org.pcap4j.packet.IpV6RoutingSourceRouteData Maven / Gradle / Ivy

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The core module of Pcap4J.
There is a newer version: 2.0.0-alpha.6
/*_##########################################################################
  _##
  _##  Copyright (C) 2012-2014 Pcap4J.org
  _##
  _##########################################################################
*/

package org.pcap4j.packet;

import static org.pcap4j.util.ByteArrays.*;

import java.net.Inet6Address;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.pcap4j.packet.IpV6ExtRoutingPacket.IpV6RoutingData;
import org.pcap4j.util.ByteArrays;

/**
 * @author Kaito Yamada
 * @since pcap4j 0.9.11
 */
public final class IpV6RoutingSourceRouteData implements IpV6RoutingData {

  /** */
  private static final long serialVersionUID = -7972526977248222954L;

  private final int reserved;
  private final List addresses;

  /**
   * A static factory method. This method validates the arguments by {@link
   * ByteArrays#validateBounds(byte[], int, int)}, which may throw exceptions undocumented here.
   *
   * @param rawData rawData
   * @param offset offset
   * @param length length
   * @return a new IpV6RoutingSourceRouteData object.
   * @throws IllegalRawDataException if parsing the raw data fails.
   */
  public static IpV6RoutingSourceRouteData newInstance(byte[] rawData, int offset, int length)
      throws IllegalRawDataException {
    ByteArrays.validateBounds(rawData, offset, length);
    return new IpV6RoutingSourceRouteData(rawData, offset, length);
  }

  private IpV6RoutingSourceRouteData(byte[] rawData, int offset, int length)
      throws IllegalRawDataException {
    if (length < 4) {
      StringBuilder sb = new StringBuilder(100);
      sb.append("rawData length must be more than 3. rawData: ")
          .append(ByteArrays.toHexString(rawData, " "))
          .append(", offset: ")
          .append(offset)
          .append(", length: ")
          .append(length);
      throw new IllegalRawDataException(sb.toString());
    }
    if (((length - 4) % INET6_ADDRESS_SIZE_IN_BYTES) != 0) {
      StringBuilder sb = new StringBuilder(100);
      sb.append("(length -4 ) % ")
          .append(INET6_ADDRESS_SIZE_IN_BYTES)
          .append(" must be 0. rawData: ")
          .append(ByteArrays.toHexString(rawData, " "))
          .append(", offset: ")
          .append(offset)
          .append(", length: ")
          .append(length);
      throw new IllegalRawDataException(sb.toString());
    }

    this.reserved = ByteArrays.getInt(rawData, offset);
    this.addresses = new ArrayList();

    for (int i = INT_SIZE_IN_BYTES; i < length; i += INET6_ADDRESS_SIZE_IN_BYTES) {
      addresses.add(ByteArrays.getInet6Address(rawData, i + offset));
    }
  }

  /**
   * @param reserved reserved
   * @param addresses addresses
   */
  public IpV6RoutingSourceRouteData(int reserved, List addresses) {
    if (addresses == null) {
      throw new NullPointerException("addresses must not be null");
    }
    this.reserved = reserved;
    this.addresses = new ArrayList(addresses);
  }

  @Override
  public int length() {
    return addresses.size() * INET6_ADDRESS_SIZE_IN_BYTES + INT_SIZE_IN_BYTES;
  }

  @Override
  public byte[] getRawData() {
    byte[] rawData = new byte[length()];
    System.arraycopy(ByteArrays.toByteArray(reserved), 0, rawData, 0, INT_SIZE_IN_BYTES);

    Iterator iter = addresses.iterator();
    for (int i = INT_SIZE_IN_BYTES; i < rawData.length; i += INET6_ADDRESS_SIZE_IN_BYTES) {
      System.arraycopy(
          ByteArrays.toByteArray(iter.next()), 0, rawData, i, INET6_ADDRESS_SIZE_IN_BYTES);
    }
    return rawData;
  }

  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append("[reserved: ").append(reserved).append("] [addresses:");
    for (Inet6Address addr : addresses) {
      sb.append(" ").append(addr);
    }
    sb.append("]");
    return sb.toString();
  }

  @Override
  public boolean equals(Object obj) {
    if (obj == this) {
      return true;
    }
    if (!this.getClass().isInstance(obj)) {
      return false;
    }

    IpV6RoutingSourceRouteData other = (IpV6RoutingSourceRouteData) obj;
    return reserved == other.reserved && addresses.equals(other.addresses);
  }

  @Override
  public int hashCode() {
    int result = 17;
    result = 31 * result + reserved;
    result = 31 * result + addresses.hashCode();
    return result;
  }
}