mirror of https://github.com/python/cpython
95 lines
2.5 KiB
Python
95 lines
2.5 KiB
Python
# Copyright (C) 2001,2002 Python Software Foundation
|
||
# Author: barry@zope.com (Barry Warsaw)
|
||
|
||
"""Module containing encoding functions for Image.Image and Text.Text.
|
||
"""
|
||
|
||
import base64
|
||
|
||
|
||
|
||
# Helpers
|
||
try:
|
||
from quopri import encodestring as _encodestring
|
||
|
||
def _qencode(s):
|
||
enc = _encodestring(s, quotetabs=1)
|
||
# Must encode spaces, which quopri.encodestring() doesn't do
|
||
return enc.replace(' ', '=20')
|
||
except ImportError:
|
||
# Python 2.1 doesn't have quopri.encodestring()
|
||
from cStringIO import StringIO
|
||
import quopri as _quopri
|
||
|
||
def _qencode(s):
|
||
if not s:
|
||
return s
|
||
hasnewline = (s[-1] == '\n')
|
||
infp = StringIO(s)
|
||
outfp = StringIO()
|
||
_quopri.encode(infp, outfp, quotetabs=1)
|
||
# Python 2.x's encode() doesn't encode spaces even when quotetabs==1
|
||
value = outfp.getvalue().replace(' ', '=20')
|
||
if not hasnewline and value[-1] == '\n':
|
||
return value[:-1]
|
||
return value
|
||
|
||
|
||
def _bencode(s):
|
||
# We can't quite use base64.encodestring() since it tacks on a "courtesy
|
||
# newline". Blech!
|
||
if not s:
|
||
return s
|
||
hasnewline = (s[-1] == '\n')
|
||
value = base64.encodestring(s)
|
||
if not hasnewline and value[-1] == '\n':
|
||
return value[:-1]
|
||
return value
|
||
|
||
|
||
|
||
def encode_base64(msg):
|
||
"""Encode the message's payload in Base64.
|
||
|
||
Also, add an appropriate Content-Transfer-Encoding header.
|
||
"""
|
||
orig = msg.get_payload()
|
||
encdata = _bencode(orig)
|
||
msg.set_payload(encdata)
|
||
msg['Content-Transfer-Encoding'] = 'base64'
|
||
|
||
|
||
|
||
def encode_quopri(msg):
|
||
"""Encode the message's payload in quoted-printable.
|
||
|
||
Also, add an appropriate Content-Transfer-Encoding header.
|
||
"""
|
||
orig = msg.get_payload()
|
||
encdata = _qencode(orig)
|
||
msg.set_payload(encdata)
|
||
msg['Content-Transfer-Encoding'] = 'quoted-printable'
|
||
|
||
|
||
|
||
def encode_7or8bit(msg):
|
||
"""Set the Content-Transfer-Encoding header to 7bit or 8bit."""
|
||
orig = msg.get_payload()
|
||
if orig is None:
|
||
# There's no payload. For backwards compatibility we use 7bit
|
||
msg['Content-Transfer-Encoding'] = '7bit'
|
||
return
|
||
# We play a trick to make this go fast. If encoding to ASCII succeeds, we
|
||
# know the data must be 7bit, otherwise treat it as 8bit.
|
||
try:
|
||
orig.encode('ascii')
|
||
except UnicodeError:
|
||
msg['Content-Transfer-Encoding'] = '8bit'
|
||
else:
|
||
msg['Content-Transfer-Encoding'] = '7bit'
|
||
|
||
|
||
|
||
def encode_noop(msg):
|
||
"""Do nothing."""
|