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using System;
using Org.BouncyCastle.Math.Raw;
namespace Org.BouncyCastle.Utilities
{
public abstract class Longs
{
public const int NumBits = 64;
public const int NumBytes = 8;
public static long Reverse(long i)
{
i = (long)Bits.BitPermuteStepSimple((ulong)i, 0x5555555555555555UL, 1);
i = (long)Bits.BitPermuteStepSimple((ulong)i, 0x3333333333333333UL, 2);
i = (long)Bits.BitPermuteStepSimple((ulong)i, 0x0F0F0F0F0F0F0F0FUL, 4);
return ReverseBytes(i);
}
[CLSCompliantAttribute(false)]
public static ulong Reverse(ulong i)
{
i = Bits.BitPermuteStepSimple(i, 0x5555555555555555UL, 1);
i = Bits.BitPermuteStepSimple(i, 0x3333333333333333UL, 2);
i = Bits.BitPermuteStepSimple(i, 0x0F0F0F0F0F0F0F0FUL, 4);
return ReverseBytes(i);
}
public static long ReverseBytes(long i)
{
return RotateLeft((long)((ulong)i & 0xFF000000FF000000UL), 8) |
RotateLeft((long)((ulong)i & 0x00FF000000FF0000UL), 24) |
RotateLeft((long)((ulong)i & 0x0000FF000000FF00UL), 40) |
RotateLeft((long)((ulong)i & 0x000000FF000000FFUL), 56);
}
[CLSCompliantAttribute(false)]
public static ulong ReverseBytes(ulong i)
{
return RotateLeft(i & 0xFF000000FF000000UL, 8) |
RotateLeft(i & 0x00FF000000FF0000UL, 24) |
RotateLeft(i & 0x0000FF000000FF00UL, 40) |
RotateLeft(i & 0x000000FF000000FFUL, 56);
}
public static long RotateLeft(long i, int distance)
{
return (i << distance) ^ (long)((ulong)i >> -distance);
}
[CLSCompliantAttribute(false)]
public static ulong RotateLeft(ulong i, int distance)
{
return (i << distance) ^ (i >> -distance);
}
public static long RotateRight(long i, int distance)
{
return (long)((ulong)i >> distance) ^ (i << -distance);
}
[CLSCompliantAttribute(false)]
public static ulong RotateRight(ulong i, int distance)
{
return (i >> distance) ^ (i << -distance);
}
}
}
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