Testing rtf before parsing

Is there some hidden method of checking is RTF is valid before parsing it? I am running into issues with flooding my error handler with notices, as my third party RTF provider (an old system) is handing over badly formatted RTF.

It would be great if I could to something like this

$document = new Document();
if ($document->valid($rtf)) {
    $parsed = $document->Parse($rtf);
}

Also it would be nice if Document didn't both trigger a trigger_error as well throw an exception. This will hand off the error twice to my error handler (well only once if I catch it). An exception should be enough I would imagine? :)

Start by locating the Document class and tracing its Parse method, including where parsing errors are reported and exceptions are thrown. Determine how invalid RTF is currently handled and whether a validation entry point can be defined. Done means malformed input can be checked before parsing and error handling does not report the same failure twice.