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/*
* 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 <config.h>
#include <stdint.h>
#include <unistd.h>
#include <parc/algol/parc_Hash.h>
#include <parc/algol/parc_Object.h>
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));
}
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