public static int GetHashCodeSimple(this byte[] buffer)
{
const int CONSTANT = 17;
unchecked {
int hashCode = 37;
ReinterpretArray common = new ReinterpretArray();
common.AsByteArray = buffer;
int[] array = common.AsInt32Array;
int length = buffer.Length;
int remainder = length & 3;
int len = length >> 2;
int i = 0;
while (i < len)
{
hashCode = CONSTANT * hashCode + array[i];
i++;
}
if (remainder > 0)
{
int shift = sizeof(uint) - remainder;
hashCode = CONSTANT * hashCode + ((array[i] << shift) >> shift);
}
return(hashCode);
}
}
public int Compare(byte[] x, byte[] y, int length)
{
if (x == null && y == null && length == 0)
{
return(0);
}
ReinterpretArray common = new ReinterpretArray();
common.AsByteArray = x;
ulong[] array1 = common.AsUInt64Array;
common.AsByteArray = y;
ulong[] array2 = common.AsUInt64Array;
int len = length >> 3;
int remainder = length & 7;
int i = len;
if (remainder > 0)
{
int shift = sizeof(ulong) - remainder;
var v1 = (array1[i] << shift) >> shift;
var v2 = (array2[i] << shift) >> shift;
if (v1 < v2)
{
return(-1);
}
if (v1 > v2)
{
return(1);
}
}
i--;
while (i >= 0)
{
var v1 = array1[i];
var v2 = array2[i];
if (v1 < v2)
{
return(-1);
}
if (v1 > v2)
{
return(1);
}
i--;
}
return(0);
}
public bool Equals(byte[] x, byte[] y)
{
if (x == null && y == null)
{
return(true);
}
if (x.Length != y.Length)
{
return(false);
}
ReinterpretArray common = new ReinterpretArray();
common.AsByteArray = x;
ulong[] array1 = common.AsUInt64Array;
common.AsByteArray = y;
ulong[] array2 = common.AsUInt64Array;
int length = x.Length;
int remainder = length & 7;
int len = length >> 3;
int i = 0;
while (i + 7 < len)
{
if (array1[i] != array2[i] ||
array1[i + 1] != array2[i + 1] ||
array1[i + 2] != array2[i + 2] ||
array1[i + 3] != array2[i + 3] ||
array1[i + 4] != array2[i + 4] ||
array1[i + 5] != array2[i + 5] ||
array1[i + 6] != array2[i + 6] ||
array1[i + 7] != array2[i + 7])
{
return(false);
}
i += 8;
}
if (i + 3 < len)
{
if (array1[i] != array2[i] ||
array1[i + 1] != array2[i + 1] ||
array1[i + 2] != array2[i + 2] ||
array1[i + 3] != array2[i + 3])
{
return(false);
}
i += 4;
}
if (i + 1 < len)
{
if (array1[i] != array2[i] ||
array1[i + 1] != array2[i + 1])
{
return(false);
}
i += 2;
}
if (i < len)
{
if (array1[i] != array2[i])
{
return(false);
}
i += 1;
}
if (remainder > 0)
{
int shift = sizeof(ulong) - remainder;
if ((array1[i] << shift) >> shift != (array2[i] << shift) >> shift)
{
return(false);
}
}
return(true);
}
