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/* ====================================================================
   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.poi.hslf.record;

import java.io.IOException;
import java.io.OutputStream;

import org.apache.poi.util.IOUtils;
import org.apache.poi.util.LittleEndian;

/**
 * Storage for embedded sounds.
 *
 * @author Yegor Kozlov
 */
public final class SoundData extends RecordAtom {


    //arbitrarily selected; may need to increase
    private static final int MAX_RECORD_LENGTH = 100_000_000;

    /**
     * Record header.
     */
    private byte[] _header;

    /**
     * Record data.
     */
    private byte[] _data;

    /**
     * Constructs a new empty sound container.
     */
    protected SoundData() {
        _header = new byte[8];
        _data = new byte[0];

        LittleEndian.putShort(_header, 2, (short)getRecordType());
        LittleEndian.putInt(_header, 4, _data.length);
    }

    /**
     * Constructs the link related atom record from its
     *  source data.
     *
     * @param source the source data as a byte array.
     * @param start the start offset into the byte array.
     * @param len the length of the slice in the byte array.
     */
    protected SoundData(byte[] source, int start, int len) {
        // Get the header.
        _header = new byte[8];
        System.arraycopy(source,start,_header,0,8);

        // Get the record data.
        _data = IOUtils.safelyAllocate(len-8, MAX_RECORD_LENGTH);
        System.arraycopy(source,start+8,_data,0,len-8);
    }

    /**
     * Returns the sound data.
     *
     * @return the sound data
     */
    public byte[] getData() {
        return _data;
    }

    /**
     * Gets the record type.
     *
     * @return the record type.
     */
    public long getRecordType() {
        return RecordTypes.SoundData.typeID;
    }

    /**
     * Write the contents of the record back, so it can be written
     * to disk.
     *
     * @param out the output stream to write to.
     * @throws java.io.IOException if an error occurs.
     */
    public void writeOut(OutputStream out) throws IOException {
        out.write(_header);
        out.write(_data);
    }
}