components/bt/common/osi/hash_functions.c (ESP-IDF)

/****************************************************************************** * * Copyright (C) 2014 Google, Inc. * * 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 <string.h> #include "osi/hash_functions.h" hash_index_t hash_function_naive(const void *key) { return (hash_index_t)key; } hash_index_t hash_function_integer(const void *key) { return ((hash_index_t)key) * 2654435761; } hash_index_t hash_function_pointer(const void *key) { return ((hash_index_t)key) * 2654435761; } hash_index_t hash_function_string(const void *key) { hash_index_t hash = 5381; const char *name = (const char *)key; size_t string_len = strlen(name); for (size_t i = 0; i < string_len; ++i) { hash = ((hash << 5) + hash ) + name[i]; } return hash; } void hash_function_blob(const unsigned char *s, unsigned int len, hash_key_t h) { size_t j; while (len--) { j = sizeof(hash_key_t)-1; while (j) { h[j] = ((h[j] << 7) | (h[j-1] >> 1)) + h[j]; --j; } h[0] = (h[0] << 7) + h[0] + *s++; } }