/*
Thor Server 2.0 Project - Codenamed "Stockholm"
Copyright 2008 - 2009 Joe Hegarty


This file is part of The Thor Server 2.0 Project - Codenamed "Stockholm".

The Thor Server 2.0 Project - Codenamed "Stockholm" is free software: you can 
redistribute it and/or modify it under the terms of the Microsoft Public License

The Thor Server Project is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Microsoft Public License for more details.

You should have received a copy of the Microsoft Public License
along with The Thor Server Project.  If not, see 
http://www.opensource.org/licenses/ms-pl.html
*/

using System;
using System.Text;

namespace StockholmLibrary.Net
{
    //------------------------------------
    public static class B64Encoding
    {
        //**********************************************
        public static byte[] EncodeInt(int value, int length)
        {
            byte[] result = new byte[length];
            for (int x = 1; x <= length; x++)
            {
                int offset = 6 * (length - x);
                byte val = (byte)(64 + (value >> offset & 0x3f));
                result[x - 1] = val;
            }
            return result;
        }

        //**********************************************
        public static int DecodeInt(byte[] val)
        {
            return DecodeInt(val, val.Length);
        }

         //**********************************************
        public static int DecodeInt(byte[] val, int length)
        {
            int intTot = 0;
            int y = 0;
            for (int x = (length - 1); x >= 0; x--)
            {
                int intTmp = (int)((val[x] - 64));
                if (y > 0)
                {
                    intTmp = intTmp * (int)(Math.Pow(64, y));
                }
                intTot += intTmp;
                y++;
            }
            return intTot;
        }
    }
}