# Implement (a subset of) Sun XDR -- RFC1014.

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try:

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import struct

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except ImportError:

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struct = None

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Long = type(0L)

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class Packer:

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def __init__(self):

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self.reset()

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def reset(self):

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self.buf = ''

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def get_buf(self):

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return self.buf

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def pack_uint(self, x):

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self.buf = self.buf + \

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(chr(int(x>>24 & 0xff)) + chr(int(x>>16 & 0xff)) + \

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chr(int(x>>8 & 0xff)) + chr(int(x & 0xff)))

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if struct and struct.pack('l', 1) == '\0\0\0\1':

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def pack_uint(self, x):

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if type(x) == Long:

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x = int((x + 0x80000000L) % 0x100000000L \

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- 0x80000000L)

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self.buf = self.buf + struct.pack('l', x)

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pack_int = pack_uint

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pack_enum = pack_int

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def pack_bool(self, x):

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if x: self.buf = self.buf + '\0\0\0\1'

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else: self.buf = self.buf + '\0\0\0\0'

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def pack_uhyper(self, x):

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self.pack_uint(int(x>>32 & 0xffffffff))

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self.pack_uint(int(x & 0xffffffff))

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pack_hyper = pack_uhyper

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def pack_float(self, x):

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# XXX

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self.buf = self.buf + struct.pack('f', x)

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def pack_double(self, x):

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# XXX

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self.buf = self.buf + struct.pack('d', x)

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def pack_fstring(self, n, s):

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if n < 0:

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raise ValueError, 'fstring size must be nonnegative'

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n = ((n + 3)//4)*4

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data = s[:n]

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data = data + (n - len(data)) * '\0'

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self.buf = self.buf + data

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pack_fopaque = pack_fstring

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def pack_string(self, s):

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n = len(s)

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self.pack_uint(n)

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self.pack_fstring(n, s)

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pack_opaque = pack_string

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def pack_list(self, list, pack_item):

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for item in list:

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self.pack_uint(1)

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pack_item(item)

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self.pack_uint(0)

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def pack_farray(self, n, list, pack_item):

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if len(list) <> n:

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raise ValueError, 'wrong array size'

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for item in list:

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pack_item(item)

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def pack_array(self, list, pack_item):

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n = len(list)

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self.pack_uint(n)

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self.pack_farray(n, list, pack_item)

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class Unpacker:

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def __init__(self, data):

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self.reset(data)

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def reset(self, data):

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self.buf = data

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self.pos = 0

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def done(self):

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if self.pos < len(self.buf):

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raise RuntimeError, 'unextracted data remains'

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def unpack_uint(self):

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i = self.pos

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self.pos = j = i+4

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data = self.buf[i:j]

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if len(data) < 4:

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raise EOFError

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x = long(ord(data[0]))<<24 | ord(data[1])<<16 | \

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ord(data[2])<<8 | ord(data[3])

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# Return a Python long only if the value is not representable

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# as a nonnegative Python int

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if x < 0x80000000L: x = int(x)

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return x

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if struct and struct.unpack('l', '\0\0\0\1') == 1:

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def unpack_uint(self):

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i = self.pos

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self.pos = j = i+4

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data = self.buf[i:j]

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if len(data) < 4:

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raise EOFError

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return struct.unpack('l', data)

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def unpack_int(self):

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x = self.unpack_uint()

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if x >= 0x80000000L: x = x - 0x100000000L

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return int(x)

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unpack_enum = unpack_int

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unpack_bool = unpack_int

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def unpack_uhyper(self):

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hi = self.unpack_uint()

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lo = self.unpack_uint()

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return long(hi)<<32 | lo

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def unpack_hyper(self):

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x = self.unpack_uhyper()

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if x >= 0x8000000000000000L: x = x - 0x10000000000000000L

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return x

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def unpack_float(self):

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# XXX

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i = self.pos

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self.pos = j = i+4

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data = self.buf[i:j]

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if len(data) < 4:

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raise EOFError

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return struct.unpack('f', data)[0]

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def unpack_double(self):

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# XXX

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i = self.pos

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self.pos = j = i+8

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data = self.buf[i:j]

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if len(data) < 8:

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raise EOFError

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return struct.unpack('d', data)[0]

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def unpack_fstring(self, n):

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if n < 0:

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raise ValueError, 'fstring size must be nonnegative'

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i = self.pos

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j = i + (n+3)//4*4

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if j > len(self.buf):

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raise EOFError

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self.pos = j

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return self.buf[i:i+n]

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unpack_fopaque = unpack_fstring

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def unpack_string(self):

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n = self.unpack_uint()

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return self.unpack_fstring(n)

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unpack_opaque = unpack_string

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def unpack_list(self, unpack_item):

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list = []

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while 1:

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x = self.unpack_uint()

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if x == 0: break

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if x <> 1:

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raise RuntimeError, '0 or 1 expected, got %r' % (x, )

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item = unpack_item()

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list.append(item)

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return list

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def unpack_farray(self, n, unpack_item):

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list = []

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for i in range(n):

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list.append(unpack_item())

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return list

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def unpack_array(self, unpack_item):

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n = self.unpack_uint()

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return self.unpack_farray(n, unpack_item)

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