eu.scape_project.arc2warc.utils.ArcUtils.java Source code

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Here is the source code for eu.scape_project.arc2warc.utils.ArcUtils.java

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/*
 * Copyright 2012 The SCAPE Project Consortium.
 *
 * Licensed 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. under the License.
 */
package eu.scape_project.arc2warc.utils;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.archive.io.arc.ARCRecord;
import org.archive.uid.RecordIDGenerator;
import org.archive.uid.UUIDGenerator;

/**
 * ARC utility methods.
 *
 * @author Sven Schlarb https://github.com/shsdev
 */
public class ArcUtils {

    public static final int BUFFER_SIZE = 8192;

    private static final Log LOG = LogFactory.getLog(ArcUtils.class);

    static protected RecordIDGenerator generator = new UUIDGenerator();

    /**
     * Read the ARC record content into a byte array. Note that the record
     * content can be only read once, it is "consumed" afterwards.
     *
     * @param arcRecord ARC record.
     * @return Content byte array.
     * @throws IOException If content is too large to be stored in a byte array.
     */
    public static byte[] arcRecordPayloadToByteArray(ARCRecord arcRecord) throws IOException {
        // Byte point where the content of the ARC record begins
        int contentBegin = (int) arcRecord.getMetaData().getContentBegin();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        BufferedInputStream buffis = new BufferedInputStream(arcRecord);
        BufferedOutputStream buffos = new BufferedOutputStream(baos);
        byte[] tempBuffer = new byte[BUFFER_SIZE];
        int bytesRead;
        // skip header content
        buffis.skip(contentBegin);
        while ((bytesRead = buffis.read(tempBuffer)) != -1) {
            buffos.write(tempBuffer, 0, bytesRead);
        }
        buffis.close();
        buffos.flush();
        buffos.close();
        return baos.toByteArray();
    }

}