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The SNF4J module for TLS protocol

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/*
 * -------------------------------- MIT License --------------------------------
 * 
 * Copyright (c) 2022 SNF4J contributors
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * -----------------------------------------------------------------------------
 */
package org.snf4j.tls.extension;

import java.nio.BufferOverflowException;
import java.nio.ByteBuffer;

public abstract class AbstractExtension implements IExtension {
	
	private final ExtensionType type;
	
	protected AbstractExtension(ExtensionType type) {
		this.type = type;
	}
	
	@Override
	public ExtensionType getType() {
		return type;
	}

	@Override
	public void getBytes(ByteBuffer buffer) {
		int len = getDataLength();
		
		if (buffer.remaining() >= len+4) {
			buffer.putShort((short) getType().value());
			buffer.putShort((short) len);
			getData(buffer);
			return;
		}
		throw new BufferOverflowException();
	}
	
	protected abstract void getData(ByteBuffer buffer);
	
}