321 lines
7.5 KiB
Python
321 lines
7.5 KiB
Python
# Written by Petru Paler, Uoti Urpala, Ross Cohen and John Hoffman
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# see LICENSE.txt for license information
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from __future__ import print_function
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from types import IntType, LongType, StringType, ListType, TupleType, DictType
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try:
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from types import BooleanType
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except ImportError:
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BooleanType = None
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try:
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from types import UnicodeType
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except ImportError:
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UnicodeType = None
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from cStringIO import StringIO
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def decode_int(x, f):
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f += 1
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newf = x.index('e', f)
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try:
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n = int(x[f:newf])
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except:
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n = long(x[f:newf])
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if x[f] == '-':
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if x[f + 1] == '0':
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raise ValueError
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elif x[f] == '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(':', f)
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try:
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n = int(x[f:colon])
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except (OverflowError, ValueError):
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n = long(x[f:colon])
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if x[f] == '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_unicode(x, f):
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s, f = decode_string(x, f+1)
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return (s.decode('UTF-8'),f)
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def decode_list(x, f):
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r, f = [], f+1
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while x[f] != 'e':
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v, f = decode_func[x[f]](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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lastkey = None
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while x[f] != 'e':
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k, f = decode_string(x, f)
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# why is this needed
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# if lastkey >= k:
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# raise ValueError
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lastkey = k
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r[k], f = decode_func[x[f]](x, f)
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return (r, f + 1)
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decode_func = {}
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decode_func['l'] = decode_list
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decode_func['d'] = decode_dict
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decode_func['i'] = decode_int
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decode_func['0'] = decode_string
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decode_func['1'] = decode_string
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decode_func['2'] = decode_string
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decode_func['3'] = decode_string
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decode_func['4'] = decode_string
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decode_func['5'] = decode_string
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decode_func['6'] = decode_string
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decode_func['7'] = decode_string
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decode_func['8'] = decode_string
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decode_func['9'] = decode_string
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#decode_func['u'] = decode_unicode
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def bdecode(x, sloppy = 1):
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try:
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r, l = decode_func[x[0]](x, 0)
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# except (IndexError, KeyError):
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except (IndexError, KeyError, ValueError):
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raise ValueError("bad bencoded data")
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if not sloppy and l != len(x):
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raise ValueError("bad bencoded data")
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return r
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def test_bdecode():
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try:
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bdecode('0:0:')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('ie')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('i341foo382e')
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assert 0
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except ValueError:
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pass
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assert bdecode('i4e') == 4
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assert bdecode('i0e') == 0
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assert bdecode('i123456789e') == 123456789
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assert bdecode('i-10e') == -10
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try:
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bdecode('i-0e')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('i123')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('i6easd')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('35208734823ljdahflajhdf')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('2:abfdjslhfld')
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assert 0
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except ValueError:
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pass
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assert bdecode('0:') == ''
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assert bdecode('3:abc') == 'abc'
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assert bdecode('10:1234567890') == '1234567890'
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try:
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bdecode('02:xy')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('l')
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assert 0
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except ValueError:
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pass
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assert bdecode('le') == []
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try:
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bdecode('leanfdldjfh')
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assert 0
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except ValueError:
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pass
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assert bdecode('l0:0:0:e') == ['', '', '']
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try:
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bdecode('relwjhrlewjh')
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assert 0
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except ValueError:
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pass
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assert bdecode('li1ei2ei3ee') == [1, 2, 3]
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assert bdecode('l3:asd2:xye') == ['asd', 'xy']
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assert bdecode('ll5:Alice3:Bobeli2ei3eee') == [['Alice', 'Bob'], [2, 3]]
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try:
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bdecode('d')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('defoobar')
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assert 0
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except ValueError:
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pass
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assert bdecode('de') == {}
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assert bdecode('d3:agei25e4:eyes4:bluee') == {'age': 25, 'eyes': 'blue'}
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assert bdecode('d8:spam.mp3d6:author5:Alice6:lengthi100000eee') == {'spam.mp3': {'author': 'Alice', 'length': 100000}}
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try:
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bdecode('d3:fooe')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('di1e0:e')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('d1:b0:1:a0:e')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('d1:a0:1:a0:e')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('i03e')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('l01:ae')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('9999:x')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('l0:')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('d0:0:')
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assert 0
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except ValueError:
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pass
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try:
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bdecode('d0:')
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assert 0
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except ValueError:
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pass
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bencached_marker = []
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class Bencached:
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def __init__(self, s):
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self.marker = bencached_marker
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self.bencoded = s
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BencachedType = type(Bencached('')) # insufficient, but good as a filter
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def encode_bencached(x,r):
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assert x.marker == bencached_marker
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r.append(x.bencoded)
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def encode_int(x,r):
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r.extend(('i',str(x),'e'))
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def encode_bool(x,r):
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encode_int(int(x),r)
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def encode_string(x,r):
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r.extend((str(len(x)),':',x))
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def encode_unicode(x,r):
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#r.append('u')
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encode_string(x.encode('UTF-8'),r)
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def encode_list(x,r):
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r.append('l')
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for e in x:
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encode_func[type(e)](e, r)
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r.append('e')
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def encode_dict(x,r):
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r.append('d')
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ilist = x.items()
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ilist.sort()
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for k,v in ilist:
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r.extend((str(len(k)),':',k))
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encode_func[type(v)](v, r)
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r.append('e')
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encode_func = {}
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encode_func[BencachedType] = encode_bencached
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encode_func[IntType] = encode_int
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encode_func[LongType] = encode_int
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encode_func[StringType] = encode_string
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encode_func[ListType] = encode_list
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encode_func[TupleType] = encode_list
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encode_func[DictType] = encode_dict
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if BooleanType:
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encode_func[BooleanType] = encode_bool
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if UnicodeType:
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encode_func[UnicodeType] = encode_unicode
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def bencode(x):
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r = []
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try:
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encode_func[type(x)](x, r)
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except:
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print("*** error *** could not encode type %s (value: %s)" % (type(x), x))
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assert 0
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return ''.join(r)
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def test_bencode():
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assert bencode(4) == 'i4e'
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assert bencode(0) == 'i0e'
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assert bencode(-10) == 'i-10e'
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assert bencode(12345678901234567890) == 'i12345678901234567890e'
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assert bencode('') == '0:'
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assert bencode('abc') == '3:abc'
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assert bencode('1234567890') == '10:1234567890'
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assert bencode([]) == 'le'
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assert bencode([1, 2, 3]) == 'li1ei2ei3ee'
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assert bencode([['Alice', 'Bob'], [2, 3]]) == 'll5:Alice3:Bobeli2ei3eee'
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assert bencode({}) == 'de'
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assert bencode({'age': 25, 'eyes': 'blue'}) == 'd3:agei25e4:eyes4:bluee'
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assert bencode({'spam.mp3': {'author': 'Alice', 'length': 100000}}) == 'd8:spam.mp3d6:author5:Alice6:lengthi100000eee'
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try:
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bencode({1: 'foo'})
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assert 0
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except AssertionError:
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pass
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try:
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import psyco
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psyco.bind(bdecode)
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psyco.bind(bencode)
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except ImportError:
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pass
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