Bastien Montagne
64c0c13e6e
Murmur2a is a very fast hashing function generation int32 hashes. It also features a very good distribution of generated hashes. However, it is not endianness-agnostic, meaning it will usually generate different hashes for a same key on big- and little-endian architectures. Consequently, **it shall not be used to generate persistent hashes** (never store them in .blend file e.g.). This implementation supports incremental hashing, and is a direct adaptation of reference implementation (in c++): https://smhasher.googlecode.com/svn-history/r130/trunk/MurmurHash2.cpp That cpp code was also used to generate reference values in gtests file. Reviewers: sergey, campbellbarton Reviewed By: campbellbarton Projects: #bf_blender Differential Revision: https://developer.blender.org/D892
46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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#ifndef __BLI_MM2A_H__
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#define __BLI_MM2A_H__
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/** \file BLI_hash_mm2a.h
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* \ingroup bli
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*/
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#include "BLI_sys_types.h"
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typedef struct BLI_HashMurmur2A {
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uint32_t hash;
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uint32_t tail;
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uint32_t count;
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uint32_t size;
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} BLI_HashMurmur2A;
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void BLI_hash_mm2a_init(BLI_HashMurmur2A *mm2, uint32_t seed);
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void BLI_hash_mm2a_add(BLI_HashMurmur2A *mm2, const unsigned char *data, size_t len);
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void BLI_hash_mm2a_add_int(BLI_HashMurmur2A *mm2, int data);
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uint32_t BLI_hash_mm2a_end(BLI_HashMurmur2A *mm2);
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#endif /* __BLI_MM2A_H__ */
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