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aee017903b
Add a quick header which calculates 64bit hashes by calculating the crc of the two halves of a byte region. Signed-off-by: Zach Brown <zab@versity.com>
16 lines
335 B
C
16 lines
335 B
C
#ifndef _SCOUTFS_HASH_H_
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#define _SCOUTFS_HASH_H_
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#include <linux/crc32c.h>
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/* XXX replace with xxhash */
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static inline u64 scoutfs_hash64(const void *data, unsigned int len)
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{
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unsigned int half = (len + 1) / 2;
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return crc32c(~0, data, half) |
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((u64)crc32c(~0, data + len - half, half) << 32);
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}
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#endif
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