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|
const std = @import("std");
const builtin = @import("builtin");
const testing = std.testing;
const native_endian = builtin.target.cpu.arch.endian();
const default_seed: u32 = 0xc70f6907;
pub const Murmur2_32 = struct {
const Self = @This();
pub fn hash(str: []const u8) u32 {
return @call(.always_inline, Self.hashWithSeed, .{ str, default_seed });
}
pub fn hashWithSeed(str: []const u8, seed: u32) u32 {
const m: u32 = 0x5bd1e995;
const len = @truncate(u32, str.len);
var h1: u32 = seed ^ len;
for (@ptrCast([*]align(1) const u32, str.ptr)[0..(len >> 2)]) |v| {
var k1: u32 = v;
if (native_endian == .Big)
k1 = @byteSwap(k1);
k1 *%= m;
k1 ^= k1 >> 24;
k1 *%= m;
h1 *%= m;
h1 ^= k1;
}
const offset = len & 0xfffffffc;
const rest = len & 3;
if (rest >= 3) {
h1 ^= @intCast(u32, str[offset + 2]) << 16;
}
if (rest >= 2) {
h1 ^= @intCast(u32, str[offset + 1]) << 8;
}
if (rest >= 1) {
h1 ^= @intCast(u32, str[offset + 0]);
h1 *%= m;
}
h1 ^= h1 >> 13;
h1 *%= m;
h1 ^= h1 >> 15;
return h1;
}
pub fn hashUint32(v: u32) u32 {
return @call(.always_inline, Self.hashUint32WithSeed, .{ v, default_seed });
}
pub fn hashUint32WithSeed(v: u32, seed: u32) u32 {
const m: u32 = 0x5bd1e995;
const len: u32 = 4;
var h1: u32 = seed ^ len;
var k1: u32 = undefined;
k1 = v *% m;
k1 ^= k1 >> 24;
k1 *%= m;
h1 *%= m;
h1 ^= k1;
h1 ^= h1 >> 13;
h1 *%= m;
h1 ^= h1 >> 15;
return h1;
}
pub fn hashUint64(v: u64) u32 {
return @call(.always_inline, Self.hashUint64WithSeed, .{ v, default_seed });
}
pub fn hashUint64WithSeed(v: u64, seed: u32) u32 {
const m: u32 = 0x5bd1e995;
const len: u32 = 8;
var h1: u32 = seed ^ len;
var k1: u32 = undefined;
k1 = @truncate(u32, v) *% m;
k1 ^= k1 >> 24;
k1 *%= m;
h1 *%= m;
h1 ^= k1;
k1 = @truncate(u32, v >> 32) *% m;
k1 ^= k1 >> 24;
k1 *%= m;
h1 *%= m;
h1 ^= k1;
h1 ^= h1 >> 13;
h1 *%= m;
h1 ^= h1 >> 15;
return h1;
}
};
pub const Murmur2_64 = struct {
const Self = @This();
pub fn hash(str: []const u8) u64 {
return @call(.always_inline, Self.hashWithSeed, .{ str, default_seed });
}
pub fn hashWithSeed(str: []const u8, seed: u64) u64 {
const m: u64 = 0xc6a4a7935bd1e995;
var h1: u64 = seed ^ (@as(u64, str.len) *% m);
for (@ptrCast([*]align(1) const u64, str.ptr)[0..str.len / 8]) |v| {
var k1: u64 = v;
if (native_endian == .Big)
k1 = @byteSwap(k1);
k1 *%= m;
k1 ^= k1 >> 47;
k1 *%= m;
h1 ^= k1;
h1 *%= m;
}
const rest = str.len & 7;
const offset = str.len - rest;
if (rest > 0) {
var k1: u64 = 0;
@memcpy(@ptrCast([*]u8, &k1)[0..rest], str[offset..]);
if (native_endian == .Big)
k1 = @byteSwap(k1);
h1 ^= k1;
h1 *%= m;
}
h1 ^= h1 >> 47;
h1 *%= m;
h1 ^= h1 >> 47;
return h1;
}
pub fn hashUint32(v: u32) u64 {
return @call(.always_inline, Self.hashUint32WithSeed, .{ v, default_seed });
}
pub fn hashUint32WithSeed(v: u32, seed: u64) u64 {
const m: u64 = 0xc6a4a7935bd1e995;
const len: u64 = 4;
var h1: u64 = seed ^ (len *% m);
var k1: u64 = v;
h1 ^= k1;
h1 *%= m;
h1 ^= h1 >> 47;
h1 *%= m;
h1 ^= h1 >> 47;
return h1;
}
pub fn hashUint64(v: u64) u64 {
return @call(.always_inline, Self.hashUint64WithSeed, .{ v, default_seed });
}
pub fn hashUint64WithSeed(v: u64, seed: u64) u64 {
const m: u64 = 0xc6a4a7935bd1e995;
const len: u64 = 8;
var h1: u64 = seed ^ (len *% m);
var k1: u64 = undefined;
k1 = v *% m;
k1 ^= k1 >> 47;
k1 *%= m;
h1 ^= k1;
h1 *%= m;
h1 ^= h1 >> 47;
h1 *%= m;
h1 ^= h1 >> 47;
return h1;
}
};
pub const Murmur3_32 = struct {
const Self = @This();
fn rotl32(x: u32, comptime r: u32) u32 {
return (x << r) | (x >> (32 - r));
}
pub fn hash(str: []const u8) u32 {
