private void Body(byte[] data, int start, int length)
{
int remainder = length & 15;
int blocks = length / 16;
unsafe
{
fixed(byte *d = &data[start])
{
ulong *current = (ulong *)d;
while (blocks-- > 0)
{
// a variant of original algorithm optimized for processor instruction pipelining
H1 ^= (*current++ *C1).RotateLeft(31) * C2;
H1 = (H1.RotateLeft(27) + H2) * 5 + 0x52dce729;
H2 ^= (*current++ *C2).RotateLeft(33) * C1;
H2 = (H2.RotateLeft(31) + H1) * 5 + 0x38495ab5;
}
if (remainder > 0)
{
Tail(d + (length - remainder), remainder);
}
}
}
}
private void Body(byte[] data, int start, int length)
{
int remainder = length & 15;
int alignedLength = start + (length - remainder);
for (int i = start; i < alignedLength; i += 16)
{
uint k1 = data.ToUInt32(i),
k2 = data.ToUInt32(i + 4),
k3 = data.ToUInt32(i + 8),
k4 = data.ToUInt32(i + 12);
H1 ^= (k1 * C1).RotateLeft(15) * C2;
H1 = (H1.RotateLeft(19) + H2) * 5 + 0x561ccd1b;
H2 ^= (k2 * C2).RotateLeft(16) * C3;
H2 = (H2.RotateLeft(17) + H3) * 5 + 0x0bcaa747;
H3 ^= (k3 * C3).RotateLeft(17) * C4;
H3 = (H3.RotateLeft(15) + H4) * 5 + 0x96cd1c35;
H4 ^= (k4 * C4).RotateLeft(18) * C1;
H4 = (H4.RotateLeft(13) + H1) * 5 + 0x32ac3b17;
}
if (remainder > 0)
{
Tail(data, alignedLength, remainder);
}
}
private void Body(ReadOnlySpan <byte> source)
{
if (source.Length == 0)
{
return;
}
var remainder = source.Length & 15;
var blocks = 2 * (source.Length / 16);
if (blocks > 0)
{
var ulongSource = MemoryMarshal.Cast <byte, ulong>(source);
for (var block = 0; block < blocks;)
{
H1 ^= (ulongSource[block++] * C1).RotateLeft(31) * C2;
H1 = ((H1.RotateLeft(27) + H2) * 5) + 0x52dce729;
H2 ^= (ulongSource[block++] * C2).RotateLeft(33) * C1;
H2 = ((H2.RotateLeft(31) + H1) * 5) + 0x38495ab5;
}
}
if (remainder > 0)
{
Tail(source.Slice(8 * blocks));
}
}
private void Body(byte[] data, int start, int length)
{
if (length == 0)
{
return;
}
int remainder = length & 15;
int blocks = length / 16;
unsafe
{
fixed(byte *d = &data[start])
{
// grab a reference to blocks
uint *b = (uint *)d;
while (blocks-- > 0)
{
// K1 - consume first integer
H1 ^= (*b++ *C1).RotateLeft(15) * C2;
H1 = (H1.RotateLeft(19) + H2) * 5 + 0x561ccd1b;
// K2 - consume second integer
H2 ^= (*b++ *C2).RotateLeft(16) * C3;
H2 = (H2.RotateLeft(17) + H3) * 5 + 0x0bcaa747;
// K3 - consume third integer
H3 ^= (*b++ *C3).RotateLeft(17) * C4;
H3 = (H3.RotateLeft(15) + H4) * 5 + 0x96cd1c35;
// K4 - consume fourth integer
H4 ^= (*b++ *C4).RotateLeft(18) * C1;
H4 = (H4.RotateLeft(13) + H1) * 5 + 0x32ac3b17;
}
if (remainder > 0)
{
Tail(d + (length - remainder), remainder);
}
}
}
}
private void Body(ReadOnlySpan <byte> source)
{
if (source.Length == 0)
{
