70 lines
1.6 KiB
Python
70 lines
1.6 KiB
Python
# Copyright (C) 2001 Python Software Foundation
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# Author: barry@zope.com (Barry Warsaw)
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"""Module containing encoding functions for Image.Image and Text.Text.
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"""
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import base64
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from quopri import encodestring as _encodestring
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# Helpers
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def _qencode(s):
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return _encodestring(s, quotetabs=1)
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def _bencode(s):
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# We can't quite use base64.encodestring() since it tacks on a "courtesy
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# newline". Blech!
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if not s:
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return s
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hasnewline = (s[-1] == '\n')
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value = base64.encodestring(s)
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if not hasnewline and value[-1] == '\n':
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return value[:-1]
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return value
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def encode_base64(msg):
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"""Encode the message's payload in Base64.
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Also, add an appropriate Content-Transfer-Encoding: header.
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"""
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orig = msg.get_payload()
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encdata = _bencode(orig)
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msg.set_payload(encdata)
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msg['Content-Transfer-Encoding'] = 'base64'
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def encode_quopri(msg):
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"""Encode the message's payload in Quoted-Printable.
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Also, add an appropriate Content-Transfer-Encoding: header.
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"""
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orig = msg.get_payload()
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encdata = _qencode(orig)
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msg.set_payload(encdata)
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msg['Content-Transfer-Encoding'] = 'quoted-printable'
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def encode_7or8bit(msg):
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"""Set the Content-Transfer-Encoding: header to 7bit or 8bit."""
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orig = msg.get_payload()
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# We play a trick to make this go fast. If encoding to ASCII succeeds, we
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# know the data must be 7bit, otherwise treat it as 8bit.
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try:
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orig.encode('ascii')
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except UnicodeError:
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msg['Content-Transfer-Encoding'] = '8bit'
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else:
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msg['Content-Transfer-Encoding'] = '7bit'
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def encode_noop(msg):
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"""Do nothing."""
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