Coverage Report

Coverage Report - org.jaudiotagger.tag.id3.ID3v1Tag

Classes in this File
Line Coverage
Branch Coverage
Complexity
ID3v1Tag
68%
221/323
58%
88/153
ID3v1Tag$1
100%
1/1
N/A
 /**
  *  @author : Paul Taylor
  *  @author : Eric Farng
  *
  *  Version @version:$Id: ID3v1Tag.java,v 1.27 2008/07/24 13:47:06 paultaylor Exp $
  *
  *  MusicTag Copyright (C)2003,2004
  *
  *  This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser
  *  General Public  License as published by the Free Software Foundation; either version 2.1 of the License,
  *  or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
  *  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  *  See the GNU Lesser General Public License for more details.
  *
  *  You should have received a copy of the GNU Lesser General Public License along with this library; if not,
  *  you can get a copy from http://www.opensource.org/licenses/lgpl-license.php or write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  *
  * Description:
  *
  */
 package org.jaudiotagger.tag.id3;
 
 import org.jaudiotagger.audio.generic.Utils;
 import org.jaudiotagger.audio.mp3.MP3File;
 import org.jaudiotagger.logging.ErrorMessage;
 import org.jaudiotagger.tag.*;
 import org.jaudiotagger.tag.id3.framebody.FrameBodyPIC;
 import org.jaudiotagger.tag.id3.valuepair.ImageFormats;
 import org.jaudiotagger.tag.datatype.Artwork;
 import org.jaudiotagger.tag.reference.GenreTypes;
 
 import java.io.IOException;
 import java.io.RandomAccessFile;
 import java.nio.ByteBuffer;
 import java.nio.channels.FileChannel;
 import java.util.*;
 import java.util.regex.Matcher;
 
 /**
  * Represents an ID3v1 tag.
  *
  * @author : Eric Farng
  * @author : Paul Taylor
  */
 public class ID3v1Tag extends AbstractID3v1Tag implements Tag
 {
     static EnumMap<TagFieldKey, ID3v1FieldKey> tagFieldToID3v1Field = new EnumMap<TagFieldKey, ID3v1FieldKey>(TagFieldKey.class);
 
     static
     {
         tagFieldToID3v1Field.put(TagFieldKey.ARTIST, ID3v1FieldKey.ARTIST);
         tagFieldToID3v1Field.put(TagFieldKey.ALBUM, ID3v1FieldKey.ALBUM);
         tagFieldToID3v1Field.put(TagFieldKey.TITLE, ID3v1FieldKey.TITLE);
         tagFieldToID3v1Field.put(TagFieldKey.TRACK, ID3v1FieldKey.TRACK);
         tagFieldToID3v1Field.put(TagFieldKey.YEAR, ID3v1FieldKey.YEAR);
         tagFieldToID3v1Field.put(TagFieldKey.GENRE, ID3v1FieldKey.GENRE);
         tagFieldToID3v1Field.put(TagFieldKey.COMMENT, ID3v1FieldKey.COMMENT);
     }
 
     //For writing output
     protected static final String TYPE_COMMENT = "comment";
 
 
     protected static final int FIELD_COMMENT_LENGTH = 30;
     protected static final int FIELD_COMMENT_POS = 97;
     protected static final int BYTE_TO_UNSIGNED = 0xff;
 
     protected static final int GENRE_UNDEFINED = 0xff;
 
     /**
      *
      */
     protected String album = "";
 
     /**
      *
      */
     protected String artist = "";
 
     /**
      *
      */
     protected String comment = "";
 
     /**
      *
      */
     protected String title = "";
 
     /**
      *
      */
     protected String year = "";
 
     /**
      *
      */
     protected byte genre = (byte) -1;
 
 
     private static final byte RELEASE = 1;
     private static final byte MAJOR_VERSION = 0;
     private static final byte REVISION = 0;
 
     /**
      * Retrieve the Release
      */
     public byte getRelease()
     {
         return RELEASE;
     }
 
     /**
      * Retrieve the Major Version
      */
     public byte getMajorVersion()
     {
         return MAJOR_VERSION;
     }
 
