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Fix murmurhash for big-endian architectures.

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The murmurhash implementation tries to read a sequence of four bytes as
a single little-endian uint32 value. This does not work on e.g. Linux/s390x;
https://buildd.debian.org/status/fetch.php?pkg=kakoune&arch=s390x&ver=2021.11.08-1&stamp=1645975425&raw=0
This commit is contained in:
Peter Pentchev 2022-06-24 20:01:25 +03:00
parent 6565f6edd7
commit 085973a486
1 changed files with 4 additions and 0 deletions
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4
src/hash.cc
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@ -41,7 +41,11 @@ size_t hash_data(const char* input, size_t len)
for (ptrdiff_t i = -nblocks; i; ++i) for (ptrdiff_t i = -nblocks; i; ++i)
{ {
uint32_t key; uint32_t key;
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
memcpy(&key, blocks + 4*i, 4); memcpy(&key, blocks + 4*i, 4);
#else
key = blocks[4*i] + (blocks[4*i + 1] << 8) + (blocks[4*i + 2] << 16) + (blocks[4*i + 3] << 24);
#endif
key *= c1; key *= c1;
key = rotl(key, 15); key = rotl(key, 15);
key *= c2; key *= c2;