mirror of
https://github.com/codex-storage/deluge.git
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ec0bcc11f5
Added pyupgrade utility with manual stage to pre-commit and run on all files. Ref: https://github.com/asottile/pyupgrade Closes: deluge-torrent/deluge#326
149 lines
3.4 KiB
Python
149 lines
3.4 KiB
Python
# The contents of this file are subject to the Python Software Foundation
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# License Version 2.3 (the License). You may not copy or use this file, in
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# either source code or executable form, except in compliance with the License.
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# You may obtain a copy of the License at http://www.python.org/license.
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#
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# Software distributed under the License is distributed on an AS IS basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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# for the specific language governing rights and limitations under the
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# License.
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# Written by Petru Paler
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# Updated by Calum Lind to support Python 3.
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class BTFailure(Exception):
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pass
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DICT_DELIM = b'd'
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END_DELIM = b'e'
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INT_DELIM = b'i'
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LIST_DELIM = b'l'
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BYTE_SEP = b':'
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def decode_int(x, f):
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f += 1
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newf = x.index(END_DELIM, f)
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n = int(x[f:newf])
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if x[f : f + 1] == b'-' and x[f + 1 : f + 2] == b'0':
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raise ValueError
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elif x[f : f + 1] == b'0' and newf != f + 1:
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raise ValueError
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return (n, newf + 1)
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def decode_string(x, f):
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colon = x.index(BYTE_SEP, f)
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n = int(x[f:colon])
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if x[f : f + 1] == b'0' and colon != f + 1:
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raise ValueError
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colon += 1
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return (x[colon : colon + n], colon + n)
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def decode_list(x, f):
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r, f = [], f + 1
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while x[f : f + 1] != END_DELIM:
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v, f = decode_func[x[f : f + 1]](x, f)
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r.append(v)
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return (r, f + 1)
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def decode_dict(x, f):
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r, f = {}, f + 1
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while x[f : f + 1] != END_DELIM:
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k, f = decode_string(x, f)
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r[k], f = decode_func[x[f : f + 1]](x, f)
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return (r, f + 1)
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decode_func = {}
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decode_func[LIST_DELIM] = decode_list
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decode_func[DICT_DELIM] = decode_dict
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decode_func[INT_DELIM] = decode_int
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decode_func[b'0'] = decode_string
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decode_func[b'1'] = decode_string
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decode_func[b'2'] = decode_string
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decode_func[b'3'] = decode_string
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decode_func[b'4'] = decode_string
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decode_func[b'5'] = decode_string
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decode_func[b'6'] = decode_string
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decode_func[b'7'] = decode_string
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decode_func[b'8'] = decode_string
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decode_func[b'9'] = decode_string
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def bdecode(x):
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try:
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r, __ = decode_func[x[0:1]](x, 0)
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except (LookupError, TypeError, ValueError):
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raise BTFailure('Not a valid bencoded string')
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else:
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return r
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class Bencached:
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__slots__ = ['bencoded']
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def __init__(self, s):
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self.bencoded = s
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def encode_bencached(x, r):
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r.append(x.bencoded)
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def encode_int(x, r):
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r.extend((INT_DELIM, str(x).encode('utf8'), END_DELIM))
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def encode_bool(x, r):
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encode_int(1 if x else 0, r)
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def encode_string(x, r):
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encode_bytes(x.encode('utf8'), r)
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def encode_bytes(x, r):
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r.extend((str(len(x)).encode('utf8'), BYTE_SEP, x))
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def encode_list(x, r):
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r.append(LIST_DELIM)
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for i in x:
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encode_func[type(i)](i, r)
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r.append(END_DELIM)
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def encode_dict(x, r):
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r.append(DICT_DELIM)
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for k, v in sorted(x.items()):
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try:
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k = k.encode('utf8')
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except AttributeError:
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pass
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r.extend((str(len(k)).encode('utf8'), BYTE_SEP, k))
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encode_func[type(v)](v, r)
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r.append(END_DELIM)
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encode_func = {}
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encode_func[Bencached] = encode_bencached
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encode_func[int] = encode_int
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encode_func[list] = encode_list
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encode_func[tuple] = encode_list
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encode_func[dict] = encode_dict
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encode_func[bool] = encode_bool
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encode_func[str] = encode_string
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encode_func[bytes] = encode_bytes
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def bencode(x):
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r = []
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encode_func[type(x)](x, r)
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return b''.join(r)
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