     /**
      * Retrieve the Revision
      */
     public byte getRevision()
     {
         return REVISION;
     }
 
     /**
      * Creates a new ID3v1 datatype.
      */
     public ID3v1Tag()
     {
 
     }
 
     public ID3v1Tag(ID3v1Tag copyObject)
     {
         super(copyObject);
 
         this.album = new String(copyObject.album);
         this.artist = new String(copyObject.artist);
         this.comment = new String(copyObject.comment);
         this.title = new String(copyObject.title);
         this.year = new String(copyObject.year);
         this.genre = copyObject.genre;
     }
 
     public ID3v1Tag(AbstractTag mp3tag)
     {
 
         if (mp3tag != null)
         {
             ID3v11Tag convertedTag;
             if (mp3tag instanceof ID3v1Tag)
             {
                 throw new UnsupportedOperationException("Copy Constructor not called. Please type cast the argument");
             }
             if (mp3tag instanceof ID3v11Tag)
             {
                 convertedTag = (ID3v11Tag) mp3tag;
             }
             else
             {
                 convertedTag = new ID3v11Tag(mp3tag);
             }
             this.album = new String(convertedTag.album);
             this.artist = new String(convertedTag.artist);
             this.comment = new String(convertedTag.comment);
             this.title = new String(convertedTag.title);
             this.year = new String(convertedTag.year);
             this.genre = convertedTag.genre;
         }
     }
 
     /**
      * Creates a new ID3v1 datatype.
      *
      * @param file
      * @param loggingFilename
      * @throws TagNotFoundException
      * @throws IOException
      */
     public ID3v1Tag(RandomAccessFile file, String loggingFilename) throws TagNotFoundException, IOException
     {
         setLoggingFilename(loggingFilename);
         FileChannel fc;
         ByteBuffer byteBuffer;
 
         fc = file.getChannel();
         fc.position(file.length() - TAG_LENGTH);
         byteBuffer = ByteBuffer.allocate(TAG_LENGTH);
         fc.read(byteBuffer);
         byteBuffer.flip();
         read(byteBuffer);
     }
 
     /**
      * Creates a new ID3v1 datatype.
      *
      * @param file
      * @throws TagNotFoundException
      * @throws IOException
      * @deprecated use {@link #ID3v1Tag(RandomAccessFile,String)} instead
      */
     public ID3v1Tag(RandomAccessFile file) throws TagNotFoundException, IOException
     {
         this(file, "");
     }
 
     public void add(TagField field)
     {
         //TODO
     }
 
     public List<TagField> get(String id)
     {
 
         if (TagFieldKey.ARTIST.name().equals(id))
         {
             return getArtist();
         }
         else if (TagFieldKey.ALBUM.name().equals(id))
         {
             return getAlbum();
         }
         else if (TagFieldKey.TITLE.name().equals(id))
         {
             return getTitle();
         }
         else if (TagFieldKey.GENRE.name().equals(id))
         {
             return getGenre();
         }
         else if (TagFieldKey.YEAR.name().equals(id))
         {
             return getYear();
         }
         else if (TagFieldKey.COMMENT.name().equals(id))
         {
             return getComment();
         }
         return new ArrayList<TagField>();
     }
 
     public int getFieldCount()
     {
         return 6;
     }
 
     protected List<TagField> returnFieldToList(ID3v1TagField field)
     {
         List<TagField> fields = new ArrayList<TagField>();
         fields.add(field);
         return fields;
     }
 
     /**
      * Add Album
      * <p/>
      * <p>Only one album can be added so if one already exists it will be replaced.
      *
      * @param album
      */
     public void addAlbum(String album)
     {
         setAlbum(album);
     }
 
     /**
      * Set Album
      *
      * @param album
      */
     public void setAlbum(String album)
     {
         if (album == null)
         {
             throw new IllegalArgumentException(ErrorMessage.GENERAL_INVALID_NULL_ARGUMENT.getMsg());
         }
         this.album = ID3Tags.truncate(album, this.FIELD_ALBUM_LENGTH);
     }
 
