/// <summary>
/// The compare.
/// </summary>
/// <param name="x">
/// The x.
/// </param>
/// <param name="y">
/// The y.
/// </param>
/// <param name="length">
/// The length.
/// </param>
/// <returns>
/// The <see cref="int"/>.
/// </returns>
public int Compare(byte[] x, byte[] y, int length)
{
var common = new CommonArray();
common.ByteArray = x;
ulong[] array1 = common.UInt64Array;
common.ByteArray = y;
ulong[] array2 = common.UInt64Array;
int len = length >> 3;
for (int i = 0; i < len; i++)
{
var v1 = array1[i];
var v2 = array2[i];
if (v1 != v2)
{
for (int j = i << 3; ; j++)
{
byte b1 = x[j];
byte b2 = y[j];
if (b1 < b2)
{
return(-1);
}
if (b1 > b2)
{
return(1);
}
}
}
}
int index = len << 3;
switch (length & 7)
{
case 7:
{
var b1 = x[index];
var b2 = y[index];
if (b1 < b2)
{
return(-1);
}
if (b1 > b2)
{
return(1);
}
index++;
goto case 6;
}
case 6:
{
var b1 = x[index];
var b2 = y[index];
if (b1 < b2)
{
return(-1);
}
if (b1 > b2)
{
return(1);
}
index++;
goto case 5;
}
case 5:
{
var b1 = x[index];
var b2 = y[index];
if (b1 < b2)
{
return(-1);
}
if (b1 > b2)
{
return(1);
}
index++;
goto case 4;
}
case 4:
{
var b1 = x[index];
var b2 = y[index];
if (b1 < b2)
{
return(-1);
}
if (b1 > b2)
{
return(1);
}
index++;
goto case 3;
}
case 3:
{
var b1 = x[index];
var b2 = y[index];
if (b1 < b2)
{
return(-1);
}
if (b1 > b2)
{
return(1);
}
index++;
goto case 2;
}
case 2:
{
var b1 = x[index];
var b2 = y[index];
if (b1 < b2)
{
return(-1);
}
if (b1 > b2)
{
return(1);
}
index++;
goto case 1;
}
case 1:
{
var b1 = x[index];
var b2 = y[index];
if (b1 < b2)
{
return(-1);
}
if (b1 > b2)
{
return(1);
}
break;
}
}
return(0);
}
/// <summary>
/// The equals.
/// </summary>
/// <param name="x">
/// The x.
/// </param>
/// <param name="y">
/// The y.
/// </param>
/// <returns>
/// The <see cref="bool"/>.
/// </returns>
public bool Equals(byte[] x, byte[] y)
{
if (x.Length != y.Length)
{
return(false);
}
CommonArray common = new CommonArray();
common.ByteArray = x;
ulong[] array1 = common.UInt64Array;
common.ByteArray = y;
ulong[] array2 = common.UInt64Array;
int length = x.Length;
int len = length >> 3;
int remainder = length & 7;
int i = len;
if (remainder > 0)
{
int shift = sizeof(ulong) - remainder;
if ((array1[i] << shift) >> shift != (array2[i] << shift) >> shift)
{
return(false);
}
}
i--;
while (i >= 7)
{
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)
{
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)
{
if (array1[i] != array2[i] ||
array1[i - 1] != array2[i - 1])
{
return(false);
}
i -= 2;
}
if (i >= 0)
{
if (array1[i] != array2[i])
{
return(false);
}
//i -= 1;
}
return(true);
}
