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d � Z d � Z d � Z d � Z e d k r� e � n d S( sH Conversions to/from quoted-printable transport encoding as per RFC 1521.t encodet decodet encodestringt decodestringt =iL t 0123456789ABCDEFt i����( t a2b_qpt b2a_qpc C sG | d k r | S| d k r | S| t k pF d | k oC d k n S( s� Decide whether a particular character needs to be quoted.
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s� Read 'input', apply quoted-printable encoding, and write to 'output'.
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RFC 1521.
The 'header' flag indicates whether we are encoding spaces as _ as per
RFC 1522.
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