     /**
      * Get Album
      *
      * @return album
      */
     public String getFirstAlbum()
     {
         return album;
     }
 
     /**
      * @return album within list or empty if does not exist
      */
     public List<TagField> getAlbum()
     {
         if (getFirstAlbum().length() > 0)
         {
             ID3v1TagField field = new ID3v1TagField(ID3v1FieldKey.ALBUM.name(), getFirstAlbum());
             return returnFieldToList(field);
         }
         else
         {
             return new ArrayList<TagField>();
         }
     }
 
 
     /**
      * Add Artist
      * <p/>
      * <p>Only one artist can be added so if one already exists it will be replaced.
      *
      * @param artist
      */
     public void addArtist(String artist)
     {
         setArtist(album);
     }
 
 
     /**
      * Set Artist
      *
      * @param artist
      */
     public void setArtist(String artist)
     {
         if (artist == null)
         {
             throw new IllegalArgumentException(ErrorMessage.GENERAL_INVALID_NULL_ARGUMENT.getMsg());
         }
         this.artist = ID3Tags.truncate(artist, this.FIELD_ARTIST_LENGTH);
     }
 
     /**
      * Get Artist
      *
      * @return artist
      */
     public String getFirstArtist()
     {
         return artist;
     }
 
     /**
      * @return Artist within list or empty if does not exist
      */
     public List<TagField> getArtist()
     {
         if (getFirstArtist().length() > 0)
         {
             ID3v1TagField field = new ID3v1TagField(ID3v1FieldKey.ARTIST.name(), getFirstArtist());
             return returnFieldToList(field);
         }
         else
         {
             return new ArrayList<TagField>();
         }
     }
 
     /**
      * Add Comment
      * <p/>
      * <p>Only one comment can be added so if one already exists it will be replaced.
      *
      * @param comment
      */
     public void addComment(String comment)
     {
         setComment(comment);
     }
 
     /**
      * Set Comment
      *
      * @param comment
      * @throws IllegalArgumentException if comment null
      */
     public void setComment(String comment)
     {
         if (comment == null)
         {
             throw new IllegalArgumentException(ErrorMessage.GENERAL_INVALID_NULL_ARGUMENT.getMsg());
         }
         this.comment = ID3Tags.truncate(comment, this.FIELD_COMMENT_LENGTH);
     }
 
     /**
      * @return comment within list or empty if does not exist
      */
     public List<TagField> getComment()
     {
         if (getFirstComment().length() > 0)
         {
             ID3v1TagField field = new ID3v1TagField(ID3v1FieldKey.COMMENT.name(), getFirstComment());
             return returnFieldToList(field);
         }
         else
         {
             return new ArrayList<TagField>();
         }
     }
 
     /**
      * Get Comment
      *
      * @return comment
      */
     public String getFirstComment()
     {
         return comment;
     }
 
     /**
      * Add Genre
      * <p/>
      * <p>Only one Genre can be added so if one already exists it will be replaced.
      *
      * @param genre
      */
     public void addGenre(String genre)
     {
         setGenre(genre);
     }
 
     /**
      * Sets the genreID,
      * <p/>
      * <p>ID3v1 only supports genres defined in a predefined list
      * so if unable to find value in list set 255, which seems to be the value
      * winamp uses for undefined.
      *
      * @param genreVal
      */
     public void setGenre(String genreVal)
     {
         if (genreVal == null)
         {
             throw new IllegalArgumentException(ErrorMessage.GENERAL_INVALID_NULL_ARGUMENT.getMsg());
         }
         Integer genreID = GenreTypes.getInstanceOf().getIdForValue(genreVal);
         if (genreID != null)
         {
             this.genre = genreID.byteValue();
         }
         else
         {
             this.genre = (byte) GENRE_UNDEFINED;
         }
     }
 
     /**
      * Get Genre
      *
      * @return genre or empty string if not valid
      */
     public String getFirstGenre()
     {
         Integer genreId = genre & this.BYTE_TO_UNSIGNED;
         String genreValue = GenreTypes.getInstanceOf().getValueForId(genreId);
         if (genreValue == null)
         {
             return "";
         }
         else
         {
             return genreValue;
         }
     }
 
