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bencode.py
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# The contents of this file are subject to the BitTorrent Open Source License
# Version 1.1 (the License). You may not copy or use this file, in either
# source code or executable form, except in compliance with the License. You
# may obtain a copy of the License at http://www.bittorrent.com/license/.
#
# Software distributed under the License is distributed on an AS IS basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
# Written by Petru Paler
"""
BitTorrent Open Source License
Version 1.1
This BitTorrent Open Source License (the "License") applies to the BitTorrent client and related software products as well as any updates or maintenance releases of that software ("BitTorrent Products") that are distributed by BitTorrent, Inc. ("Licensor"). Any BitTorrent Product licensed pursuant to this License is a Licensed Product. Licensed Product, in its entirety, is protected by U.S. copyright law. This License identifies the terms under which you may use, copy, distribute or modify Licensed Product.
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This License complies with the Open Source Definition and is derived from the Jabber Open Source License 1.0 (the "JOSL"), which has been approved by Open Source Initiative. Sections 4(c) and 4(f)(iii) from the JOSL have been deleted.
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12. U.S. Government End Users. The Licensed Product is a commercial item, as that term is defined in 48 C.F.R. 2.101 (Oct. 1995), consisting of commercial computer software and commercial computer software documentation, as such terms are used in 48 C.F.R. 12.212 (Sept. 1995). Consistent with 48 C.F.R. 12.212 and 48 C.F.R. 227.7202-1 through 227.7202-4 (June 1995), all U.S. Government End Users acquire Licensed Product with only those rights set forth herein.
13. Miscellaneous. This License represents the complete agreement concerning the subject matter hereof. If any provision of this License is held to be unenforceable, such provision shall be reformed only to the extent necessary to make it enforceable. This License shall be governed by California law provisions (except to the extent applicable law, if any, provides otherwise), excluding its conflict-of-law provisions. You expressly agree that in any litigation relating to this license the losing party shall be responsible for costs including, without limitation, court costs and reasonable attorneys fees and expenses. The application of the United Nations Convention on Contracts for the International Sale of Goods is expressly excluded. Any law or regulation that provides that the language of a contract shall be construed against the drafter shall not apply to this License.
14. Definition of You in This License. You throughout this License, whether in upper or lower case, means an individual or a legal entity exercising rights under, and complying with all of the terms of, this License or a future version of this License issued under Section 7. For legal entities, you includes any entity that controls, is controlled by, is under common control with, or affiliated with, you. For purposes of this definition, control means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. You are responsible for advising any affiliated entity of the terms of this License, and that any rights or privileges derived from or obtained by way of this License are subject to the restrictions outlined herein.
15. Glossary. All defined terms in this License that are used in more than one Section of this License are repeated here, in alphabetical order, for the convenience of the reader. The Section of this License in which each defined term is first used is shown in parentheses.
Contributor: Each person or entity who created or contributed to the creation of, and distributed, a Modification. (See Section 2)
Derivative Works: That term as used in this License is defined under U.S. copyright law. (See Section 1(b))
License: This BitTorrent Open Source License. (See first paragraph of License)
Licensed Product: Any BitTorrent Product licensed pursuant to this License. The term "Licensed Product" includes all previous Modifications from any Contributor that you receive. (See first paragraph of License and Section 2)
Licensor: BitTorrent, Inc. (See first paragraph of License)
Modifications: Any additions to or deletions from the substance or structure of (i) a file containing Licensed Product, or (ii) any new file that contains any part of Licensed Product. (See Section 2)
Notice: The notice contained in Exhibit A. (See Section 4(e))
Source Code: The preferred form for making modifications to the Licensed Product, including all modules contained therein, plus any associated interface definition files, scripts used to control compilation and installation of an executable program, or a list of differential comparisons against the Source Code of the Licensed Product. (See Section 1(a))
You: This term is defined in Section 14 of this License.
EXHIBIT A
The Notice below must appear in each file of the Source Code of any copy you distribute of the Licensed Product or any hereto. Contributors to any Modifications may add their own copyright notices to identify their own contributions.
License:
The contents of this file are subject to the BitTorrent Open Source License Version 1.0 (the License). You may not copy or use this file, in either source code or executable form, except in compliance with the License. You may obtain a copy of the License at http://www.bittorrent.com/license/.
Software distributed under the License is distributed on an AS IS basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License.
"""
from BTL import BTFailure
def decode_int(x, f):
f += 1
newf = x.index('e', f)
n = int(x[f:newf])
if x[f] == '-':
if x[f + 1] == '0':
raise ValueError
elif x[f] == '0' and newf != f+1:
raise ValueError
return (n, newf+1)
def decode_string(x, f):
colon = x.index(':', f)
n = int(x[f:colon])
if x[f] == '0' and colon != f+1:
raise ValueError
colon += 1
return (x[colon:colon+n], colon+n)
def decode_list(x, f):
r, f = [], f+1
while x[f] != 'e':
v, f = decode_func[x[f]](x, f)
r.append(v)
return (r, f + 1)
def decode_dict(x, f):
r, f = {}, f+1
while x[f] != 'e':
k, f = decode_string(x, f)
r[k], f = decode_func[x[f]](x, f)
return (r, f + 1)
decode_func = {}
decode_func['l'] = decode_list
decode_func['d'] = decode_dict
decode_func['i'] = decode_int
decode_func['0'] = decode_string
decode_func['1'] = decode_string
decode_func['2'] = decode_string
decode_func['3'] = decode_string
decode_func['4'] = decode_string
decode_func['5'] = decode_string
decode_func['6'] = decode_string
decode_func['7'] = decode_string
decode_func['8'] = decode_string
decode_func['9'] = decode_string
def bdecode(x):
try:
r, l = decode_func[x[0]](x, 0)
except (IndexError, KeyError, ValueError):
raise BTFailure("not a valid bencoded string")
if l != len(x):
raise BTFailure("invalid bencoded value (data after valid prefix)")
return r
from types import StringType, IntType, LongType, DictType, ListType, TupleType
class Bencached(object):
__slots__ = ['bencoded']
def __init__(self, s):
self.bencoded = s
def encode_bencached(x,r):
r.append(x.bencoded)
def encode_int(x, r):
r.extend(('i', str(x), 'e'))
def encode_bool(x, r):
if x:
encode_int(1, r)
else:
encode_int(0, r)
def encode_string(x, r):
r.extend((str(len(x)), ':', x))
def encode_list(x, r):
r.append('l')
for i in x:
encode_func[type(i)](i, r)
r.append('e')
def encode_dict(x,r):
r.append('d')
ilist = x.items()
ilist.sort()
for k, v in ilist:
r.extend((str(len(k)), ':', k))
encode_func[type(v)](v, r)
r.append('e')
encode_func = {}
encode_func[Bencached] = encode_bencached
encode_func[IntType] = encode_int
encode_func[LongType] = encode_int
encode_func[StringType] = encode_string
encode_func[ListType] = encode_list
encode_func[TupleType] = encode_list
encode_func[DictType] = encode_dict
try:
from types import BooleanType
encode_func[BooleanType] = encode_bool
except ImportError:
pass
def bencode(x):
r = []
encode_func[type(x)](x, r)
return ''.join(r)