| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.drill.exec.store.pcap; |
| |
| import java.io.DataOutputStream; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * Concatenates PCAP files. The only trickiness is that we have to skip the |
| * 24 byte header on all but the first file. |
| */ |
| public class ConcatPcap { |
| public static void main(String[] args) throws IOException { |
| try (DataOutputStream out = new DataOutputStream(System.out)) { |
| if (args.length > 0) { |
| boolean first = true; |
| for (String arg : args) { |
| try (FileInputStream in = new FileInputStream(arg)) { |
| copy(first, in, out); |
| first = false; |
| } |
| } |
| } else { |
| copy(true, System.in, out); |
| } |
| } |
| } |
| |
| /** |
| * Concatenates a stream onto the output. |
| * |
| * @param first Is this the beginning of the output? |
| * @param in The data to copy to the output |
| * @param out Where the output should go |
| * @throws IOException If there is an error reading or writing. |
| */ |
| public static void copy(boolean first, InputStream in, DataOutputStream out) throws IOException { |
| byte[] buffer = new byte[1024 * 1024]; |
| int n; |
| if (!first) { |
| //noinspection UnusedAssignment |
| n = (int) in.skip(6 * 4L); |
| } |
| n = in.read(buffer); |
| while (n > 0) { |
| out.write(buffer, 0, n); |
| n = in.read(buffer); |
| } |
| } |
| } |