diff options
author | Bastien Montagne <montagne29@wanadoo.fr> | 2014-11-14 13:00:10 +0300 |
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committer | Bastien Montagne <montagne29@wanadoo.fr> | 2014-11-14 13:00:26 +0300 |
commit | 64c0c13e6e08c51e92504631468db864f553d9b5 (patch) | |
tree | 5903262689a45defda7a98782656964bdaa50f6b /source/blender/blenlib/BLI_hash_md5.h | |
parent | c8a9764987a8c1e7ea0093e8a0b028a65af6ee33 (diff) |
Add Murmur2A hashing feature to BLI
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
Diffstat (limited to 'source/blender/blenlib/BLI_hash_md5.h')
-rw-r--r-- | source/blender/blenlib/BLI_hash_md5.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/source/blender/blenlib/BLI_hash_md5.h b/source/blender/blenlib/BLI_hash_md5.h new file mode 100644 index 00000000000..cab3671a5ca --- /dev/null +++ b/source/blender/blenlib/BLI_hash_md5.h @@ -0,0 +1,46 @@ +/* + * ***** BEGIN GPL LICENSE BLOCK ***** + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * ***** END GPL LICENSE BLOCK ***** + */ + +#ifndef __BLI_MD5_H__ +#define __BLI_MD5_H__ + +/** \file BLI_hash_md5.h + * \ingroup bli + */ + +#include <stdio.h> +#include <stdlib.h> + +/* Compute MD5 message digest for LEN bytes beginning at BUFFER. The + * result is always in little endian byte order, so that a byte-wise + * output yields to the wanted ASCII representation of the message + * digest. */ + +void *md5_buffer(const char *buffer, size_t len, void *resblock); + +/* Compute MD5 message digest for bytes read from STREAM. The + * resulting message digest number will be written into the 16 bytes + * beginning at RESBLOCK. */ + +int md5_stream(FILE *stream, void *resblock); + +char *md5_to_hexdigest(void *resblock, char r_hex_digest[33]); + +#endif /* __BLI_MD5_H__ */ |