org.opendaylight.protocol.bgp.parser.spi.ParameterUtil Maven / Gradle / Ivy
/*
* Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.protocol.bgp.parser.spi;
import static com.google.common.base.Preconditions.checkArgument;
import io.netty.buffer.ByteBuf;
import org.opendaylight.protocol.util.Values;
/**
* Utility class which is intended for formatting parameter.
*/
public final class ParameterUtil {
private ParameterUtil() {
}
/**
* Adds header to parameter value in RFC4271 format.
*
* @param type of the parameter
* @param value parameter value
* @param buffer ByteBuf where the parameter will be copied with its header
* @throws IllegalArgumentException if value length exceeds 255 bytes
*/
public static void formatParameter(final int type, final ByteBuf value, final ByteBuf buffer)
throws ParameterLengthOverflowException {
final int valueLength = value.writerIndex();
ParameterLengthOverflowException.throwIf(valueLength > Values.UNSIGNED_BYTE_MAX_VALUE,
"Cannot encode %s-byte value", valueLength);
buffer.writeByte(type);
buffer.writeByte(valueLength);
buffer.writeBytes(value);
}
/**
* Adds header to parameter value in draft-ietf-idr-ext-opt-param-05 format.
*
* @param type of the parameter
* @param value parameter value
* @param buffer ByteBuf where the parameter will be copied with its header
* @throws IllegalArgumentException if value length exceeds 65535 bytes
*/
public static void formatExtendedParameter(final int type, final ByteBuf value, final ByteBuf buffer) {
final int valueLength = value.writerIndex();
checkArgument(valueLength < Values.UNSIGNED_SHORT_MAX_VALUE, "Cannot encode %s-byte value", valueLength);
buffer.writeByte(type);
buffer.writeShort(valueLength);
buffer.writeBytes(value);
}
}