6c03a4e4d5
specified by OpenGroup here: https://pubs.opengroup.org/onlinepubs/009629399/toc.htm Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com> Change-Id: I3bc585e7f4d41f6c2ea70e170276ab0d0399b088
55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
/****************************************************************************
|
|
* libs/libc/uuid/lib_uuid_hash.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <uuid.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* uuid_hash
|
|
*
|
|
* Description:
|
|
* Generate a hash value.
|
|
*
|
|
* See also:
|
|
* http://www.opengroup.org/onlinepubs/009629399/uuid_hash.htm
|
|
*
|
|
****************************************************************************/
|
|
|
|
uint16_t uuid_hash(const uuid_t *u, uint32_t *status)
|
|
{
|
|
if (status)
|
|
{
|
|
*status = uuid_s_ok;
|
|
}
|
|
|
|
/* Use the most frequently changing bits in the UUID as the hash
|
|
* value. This should yield a good enough distribution...
|
|
*/
|
|
|
|
return u ? u->time_low & 0xffff : 0;
|
|
}
|