Source
pub fn hashWithSeed(str: []const u8, seed: u32) u32 {
const c1: u32 = 0xcc9e2d51;
const c2: u32 = 0x1b873593;
const len: u32 = @truncate(str.len);
var h1: u32 = seed;
for (@as([*]align(1) const u32, @ptrCast(str.ptr))[0..(len >> 2)]) |v| {
var k1: u32 = v;
if (native_endian == .big)
k1 = @byteSwap(k1);
k1 *%= c1;
k1 = rotl32(k1, 15);
k1 *%= c2;
h1 ^= k1;
h1 = rotl32(h1, 13);
h1 *%= 5;
h1 +%= 0xe6546b64;
}
{
var k1: u32 = 0;
const offset = len & 0xfffffffc;
const rest = len & 3;
if (rest == 3) {
k1 ^= @as(u32, @intCast(str[offset + 2])) << 16;
}
if (rest >= 2) {
k1 ^= @as(u32, @intCast(str[offset + 1])) << 8;
}
if (rest >= 1) {
k1 ^= @as(u32, @intCast(str[offset + 0]));
k1 *%= c1;
k1 = rotl32(k1, 15);
k1 *%= c2;
h1 ^= k1;
}
}
h1 ^= len;
h1 ^= h1 >> 16;
h1 *%= 0x85ebca6b;
h1 ^= h1 >> 13;
h1 *%= 0xc2b2ae35;
h1 ^= h1 >> 16;
return h1;
}