Don't pessimize to RTL_TEXTENCODING_DONTKNOW

...when aTextEncodingOrg can't represent all chars, but getBestMSEncodingByChar
doesn't know any better encoding, either.  (This happened during
CppunitTest_sw_rtfexport, where it caused OUStringToOString to be called with
RTL_TEXTENCODING_DONTKNOW from WMFWriter::WMFRecord_Escape_Unicode.)

Change-Id: Ia975a2907f519172e7da4a370d97e1f4317b78b3

1 files changed, 6 insertions, 0 deletions

diff --git a/vcl/source/filter/wmf/wmfwr.cxx b/vcl/source/filter/wmf/wmfwr.cxx
index 51c7a6807bb5..2e35ebd26ea4 100644
--- a/vcl/source/filter/wmf/wmfwr.cxx
+++ b/vcl/source/filter/wmf/wmfwr.cxx
@@ -469,12 +469,18 @@ bool WMFWriter::WMFRecord_Escape_Unicode( const Point& rPoint, const OUString& r
                 pBuf = rUniStr.getStr();
                 const sal_Unicode* pCheckChar = pBuf;
                 rtl_TextEncoding aTextEncoding = getBestMSEncodingByChar(*pCheckChar); // try the first character
+                if (aTextEncoding == RTL_TEXTENCODING_DONTKNOW) {
+                    aTextEncoding = aTextEncodingOrg;
+                }
                 for ( i = 1; i < nStringLen; i++)
                 {
                     if (aTextEncoding != aTextEncodingOrg) // found something
                         break;
                     pCheckChar++;
                     aTextEncoding = getBestMSEncodingByChar(*pCheckChar); // try the next character
+                    if (aTextEncoding == RTL_TEXTENCODING_DONTKNOW) {
+                        aTextEncoding = aTextEncodingOrg;
+                    }
                 }
 
                 aByteStr = OUStringToOString(rUniStr,  aTextEncoding);