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The Bouncy Castle Java APIs for the OpenPGP Protocol. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.bcpg;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

/**
 * Basic type for a trust packet
 */
public class TrustPacket 
    extends ContainedPacket
{    
    byte[]    levelAndTrustAmount;

    public TrustPacket(
            BCPGInputStream  in)
            throws IOException
    {
        this(in, false);
    }

    public TrustPacket(
        BCPGInputStream  in,
        boolean newPacketFormat)
        throws IOException
    {
        super(TRUST, newPacketFormat);

        ByteArrayOutputStream    bOut = new ByteArrayOutputStream();
        int                      ch;
        
        while ((ch = in.read()) >= 0)
        {
            bOut.write(ch);
        }
        
        levelAndTrustAmount = bOut.toByteArray();
    }
    
    public TrustPacket(
        int    trustCode)
    {
        super(TRUST);

        this.levelAndTrustAmount = new byte[1];
        
        this.levelAndTrustAmount[0] = (byte)trustCode;
    }

    public byte[] getLevelAndTrustAmount()
    {
        return levelAndTrustAmount;
    }

    public void encode(
        BCPGOutputStream    out)
        throws IOException
    {
        out.writePacket(hasNewPacketFormat(), TRUST, levelAndTrustAmount);
    }
}