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_Hash.c | 144 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 144 insertions(+) create mode 100755 libparc/parc/algol/parc_Hash.c (limited to 'libparc/parc/algol/parc_Hash.c') diff --git a/libparc/parc/algol/parc_Hash.c b/libparc/parc/algol/parc_Hash.c new file mode 100755 index 00000000..1884c74c --- /dev/null +++ b/libparc/parc/algol/parc_Hash.c @@ -0,0 +1,144 @@ +/* + * 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. + */ + +/** + * This hash is based on FNV-1a, using different lengths. Please see the FNV-1a + * website for details on the algorithm: http://www.isthe.com/chongo/tech/comp/fnv + * + */ +#include + +#include +#include + +#include +#include + +struct parc_hash_32bits { + uint32_t accumulator; +}; + +parcObject_ExtendPARCObject(PARCHash32Bits, NULL, NULL, NULL, NULL, NULL, NULL, NULL); + +PARCHash32Bits * +parcHash32Bits_Create(void) +{ + PARCHash32Bits *result = parcObject_CreateInstance(PARCHash32Bits); + if (result != NULL) { + result->accumulator = 0; + } + + return result; +} + +PARCHash32Bits * +parcHash32Bits_Update(PARCHash32Bits *hash, const void *data, size_t length) +{ + hash->accumulator = parcHash32_Data_Cumulative(data, length, hash->accumulator); + return hash; +} + +PARCHash32Bits * +parcHash32Bits_UpdateUint32(PARCHash32Bits *hash, uint32_t value) +{ + hash->accumulator = parcHash32_Data_Cumulative(&value, sizeof(value), hash->accumulator); + return hash; +} + +uint32_t +parcHash32Bits_Hash(PARCHash32Bits *hash) +{ + return hash->accumulator; +} + +parcObject_ImplementAcquire(parcHash32Bits, PARCHash32Bits); + +parcObject_ImplementRelease(parcHash32Bits, PARCHash32Bits); + +/* + * Based on 64-bit FNV-1a + */ +uint64_t +parcHash64_Data(const void *data, size_t len) +{ + // Standard FNV 64-bit offset: see http://www.isthe.com/chongo/tech/comp/fnv/#FNV-param + const uint64_t fnv1a_offset = 0xCBF29CE484222325ULL; + return parcHash64_Data_Cumulative(data, len, fnv1a_offset); +} + +uint64_t +parcHash64_Data_Cumulative(const void *data, size_t len, uint64_t lastValue) +{ + // Standard FNV 64-bit prime: see http://www.isthe.com/chongo/tech/comp/fnv/#FNV-param + const uint64_t fnv1a_prime = 0x00000100000001B3ULL; + uint64_t hash = lastValue; + const char *chardata = data; + + for (size_t i = 0; i < len; i++) { + hash = hash ^ chardata[i]; + hash = hash * fnv1a_prime; + } + + return hash; +} + +uint64_t +parcHash64_Int64(uint64_t int64) +{ + return parcHash64_Data(&int64, sizeof(uint64_t)); +} + +uint64_t +parcHash64_Int32(uint32_t int32) +{ + return parcHash64_Data(&int32, sizeof(uint32_t)); +} + +uint32_t +parcHash32_Data(const void *data, size_t len) +{ + // Standard FNV 32-bit offset: see http://www.isthe.com/chongo/tech/comp/fnv/#FNV-param + const uint32_t fnv1a_offset = 0x811C9DC5; + return parcHash32_Data_Cumulative(data, len, fnv1a_offset); +} + +uint32_t +parcHash32_Data_Cumulative(const void *data, size_t len, uint32_t lastValue) +{ + // Standard FNV 32-bit prime: see http://www.isthe.com/chongo/tech/comp/fnv/#FNV-param + const uint32_t fnv1a_prime = 0x01000193; + uint32_t hash = lastValue; + + const char *chardata = data; + + for (size_t i = 0; i < len; i++) { + hash = hash ^ chardata[i]; + hash = hash * fnv1a_prime; + } + + return hash; +} + +uint32_t +parcHash32_Int64(uint64_t int64) +{ + return parcHash32_Data(&int64, sizeof(uint64_t)); +} + +uint32_t +parcHash32_Int32(uint32_t int32) +{ + return parcHash32_Data(&int32, sizeof(uint32_t)); +} -- cgit 1.2.3-korg