blob: aebd5411ffb4bc0eb919cdeab083433faec6b911 [file] [log] [blame]
/*
* 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);
}
}
}