Example #1
0
    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)
Example #2
0
    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)
Example #3
0
    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)
Example #4
0
    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)
Example #5
0
 def bitmap_rol4_value():
     res = bitmap.new(0b0110, 4)
     if bitmap.int(bitmap.rol(res, 4)) == 0b0110:
         raise Success
Example #6
0
 def bitmap_rol2_value():
     res = bitmap.new(0b0110, 4)
     if bitmap.int(bitmap.rol(res, 2)) == 0b1001:
         raise Success
Example #7
0
 def bitmap_rolX_size():
     res = bitmap.new(0b0110, 4)
     if bitmap.size(bitmap.rol(res, 8)) == 4:
         raise Success
Example #8
0
 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
Example #9
0
 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
Example #10
0
 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
Example #11
0
 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