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Python Compiled Bytecode | 2009-11-11 | 5KB | 154 lines

# Source Generated with Decompyle++
# File: in.pyc (Python 2.6)

"""Base64 content transfer encoding per RFCs 2045-2047.

This module handles the content transfer encoding method defined in RFC 2045
to encode arbitrary 8-bit data using the three 8-bit bytes in four 7-bit
characters encoding known as Base64.

It is used in the MIME standards for email to attach images, audio, and text
using some 8-bit character sets to messages.

This module provides an interface to encode and decode both headers and bodies
with Base64 encoding.

RFC 2045 defines a method for including character set information in an
`encoded-word' in a header.  This method is commonly used for 8-bit real names
in To:, From:, Cc:, etc. fields, as well as Subject: lines.

This module does not do the line wrapping or end-of-line character conversion
necessary for proper internationalized headers; it only does dumb encoding and
decoding.  To deal with the various line wrapping issues, use the email.header
module.
"""
__all__ = [
    'base64_len',
    'body_decode',
    'body_encode',
    'decode',
    'decodestring',
    'encode',
    'encodestring',
    'header_encode']
from binascii import b2a_base64, a2b_base64
from email.utils import fix_eols
CRLF = '\r\n'
NL = '\n'
EMPTYSTRING = ''
MISC_LEN = 7

def base64_len(s):
    '''Return the length of s when it is encoded with base64.'''
    (groups_of_3, leftover) = divmod(len(s), 3)
    n = groups_of_3 * 4
    if leftover:
        n += 4

    return n


def header_encode(header, charset = 'iso-8859-1', keep_eols = False, maxlinelen = 76, eol = NL):
    '''Encode a single header line with Base64 encoding in a given charset.

    Defined in RFC 2045, this Base64 encoding is identical to normal Base64
    encoding, except that each line must be intelligently wrapped (respecting
    the Base64 encoding), and subsequent lines must start with a space.

    charset names the character set to use to encode the header.  It defaults
    to iso-8859-1.

    End-of-line characters (\\r, \\n, \\r\\n) will be automatically converted
    to the canonical email line separator \\r\\n unless the keep_eols
    parameter is True (the default is False).

    Each line of the header will be terminated in the value of eol, which
    defaults to "\\n".  Set this to "\\r\\n" if you are using the result of
    this function directly in email.

    The resulting string will be in the form:

    "=?charset?b?WW/5ciBtYXp66XLrIHf8eiBhIGhhbXBzdGHuciBBIFlv+XIgbWF6euly?=\\n
      =?charset?b?6yB3/HogYSBoYW1wc3Rh7nIgQkMgWW/5ciBtYXp66XLrIHf8eiBhIGhh?="

    with each line wrapped at, at most, maxlinelen characters (defaults to 76
    characters).
    '''
    if not header:
        return header
    if not keep_eols:
        header = fix_eols(header)

    base64ed = []
    max_encoded = maxlinelen - len(charset) - MISC_LEN
    max_unencoded = max_encoded * 3 // 4
    for i in range(0, len(header), max_unencoded):
        base64ed.append(b2a_base64(header[i:i + max_unencoded]))

    lines = []
    for line in base64ed:
        if line.endswith(NL):
            line = line[:-1]

        lines.append('=?%s?b?%s?=' % (charset, line))

    joiner = eol + ' '
    return joiner.join(lines)


def encode(s, binary = True, maxlinelen = 76, eol = NL):
    '''Encode a string with base64.

    Each line will be wrapped at, at most, maxlinelen characters (defaults to
    76 characters).

    If binary is False, end-of-line characters will be converted to the
    canonical email end-of-line sequence \\r\\n.  Otherwise they will be left
    verbatim (this is the default).

    Each line of encoded text will end with eol, which defaults to "\\n".  Set
    this to "\r
" if you will be using the result of this function directly
    in an email.
    '''
    if not s:
        return s
    if not binary:
        s = fix_eols(s)

    encvec = []
    max_unencoded = maxlinelen * 3 // 4
    for i in range(0, len(s), max_unencoded):
        enc = b2a_base64(s[i:i + max_unencoded])
        if enc.endswith(NL) and eol != NL:
            enc = enc[:-1] + eol

        encvec.append(enc)

    return EMPTYSTRING.join(encvec)

body_encode = encode
encodestring = encode

def decode(s, convert_eols = None):
    '''Decode a raw base64 string.

    If convert_eols is set to a string value, all canonical email linefeeds,
    e.g. "\\r\\n", in the decoded text will be converted to the value of
    convert_eols.  os.linesep is a good choice for convert_eols if you are
    decoding a text attachment.

    This function does not parse a full MIME header value encoded with
    base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
    level email.header class for that functionality.
    '''
    if not s:
        return s
    dec = a2b_base64(s)
    if convert_eols:
        return dec.replace(CRLF, convert_eols)
    return dec

body_decode = decode
decodestring = decode