return @call(.always_inline, Self.hashWithSeed, .{ str, default_seed });
}
pub fn hashWithSeed(str: []const u8, seed: u32) u32 {
const c1: u32 = 0xcc9e2d51;
const c2: u32 = 0x1b873593;
const len = @truncate(u32, str.len);
var h1: u32 = seed;
for (@ptrCast([*]align(1) const u32, 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 ^= @intCast(u32, str[offset + 2]) << 16;
}
if (rest >= 2) {
k1 ^= @intCast(u32, str[offset + 1]) << 8;
}
if (rest >= 1) {
k1 ^= @intCast(u32, 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;
}
pub fn hashUint32(v: u32) u32 {
return @call(.always_inline, Self.hashUint32WithSeed, .{ v, default_seed });
}
pub fn hashUint32WithSeed(v: u32, seed: u32) u32 {
const c1: u32 = 0xcc9e2d51;
const c2: u32 = 0x1b873593;
const len: u32 = 4;
var h1: u32 = seed;
var k1: u32 = undefined;
k1 = v *% c1;
k1 = rotl32(k1, 15);
k1 *%= c2;
h1 ^= k1;
h1 = rotl32(h1, 13);
h1 *%= 5;
h1 +%= 0xe6546b64;
h1 ^= len;
h1 ^= h1 >> 16;
h1 *%= 0x85ebca6b;
h1 ^= h1 >> 13;
h1 *%= 0xc2b2ae35;
h1 ^= h1 >> 16;
return h1;
}
pub fn hashUint64(v: u64) u32 {
return @call(.always_inline, Self.hashUint64WithSeed, .{ v, default_seed });
}
pub fn hashUint64WithSeed(v: u64, seed: u32) u32 {
const c1: u32 = 0xcc9e2d51;
const c2: u32 = 0x1b873593;
const len: u32 = 8;
var h1: u32 = seed;
var k1: u32 = undefined;
k1 = @truncate(u32, v) *% c1;
k1 = rotl32(k1, 15);
k1 *%= c2;
h1 ^= k1;
h1 = rotl32(h1, 13);
h1 *%= 5;
h1 +%= 0xe6546b64;
k1 = @truncate(u32, v >> 32) *% c1;
k1 = rotl32(k1, 15);
k1 *%= c2;
h1 ^= k1;
h1 = rotl32(h1, 13);
h1 *%= 5;
h1 +%= 0xe6546b64;
h1 ^= len;
h1 ^= h1 >> 16;
h1 *%= 0x85ebca6b;
h1 ^= h1 >> 13;
h1 *%= 0xc2b2ae35;
h1 ^= h1 >> 16;
return h1;
}
};
fn SMHasherTest(comptime hash_fn: anytype, comptime hashbits: u32) u32 {
const hashbytes = hashbits / 8;
var key: [256]u8 = [1]u8{0} ** 256;
var hashes: [hashbytes * 256]u8 = [1]u8{0} ** (hashbytes * 256);
var i: u32 = 0;
while (i < 256) : (i += 1) {
key[i] = @truncate(u8, i);
var h = hash_fn(key[0..i], 256 - i);
if (native_endian == .Big)
h = @byteSwap(h);
@memcpy(hashes[i * hashbytes..][0..hashbytes], @ptrCast([*]u8, &h));
}
return @truncate(u32, hash_fn(&hashes, 0));
}
test "murmur2_32" {
try testing.expectEqual(SMHasherTest(Murmur2_32.hashWithSeed, 32), 0x27864C1E);
var v0: u32 = 0x12345678;
var v1: u64 = 0x1234567812345678;
var v0le: u32 = v0;
var v1le: u64 = v1;
if (native_endian == .Big) {
v0le = @byteSwap(v0le);
v1le = @byteSwap(v1le);
}
try testing.expectEqual(Murmur2_32.hash(@ptrCast([*]u8, &v0le)[0..4]), Murmur2_32.hashUint32(v0));
try testing.expectEqual(Murmur2_32.hash(@ptrCast([*]u8, &v1le)[0..8]), Murmur2_32.hashUint64(v1));
}
test "murmur2_64" {
try std.testing.expectEqual(SMHasherTest(Murmur2_64.hashWithSeed, 64), 0x1F0D3804);
var v0: u32 = 0x12345678;
var v1: u64 = 0x1234567812345678;
var v0le: u32 = v0;
var v1le: u64 = v1;
if (native_endian == .Big) {
v0le = @byteSwap(v0le);
v1le = @byteSwap(v1le);
}
try testing.expectEqual(Murmur2_64.hash(@ptrCast([*]u8, &v0le)[0..4]), Murmur2_64.hashUint32(v0));
try testing.expectEqual(Murmur2_64.hash(@ptrCast([*]u8, &v1le)[0..8]), Murmur2_64.hashUint64(v1));
}
test "murmur3_32" {
try std.testing.expectEqual(SMHasherTest(Murmur3_32.hashWithSeed, 32), 0xB0F57EE3);
var v0: u32 = 0x12345678;
var v1: u64 = 0x1234567812345678;
var v0le: u32 = v0;
var v1le: u64 = v1;
if (native_endian == .Big) {
v0le = @byteSwap(v0le);
v1le = @byteSwap(v1le);
}
try testing.expectEqual(Murmur3_32.hash(@ptrCast([*]u8, &v0le)[0..4]), Murmur3_32.hashUint32(v0));
try testing.expectEqual(Murmur3_32.hash(@ptrCast([*]u8, &v1le)[0..8]), Murmur3_32.hashUint64(v1));
}
|
