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diff --git a/svtools/source/svrtf/rtfout.cxx b/svtools/source/svrtf/rtfout.cxx
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+/* -*- 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 <tools/debug.hxx>
+#include <tools/stream.hxx>
+#include <tools/solar.h>
+#include <rtl/string.hxx>
+#include <svtools/rtfkeywd.hxx>
+#include <svtools/rtfout.hxx>
+
+namespace {
+
+SvStream& Out_Hex( SvStream& rStream, sal_uLong nHex, sal_uInt8 nLen )
+{
+ char aNToABuf[] = "0000000000000000";
+
+ DBG_ASSERT( nLen < sizeof(aNToABuf), "too many places" );
+ if( nLen >= sizeof(aNToABuf) )
+ nLen = (sizeof(aNToABuf)-1);
+
+ // set pointer to end of buffer
+ char* pStr = aNToABuf + (sizeof(aNToABuf)-1);
+ for( sal_uInt8 n = 0; n < nLen; ++n )
+ {
+ *(--pStr) = static_cast<char>(nHex & 0xf ) + 48;
+ if( *pStr > '9' )
+ *pStr += 39;
+ nHex >>= 4;
+ }
+ return rStream.WriteOString( pStr );
+}
+
+// Ideally, this function should work on (sal_uInt32) Unicode scalar values
+// instead of (sal_Unicode) UTF-16 code units. However, at least "Rich Text
+// Format (RTF) Specification Version 1.9.1" available at
+// <https://www.microsoft.com/en-us/download/details.aspx?id=10725> does not
+// look like it allows non-BMP Unicode characters >= 0x10000 in the \uN notation
+// (it only talks about "Unicode character", but then explains how values of N
+// greater than 32767 will be expressed as negative signed 16-bit numbers, so
+// that smells like \uN is limited to BMP).
+// However the "Mathematics" section has an example that shows the code point
+// U+1D44E being encoded as UTF-16 surrogate pair "\u-10187?\u-9138?", so
+// sal_Unicode actually works fine here.
+SvStream& Out_Char(SvStream& rStream, sal_Unicode c,
+ int *pUCMode, rtl_TextEncoding eDestEnc)
+{
+ const char* pStr = nullptr;
+ switch (c)
+ {
+ case 0x1:
+ case 0x2:
+ // this are control character of our textattributes and will never be
+ // written
+ break;
+ case 0xA0:
+ rStream.WriteOString( "\\~" );
+ break;
+ case 0xAD:
+ rStream.WriteOString( "\\-" );
+ break;
+ case 0x2011:
+ rStream.WriteOString( "\\_" );
+ break;
+ case '\n':
+ pStr = OOO_STRING_SVTOOLS_RTF_LINE;
+ break;
+ case '\t':
+ pStr = OOO_STRING_SVTOOLS_RTF_TAB;
+ break;
+ default:
+ switch(c)
+ {
+ case 149:
+ pStr = OOO_STRING_SVTOOLS_RTF_BULLET;
+ break;
+ case 150:
+ pStr = OOO_STRING_SVTOOLS_RTF_ENDASH;
+ break;
+ case 151:
+ pStr = OOO_STRING_SVTOOLS_RTF_EMDASH;
+ break;
+ case 145:
+ pStr = OOO_STRING_SVTOOLS_RTF_LQUOTE;
+ break;
+ case 146:
+ pStr = OOO_STRING_SVTOOLS_RTF_RQUOTE;
+ break;
+ case 147:
+ pStr = OOO_STRING_SVTOOLS_RTF_LDBLQUOTE;
+ break;
+ case 148:
+ pStr = OOO_STRING_SVTOOLS_RTF_RDBLQUOTE;
+ break;
+ }
+
+ if (pStr)
+ break;
+
+ switch (c)
+ {
+ case '\\':
+ case '}':
+ case '{':
+ rStream.WriteChar( '\\' ).WriteChar( char(c) );
+ break;
+ default:
+ if (c >= ' ' && c <= '~')
+ rStream.WriteChar( char(c) );
+ else
+ {
+ //If we can't convert to the dest encoding, or if
+ //it's an uncommon multibyte sequence which most
+ //readers won't be able to handle correctly, then
+ //export as unicode
+ OUString sBuf(&c, 1);
+ OString sConverted;
+ sal_uInt32 const nFlags =
+ RTL_UNICODETOTEXT_FLAGS_UNDEFINED_ERROR |
+ RTL_UNICODETOTEXT_FLAGS_INVALID_ERROR;
+ bool bWriteAsUnicode = !(sBuf.convertToString(&sConverted,
+ eDestEnc, nFlags))
+ || (RTL_TEXTENCODING_UTF8==eDestEnc); // #i43933# do not export UTF-8 chars in RTF;
+ if (bWriteAsUnicode)
+ {
+ (void)sBuf.convertToString(&sConverted,
+ eDestEnc, OUSTRING_TO_OSTRING_CVTFLAGS);
+ }
+ const sal_Int32 nLen = sConverted.getLength();
+
+ if (bWriteAsUnicode && pUCMode)
+ {
+ // then write as unicode - character
+ if (*pUCMode != nLen)
+ {
+ // #i47831# add an additional whitespace, so that
+ // "document whitespaces" are not ignored.;
+ rStream.WriteOString( "\\uc" )
+ .WriteNumberAsString( nLen ).WriteOString( " " );
+ *pUCMode = nLen;
+ }
+ rStream.WriteOString( "\\u" )
+ .WriteNumberAsString(c);
+ }
+
+ for (sal_Int32 nI = 0; nI < nLen; ++nI)
+ {
+ rStream.WriteOString( "\\'" );
+ Out_Hex(rStream, sConverted[nI], 2);
+ }
+ }
+ break;
+ }
+ break;
+ }
+
+ if (pStr)
+ rStream.WriteOString( pStr ).WriteChar( ' ' );
+
+ return rStream;
+}
+
+}
+
+SvStream& RTFOutFuncs::Out_String( SvStream& rStream, std::u16string_view rStr,
+ rtl_TextEncoding eDestEnc)
+{
+ int nUCMode = 1;
+ for (size_t n = 0; n < rStr.size(); ++n)
+ Out_Char(rStream, rStr[n], &nUCMode, eDestEnc);
+ if (nUCMode != 1)
+ rStream.WriteOString( "\\uc1" ).WriteOString( " " ); // #i47831# add an additional whitespace, so that "document whitespaces" are not ignored.;
+ return rStream;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */