From ec688b4723a041044226358bcd4dd6e2da39da49 Mon Sep 17 00:00:00 2001 From: Luca Muscariello Date: Thu, 23 Feb 2017 17:01:02 +0100 Subject: Initial commit: cframework. Longbow and Libparc Change-Id: I90378dbd30da6033b20fb1f829b3b822cf366c59 Signed-off-by: Luca Muscariello --- libparc/parc/algol/parc_HashCode.c | 49 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100755 libparc/parc/algol/parc_HashCode.c (limited to 'libparc/parc/algol/parc_HashCode.c') diff --git a/libparc/parc/algol/parc_HashCode.c b/libparc/parc/algol/parc_HashCode.c new file mode 100755 index 00000000..8554429c --- /dev/null +++ b/libparc/parc/algol/parc_HashCode.c @@ -0,0 +1,49 @@ +/* + * Copyright (c) 2017 Cisco and/or its affiliates. + * 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. + */ + +/** + */ +#include + +#include + +#if PARCHashCodeSize == 64 +static const PARCHashCode _fnv1a_prime = 0x00000100000001B3ULL; +const PARCHashCode parcHashCode_InitialValue = 0xCBF29CE484222325ULL; +#else +static const PARCHashCode _fnv1a_prime = 0x01000193; +const PARCHashCode parcHashCode_InitialValue = 0x811C9DC5; +#endif + +PARCHashCode +parcHashCode_HashImpl(const uint8_t *memory, size_t length, PARCHashCode initialValue) +{ + // Standard FNV 64-bit prime: see http://www.isthe.com/chongo/tech/comp/fnv/#FNV-param + + PARCHashCode hash = initialValue; + + for (size_t i = 0; i < length; i++) { + hash = hash ^ memory[i]; + hash = hash * _fnv1a_prime; + } + + return hash; +} + +PARCHashCode +parcHashCode_HashHashCode(PARCHashCode initialValue, PARCHashCode update) +{ + return parcHashCode_HashImpl((uint8_t *) &update, sizeof(PARCHashCode), initialValue); +} -- cgit 1.2.3-korg