HexConverter
using System.Runtime.CompilerServices;
namespace System
{
internal static class HexConverter
{
public enum Casing : uint
{
Upper = 0,
Lower = 8224
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void ToCharsBuffer(byte value, Span<char> buffer, int startingIndex = 0, Casing casing = Casing.Upper)
{
uint num = (uint)(((value & 240) << 4) + (value & 15) - 35209);
uint num2 = (uint)((int)((((0 - num) & 28784) >> 4) + num + 47545) | (int)casing);
buffer[startingIndex + 1] = (char)(num2 & 255);
buffer[startingIndex] = (char)(num2 >> 8);
}
public static void EncodeToUtf16(ReadOnlySpan<byte> bytes, Span<char> chars, Casing casing = Casing.Upper)
{
for (int i = 0; i < bytes.Length; i++) {
ToCharsBuffer(bytes[i], chars, i * 2, casing);
}
}
public unsafe static string ToString(ReadOnlySpan<byte> bytes, Casing casing = Casing.Upper)
{
return string.Create(bytes.Length * 2, ((IntPtr)(&bytes), casing), delegate(Span<char> chars, (IntPtr RosPtr, Casing casing) args) {
EncodeToUtf16(*(ReadOnlySpan<byte>*)(long)args.RosPtr, chars, args.casing);
});
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static int FromLowerChar(int c)
{
if ((uint)(c - 48) <= 9)
return c - 48;
if ((uint)(c - 97) <= 5)
return c - 97 + 10;
return 255;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool IsHexLowerChar(int c)
{
if ((uint)(c - 48) > 9)
return (uint)(c - 97) <= 5;
return true;
}
}
}