String To Bytes Base32 - CSharp System

CSharp examples for System:String Base32

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Description

String To Bytes Base32

Demo Code


using System;//from w w  w  .j a  va2 s.  co m

public class Main{
        public static byte[] ToBytesBase32(this string input)
        {
            if (input == string.Empty)
                throw new ArgumentException("input");

            input = input.TrimEnd('='); //remove padding characters
            int byteCount = input.Length * 5 / 8; //this must be TRUNCATED
            byte[] returnArray = new byte[byteCount];

            byte curByte = 0, bitsRemaining = 8;
            int mask = 0, arrayIndex = 0;

            foreach (char c in input.ToUpper().ToCharArray())
            {
                int cValue = CharToValue(c);

                if (bitsRemaining > 5)
                {
                    mask = cValue << (bitsRemaining - 5);
                    curByte = (byte)(curByte | mask);
                    bitsRemaining -= 5;
                }
                else
                {
                    mask = cValue >> (5 - bitsRemaining);
                    curByte = (byte)(curByte | mask);
                    returnArray[arrayIndex++] = curByte;
                    curByte = (byte)(cValue << (3 + bitsRemaining));
                    bitsRemaining += 3;
                }
            }

            //if we didn't end with a full byte
            if (arrayIndex != byteCount)
                returnArray[arrayIndex] = curByte;

            return returnArray;
        }
}

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