containers-docker-local/src/main/java/org/apache/aries/containers/docker/local/impl/Streams.java

/*
 * 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 WARRANTIESOR 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.aries.containers.docker.local.impl;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public final class Streams {
    private Streams() {
        // Util class do not instantiate
    }

    public static void pump(InputStream is, OutputStream os) throws IOException {
        byte[] bytes = new byte[16384];

        int length = 0;
        int offset = 0;

        while ((length = is.read(bytes, offset, bytes.length - offset)) != -1) {
            offset += length;

            if (offset == bytes.length) {
                os.write(bytes, 0, bytes.length);
                offset = 0;
            }
        }
        if (offset != 0) {
            os.write(bytes, 0, offset);
        }
    }

    public static byte [] suck(InputStream is) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try {
            pump(is, baos);
            return baos.toByteArray();
        } finally {
            is.close();
        }
    }
}