derapplicationspecific.java

java 文件下载器。可自定义

// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   DERApplicationSpecific.java

package org.bouncycastle.asn1;

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

// Referenced classes of package org.bouncycastle.asn1:
//			ASN1Object, ASN1InputStream, DEROutputStream, DEREncodable, 
//			DERObject

public class DERApplicationSpecific extends ASN1Object
{

	private int tag;
	private byte octets[];

	public DERApplicationSpecific(int tag, byte octets[])
	{
		this.tag = tag;
		this.octets = octets;
	}

	public DERApplicationSpecific(int tag, DEREncodable object)
		throws IOException
	{
		this(true, tag, object);
	}

	public DERApplicationSpecific(boolean explicit, int tag, DEREncodable object)
		throws IOException
	{
		ByteArrayOutputStream bOut = new ByteArrayOutputStream();
		DEROutputStream dos = new DEROutputStream(bOut);
		dos.writeObject(object);
		byte data[] = bOut.toByteArray();
		if (tag >= 31)
			throw new IOException("unsupported tag number");
		if (explicit)
		{
			this.tag = tag | 0x20;
			octets = data;
		} else
		{
			this.tag = tag;
			int lenBytes = getLengthOfLength(data);
			byte tmp[] = new byte[data.length - lenBytes];
			System.arraycopy(data, lenBytes, tmp, 0, tmp.length);
			octets = tmp;
		}
	}

	private int getLengthOfLength(byte data[])
	{
		int count;
		for (count = 2; (data[count - 1] & 0x80) != 0; count++);
		return count;
	}

	public boolean isConstructed()
	{
		return (tag & 0x20) != 0;
	}

	public byte[] getContents()
	{
		return octets;
	}

	public int getApplicationTag()
	{
		return tag;
	}

	public DERObject getObject()
		throws IOException
	{
		return (new ASN1InputStream(getContents())).readObject();
	}

	public DERObject getObject(int derTagNo)
		throws IOException
	{
		if (tag >= 31)
		{
			throw new IOException("unsupported tag number");
		} else
		{
			byte tmp[] = getEncoded();
			tmp[0] = (byte)derTagNo;
			return (new ASN1InputStream(tmp)).readObject();
		}
	}

	void encode(DEROutputStream out)
		throws IOException
	{
		out.writeEncoded(0x40 | tag, octets);
	}

	boolean asn1Equals(DERObject o)
	{
		if (!(o instanceof DERApplicationSpecific))
			return false;
		DERApplicationSpecific other = (DERApplicationSpecific)o;
		if (tag != other.tag)
			return false;
		if (octets.length != other.octets.length)
			return false;
		for (int i = 0; i < octets.length; i++)
			if (octets[i] != other.octets[i])
				return false;

		return true;
	}

	public int hashCode()
	{
		byte b[] = getContents();
		int value = 0;
		for (int i = 0; i != b.length; i++)
			value ^= (b[i] & 0xff) << i % 4;

		return value ^ getApplicationTag();
	}
}