David Aurelio c33084cc94 Read within bounds of NSData object
Summary: This prevents the `isUnbundle` check to read beyond the end of an `NSData` instance by using `getBytes:length:` instead of accessing the underlying buffer directly.

Reviewed By: javache

Differential Revision: D3548874

fbshipit-source-id: 7c93c66cc6abb4a2a321888ab394212f4d14a03e
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