64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/******************************************************************************
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*
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* Copyright (C) 2014 Google, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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#include <string.h>
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#include "osi/hash_functions.h"
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hash_index_t hash_function_naive(const void *key)
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{
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return (hash_index_t)key;
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}
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hash_index_t hash_function_integer(const void *key)
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{
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return ((hash_index_t)key) * 2654435761;
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}
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hash_index_t hash_function_pointer(const void *key)
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{
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return ((hash_index_t)key) * 2654435761;
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}
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hash_index_t hash_function_string(const void *key)
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{
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hash_index_t hash = 5381;
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const char *name = (const char *)key;
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size_t string_len = strlen(name);
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for (size_t i = 0; i < string_len; ++i) {
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hash = ((hash << 5) + hash ) + name[i];
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}
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return hash;
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}
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void hash_function_blob(const unsigned char *s, unsigned int len, hash_key_t h)
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{
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size_t j;
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while (len--) {
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j = sizeof(hash_key_t)-1;
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while (j) {
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h[j] = ((h[j] << 7) | (h[j-1] >> 1)) + h[j];
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--j;
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}
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h[0] = (h[0] << 7) + h[0] + *s++;
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}
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}
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