Do not decrypt XRef streams and "Encrypt" dictionary #214
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According to spec, XRefs and "Encrypt" dictionary should never be decrypted.
Currently, the library attempts to decrypt them if trying to iterate over all objects in PDF, as described in #205.
This change records a reference to "Encrypt" dictionary in
Decryptedmap, so it won't be passed to decryption routine.It also checks the
Typefield ofPdfObjectStreamand skips decryption if it's anXRefstream.PR also includes a small refactoring for Encrypt and Decrypt function.