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authoryum <yum.food.vr@gmail.com>2023-01-01 21:05:27 -0800
committeryum <yum.food.vr@gmail.com>2023-01-01 21:44:45 -0800
commite25bdba3a3a53b09be5269d8b065c13b73ab55c3 (patch)
tree1d1dc1d94cde92c2f4f8ce86017395054787515d /Python/Dependencies/future-0.18.2/src/future/backports/email/base64mime.py
parent0d408cc812a094a708edbe4baf536e928731cfc3 (diff)
Embed git in package
package.ps1 fetches PortableGit and embeds it in the package. This eliminates all but one runtime dependency (MSVC++ Redistributable). * Move Python into a new FOSS folder.
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-# Copyright (C) 2002-2007 Python Software Foundation
-# Author: Ben Gertzfield
-# Contact: email-sig@python.org
-
-"""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.
-"""
-from __future__ import unicode_literals
-from __future__ import division
-from __future__ import absolute_import
-from future.builtins import range
-from future.builtins import bytes
-
-__all__ = [
- 'body_decode',
- 'body_encode',
- 'decode',
- 'decodestring',
- 'header_encode',
- 'header_length',
- ]
-
-
-from base64 import b64encode
-from binascii import b2a_base64, a2b_base64
-
-CRLF = '\r\n'
-NL = '\n'
-EMPTYSTRING = ''
-
-# See also Charset.py
-MISC_LEN = 7
-
-
-# Helpers
-def header_length(bytearray):
- """Return the length of s when it is encoded with base64."""
- groups_of_3, leftover = divmod(len(bytearray), 3)
- # 4 bytes out for each 3 bytes (or nonzero fraction thereof) in.
- n = groups_of_3 * 4
- if leftover:
- n += 4
- return n
-
-
-def header_encode(header_bytes, charset='iso-8859-1'):
- """Encode a single header line with Base64 encoding in a given charset.
-
- charset names the character set to use to encode the header. It defaults
- to iso-8859-1. Base64 encoding is defined in RFC 2045.
- """
- if not header_bytes:
- return ""
- if isinstance(header_bytes, str):
- header_bytes = header_bytes.encode(charset)
- encoded = b64encode(header_bytes).decode("ascii")
- return '=?%s?b?%s?=' % (charset, encoded)
-
-
-def body_encode(s, maxlinelen=76, eol=NL):
- r"""Encode a string with base64.
-
- Each line will be wrapped at, at most, maxlinelen characters (defaults to
- 76 characters).
-
- Each line of encoded text will end with eol, which defaults to "\n". Set
- this to "\r\n" if you will be using the result of this function directly
- in an email.
- """
- if not s:
- return s
-
- encvec = []
- max_unencoded = maxlinelen * 3 // 4
- for i in range(0, len(s), max_unencoded):
- # BAW: should encode() inherit b2a_base64()'s dubious behavior in
- # adding a newline to the encoded string?
- enc = b2a_base64(s[i:i + max_unencoded]).decode("ascii")
- if enc.endswith(NL) and eol != NL:
- enc = enc[:-1] + eol
- encvec.append(enc)
- return EMPTYSTRING.join(encvec)
-
-
-def decode(string):
- """Decode a raw base64 string, returning a bytes object.
-
- 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 string:
- return bytes()
- elif isinstance(string, str):
- return a2b_base64(string.encode('raw-unicode-escape'))
- else:
- return a2b_base64(string)
-
-
-# For convenience and backwards compatibility w/ standard base64 module
-body_decode = decode
-decodestring = decode