DerUniversalString.cs :  » PDF » iTextSharp » Org » BouncyCastle » Asn1 » C# / CSharp Open Source

using System;
using System.Text;

using Org.BouncyCastle.Utilities;

namespace Org.BouncyCastle.Asn1{
    /**
     * Der UniversalString object.
     */
    public class DerUniversalString
        : DerStringBase
    {
        private static readonly char[] table = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };

    private readonly byte[] str;

    /**
         * return a Universal string from the passed in object.
         *
         * @exception ArgumentException if the object cannot be converted.
         */
        public static DerUniversalString GetInstance(
            object obj)
        {
            if (obj == null || obj is DerUniversalString)
            {
                return (DerUniversalString)obj;
            }

            if (obj is Asn1OctetString)
            {
                return new DerUniversalString(((Asn1OctetString)obj).GetOctets());
            }

            throw new ArgumentException("illegal object in GetInstance: " + obj.GetType().Name);
        }

        /**
         * return a Universal string from a tagged object.
         *
         * @param obj the tagged object holding the object we want
         * @param explicitly true if the object is meant to be explicitly
         *              tagged false otherwise.
         * @exception ArgumentException if the tagged object cannot
         *               be converted.
         */
        public static DerUniversalString GetInstance(
            Asn1TaggedObject  obj,
            bool        explicitly)
        {
            return GetInstance(obj.GetObject());
        }

        /**
         * basic constructor - byte encoded string.
         */
        public DerUniversalString(
            byte[] str)
        {
      if (str == null)
        throw new ArgumentNullException("str");

      this.str = str;
        }

        public override string GetString()
        {
      StringBuilder buffer = new StringBuilder("#");
      byte[] enc = GetDerEncoded();

      for (int i = 0; i != enc.Length; i++)
      {
        uint ubyte = enc[i];
        buffer.Append(table[(ubyte >> 4) & 0xf]);
        buffer.Append(table[enc[i] & 0xf]);
      }

            return buffer.ToString();
        }

    public byte[] GetOctets()
        {
            return (byte[]) str.Clone();
        }

    internal override void Encode(
            DerOutputStream derOut)
        {
            derOut.WriteEncoded(Asn1Tags.UniversalString, this.str);
        }

    protected override bool Asn1Equals(
      Asn1Object asn1Object)
    {
      DerUniversalString other = asn1Object as DerUniversalString;

      if (other == null)
        return false;

//      return this.GetString().Equals(other.GetString());
      return Arrays.AreEqual(this.str, other.str);
        }
    }
}