0,0 → 1,319 |
# 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) |
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 = 0): |
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 |