return;
}
var remainder = source.Length & 15;
var blocks = 4 * (source.Length / 16);
if (blocks > 0)
{
var uintSource = MemoryMarshal.Cast <byte, uint>(source);
var block = 0;
while (block < blocks)
{
var k1 = uintSource[block++];
var k2 = uintSource[block++];
var k3 = uintSource[block++];
var k4 = uintSource[block++];
H1 ^= (k1 * C1).RotateLeft(15) * C2;
H1 = ((H1.RotateLeft(19) + H2) * 5) + 0x561ccd1b;
H2 ^= (k2 * C2).RotateLeft(16) * C3;
H2 = ((H2.RotateLeft(17) + H3) * 5) + 0x0bcaa747;
H3 ^= (k3 * C3).RotateLeft(17) * C4;
H3 = ((H3.RotateLeft(15) + H4) * 5) + 0x96cd1c35;
H4 ^= (k4 * C4).RotateLeft(18) * C1;
H4 = ((H4.RotateLeft(13) + H1) * 5) + 0x32ac3b17;
}
}
if (remainder > 0)
{
Tail(source.Slice(4 * blocks));
}
}
public override unsafe void TransformBlock(ReadOnlyMemory <byte> memory)
{
var length = memory.Length;
if (length == 0)
{
return;
}
base.TransformBlock(memory);
int remainder = length & 15;
int blocks = length / 16;
using var hMemory = memory.Pin();
byte *d = (byte *)hMemory.Pointer;
uint *current = (uint *)d;
while (blocks-- > 0)
{
// K1 - consume first integer
H1 ^= (*current++ *C1).RotateLeft(15) * C2;
H1 = (H1.RotateLeft(19) + H2) * 5 + 0x561ccd1b;
// K2 - consume second integer
H2 ^= (*current++ *C2).RotateLeft(16) * C3;
H2 = (H2.RotateLeft(17) + H3) * 5 + 0x0bcaa747;
// K3 - consume third integer
H3 ^= (*current++ *C3).RotateLeft(17) * C4;
H3 = (H3.RotateLeft(15) + H4) * 5 + 0x96cd1c35;
// K4 - consume fourth integer
H4 ^= (*current++ *C4).RotateLeft(18) * C1;
H4 = (H4.RotateLeft(13) + H1) * 5 + 0x32ac3b17;
}
if (remainder > 0)
{
// create our keys and initialize to 0
uint k1 = 0, k2 = 0, k3 = 0, k4 = 0;
byte *tail = d + (length - remainder);
// determine how many bytes we have left to work with based on length
switch (remainder)
{
case 15: k4 ^= (uint)tail[14] << 16; goto case 14;
case 14: k4 ^= (uint)tail[13] << 8; goto case 13;
case 13: k4 ^= (uint)tail[12] << 0; goto case 12;
case 12: k3 ^= (uint)tail[11] << 24; goto case 11;
case 11: k3 ^= (uint)tail[10] << 16; goto case 10;
case 10: k3 ^= (uint)tail[9] << 8; goto case 9;
case 9: k3 ^= (uint)tail[8] << 0; goto case 8;
case 8: k2 ^= (uint)tail[7] << 24; goto case 7;
case 7: k2 ^= (uint)tail[6] << 16; goto case 6;
case 6: k2 ^= (uint)tail[5] << 8; goto case 5;
case 5: k2 ^= (uint)tail[4] << 0; goto case 4;
case 4: k1 ^= (uint)tail[3] << 24; goto case 3;
case 3: k1 ^= (uint)tail[2] << 16; goto case 2;
case 2: k1 ^= (uint)tail[1] << 8; goto case 1;
case 1: k1 ^= (uint)tail[0] << 0; break;
}
H4 ^= (k4 * C4).RotateLeft(18) * C1;
H3 ^= (k3 * C3).RotateLeft(17) * C4;
H2 ^= (k2 * C2).RotateLeft(16) * C3;
H1 ^= (k1 * C1).RotateLeft(15) * C2;
}
}
