conversion.py

#!/usr/bin/python
"""
  (C) Copyright 2018 Intel Corporation.

  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.

  GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE
  The Government's rights to use, modify, reproduce, release, perform, display,
  or disclose this software are subject to the terms of the Apache License as
  provided in Contract No. B609815.
  Any reproduction of computer software, computer software documentation, or
  portions thereof marked with this legend must also reproduce the markings.
"""
import ctypes
import uuid

def c_uuid_to_str(uuid):
    """ utility function to convert a C uuid into a standard string format """
    uuid_str = '{:02X}{:02X}{:02X}{:02X}-{:02X}{:02X}-{:02X}{:02X}-{:02X}'\
               '{:02X}-{:02X}{:02X}{:02X}{:02X}{:02X}{:02X}'.format(
                   uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5],
                   uuid[6], uuid[7], uuid[8], uuid[9], uuid[10], uuid[11],
                   uuid[12], uuid[13], uuid[14], uuid[15])
    return uuid_str

def c_uuid(p_uuid, c_uuid):
    """ utility function to create a UUID in C format from a python UUID """
    hexstr = p_uuid.hex
    for i in range(0, 31, 2):
        c_uuid[i/2] = int(hexstr[i:i+2], 16)

def str_to_c_uuid(uuidstr):
    """ utility function to convert string format uuid to a C uuid """
    uuidstr2 = '{' + uuidstr + '}'
    puuid = uuid.UUID(uuidstr2)
    cuuid = (ctypes.c_ubyte * 16)()
    c_uuid(puuid, cuuid)
    return cuuid