byte array To String Base32 - CSharp System

CSharp examples for System:String Base32

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Description

byte array To String Base32

Demo Code


using System;/*  w  ww .j  ava2  s . co m*/

public class Main{
        public static string ToStringBase32(this byte[] input)
        {
            if (input == null || input.Length == 0)
                throw new ArgumentException("input");

            int charCount = (int)Math.Ceiling(input.Length / 5d) * 8;
            char[] returnArray = new char[charCount];

            byte nextChar = 0, bitsRemaining = 5;
            int arrayIndex = 0;

            foreach (byte b in input)
            {
                nextChar = (byte)(nextChar | (b >> (8 - bitsRemaining)));
                returnArray[arrayIndex++] = ValueToChar(nextChar);

                if (bitsRemaining < 4)
                {
                    nextChar = (byte)((b >> (3 - bitsRemaining)) & 31);
                    returnArray[arrayIndex++] = ValueToChar(nextChar);
                    bitsRemaining += 5;
                }

                bitsRemaining -= 3;
                nextChar = (byte)((b << bitsRemaining) & 31);
            }

            //if we didn't end with a full char
            if (arrayIndex != charCount)
            {
                returnArray[arrayIndex++] = ValueToChar(nextChar);
                while (arrayIndex != charCount) returnArray[arrayIndex++] = '='; //padding
            }

            return new string(returnArray);
        }
        private static char ValueToChar(byte b)
        {
            if (b < 26)
                return (char)(b + 65);

            if (b < 32)
                return (char)(b + 24);

            throw new ArgumentException("Byte is not a value Base32 value.", "b");
        }
}

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