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package port.org.bouncycastle.asn1;

import java.io.IOException;

/**
 * Base class for ASN.1 primitive objects. These are the actual objects used to generate byte encodings.
 */
public abstract class ASN1Primitive
extends ASN1Object
{
	ASN1Primitive()
	{

	}

	/**
	 * Create a base ASN.1 object from a byte stream.
	 *
	 * @param data the byte stream to parse.
	 * @return the base ASN.1 object represented by the byte stream.
	 * @exception IOException if there is a problem parsing the data.
	 */
	public static ASN1Primitive fromByteArray(byte[] data)
			throws IOException
	{
		ASN1InputStream aIn = new ASN1InputStream(data);

		try
		{
			return aIn.readObject();
		}
		catch (ClassCastException e)
		{
			throw new IOException("cannot recognise object in stream");
		}
	}

	public final boolean equals(Object o)
	{
		if (this == o)
		{
			return true;
		}

		return (o instanceof ASN1Encodable) && asn1Equals(((ASN1Encodable)o).toASN1Primitive());
	}

	public ASN1Primitive toASN1Primitive()
	{
		return this;
	}

	/**
	 * Return the current object as one which encodes using Distinguished Encoding Rules.
	 *
	 * @return a DER version of this.
	 */
	ASN1Primitive toDERObject()
	{
		return this;
	}

	/**
	 * Return the current object as one which encodes using Definite Length encoding.
	 *
	 * @return a DL version of this.
	 */
	ASN1Primitive toDLObject()
	{
		return this;
	}

	public abstract int hashCode();

	abstract boolean isConstructed();

	abstract int encodedLength() throws IOException;

	abstract void encode(ASN1OutputStream out) throws IOException;

	abstract boolean asn1Equals(ASN1Primitive o);
}




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