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// @flow
/* eslint-disable */
// Inspired by https://github.com/garycourt/murmurhash-js
// Ported from https://github.com/aappleby/smhasher/blob/61a0530f28277f2e850bfc39600ce61d02b518de/src/MurmurHash2.cpp#L37-L86
export default function murmur2(str: string) {
// 'm' and 'r' are mixing constants generated offline.
// They're not really 'magic', they just happen to work well.
// const m = 0x5bd1e995;
// const r = 24;
// Initialize the hash
var h = 0
// Mix 4 bytes at a time into the hash
var k,
i = 0,
len = str.length
for (; len >= 4; ++i, len -= 4) {
k =
(str.charCodeAt(i) & 0xff) |
((str.charCodeAt(++i) & 0xff) << 8) |
((str.charCodeAt(++i) & 0xff) << 16) |
((str.charCodeAt(++i) & 0xff) << 24)
k =
/* Math.imul(k, m): */
(k & 0xffff) * 0x5bd1e995 + (((k >>> 16) * 0xe995) << 16)
k ^= /* k >>> r: */ k >>> 24
h =
/* Math.imul(k, m): */
((k & 0xffff) * 0x5bd1e995 + (((k >>> 16) * 0xe995) << 16)) ^
/* Math.imul(h, m): */
((h & 0xffff) * 0x5bd1e995 + (((h >>> 16) * 0xe995) << 16))
}
// Handle the last few bytes of the input array
switch (len) {
case 3:
h ^= (str.charCodeAt(i + 2) & 0xff) << 16
case 2:
h ^= (str.charCodeAt(i + 1) & 0xff) << 8
case 1:
h ^= str.charCodeAt(i) & 0xff
h =
/* Math.imul(h, m): */
(h & 0xffff) * 0x5bd1e995 + (((h >>> 16) * 0xe995) << 16)
}
// Do a few final mixes of the hash to ensure the last few
// bytes are well-incorporated.
h ^= h >>> 13
h =
/* Math.imul(h, m): */
(h & 0xffff) * 0x5bd1e995 + (((h >>> 16) * 0xe995) << 16)
return ((h ^ (h >>> 15)) >>> 0).toString(36)
}