mirror of
https://github.com/python/cpython.git
synced 2025-10-31 05:31:20 +00:00
99 lines
2.7 KiB
Python
99 lines
2.7 KiB
Python
"""Python 'uu_codec' Codec - UU content transfer encoding.
|
|
|
|
This codec de/encodes from bytes to bytes.
|
|
|
|
Written by Marc-Andre Lemburg (mal@lemburg.com). Some details were
|
|
adapted from uu.py which was written by Lance Ellinghouse and
|
|
modified by Jack Jansen and Fredrik Lundh.
|
|
"""
|
|
|
|
import codecs
|
|
import binascii
|
|
from io import BytesIO
|
|
|
|
### Codec APIs
|
|
|
|
def uu_encode(input, errors='strict', filename='<data>', mode=0o666):
|
|
assert errors == 'strict'
|
|
infile = BytesIO(input)
|
|
outfile = BytesIO()
|
|
read = infile.read
|
|
write = outfile.write
|
|
|
|
# Encode
|
|
write(('begin %o %s\n' % (mode & 0o777, filename)).encode('ascii'))
|
|
chunk = read(45)
|
|
while chunk:
|
|
write(binascii.b2a_uu(chunk))
|
|
chunk = read(45)
|
|
write(b' \nend\n')
|
|
|
|
return (outfile.getvalue(), len(input))
|
|
|
|
def uu_decode(input, errors='strict'):
|
|
assert errors == 'strict'
|
|
infile = BytesIO(input)
|
|
outfile = BytesIO()
|
|
readline = infile.readline
|
|
write = outfile.write
|
|
|
|
# Find start of encoded data
|
|
while 1:
|
|
s = readline()
|
|
if not s:
|
|
raise ValueError('Missing "begin" line in input data')
|
|
if s[:5] == b'begin':
|
|
break
|
|
|
|
# Decode
|
|
while True:
|
|
s = readline()
|
|
if not s or s == b'end\n':
|
|
break
|
|
try:
|
|
data = binascii.a2b_uu(s)
|
|
except binascii.Error as v:
|
|
# Workaround for broken uuencoders by /Fredrik Lundh
|
|
nbytes = (((s[0]-32) & 63) * 4 + 5) // 3
|
|
data = binascii.a2b_uu(s[:nbytes])
|
|
#sys.stderr.write("Warning: %s\n" % str(v))
|
|
write(data)
|
|
if not s:
|
|
raise ValueError('Truncated input data')
|
|
|
|
return (outfile.getvalue(), len(input))
|
|
|
|
class Codec(codecs.Codec):
|
|
def encode(self, input, errors='strict'):
|
|
return uu_encode(input, errors)
|
|
|
|
def decode(self, input, errors='strict'):
|
|
return uu_decode(input, errors)
|
|
|
|
class IncrementalEncoder(codecs.IncrementalEncoder):
|
|
def encode(self, input, final=False):
|
|
return uu_encode(input, self.errors)[0]
|
|
|
|
class IncrementalDecoder(codecs.IncrementalDecoder):
|
|
def decode(self, input, final=False):
|
|
return uu_decode(input, self.errors)[0]
|
|
|
|
class StreamWriter(Codec, codecs.StreamWriter):
|
|
charbuffertype = bytes
|
|
|
|
class StreamReader(Codec, codecs.StreamReader):
|
|
charbuffertype = bytes
|
|
|
|
### encodings module API
|
|
|
|
def getregentry():
|
|
return codecs.CodecInfo(
|
|
name='uu',
|
|
encode=uu_encode,
|
|
decode=uu_decode,
|
|
incrementalencoder=IncrementalEncoder,
|
|
incrementaldecoder=IncrementalDecoder,
|
|
streamreader=StreamReader,
|
|
streamwriter=StreamWriter,
|
|
_is_text_encoding=False,
|
|
)
|