/usr/lib/python2.7/xdrlib.py is in libpython2.7-stdlib 2.7.6-8ubuntu0.5.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 | """Implements (a subset of) Sun XDR -- eXternal Data Representation.
See: RFC 1014
"""
import struct
try:
from cStringIO import StringIO as _StringIO
except ImportError:
from StringIO import StringIO as _StringIO
__all__ = ["Error", "Packer", "Unpacker", "ConversionError"]
# exceptions
class Error(Exception):
"""Exception class for this module. Use:
except xdrlib.Error, var:
# var has the Error instance for the exception
Public ivars:
msg -- contains the message
"""
def __init__(self, msg):
self.msg = msg
def __repr__(self):
return repr(self.msg)
def __str__(self):
return str(self.msg)
class ConversionError(Error):
pass
class Packer:
"""Pack various data representations into a buffer."""
def __init__(self):
self.reset()
def reset(self):
self.__buf = _StringIO()
def get_buffer(self):
return self.__buf.getvalue()
# backwards compatibility
get_buf = get_buffer
def pack_uint(self, x):
self.__buf.write(struct.pack('>L', x))
def pack_int(self, x):
self.__buf.write(struct.pack('>l', x))
pack_enum = pack_int
def pack_bool(self, x):
if x: self.__buf.write('\0\0\0\1')
else: self.__buf.write('\0\0\0\0')
def pack_uhyper(self, x):
self.pack_uint(x>>32 & 0xffffffffL)
self.pack_uint(x & 0xffffffffL)
pack_hyper = pack_uhyper
def pack_float(self, x):
try: self.__buf.write(struct.pack('>f', x))
except struct.error, msg:
raise ConversionError, msg
def pack_double(self, x):
try: self.__buf.write(struct.pack('>d', x))
except struct.error, msg:
raise ConversionError, msg
def pack_fstring(self, n, s):
if n < 0:
raise ValueError, 'fstring size must be nonnegative'
data = s[:n]
n = ((n+3)//4)*4
data = data + (n - len(data)) * '\0'
self.__buf.write(data)
pack_fopaque = pack_fstring
def pack_string(self, s):
n = len(s)
self.pack_uint(n)
self.pack_fstring(n, s)
pack_opaque = pack_string
pack_bytes = pack_string
def pack_list(self, list, pack_item):
for item in list:
self.pack_uint(1)
pack_item(item)
self.pack_uint(0)
def pack_farray(self, n, list, pack_item):
if len(list) != n:
raise ValueError, 'wrong array size'
for item in list:
pack_item(item)
def pack_array(self, list, pack_item):
n = len(list)
self.pack_uint(n)
self.pack_farray(n, list, pack_item)
class Unpacker:
"""Unpacks various data representations from the given buffer."""
def __init__(self, data):
self.reset(data)
def reset(self, data):
self.__buf = data
self.__pos = 0
def get_position(self):
return self.__pos
def set_position(self, position):
self.__pos = position
def get_buffer(self):
return self.__buf
def done(self):
if self.__pos < len(self.__buf):
raise Error('unextracted data remains')
def unpack_uint(self):
i = self.__pos
self.__pos = j = i+4
data = self.__buf[i:j]
if len(data) < 4:
raise EOFError
x = struct.unpack('>L', data)[0]
try:
return int(x)
except OverflowError:
return x
def unpack_int(self):
i = self.__pos
self.__pos = j = i+4
data = self.__buf[i:j]
if len(data) < 4:
raise EOFError
return struct.unpack('>l', data)[0]
unpack_enum = unpack_int
def unpack_bool(self):
return bool(self.unpack_int())
def unpack_uhyper(self):
hi = self.unpack_uint()
lo = self.unpack_uint()
return long(hi)<<32 | lo
def unpack_hyper(self):
x = self.unpack_uhyper()
if x >= 0x8000000000000000L:
x = x - 0x10000000000000000L
return x
def unpack_float(self):
i = self.__pos
self.__pos = j = i+4
data = self.__buf[i:j]
if len(data) < 4:
raise EOFError
return struct.unpack('>f', data)[0]
def unpack_double(self):
i = self.__pos
self.__pos = j = i+8
data = self.__buf[i:j]
if len(data) < 8:
raise EOFError
return struct.unpack('>d', data)[0]
def unpack_fstring(self, n):
if n < 0:
raise ValueError, 'fstring size must be nonnegative'
i = self.__pos
j = i + (n+3)//4*4
if j > len(self.__buf):
raise EOFError
self.__pos = j
return self.__buf[i:i+n]
unpack_fopaque = unpack_fstring
def unpack_string(self):
n = self.unpack_uint()
return self.unpack_fstring(n)
unpack_opaque = unpack_string
unpack_bytes = unpack_string
def unpack_list(self, unpack_item):
list = []
while 1:
x = self.unpack_uint()
if x == 0: break
if x != 1:
raise ConversionError, '0 or 1 expected, got %r' % (x,)
item = unpack_item()
list.append(item)
return list
def unpack_farray(self, n, unpack_item):
list = []
for i in range(n):
list.append(unpack_item())
return list
def unpack_array(self, unpack_item):
n = self.unpack_uint()
return self.unpack_farray(n, unpack_item)
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