/usr/lib/python3/dist-packages/skytools/tnetstrings.py is in python3-skytools 3.3-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 | """TNetStrings.
>>> def ustr(v): return repr(v).replace("u'", "'")
>>> def nstr(b): return b.decode('utf8')
>>> if isinstance('qwe', bytes): nstr = str
>>> vals = (None, False, True, 222, 333.0, "foo", u"bar")
>>> tnvals = [nstr(dumps(v)) for v in vals]
>>> tnvals
['0:~', '5:false!', '4:true!', '3:222#', '5:333.0^', '3:foo,', '3:bar,']
>>> vals2 = [[], (), {}, [1,2], {'a':'b'}]
>>> tnvals2 = [nstr(dumps(v)) for v in vals2]
>>> tnvals2
['0:]', '0:]', '0:}', '8:1:1#1:2#]', '8:1:a,1:b,}']
>>> ustr([parse(dumps(v)) for v in vals])
"[None, False, True, 222, 333.0, 'foo', 'bar']"
>>> ustr([parse(dumps(v)) for v in vals2])
"[[], [], {}, [1, 2], {'a': 'b'}]"
>>> nstr(dumps([memoryview(b'zzz'),b'qqq']))
'12:3:zzz,3:qqq,]'
Error handling:
>>> def errtest(bstr, exc):
... try:
... loads(bstr)
... raise Exception('no exception')
... except exc:
... return None
>>> errtest(b'4:qwez!', ValueError)
>>> errtest(b'4:', ValueError)
>>> errtest(b'4:qwez', ValueError)
>>> errtest(b'4', ValueError)
>>> errtest(b'', ValueError)
>>> errtest(b'999999999999999999:z,', ValueError)
>>> errtest(u'qweqwe', TypeError)
>>> errtest(b'4:true!0:~', ValueError)
>>> errtest(b'1:X~', ValueError)
>>> errtest(b'8:1:1#1:2#}', ValueError)
>>> errtest(b'1:Xz', ValueError)
>>> dumps(divmod)
Traceback (most recent call last):
...
TypeError: Object type not supported: <built-in function divmod>
"""
from __future__ import division, absolute_import, print_function
import codecs
__all__ = ['loads', 'dumps']
try:
unicode
except NameError:
unicode = str # noqa
long = int # noqa
_memstr_types = (unicode, bytes, memoryview)
_struct_types = (list, tuple, dict)
_inttypes = (int, long)
def _dumps(dst, val):
if isinstance(val, _struct_types):
tlenpos = len(dst)
tlen = 0
dst.append(None)
if isinstance(val, dict):
for k in val:
tlen += _dumps(dst, k)
tlen += _dumps(dst, val[k])
dst.append(b'}')
else:
for v in val:
tlen += _dumps(dst, v)
dst.append(b']')
dst[tlenpos] = b'%d:' % tlen
return len(dst[tlenpos]) + tlen + 1
elif isinstance(val, _memstr_types):
if isinstance(val, unicode):
bval = val.encode('utf8')
elif isinstance(val, memoryview):
bval = val.tobytes()
else:
bval = val
tval = b'%d:%s,' % (len(bval), bval)
elif isinstance(val, bool):
tval = val and b'4:true!' or b'5:false!'
elif isinstance(val, _inttypes):
bval = b'%d' % val
tval = b'%d:%s#' % (len(bval), bval)
elif isinstance(val, float):
bval = b'%r' % val
tval = b'%d:%s^' % (len(bval), bval)
elif val is None:
tval = b'0:~'
else:
raise TypeError("Object type not supported: %r" % val)
dst.append(tval)
return len(tval)
_decode_utf8 = codecs.getdecoder('utf8')
def _loads(buf):
pos = 0
maxlen = min(len(buf), 9)
while buf[pos:pos+1] != b':':
pos += 1
if pos > maxlen:
raise ValueError("Too large length")
lenbytes = buf[ : pos].tobytes()
tlen = int(lenbytes)
ofs = len(lenbytes) + 1
endofs = ofs + tlen
val = buf[ofs : endofs]
code = buf[endofs : endofs + 1]
rest = buf[endofs + 1:]
if len(val) + 1 != tlen + len(code):
raise ValueError("failed to load value, invalid length")
if code == b',':
return _decode_utf8(val)[0], rest
elif code == b'#':
return int(val.tobytes(), 10), rest
elif code == b'^':
return float(val.tobytes()), rest
elif code == b']':
listobj = []
while val:
elem, val = _loads(val)
listobj.append(elem)
return listobj, rest
elif code == b'}':
dictobj = {}
while val:
k, val = _loads(val)
if not isinstance(k, unicode):
raise ValueError("failed to load value, invalid key type")
dictobj[k], val = _loads(val)
return dictobj, rest
elif code == b'!':
if val == b'true':
return True, rest
if val == b'false':
return False, rest
raise ValueError("failed to load value, invalid boolean value")
elif code == b'~':
if val == b'':
return None, rest
raise ValueError("failed to load value, invalid null value")
else:
raise ValueError("failed to load value, invalid value code")
#
# Public API
#
def dumps(val):
"""Dump object tree as TNetString value.
"""
dst = []
_dumps(dst, val)
return b''.join(dst)
def loads(binval):
"""Parse TNetstring from byte string.
"""
if not isinstance(binval, (bytes, memoryview)):
raise TypeError("Bytes or memoryview required")
obj, rest = _loads(memoryview(binval))
if rest:
raise ValueError("Not all data processed")
return obj
# old compat?
parse = loads
dump = dumps
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