Address compression related memory handling. #164
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Specifically: `open` now checks the stream status before potentially opening again (and leaking memory). `close` now checks stream status before attempting to close (potentially closing an already closed stream). Also an autoreleasepool now wraps the NSData object creation. Since `close` may be called in tight loops, this correctly releases memory in a timely manner. `write:maxLength:` now is wrapped in an autoreleasepool. Since this is called in tight loops, the creation of the `outputBuffer` was causing memory to grow as a compresion was underway. The autoreleasepool mitigates this situation.
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Specifically:
opennow checks the stream status before potentially opening again (and leaking memory).closenow checks stream status before attempting to close (potentially closing an already closed stream). Also an autoreleasepool now wraps the NSData object creation. Sinceclosemay be called in tight loops, this correctly releases memory in a timely manner.write:maxLength:now is wrapped in an autoreleasepool. Since this is called in tight loops, the creation of theoutputBufferwas causing memory to grow as a compresion was underway. The autoreleasepool mitigates this situation.