72a06f6f60
A motivation of this change is a better modularity. I.e. Make packet lib independent from ofproto. Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
33 lines
1.0 KiB
Python
33 lines
1.0 KiB
Python
# Copyright (C) 2011, 2012 Nippon Telegraph and Telephone Corporation.
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# Copyright (C) 2011 Isaku Yamahata <yamahata at valinux co jp>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import struct
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def msg_pack_into(fmt, buf, offset, *args):
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if len(buf) < offset:
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buf += bytearray(offset - len(buf))
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if len(buf) == offset:
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buf += struct.pack(fmt, *args)
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return
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needed_len = offset + struct.calcsize(fmt)
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if len(buf) < needed_len:
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buf += bytearray(needed_len - len(buf))
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struct.pack_into(fmt, buf, offset, *args)
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