org.farng.mp3.lyrics3.AbstractLyrics3v2FieldBody Maven / Gradle / Ivy

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This library reads song information, such as song title, artist, and album, from an MP3 file. It supports ID3v1, ID3v1.1, Lyrics3v1, Lyrics3v2, ID3v2.2, ID3v2.3, and ID3v2.4 tags. MP3 Frame Headers can also be read. There is a FilenameTag, a ID3v2.4 tag that is intelligently derived from the file name. It contains tag synchronization utilities, multiple save options, and easy tag conversion methods.

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package org.farng.mp3.lyrics3;

import org.farng.mp3.AbstractMP3FragmentBody;
import org.farng.mp3.InvalidTagException;
import org.farng.mp3.TagOptionSingleton;

import java.io.IOException;
import java.io.RandomAccessFile;

/**
 * Contains the actual text strings for a Lyrics3v2 field.
 *
 * @author Eric Farng
 * @version $Revision: 1.4 $
 */
public abstract class AbstractLyrics3v2FieldBody extends AbstractMP3FragmentBody {

    /**
     * Creates a new AbstractLyrics3v2FieldBody object.
     */
    public AbstractLyrics3v2FieldBody() {
        super();
    }

    /**
     * Creates a new AbstractLyrics3v2FieldBody object.
     */
    public AbstractLyrics3v2FieldBody(final AbstractLyrics3v2FieldBody copyObject) {
        super(copyObject);
    }

    protected int readHeader(final RandomAccessFile file) throws InvalidTagException, IOException {
        final int size;
        final byte[] buffer = new byte[5];

        // read the 5 character size
        file.read(buffer, 0, 5);
        size = Integer.parseInt(new String(buffer, 0, 5));
        if ((size == 0) && (TagOptionSingleton.getInstance().isLyrics3KeepEmptyFieldIfRead() == false)) {
            throw new InvalidTagException("Lyircs3v2 Field has size of zero.");
        }
        return size;
    }

    protected void writeHeader(final RandomAccessFile file, final int size) throws IOException {
        final String str;
        int offset = 0;
        final byte[] buffer = new byte[5];

        // todo change this to use pad String
        str = Integer.toString(getSize());
        for (int i = 0; i < (5 - str.length()); i++) {
            buffer[i] = (byte) '0';
        }
        offset += (5 - str.length());
        for (int i = 0; i < str.length(); i++) {
            buffer[i + offset] = (byte) str.charAt(i);
        }
        file.write(buffer);
    }
}