     /**
      * Get Genre field
      * <p/>
      * <p>Only a single genre is available in ID3v1
      *
      * @return
      */
     public List<TagField> getGenre()
     {
         if (getFirstGenre().length() > 0)
         {
             ID3v1TagField field = new ID3v1TagField(ID3v1FieldKey.GENRE.name(), getFirstGenre());
             return returnFieldToList(field);
         }
         else
         {
             return new ArrayList<TagField>();
         }
     }
 
     /**
      * Add Title
      * <p/>
      * <p>Only one title can be added so if one already exists it will be replaced.
      *
      * @param title
      */
     public void addTitle(String title)
     {
         setTitle(title);
     }
 
     /**
      * Set Title
      *
      * @param title
      */
     public void setTitle(String title)
     {
         if (title == null)
         {
             throw new IllegalArgumentException(ErrorMessage.GENERAL_INVALID_NULL_ARGUMENT.getMsg());
         }
         this.title = ID3Tags.truncate(title, this.FIELD_TITLE_LENGTH);
     }
 
     /**
      * Get title
      *
      * @return Title
      */
     public String getFirstTitle()
     {
         return title;
     }
 
     /**
      * Get title field
      * <p/>
      * <p>Only a single title is available in ID3v1
      *
      * @return
      */
     public List<TagField> getTitle()
     {
         if (getFirstTitle().length() > 0)
         {
             ID3v1TagField field = new ID3v1TagField(ID3v1FieldKey.TITLE.name(), getFirstTitle());
             return returnFieldToList(field);
         }
         else
         {
             return new ArrayList<TagField>();
         }
     }
 
     /**
      * Add Year
      * <p/>
      * <p>Only one year can be added so if one already exists it will be replaced.
      *
      * @param year
      */
     public void addYear(String year)
     {
         setYear(year);
     }
 
     /**
      * Set year
      *
      * @param year
      */
     public void setYear(String year)
     {
         this.year = ID3Tags.truncate(year, this.FIELD_YEAR_LENGTH);
     }
 
     /**
      * Get year
      *
      * @return year
      */
     public String getFirstYear()
     {
         return year;
     }
 
     /**
      * Get year field
      * <p/>
      * <p>Only a single year is available in ID3v1
      *
      * @return
      */
     public List<TagField> getYear()
     {
         if (getFirstYear().length() > 0)
         {
             ID3v1TagField field = new ID3v1TagField(ID3v1FieldKey.YEAR.name(), getFirstYear());
             return returnFieldToList(field);
         }
         else
         {
             return new ArrayList<TagField>();
         }
     }
 
     public void addTrack(String track)
     {
         throw new UnsupportedOperationException("ID3v10 cannot store track numbers");
     }
 
     public String getFirstTrack()
     {
         throw new UnsupportedOperationException("ID3v10 cannot store track numbers");
     }
 
     public void setTrack(String track)
     {
         throw new UnsupportedOperationException("ID3v10 cannot store track numbers");
     }
 
     public List<TagField> getTrack()
     {
         throw new UnsupportedOperationException("ID3v10 cannot store track numbers");
     }
 
     public TagField getFirstField(String id)
     {
         List<TagField> results = null;
 
         if (TagFieldKey.ARTIST.name().equals(id))
         {
             results = getArtist();
         }
         else if (TagFieldKey.ALBUM.name().equals(id))
         {
             results = getAlbum();
         }
         else if (TagFieldKey.TITLE.name().equals(id))
         {
             results = getTitle();
         }
         else if (TagFieldKey.GENRE.name().equals(id))
         {
             results = getGenre();
         }
         else if (TagFieldKey.YEAR.name().equals(id))
         {
             results = getYear();
         }
         else if (TagFieldKey.COMMENT.name().equals(id))
         {
             results = getComment();
         }
 
         if (results != null)
         {
             if (results.size() > 0)
             {
                 return results.get(0);
             }
         }
         return null;
     }
 
