tdf#131951 related, improve perf

similar to
    commit 9429dacc7ff93f99dd84532357020669df33a0c5
    tdf#131951: automatically increase buffer size
in a few places, let the OUStringBuffer handle large tokens,
it has faster handling than repeatedly appending to an OUString

Change-Id: I609b84b36e817fbcd6d366c53cd2e8b865216712
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/92503
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Signed-off-by: Xisco Fauli <xiscofauli@libreoffice.org>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/92648
diff --git a/svtools/source/svhtml/parhtml.cxx b/svtools/source/svhtml/parhtml.cxx
index 3f50197e..67f5a87 100644
--- a/svtools/source/svhtml/parhtml.cxx
+++ b/svtools/source/svhtml/parhtml.cxx
@@ -925,12 +925,6 @@
                while( '-' == nNextCh && IsParserWorking() )
                {
                    bTwoMinus = true;

                    if( MAX_LEN == sTmpBuffer.getLength() )
                    {
                        aToken += sTmpBuffer;
                        sTmpBuffer.setLength(0);
                    }
                    sTmpBuffer.appendUtf32( nNextCh );
                    nNextCh = GetNextChar();
                }
@@ -983,8 +977,7 @@
            break;
        }

        if( (!bContinue && !sTmpBuffer.isEmpty()) ||
            MAX_LEN == sTmpBuffer.getLength() )
        if( !bContinue && !sTmpBuffer.isEmpty() )
        {
            aToken += sTmpBuffer;
            sTmpBuffer.setLength(0);
@@ -1063,11 +1056,6 @@
                    OUStringBuffer sTmpBuffer;
                    do {
                        sTmpBuffer.appendUtf32( nNextCh );
                        if( MAX_LEN == sTmpBuffer.getLength() )
                        {
                            aToken += sTmpBuffer;
                            sTmpBuffer.setLength(0);
                        }
                        nNextCh = GetNextChar();
                    } while( '>' != nNextCh && '/' != nNextCh && !rtl::isAsciiWhiteSpace( nNextCh ) &&
                             IsParserWorking() && !rInput.eof() );
diff --git a/svtools/source/svrtf/parrtf.cxx b/svtools/source/svrtf/parrtf.cxx
index 349ca2e..a7e3f64 100644
--- a/svtools/source/svrtf/parrtf.cxx
+++ b/svtools/source/svrtf/parrtf.cxx
@@ -98,22 +98,12 @@
                    {
                        aToken = "\\";
                        {
                            OUStringBuffer aStrBuffer;
                            aStrBuffer.setLength( MAX_TOKEN_LEN );
                            sal_Int32 nStrLen = 0;
                            OUStringBuffer aStrBuffer( MAX_TOKEN_LEN );
                            do {
                                aStrBuffer[nStrLen++] = nNextCh;
                                if( MAX_TOKEN_LEN == nStrLen )
                                {
                                    aToken += aStrBuffer;
                                    nStrLen = 0;
                                }
                                aStrBuffer.appendUtf32(nNextCh);
                                nNextCh = GetNextChar();
                            } while( RTF_ISALPHA( nNextCh ) );
                            if( nStrLen )
                            {
                                aToken += aStrBuffer;
                            }
                            aToken += aStrBuffer;
                        }

                        // minus before numeric parameters