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Zoltán Papp
861e0d5609
Android cannot address the user's shared storage by path, so a received file had to land in app-private storage and be copied out afterwards, needing twice the space of the transfer. Put the staging area behind a Sink interface the receiver writes every payload through. The filesystem spool implements it unchanged and stays the default; a platform that cannot be addressed by path implements the gomobile-bound half instead and stages payloads wherever it can reach. The writer reports its own total rather than returning a written count: gomobile copies a []byte argument into a fresh Java array and carries no count back out. A failed delivery now drops the staged payloads. The filesystem spool swept them up on its next pass, but a sink holding entries the engine cannot address by path has no such fallback.