321 lines
7.4 KiB
Python
321 lines
7.4 KiB
Python
# Written by Petru Paler, Uoti Urpala, Ross Cohen and John Hoffman
|
|
# see LICENSE.txt for license information
|
|
|
|
from types import IntType, LongType, StringType, ListType, TupleType, DictType
|
|
try:
|
|
from types import BooleanType
|
|
except ImportError:
|
|
BooleanType = None
|
|
try:
|
|
from types import UnicodeType
|
|
except ImportError:
|
|
UnicodeType = None
|
|
from cStringIO import StringIO
|
|
|
|
def decode_int(x, f):
|
|
f += 1
|
|
newf = x.index('e', f)
|
|
try:
|
|
n = int(x[f:newf])
|
|
except:
|
|
n = long(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)
|
|
try:
|
|
n = int(x[f:colon])
|
|
except (OverflowError, ValueError):
|
|
n = long(x[f:colon])
|
|
if x[f] == '0' and colon != f+1:
|
|
raise ValueError
|
|
colon += 1
|
|
return (x[colon:colon+n], colon+n)
|
|
|
|
def decode_unicode(x, f):
|
|
s, f = decode_string(x, f+1)
|
|
return (s.decode('UTF-8'),f)
|
|
|
|
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
|
|
lastkey = None
|
|
while x[f] != 'e':
|
|
k, f = decode_string(x, f)
|
|
#why is this needed
|
|
#if lastkey >= k:
|
|
# raise ValueError
|
|
lastkey = k
|
|
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
|
|
#decode_func['u'] = decode_unicode
|
|
|
|
def bdecode(x, sloppy = 1):
|
|
try:
|
|
r, l = decode_func[x[0]](x, 0)
|
|
# except (IndexError, KeyError):
|
|
except (IndexError, KeyError, ValueError):
|
|
raise ValueError, "bad bencoded data"
|
|
if not sloppy and l != len(x):
|
|
raise ValueError, "bad bencoded data"
|
|
return r
|
|
|
|
def test_bdecode():
|
|
try:
|
|
bdecode('0:0:')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('ie')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('i341foo382e')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
assert bdecode('i4e') == 4L
|
|
assert bdecode('i0e') == 0L
|
|
assert bdecode('i123456789e') == 123456789L
|
|
assert bdecode('i-10e') == -10L
|
|
try:
|
|
bdecode('i-0e')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('i123')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('i6easd')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('35208734823ljdahflajhdf')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('2:abfdjslhfld')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
assert bdecode('0:') == ''
|
|
assert bdecode('3:abc') == 'abc'
|
|
assert bdecode('10:1234567890') == '1234567890'
|
|
try:
|
|
bdecode('02:xy')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('l')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
assert bdecode('le') == []
|
|
try:
|
|
bdecode('leanfdldjfh')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
assert bdecode('l0:0:0:e') == ['', '', '']
|
|
try:
|
|
bdecode('relwjhrlewjh')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
assert bdecode('li1ei2ei3ee') == [1, 2, 3]
|
|
assert bdecode('l3:asd2:xye') == ['asd', 'xy']
|
|
assert bdecode('ll5:Alice3:Bobeli2ei3eee') == [['Alice', 'Bob'], [2, 3]]
|
|
try:
|
|
bdecode('d')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('defoobar')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
assert bdecode('de') == {}
|
|
assert bdecode('d3:agei25e4:eyes4:bluee') == {'age': 25, 'eyes': 'blue'}
|
|
assert bdecode('d8:spam.mp3d6:author5:Alice6:lengthi100000eee') == {'spam.mp3': {'author': 'Alice', 'length': 100000}}
|
|
try:
|
|
bdecode('d3:fooe')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('di1e0:e')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('d1:b0:1:a0:e')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('d1:a0:1:a0:e')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('i03e')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('l01:ae')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('9999:x')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('l0:')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('d0:0:')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
try:
|
|
bdecode('d0:')
|
|
assert 0
|
|
except ValueError:
|
|
pass
|
|
|
|
bencached_marker = []
|
|
|
|
class Bencached:
|
|
def __init__(self, s):
|
|
self.marker = bencached_marker
|
|
self.bencoded = s
|
|
|
|
BencachedType = type(Bencached('')) # insufficient, but good as a filter
|
|
|
|
def encode_bencached(x,r):
|
|
assert x.marker == bencached_marker
|
|
r.append(x.bencoded)
|
|
|
|
def encode_int(x,r):
|
|
r.extend(('i',str(x),'e'))
|
|
|
|
def encode_bool(x,r):
|
|
encode_int(int(x),r)
|
|
|
|
def encode_string(x,r):
|
|
r.extend((str(len(x)),':',x))
|
|
|
|
def encode_unicode(x,r):
|
|
#r.append('u')
|
|
encode_string(x.encode('UTF-8'),r)
|
|
|
|
def encode_list(x,r):
|
|
r.append('l')
|
|
for e in x:
|
|
encode_func[type(e)](e, 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[BencachedType] = 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
|
|
if BooleanType:
|
|
encode_func[BooleanType] = encode_bool
|
|
if UnicodeType:
|
|
encode_func[UnicodeType] = encode_unicode
|
|
|
|
def bencode(x):
|
|
r = []
|
|
try:
|
|
encode_func[type(x)](x, r)
|
|
except:
|
|
print "*** error *** could not encode type %s (value: %s)" % (type(x), x)
|
|
assert 0
|
|
return ''.join(r)
|
|
|
|
def test_bencode():
|
|
assert bencode(4) == 'i4e'
|
|
assert bencode(0) == 'i0e'
|
|
assert bencode(-10) == 'i-10e'
|
|
assert bencode(12345678901234567890L) == 'i12345678901234567890e'
|
|
assert bencode('') == '0:'
|
|
assert bencode('abc') == '3:abc'
|
|
assert bencode('1234567890') == '10:1234567890'
|
|
assert bencode([]) == 'le'
|
|
assert bencode([1, 2, 3]) == 'li1ei2ei3ee'
|
|
assert bencode([['Alice', 'Bob'], [2, 3]]) == 'll5:Alice3:Bobeli2ei3eee'
|
|
assert bencode({}) == 'de'
|
|
assert bencode({'age': 25, 'eyes': 'blue'}) == 'd3:agei25e4:eyes4:bluee'
|
|
assert bencode({'spam.mp3': {'author': 'Alice', 'length': 100000}}) == 'd8:spam.mp3d6:author5:Alice6:lengthi100000eee'
|
|
try:
|
|
bencode({1: 'foo'})
|
|
assert 0
|
|
except AssertionError:
|
|
pass
|
|
|
|
|
|
try:
|
|
import psyco
|
|
psyco.bind(bdecode)
|
|
psyco.bind(bencode)
|
|
except ImportError:
|
|
pass
|