// Copyright (c) 2018, Rene Lergner - @Heathcliff74xda
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// Some of the classes and functions in this file were found online.
// Where possible the original authors are referenced.

using System;
using System.Text;

namespace WPinternals.HelperClasses
{
    public static class Converter
    {
        public static string ConvertHexToString(byte[] Bytes, string Separator)
        {
            StringBuilder s = new(1000);
            for (int i = Bytes.GetLowerBound(0); i <= Bytes.GetUpperBound(0); i++)
            {
                if (i != Bytes.GetLowerBound(0))
                {
                    s.Append(Separator);
                }

                s.Append(Bytes[i].ToString("X2"));
            }
            return s.ToString();
        }

        public static byte[] ConvertStringToHex(string HexString)
        {
            if (HexString.Length % 2 == 1)
            {
                throw new Exception("The binary key cannot have an odd number of digits");
            }

            byte[] arr = new byte[HexString.Length >> 1];

            for (int i = 0; i < HexString.Length >> 1; ++i)
            {
                arr[i] = (byte)((GetHexVal(HexString[i << 1]) << 4) + GetHexVal(HexString[(i << 1) + 1]));
            }

            return arr;
        }

        public static int GetHexVal(char hex)
        {
            int val = hex;
            //For uppercase A-F letters:
            //return val - (val < 58 ? 48 : 55);
            //For lowercase a-f letters:
            //return val - (val < 58 ? 48 : 87);
            //Or the two combined, but a bit slower:
            return val - (val < 58 ? 48 : val < 97 ? 55 : 87);
        }
    }
}