     public Iterator<TagField> getFields()
     {
         throw new UnsupportedOperationException("TODO:Not done yet");
     }
 
     public boolean hasCommonFields()
     {
         //TODO
         return true;
     }
 
     public boolean hasField(String id)
     {
         //TODO
         throw new UnsupportedOperationException("TODO:Not done yet");
     }
 
     public boolean isEmpty()
     {
         if (getFirstTitle().length() > 0 || getFirstArtist().length() > 0 || getFirstAlbum().length() > 0 || getFirstGenre().length() > 0 || getFirstYear().length() > 0 || getFirstComment().length() > 0)
         {
             return false;
         }
         return true;
     }
 
 
     public void set(TagField field)
     {
         TagFieldKey genericKey = TagFieldKey.valueOf(field.getId());
         switch (genericKey)
         {
             case ARTIST:
                 setArtist(field.toString());
                 break;
 
             case ALBUM:
                 setAlbum(field.toString());
                 break;
 
             case TITLE:
                 setTitle(field.toString());
                 break;
 
             case GENRE:
                 setGenre(field.toString());
                 break;
 
             case YEAR:
                 setYear(field.toString());
                 break;
 
             case COMMENT:
                 setComment(field.toString());
                 break;
         }
     }
 
     /**
      * @param encoding
      * @return
      */
     public boolean setEncoding(String encoding)
     {
         return true;
     }
 
     /**
      * Create Tag Field using generic key
      */
     public TagField createTagField(TagFieldKey genericKey, String value)
     {
         return new ID3v1TagField(tagFieldToID3v1Field.get(genericKey).name(), value);
     }
 
     public String getEncoding()
     {
         return "ISO-8859-1";
     }
 
     public TagField getFirstField(TagFieldKey genericKey)
     {
         List<TagField> l = get(genericKey);
         return (l.size() != 0) ? l.get(0) : null;
     }
 
     /**
      * Returns a {@linkplain List list} of {@link TagField} objects whose &quot;{@linkplain TagField#getId() id}&quot;
      * is the specified one.<br>
      *
      * @param genericKey The generic field key
      * @return A list of {@link TagField} objects with the given &quot;id&quot;.
      */
     public List<TagField> get(TagFieldKey genericKey)
     {
         switch (genericKey)
         {
             case ARTIST:
                 return getArtist();
 
             case ALBUM:
                 return getAlbum();
 
             case TITLE:
                 return getTitle();
 
             case GENRE:
                 return getGenre();
 
             case YEAR:
                 return getYear();
 
             case COMMENT:
                 return getComment();
 
             default:
                 return new ArrayList<TagField>();
         }
     }
 
 
     /**
      * Retrieve the first value that exists for this key id
      *
      * @param genericKey
      * @return
      */
     public String getFirst(String genericKey)
     {
         TagFieldKey matchingKey = TagFieldKey.valueOf(genericKey);
         if (matchingKey != null)
         {
             return getFirst(matchingKey);
         }
         else
         {
             return "";
         }
     }
 
 
     /**
      * Retrieve the first value that exists for this generic key
      *
      * @param genericKey
      * @return
      */
     public String getFirst(TagFieldKey genericKey)
     {
         switch (genericKey)
         {
             case ARTIST:
                 return getFirstArtist();
 
             case ALBUM:
                 return getFirstAlbum();
 
             case TITLE:
                 return getFirstTitle();
 
             case GENRE:
                 return getFirstGenre();
 
             case YEAR:
                 return getFirstYear();
 
             case TRACK:
                 return getFirstTrack();
 
             case COMMENT:
                 return getFirstComment();
 
             default:
                 return "";
         }
     }
 
     /**
      * Delete any instance of tag fields with this key
      *
      * @param genericKey
      */
     public void deleteTagField(TagFieldKey genericKey)
     {
         switch (genericKey)
         {
             case ARTIST:
                 setArtist("");
                 break;
 
             case ALBUM:
                 setAlbum("");
                 break;
 
             case TITLE:
                 setTitle("");
                 break;
 
             case GENRE:
                 setGenre("");
                 break;
 
             case YEAR:
                 setYear("");
                 break;
 
             case COMMENT:
                 setComment("");
                 break;
         }
     }
 
