void resumeAt ( PRUint64 startPos , ACString entityID )

Prepare this channel for resuming. The request will not start until asyncOpen or open is called. Calling resumeAt after open or asyncOpen has been called has undefined behaviour.

During OnStartRequest, this channel will have a status of NS_ERROR_NOT_RESUMABLE if the file cannot be resumed, eg because the server doesn't support this. This error may occur even if startPos is 0, so that the front end can warn the user. Similarly, the status of this channel during OnStartRequest may be NS_ERROR_ENTITY_CHANGED, which indicates that the entity has changed, as indicated by a changed entityID. In both of these cases, no OnDataAvailable will be called, and OnStopRequest will immediately follow with the same status code.

Arguments:

startPos: the starting offset, in bytes, to use to download

entityID: information about the file, to match before obtaining the file. Pass an empty string to use anything.