrom, eTo);
+
+        if (const auto sUnit = Measure2UnitString(nTargetUnit); sUnit.size() > 0)
+            rUnit.appendAscii(sUnit.data(), sUnit.size());
+    }
+
+    return fRetval;
+}
+
+double Converter::GetConversionFactor(OStringBuffer& rUnit, sal_Int16 nSourceUnit, sal_Int16 nTargetUnit)
+{
+    double fRetval(1.0);
+    rUnit.setLength(0);
+
+
+    if(nSourceUnit != nTargetUnit)
+    {
+        const o3tl::Length eFrom = Measure2O3tlUnit(nSourceUnit);
+        const o3tl::Length eTo = Measure2O3tlUnit(nTargetUnit);
+        fRetval = o3tl::convert(1.0, eFrom, eTo);
+
+        if (const auto sUnit = Measure2UnitString(nTargetUnit); sUnit.size() > 0)
+            rUnit.append(sUnit.data(), sUnit.size());
+    }
+
+    return fRetval;
+}
+
+template<typename V>
+static sal_Int16 lcl_GetUnitFromString(V rString, sal_Int16 nDefaultUnit)
+{
+    sal_Int32 nPos = 0;
+    sal_Int32 nLen = rString.size();
+    sal_Int16 nRetUnit = nDefaultUnit;
+
+    // skip white space
+    while( nPos < nLen && ' ' == rString[nPos] )
+        nPos++;
+
+    // skip negative
+    if( nPos < nLen && '-' == rString[nPos] )
+        nPos++;
+
+    // skip number
+    while( nPos < nLen && '0' <= rString[nPos] && '9' >= rString[nPos] )
+        nPos++;
+
+    if( nPos < nLen && '.' == rString[nPos] )
+    {
+        nPos++;
+        while( nPos < nLen && '0' <= rString[nPos] && '9' >= rString[nPos] )
+            nPos++;
+    }
+
+    // skip white space
+    while( nPos < nLen && ' ' == rString[nPos] )
+        nPos++;
+
+    if( nPos < nLen )
+    {
+        switch(rString[nPos])
+        {
+            case '%' :
+            {
+                nRetUnit = MeasureUnit::PERCENT;
+                break;
+            }
+            case 'c':
+            case 'C':
+            {
+                if(nPos+1 < nLen && (rString[nPos+1] == 'm'
+                    || rString[nPos+1] == 'M'))
+                    nRetUnit = MeasureUnit::CM;
+                break;
+            }
+            case 'e':
+            case 'E':
+            {
+                // CSS1_EMS or CSS1_EMX later
+                break;
+            }
+            case 'i':
+            case 'I':
+            {
+                if(nPos+1 < nLen && (rString[nPos+1] == 'n'
+                    || rString[nPos+1] == 'N'))
+                    nRetUnit = MeasureUnit::INCH;
+                break;
+            }
+            case 'm':
+            case 'M':
+            {
+                if(nPos+1 < nLen && (rString[nPos+1] == 'm'
+                    || rString[nPos+1] == 'M'))
+                    nRetUnit = MeasureUnit::MM;
+                break;
+            }
+            case 'p':
+            case 'P':
+            {
+                if(nPos+1 < nLen && (rString[nPos+1] == 't'
+                    || rString[nPos+1] == 'T'))
+                    nRetUnit = MeasureUnit::POINT;
+                if(nPos+1 < nLen && (rString[nPos+1] == 'c'
+                    || rString[nPos+1] == 'C'))
+                    nRetUnit = MeasureUnit::TWIP;
+                break;
+            }
+        }
+    }
+
+    return nRetUnit;
+}
+
+sal_Int16 Converter::GetUnitFromString(std::u16string_view rString, sal_Int16 nDefaultUnit)
+{
+    return lcl_GetUnitFromString(rString, nDefaultUnit);
+}
+sal_Int16 Converter::GetUnitFromString(std::string_view rString, sal_Int16 nDefaultUnit)
+{
+    return lcl_GetUnitFromString(rString, nDefaultUnit);
+}
+
+bool Converter::convertAny(OUStringBuffer&    rsValue,
+                           OUStringBuffer&    rsType ,
+                           const css::uno::Any& rValue)
+{
+    bool bConverted = false;
+
+    rsValue.setLength(0);
+    rsType.setLength (0);
+
+    switch (rValue.getValueTypeClass())
+    {
+        case css::uno::TypeClass_BYTE :
+        case css::uno::TypeClass_SHORT :
+        case css::uno::TypeClass_UNSIGNED_SHORT :
+        case css::uno::TypeClass_LONG :
+        case css::uno::TypeClass_UNSIGNED_LONG :
+            {
