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r" c C sB t j | d d } | d k r> | j t j d | S| S)aS Encode a byte string using Base64.
s is the byte string to encode. Optional altchars must be a byte
string of length 2 which specifies an alternative alphabet for the
'+' and '/' characters. This allows an application to
e.g. generate url or filesystem safe Base64 strings.
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b2a_base64 translatebytes maketrans)r altcharsencodedr r r! r 3 s Fc C sz t | } | d k rB t | } | j t j | d } n | rm t j d | rm t j d n t j | S)a Decode a Base64 encoded byte string.
s is the byte string to decode. Optional altchars must be a
string of length 2 which specifies the alternative alphabet used
instead of the '+' and '/' characters.
The decoded string is returned. A binascii.Error is raised if s is
incorrectly padded.
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discarded prior to the padding check. If validate is True,
non-base64-alphabet characters in the input result in a binascii.Error.
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t | S)a Decode a byte string encoded with the standard Base64 alphabet.
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)r r' _urlsafe_encode_translation)r r r r! r r s c C s% t | } | j t } t | S)aX Decode a byte string encoded with the standard Base64 alphabet.
s is the byte string to decode. The decoded byte string is
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