File URL To Chrome/Resource URL

Hello all,

I'm working on an extension to link Venkman to Komodo with the aim of  
providing local and remote debugging of XULRunner applications. Small  
question...

nsIChromeRegistry::convertChromeURL and nsIResProtocolHandler::resolveURI  
provide a convenient way of getting a local file path from chrome:* and  
registry:* URIs. Anyone know of an equally easy way of doing the opposite?

That is, finding the first chrome: or resource: URI resolving to a  
particular local file: URI?

I'm currently painfully walking through the ChromeML directory service,  
reading manifests from disk, parsing them, then doing regex trickery to  
construct a dictionary of file URIs to compare to but I'm sure someone  
must have already found an easier way deep in the Mozilla code.

Thanks in advance.

- Edmond -

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