     /**
      * @param obj
      * @return true if this and obj are equivalent
      */
     public boolean equals(Object obj)
     {
         if ((obj instanceof ID3v1Tag) == false)
         {
             return false;
         }
         ID3v1Tag object = (ID3v1Tag) obj;
         if (this.album.equals(object.album) == false)
         {
             return false;
         }
         if (this.artist.equals(object.artist) == false)
         {
             return false;
         }
         if (this.comment.equals(object.comment) == false)
         {
             return false;
         }
         if (this.genre != object.genre)
         {
             return false;
         }
         if (this.title.equals(object.title) == false)
         {
             return false;
         }
         if (this.year.equals(object.year) == false)
         {
             return false;
         }
         return super.equals(obj);
     }
 
     /**
      * @return an iterator to iterate through the fields of the tag
      */
     public Iterator iterator()
     {
         return new ID3v1Iterator(this);
     }
 
 
     /**
      * @param byteBuffer
      * @throws TagNotFoundException
      */
     public void read(ByteBuffer byteBuffer) throws TagNotFoundException
     {
         if (seek(byteBuffer) == false)
         {
             throw new TagNotFoundException(getLoggingFilename() + ":" + "ID3v1 tag not found");
         }
         logger.finer(getLoggingFilename() + ":" + "Reading v1 tag");
         //Do single file read of data to cut down on file reads
         byte[] dataBuffer = new byte[TAG_LENGTH];
         byteBuffer.position(0);
         byteBuffer.get(dataBuffer, 0, TAG_LENGTH);
         title = Utils.getString(dataBuffer, FIELD_TITLE_POS, this.FIELD_TITLE_LENGTH, "ISO-8859-1").trim();
         Matcher m = endofStringPattern.matcher(title);
         if (m.find() == true)
         {
             title = title.substring(0, m.start());
         }
         artist = Utils.getString(dataBuffer, FIELD_ARTIST_POS, this.FIELD_ARTIST_LENGTH, "ISO-8859-1").trim();
         m = endofStringPattern.matcher(artist);
         if (m.find() == true)
         {
             artist = artist.substring(0, m.start());
         }
         album = Utils.getString(dataBuffer, FIELD_ALBUM_POS, this.FIELD_ALBUM_LENGTH, "ISO-8859-1").trim();
         m = endofStringPattern.matcher(album);
         logger.finest(getLoggingFilename() + ":" + "Orig Album is:" + comment + ":");
         if (m.find() == true)
         {
             album = album.substring(0, m.start());
             logger.finest(getLoggingFilename() + ":" + "Album is:" + album + ":");
         }
         year = Utils.getString(dataBuffer, FIELD_YEAR_POS, this.FIELD_YEAR_LENGTH, "ISO-8859-1").trim();
         m = endofStringPattern.matcher(year);
         if (m.find() == true)
         {
             year = year.substring(0, m.start());
         }
         comment = Utils.getString(dataBuffer, FIELD_COMMENT_POS, this.FIELD_COMMENT_LENGTH, "ISO-8859-1").trim();
         m = endofStringPattern.matcher(comment);
         logger.finest(getLoggingFilename() + ":" + "Orig Comment is:" + comment + ":");
         if (m.find() == true)
         {
             comment = comment.substring(0, m.start());
             logger.finest(getLoggingFilename() + ":" + "Comment is:" + comment + ":");
         }
         genre = dataBuffer[this.FIELD_GENRE_POS];
 
     }
 
     /**
      * Does a tag of this version exist within the byteBuffer
      *
      * @return whether tag exists within the byteBuffer
      */
     public boolean seek(ByteBuffer byteBuffer)
     {
         byte[] buffer = new byte[FIELD_TAGID_LENGTH];
         // read the TAG value
         byteBuffer.get(buffer, 0, FIELD_TAGID_LENGTH);
         return (Arrays.equals(buffer, TAG_ID));
     }
 
