forked from enlightenment/efl
57 lines
1.6 KiB
Plaintext
57 lines
1.6 KiB
Plaintext
/* EINA - EFL data type library
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* Copyright (C) 2002-2008 Carsten Haitzler
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library;
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* if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef EINA_INLINE_HASH_X_
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#define EINA_INLINE_HASH_X_
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/*
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djb2 hash algorithm was first reported by dan bernstein, and was the old
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default hash function for evas.
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*/
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static inline int
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eina_hash_djb2(const char *key, int len)
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{
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unsigned int hash_num = 5381;
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const unsigned char *ptr;
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if (!key) return 0;
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for (ptr = (unsigned char *)key; len; ptr++, len--)
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hash_num = ((hash_num << 5) + hash_num) ^ *ptr; /* hash * 33 ^ c */
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return (int)hash_num;
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}
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static inline int
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eina_hash_djb2_len(const char *key, int *plen)
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{
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unsigned int hash_num = 5381;
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int len = 0;
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const unsigned char *ptr;
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if (!key) return 0;
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for (ptr = (unsigned char *)key; *ptr; ptr++, len++)
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hash_num = ((hash_num << 5) + hash_num) ^ *ptr; /* hash * 33 ^ c */
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*plen = len + 1;
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return (int)hash_num;
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}
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#endif
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