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using System;

using System.IO;

using Org.BouncyCastle.Math;

namespace Org.BouncyCastle.Bcpg

{

/// <remarks>A multiple precision integer</remarks>

public class MPInteger

: BcpgObject

{

private readonly BigInteger val;

public MPInteger(

BcpgInputStream bcpgIn)

{

if (bcpgIn == null)

throw new ArgumentNullException("bcpgIn");

int length = (bcpgIn.ReadByte() << 8) | bcpgIn.ReadByte();

byte[] bytes = new byte[(length + 7) / 8];

bcpgIn.ReadFully(bytes);

this.val = new BigInteger(1, bytes);

}

public MPInteger(

BigInteger val)

{

if (val == null)

throw new ArgumentNullException("val");

if (val.SignValue < 0)

throw new ArgumentException("Values must be positive", "val");

this.val = val;

}

public BigInteger Value

{

get { return val; }

}

public override void Encode(

BcpgOutputStream bcpgOut)

{

bcpgOut.WriteShort((short) val.BitLength);

bcpgOut.Write(val.ToByteArrayUnsigned());

}

internal static void Encode(

BcpgOutputStream bcpgOut,

BigInteger val)

{

bcpgOut.WriteShort((short) val.BitLength);

bcpgOut.Write(val.ToByteArrayUnsigned());

}

}

}