     /**
      * Write this tag to the file, replacing any tag previously existing
      *
      * @param file
      * @throws IOException
      */
     public void write(RandomAccessFile file) throws IOException
     {
         logger.info("Saving ID3v1 tag to file");
         byte[] buffer = new byte[TAG_LENGTH];
         int i;
         String str;
         delete(file);
         file.seek(file.length());
         //Copy the TAGID into new buffer
         System.arraycopy(TAG_ID, this.FIELD_TAGID_POS, buffer, this.FIELD_TAGID_POS, TAG_ID.length);
         int offset = this.FIELD_TITLE_POS;
         if (TagOptionSingleton.getInstance().isId3v1SaveTitle())
         {
             str = ID3Tags.truncate(title, this.FIELD_TITLE_LENGTH);
             for (i = 0; i < str.length(); i++)
             {
                 buffer[i + offset] = (byte) str.charAt(i);
             }
         }
         offset = this.FIELD_ARTIST_POS;
         if (TagOptionSingleton.getInstance().isId3v1SaveArtist())
         {
             str = ID3Tags.truncate(artist, this.FIELD_ARTIST_LENGTH);
             for (i = 0; i < str.length(); i++)
             {
                 buffer[i + offset] = (byte) str.charAt(i);
             }
         }
         offset = this.FIELD_ALBUM_POS;
         if (TagOptionSingleton.getInstance().isId3v1SaveAlbum())
         {
             str = ID3Tags.truncate(album, this.FIELD_ALBUM_LENGTH);
             for (i = 0; i < str.length(); i++)
             {
                 buffer[i + offset] = (byte) str.charAt(i);
             }
         }
         offset = this.FIELD_YEAR_POS;
         if (TagOptionSingleton.getInstance().isId3v1SaveYear())
         {
             str = ID3Tags.truncate(year, AbstractID3v1Tag.FIELD_YEAR_LENGTH);
             for (i = 0; i < str.length(); i++)
             {
                 buffer[i + offset] = (byte) str.charAt(i);
             }
         }
         offset = this.FIELD_COMMENT_POS;
         if (TagOptionSingleton.getInstance().isId3v1SaveComment())
         {
             str = ID3Tags.truncate(comment, this.FIELD_COMMENT_LENGTH);
             for (i = 0; i < str.length(); i++)
             {
                 buffer[i + offset] = (byte) str.charAt(i);
             }
         }
         offset = this.FIELD_GENRE_POS;
         if (TagOptionSingleton.getInstance().isId3v1SaveGenre())
         {
             buffer[offset] = genre;
         }
         file.write(buffer);
         logger.info("Saved ID3v1 tag to file");
     }
 
     /**
      * Create strcutured representation of this item.
      */
     public void createStructure()
     {
         MP3File.getStructureFormatter().openHeadingElement(TYPE_TAG, getIdentifier());
         //Header
         MP3File.getStructureFormatter().addElement(TYPE_TITLE, this.title);
         MP3File.getStructureFormatter().addElement(TYPE_ARTIST, this.artist);
         MP3File.getStructureFormatter().addElement(TYPE_ALBUM, this.album);
         MP3File.getStructureFormatter().addElement(TYPE_YEAR, this.year);
         MP3File.getStructureFormatter().addElement(TYPE_COMMENT, this.comment);
         MP3File.getStructureFormatter().addElement(TYPE_GENRE, this.genre);
         MP3File.getStructureFormatter().closeHeadingElement(TYPE_TAG);
     }
 
     public List<Artwork> getArtworkList()
     {
        return Collections.emptyList();
     }
 
     public Artwork getFirstArtwork()
     {           
         return null;
     }
 
     public TagField  createArtworkField(Artwork artwork) throws FieldDataInvalidException
     {
         throw new UnsupportedOperationException("Not implemented for this format");
     }
 
     public void createAndSetArtworkField(Artwork artwork) throws FieldDataInvalidException
     {
         throw new UnsupportedOperationException("Not implemented for this format");
     }
 }