let mathtype import take a SvStream of the contents

Change-Id: I3c02dbee53554aa644b78f8a425b6a4333f2b95d
Reviewed-on: https://gerrit.libreoffice.org/45729Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

starmath/source/mathtype.cxx

@@ -564,7 +564,12 @@ bool MathType::Parse(SotStorage *pStor)
         StreamMode::STD_READ);
     if ( (!xSrc.is()) || (ERRCODE_NONE != xSrc->GetError()))
         return false;
-    pS = xSrc.get();
+    return Parse(xSrc.get());
+}
+
+bool MathType::Parse(SvStream* pStream)
+{
+    pS = pStream;
     pS->SetEndian( SvStreamEndian::LITTLE );
 
     EQNOLEFILEHDR aHdr;

starmath/source/mathtype.hxx

@@ -97,7 +97,8 @@ public:
         Init();
     }
 
-    bool Parse( SotStorage* pStor );
+    bool Parse(SotStorage* pStor);
+    bool Parse(SvStream* pStor);
     bool ConvertFromStarMath( SfxMedium& rMedium );
 
 private: