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# Copyright (C) 2015 Nippon Telegraph and Telephone Corporation.
# Copyright (C) 2015 YAMAMOTO Takashi <yamamoto at valinux co jp>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import base64
import struct
from os_ken.lib import addrconv
class TypeDescr(object):
pass
class IntDescr(TypeDescr):
def __init__(self, size):
self.size = size
def to_user(self, binary):
i = 0
for _ in range(self.size):
c = binary[:1]
i = i * 256 + ord(c)
binary = binary[1:]
return i
def from_user(self, i):
binary = b''
for _ in range(self.size):
binary = struct.Struct(">B").pack(i & 255) + binary
i //= 256
return binary
Int1 = IntDescr(1)
Int2 = IntDescr(2)
Int3 = IntDescr(3)
Int4 = IntDescr(4)
Int8 = IntDescr(8)
Int9 = IntDescr(9)
Int16 = IntDescr(16)
def _split_str(s, n):
"""
split string into list of strings by specified number.
"""
length = len(s)
return [s[i:i + n] for i in range(0, length, n)]
class IntDescrMlt(TypeDescr):
def __init__(self, length, num):
self.length = length
self.num = num
self.size = length * num
def to_user(self, binary):
assert len(binary) == self.size
lb = _split_str(binary, self.length)
li = []
for b in lb:
i = 0
for _ in range(self.length):
c = b[:1]
i = i * 256 + ord(c)
b = b[1:]
li.append(i)
return tuple(li)
def from_user(self, li):
assert len(li) == self.num
binary = b''
for i in li:
b = b''
for _ in range(self.length):
b = struct.Struct(">B").pack(i & 255) + b
i //= 256
binary += b
return binary
Int4Double = IntDescrMlt(4, 2)
class MacAddr(TypeDescr):
size = 6
to_user = addrconv.mac.bin_to_text
from_user = addrconv.mac.text_to_bin
class IPv4Addr(TypeDescr):
size = 4
to_user = addrconv.ipv4.bin_to_text
from_user = addrconv.ipv4.text_to_bin
class IPv6Addr(TypeDescr):
size = 16
to_user = addrconv.ipv6.bin_to_text
from_user = addrconv.ipv6.text_to_bin
class UnknownType(TypeDescr):
@staticmethod
def to_user(data):
return base64.b64encode(data).decode('ascii')
from_user = staticmethod(base64.b64decode)
class TypeDisp(object):
_TYPES = {}
_REV_TYPES = None
_UNKNOWN_TYPE = None
@classmethod
def register_unknown_type(cls):
def _register_type(subcls):
cls._UNKNOWN_TYPE = subcls
return subcls
return _register_type
@classmethod
def register_type(cls, type_):
cls._TYPES = cls._TYPES.copy()
def _register_type(subcls):
cls._TYPES[type_] = subcls
cls._REV_TYPES = None
return subcls
return _register_type
@classmethod
def _lookup_type(cls, type_):
try:
return cls._TYPES[type_]
except KeyError:
return cls._UNKNOWN_TYPE
@classmethod
def _rev_lookup_type(cls, targ_cls):
if cls._REV_TYPES is None:
rev = dict((v, k) for k, v in cls._TYPES.items())
cls._REV_TYPES = rev
return cls._REV_TYPES[targ_cls]
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