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# Copyright (C) 2001-2006 Python Software Foundation 

# Author: Barry Warsaw 

# Contact: email-sig@python.org 

 

"""Encodings and related functions.""" 

 

__all__ = [ 

    'encode_7or8bit', 

    'encode_base64', 

    'encode_noop', 

    'encode_quopri', 

    ] 

 

import base64 

 

from quopri import encodestring as _encodestring 

 

 

 

def _qencode(s): 

    enc = _encodestring(s, quotetabs=True) 

    # Must encode spaces, which quopri.encodestring() doesn't do 

    return enc.replace(' ', '=20') 

 

 

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."""