コード例 #1
0
ファイル: TcpSackOption.java プロジェクト: pjsg/pcap4j
  private TcpSackOption(byte[] rawData, int offset, int length) throws IllegalRawDataException {
    if (length < 2) {
      StringBuilder sb = new StringBuilder(50);
      sb.append("The raw data length must be more than 1. rawData: ")
          .append(ByteArrays.toHexString(rawData, " "))
          .append(", offset: ")
          .append(offset)
          .append(", length: ")
          .append(length);
      throw new IllegalRawDataException(sb.toString());
    }
    if (rawData[offset] != kind.value()) {
      StringBuilder sb = new StringBuilder(100);
      sb.append("The kind must be: ")
          .append(kind.valueAsString())
          .append(" rawData: ")
          .append(ByteArrays.toHexString(rawData, " "))
          .append(", offset: ")
          .append(offset)
          .append(", length: ")
          .append(length);
      throw new IllegalRawDataException(sb.toString());
    }

    this.length = rawData[1 + offset];
    int lengthFieldAsInt = getLengthAsInt();
    if (lengthFieldAsInt < 2) {
      throw new IllegalRawDataException(
          "The value of length field must be  more than 1 but: " + lengthFieldAsInt);
    }

    if ((lengthFieldAsInt - 2) % (INT_SIZE_IN_BYTES * 2) != 0) {
      StringBuilder sb = new StringBuilder(100);
      sb.append("The value of length field must be an integer multiple of 8 octets long but: ")
          .append(lengthFieldAsInt);
      throw new IllegalRawDataException(sb.toString());
    }
    if (length < lengthFieldAsInt) {
      StringBuilder sb = new StringBuilder(100);
      sb.append("rawData is too short. length field: ")
          .append(lengthFieldAsInt)
          .append(", rawData: ")
          .append(ByteArrays.toHexString(rawData, " "))
          .append(", offset: ")
          .append(offset)
          .append(", length: ")
          .append(length);
      throw new IllegalRawDataException(sb.toString());
    }

    for (int i = 2; i < lengthFieldAsInt; i += INT_SIZE_IN_BYTES * 2) {
      sacks.add(
          new Sack(
              ByteArrays.getInt(rawData, i + offset),
              ByteArrays.getInt(rawData, i + INT_SIZE_IN_BYTES + offset)));
    }
  }
コード例 #2
0
ファイル: TcpSackOption.java プロジェクト: pjsg/pcap4j
  @Override
  public byte[] getRawData() {
    byte[] rawData = new byte[length()];
    rawData[0] = kind.value();
    rawData[1] = length;

    int offset = 2;
    for (Sack sack : sacks) {
      System.arraycopy(
          ByteArrays.toByteArray(sack.leftEdge), 0, rawData, offset, INT_SIZE_IN_BYTES);
      System.arraycopy(
          ByteArrays.toByteArray(sack.rightEdge),
          0,
          rawData,
          offset + INT_SIZE_IN_BYTES,
          INT_SIZE_IN_BYTES);
      offset += INT_SIZE_IN_BYTES * 2;
    }

    return rawData;
  }