kopia lustrzana https://github.com/micropython/micropython-lib
75 wiersze
2.1 KiB
Python
75 wiersze
2.1 KiB
Python
# Copyright (C) 2001-2006 Python Software Foundation
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# Author: Barry Warsaw
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# Contact: email-sig@python.org
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"""Encodings and related functions."""
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__all__ = [
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"encode_7or8bit",
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"encode_base64",
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"encode_noop",
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"encode_quopri",
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]
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from base64 import encodebytes as _bencode
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from quopri import encodestring as _encodestring
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def _qencode(s):
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enc = _encodestring(s, quotetabs=True)
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# Must encode spaces, which quopri.encodestring() doesn't do
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return enc.replace(b" ", b"=20")
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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(decode=True)
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encdata = str(_bencode(orig), "ascii")
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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(decode=True)
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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(decode=True)
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if orig is None:
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# There's no payload. For backwards compatibility we use 7bit
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msg["Content-Transfer-Encoding"] = "7bit"
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return
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# We play a trick to make this go fast. If encoding/decode to ASCII
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# succeeds, we know the data must be 7bit, otherwise treat it as 8bit.
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try:
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if isinstance(orig, str):
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orig.encode("ascii")
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else:
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orig.decode("ascii")
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except UnicodeError:
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charset = msg.get_charset()
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output_cset = charset and charset.output_charset
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# iso-2022-* is non-ASCII but encodes to a 7-bit representation
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if output_cset and output_cset.lower().startswith("iso-2022-"):
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msg["Content-Transfer-Encoding"] = "7bit"
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else:
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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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