From f52207a45ca9e7cfbe431f4ffff79b3fdbcf3a37 Mon Sep 17 00:00:00 2001 From: Garima Singh Date: Mon, 30 Mar 2020 00:31:24 +0000 Subject: bloom.c: add the murmur3 hash implementation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In preparation for computing changed paths Bloom filters, implement the Murmur3 hash algorithm as described in [1]. It hashes the given data using the given seed and produces a uniformly distributed hash value. [1] https://en.wikipedia.org/wiki/MurmurHash#Algorithm Helped-by: Derrick Stolee Helped-by: Szeder Gábor Reviewed-by: Jakub Narębski Signed-off-by: Garima Singh Signed-off-by: Junio C Hamano --- bloom.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) create mode 100644 bloom.h (limited to 'bloom.h') diff --git a/bloom.h b/bloom.h new file mode 100644 index 0000000000..d0fcc5f0aa --- /dev/null +++ b/bloom.h @@ -0,0 +1,13 @@ +#ifndef BLOOM_H +#define BLOOM_H + +/* + * Calculate the murmur3 32-bit hash value for the given data + * using the given seed. + * Produces a uniformly distributed hash value. + * Not considered to be cryptographically secure. + * Implemented as described in https://en.wikipedia.org/wiki/MurmurHash#Algorithm + */ +uint32_t murmur3_seeded(uint32_t seed, const char *data, size_t len); + +#endif \ No newline at end of file -- cgit v1.2.3