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author | Lorry Tar Creator <lorry-tar-importer@lorry> | 2017-02-17 21:28:53 +0000 |
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committer | Lorry Tar Creator <lorry-tar-importer@lorry> | 2017-02-17 21:28:53 +0000 |
commit | 189d7eb970b025c570c7ccce916759083373bdde (patch) | |
tree | f4f7c3a71ecc7851a8a7b86206bbb202b5cab551 /murmurhashneutral2.c | |
download | ccache-tarball-189d7eb970b025c570c7ccce916759083373bdde.tar.gz |
ccache-3.3.4HEADccache-3.3.4master
Diffstat (limited to 'murmurhashneutral2.c')
-rw-r--r-- | murmurhashneutral2.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/murmurhashneutral2.c b/murmurhashneutral2.c new file mode 100644 index 0000000..53319df --- /dev/null +++ b/murmurhashneutral2.c @@ -0,0 +1,44 @@ +// MurmurHashNeutral2, by Austin Appleby. Released to the public domain. See +// <http://murmurhash.googlepages.com>. + +#include "murmurhashneutral2.h" + +unsigned int +murmurhashneutral2(const void *key, int len, unsigned int seed) +{ + const unsigned int m = 0x5bd1e995; + const int r = 24; + unsigned int h = seed ^ len; + const unsigned char *data = (const unsigned char *)key; + + while (len >= 4) { + unsigned int k = data[0]; + k |= ((unsigned int) data[1]) << 8; + k |= ((unsigned int) data[2]) << 16; + k |= ((unsigned int) data[3]) << 24; + + k *= m; + k ^= k >> r; + k *= m; + + h *= m; + h ^= k; + + data += 4; + len -= 4; + } + + switch (len) + { + case 3: h ^= ((unsigned int) data[2]) << 16; + case 2: h ^= ((unsigned int) data[1]) << 8; + case 1: h ^= ((unsigned int) data[0]); + h *= m; + }; + + h ^= h >> 13; + h *= m; + h ^= h >> 15; + + return h; +} |