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a0f4271497
This function was designed for haproxy while testing other functions in the past. Initially it was not planned to be used given the not very interesting numbers it showed on real URL data : it is not as smooth as the other ones. But later tests showed that the other ones are extremely sensible to the server count and the type of input data, especially DJB2 which must not be used on numeric input. So in fact this function is still a generally average performer and it can make sense to merge it in the end, as it can provide an alternative to sdbm+avalanche or djb2+avalanche for consistent hashing or when hashing on numeric data such as a source IP address or a visitor identifier in a URL parameter.
30 lines
1.0 KiB
C
30 lines
1.0 KiB
C
/*
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* include/common/hash.h
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* Macros for different hashing function.
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*
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* Copyright (C) 2000-2011 Willy Tarreau - w@1wt.eu
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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, version 2.1
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* exclusively.
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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; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _COMMON_HASH_H_
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#define _COMMON_HASH_H_
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unsigned long hash_djb2(const char *key, int len);
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unsigned long hash_wt6(const char *key, int len);
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unsigned long hash_sdbm(const char *key, int len);
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#endif /* _COMMON_HASH_H_ */
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