+                sal_Int32 nTempValue = 0;
+                if (rValue >>= nTempValue)
+                {
+                    rsType.append("integer");
+                    bConverted = true;
+                    rsValue.append(nTempValue);
+                }
+            }
+            break;
+
+        case css::uno::TypeClass_BOOLEAN :
+            {
+                bool bTempValue = false;
+                if (rValue >>= bTempValue)
+                {
+                    rsType.append("boolean");
+                    bConverted = true;
+                    ::sax::Converter::convertBool(rsValue, bTempValue);
+                }
+            }
+            break;
+
+        case css::uno::TypeClass_FLOAT :
+        case css::uno::TypeClass_DOUBLE :
+            {
+                double fTempValue = 0.0;
+                if (rValue >>= fTempValue)
+                {
+                    rsType.append("float");
+                    bConverted = true;
+                    ::sax::Converter::convertDouble(rsValue, fTempValue);
+                }
+            }
+            break;
+
+        case css::uno::TypeClass_STRING :
+            {
+                OUString sTempValue;
+                if (rValue >>= sTempValue)
+                {
+                    rsType.append("string");
+                    bConverted = true;
+                    rsValue.append(sTempValue);
+                }
+            }
+            break;
+
+        case css::uno::TypeClass_STRUCT :
+            {
+                css::util::Date     aDate    ;
+                css::util::Time     aTime    ;
+                css::util::DateTime aDateTime;
+
+                if (rValue >>= aDate)
+                {
+                    rsType.append("date");
+                    bConverted = true;
+                    css::util::DateTime aTempValue;
+                    aTempValue.Day              = aDate.Day;
+                    aTempValue.Month            = aDate.Month;
+                    aTempValue.Year             = aDate.Year;
+                    aTempValue.NanoSeconds = 0;
+                    aTempValue.Seconds          = 0;
+                    aTempValue.Minutes          = 0;
+                    aTempValue.Hours            = 0;
+                    ::sax::Converter::convertDateTime(rsValue, aTempValue, nullptr);
+                }
+                else
+                if (rValue >>= aTime)
+                {
+                    rsType.append("time");
+                    bConverted = true;
+                    css::util::Duration aTempValue;
+                    aTempValue.Days             = 0;
+                    aTempValue.Months           = 0;
+                    aTempValue.Years            = 0;
+                    aTempValue.NanoSeconds     = aTime.NanoSeconds;
+                    aTempValue.Seconds          = aTime.Seconds;
+                    aTempValue.Minutes          = aTime.Minutes;
+                    aTempValue.Hours            = aTime.Hours;
+                    ::sax::Converter::convertDuration(rsValue, aTempValue);
+                }
+                else
+                if (rValue >>= aDateTime)
+                {
+                    rsType.append("date");
+                    bConverted = true;
+                    ::sax::Converter::convertDateTime(rsValue, aDateTime, nullptr);
+                }
+            }
+            break;
+        default:
+            break;
+    }
+
+    return bConverted;
+}
+
+void Converter::convertBytesToHexBinary(OUStringBuffer& rBuffer, const void* pBytes,
+                                        sal_Int32 nBytes)
+{
+    rBuffer.setLength(0);
+    rBuffer.ensureCapacity(nBytes * 2);
+    auto pChars = static_cast<const unsigned char*>(pBytes);
+    for (sal_Int32 i = 0; i < nBytes; ++i)
+    {
+        sal_Int32 c = *pChars++;
+        if (c < 16)
+            rBuffer.append('0');
+        rBuffer.append(c, 16);
+    }
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */