From 64c0c13e6e08c51e92504631468db864f553d9b5 Mon Sep 17 00:00:00 2001 From: Bastien Montagne Date: Fri, 14 Nov 2014 11:00:10 +0100 Subject: 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 --- source/blender/blenlib/BLI_hash_md5.h | 46 +++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 source/blender/blenlib/BLI_hash_md5.h (limited to 'source/blender/blenlib/BLI_hash_md5.h') 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 +#include + +/* 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__ */ -- cgit v1.2.3