Restrict search for OFF header to first 3 bytes

code/OFFLoader.cpp

@@ -94,7 +94,7 @@ bool OFFImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool
     {
         if (!pIOHandler)return true;
         const char* tokens[] = {"off"};
-        return SearchFileHeaderForToken(pIOHandler,pFile,tokens,1);
+        return SearchFileHeaderForToken(pIOHandler,pFile,tokens,1,3);
     }
     return false;
 }