def decode(self, object, **kwds):
szone,pu = self.getparent(szone_t),object.get()
cookie = szone['cookie'].li.int()
t = bitmap.new(pu, object.size()*8)
t = bitmap.rol(t, 4)
ptr = bitmap.number(t) & ~0xf
cs = ptr ^ cookie
if bitmap.number(t)&0xf != self.generate_checksum(cs):
logging.warn("{:s}.ptr_union.decode : Checksum doesn't match with cookie 0x{:x} : 0x{:x} != 0x{:x}".format(__name__, cookie, bitmap.number(t)&0xf, self.generate_checksum(cs)))
res = object.copy().set(ptr)
return super(ptr_union,self).decode(res, **kwds)
def encode(self, object, **kwds):
szone,pu = self.getparent(szone_t),object.get()
cookie = szone['cookie'].li.int()
csum = self.generate_checksum(pu^cookie)
t = bitmap.new(pu, object.size()*8)
t = bitmap.rol(t, 4)
cs = bitmap.new(bitmap.number(t)|csum, bitmap.size(t))
cs = bitmap.ror(cs, 4)
logging.info("{:s}.ptr_union.encode : Encoded pointer 0x{:x} with 0x{:x} results in checksum 0x{:x} : {:s}".format(__name__, pu, cookie, csum, bitmap.hex(cs)))
res = object.copy().set(bitmap.number(cs))
return super(ptr_union,self).encode(res, **kwds)
def decode(self, object, **kwds):
szone, pu = self.getparent(szone_t), object.get()
cookie = szone['cookie'].li.int()
t = bitmap.new(pu, object.size() * 8)
t = bitmap.rol(t, 4)
ptr = bitmap.number(t) & ~0xf
cs = ptr ^ cookie
if bitmap.number(t) & 0xf != self.generate_checksum(cs):
logging.warn(
"{:s}.ptr_union.decode : Checksum doesn't match with cookie 0x{:x} : 0x{:x} != 0x{:x}"
.format(__name__, cookie,
bitmap.number(t) & 0xf, self.generate_checksum(cs)))
res = object.copy().set(ptr)
return super(ptr_union, self).decode(res, **kwds)
def encode(self, object, **kwds):
szone, pu = self.getparent(szone_t), object.get()
cookie = szone['cookie'].li.int()
csum = self.generate_checksum(pu ^ cookie)
t = bitmap.new(pu, object.size() * 8)
t = bitmap.rol(t, 4)
cs = bitmap.new(bitmap.number(t) | csum, bitmap.size(t))
cs = bitmap.ror(cs, 4)
logging.info(
"{:s}.ptr_union.encode : Encoded pointer 0x{:x} with 0x{:x} results in checksum 0x{:x} : {:s}"
.format(__name__, pu, cookie, csum, bitmap.hex(cs)))
res = object.copy().set(bitmap.number(cs))
return super(ptr_union, self).encode(res, **kwds)
def str(self):
data = map(ord, self.serialize())
res = [data[0] / 40, data.pop(0) % 40]
data = iter(data)
for n in data:
v = bitmap.new(0, 0)
while n & 0x80:
v = bitmap.push(v, (n & 0x7f, 7))
n = data.next()
v = bitmap.push(v, (n, 7))
res.append(bitmap.number(v))
return '.'.join(map(str, res))
def get_pointer(self):
'''Returns the encoded pointer'''
res = bitmap.new(self.int(), self.size()*8)
res = bitmap.rol(res, 4)
res = bitmap.number(res) & ~0xf
return res
def get_checksum(self):
'''Returns the encoded checksum for the ptr_union'''
pu = self.int()
t = bitmap.new(pu, self.size()*8)
t = bitmap.rol(t, 4)
return bitmap.number(t) & 0xf
def generate_checksum(self, ptr):
pu = bitmap.new(ptr, self.size()*8)
res = reduce(bitmap.add, map(bitmap.number,bitmap.split(pu,8)), bitmap.new(0,8))
return bitmap.number(res) & 0xf
def get_pointer(self):
'''Returns the encoded pointer'''
res = bitmap.new(self.int(), self.size() * 8)
res = bitmap.rol(res, 4)
res = bitmap.number(res) & ~0xf
return res
def get_checksum(self):
'''Returns the encoded checksum for the ptr_union'''
pu = self.int()
t = bitmap.new(pu, self.size() * 8)
t = bitmap.rol(t, 4)
return bitmap.number(t) & 0xf
def generate_checksum(self, ptr):
pu = bitmap.new(ptr, self.size() * 8)
res = reduce(bitmap.add, map(bitmap.number, bitmap.split(pu, 8)),
bitmap.new(0, 8))
return bitmap.number(res) & 0xf
