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"""Implements (a subset of) Sun XDR -- eXternal Data Representation.
See: RFC 1014
"""
import struct
# exceptions
class Error:
"""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 = ''
def get_buffer(self):
return self.__buf
# backwards compatibility
get_buf = get_buffer
def pack_uint(self, x):
self.__buf = self.__buf + struct.pack('>L', x)
pack_int = pack_uint
pack_enum = pack_int
def pack_bool(self, x):
if x: self.__buf = self.__buf + '\0\0\0\1'
else: self.__buf = self.__buf + '\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 = self.__buf + struct.pack('>f', x)
except struct.error, msg:
raise ConversionError, msg
def pack_double(self, x):
try: self.__buf = self.__buf + 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'
n = ((n+3)/4)*4
data = s[:n]
data = data + (n - len(data)) * '\0'
self.__buf = self.__buf + 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
unpack_bool = 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 ' + `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)
# test suite
def _test():
p = Packer()
packtest = [
(p.pack_uint, (9,)),
(p.pack_bool, (None,)),
(p.pack_bool, ('hello',)),
(p.pack_uhyper, (45L,)),
(p.pack_float, (1.9,)),
(p.pack_double, (1.9,)),
(p.pack_string, ('hello world',)),
(p.pack_list, (range(5), p.pack_uint)),
(p.pack_array, (['what', 'is', 'hapnin', 'doctor'], p.pack_string)),
]
succeedlist = [1] * len(packtest)
count = 0
for method, args in packtest:
print 'pack test', count,
try:
apply(method, args)
print 'succeeded'
except ConversionError, var:
print 'ConversionError:', var.msg
succeedlist[count] = 0
count = count + 1
data = p.get_buffer()
# now verify
up = Unpacker(data)
unpacktest = [
(up.unpack_uint, (), lambda x: x == 9),
(up.unpack_bool, (), lambda x: not x),
(up.unpack_bool, (), lambda x: x),
(up.unpack_uhyper, (), lambda x: x == 45L),
(up.unpack_float, (), lambda x: 1.89 < x < 1.91),
(up.unpack_double, (), lambda x: 1.89 < x < 1.91),
(up.unpack_string, (), lambda x: x == 'hello world'),
(up.unpack_list, (up.unpack_uint,), lambda x: x == range(5)),
(up.unpack_array, (up.unpack_string,),
lambda x: x == ['what', 'is', 'hapnin', 'doctor']),
]
count = 0
for method, args, pred in unpacktest:
print 'unpack test', count,
try:
if succeedlist[count]:
x = apply(method, args)
print pred(x) and 'succeeded' or 'failed', ':', x
else:
print 'skipping'
except ConversionError, var:
print 'ConversionError:', var.msg
count = count + 1
if __name__ == '__main__':
_test()
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