Examples of org.farng.mp3.InvalidTagException

org.farng.mp3.InvalidTagException
An InvalidTagException is thrown if a parse error occurs while a tag is being read from a file. This is different from a TagNotFoundException. Each tag (or MP3 Frame Header) has an ID string or some way saying that it simply exists. If this string is missing, TagNotFoundException is thrown. If the ID string exists, then any other error while reading throws an InvalidTagException. @author Eric Farng @version $Revision: 1.1 $

   * Construst a SongData from an MP3 at the given absolute path
   * @param path the absolute path of the MP3
   */
  public SongData( String path ) throws SongDataException {
    this.path = tagPrep(path);
    AbstractMP3Tag tag = null;
        try {
      MP3File mp3file = new MP3File(path);
      if (mp3file.hasID3v2Tag()) {
        tag = mp3file.getID3v2Tag();
      } else if (mp3file.hasID3v1Tag()) {
        tag = mp3file.getID3v1Tag();
      } else {
        throw new SongDataException( "No MP3 ID tag found for \""+path+"\"" );
      }
        } catch (TagException tE) {
            throw new SongDataException( "(TagException) Broken MP3 ID tag found for \""+path+"\"" );
        } catch (IOException ioE) {
            log.warn("", ioE);
            throw new SongDataException( "IOE for \""+path+"\"" );
    }


    try { //unfortunately jd3lib isn't perfect...grr...
      title = tagPrep(tag.getSongTitle());
      album = tagPrep(tag.getAlbumTitle());
      artist = tagPrep(tag.getLeadArtist());
            genre = tagPrep(tag.getSongGenre());
            if (genre.length() > 1) { // ensure that genres do not have mutiples because of case
                char firstChar = genre.toUpperCase().charAt(0);
                genre = firstChar+genre.substring(1);
            }
            track = Integer.parseInt(tag.getTrackNumberOnAlbum());


        } catch (NullPointerException npE) {
      throw new SongDataException( "(NPE) Broken MP3 ID tag found for \""+path+"\"" );
    } catch (NumberFormatException nfE) {
            log.warn("No track number for " + title);

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


        // read the SIZE length description
        file.read(buffer);

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


        // read the SIZE length description
        file.read(buffer);

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        final String identifier = new String(buffer, 0, 4);


        // is this a valid identifier?
        if (isValidID3v2FrameIdentifier(identifier) == false) {
            file.seek(file.getFilePointer() - 3);
            throw new InvalidTagException(identifier + " is not a valid ID3v2.30 frame");
        }
        filePointer = file.getFilePointer();


        // skip the 4 byte size
        file.skipBytes(4);

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


        // read the SIZE length description
        file.read(buffer);

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


        // read the SIZE length description
        file.read(buffer);

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            // int is 4 bytes.
            final int extendedHeaderSize = file.readInt();


            // the extended header must be atleast 6 bytes
            if (extendedHeaderSize <= 6) {
                throw new InvalidTagException("Invalid Extended Header Size.");
            }
            final byte numberOfFlagBytes = file.readByte();


            // read the flag bytes
            file.read(buffer, 0, numberOfFlagBytes);

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        // 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;
    }

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        file.read(buffer, 0, 3);
        final String identifier = new String(buffer, 0, 3);


        // is this a valid identifier?
        if (TagUtility.isLyrics3v2FieldIdentifier(identifier) == false) {
            throw new InvalidTagException(identifier + " is not a valid ID3v2.4 frame");
        }
        this.setBody(readBody(identifier, file));
    }

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    }


    public void read(final RandomAccessFile file) throws IOException, InvalidTagException {
        final int size = readHeader(file);
        if (size == 0) {
            throw new InvalidTagException("Empty Frame");
        }
        dataStart = file.readInt();
        dataLength = file.readInt();
        indexPoints = (int) file.readShort();
        bitsPerPoint = (int) file.readByte();
        fraction = new short[indexPoints];
        for (int i = 0; i < indexPoints; i++) {
            if (bitsPerPoint == 8) {
                fraction[i] = (short) file.readByte();
            } else if (bitsPerPoint == 16) {
                fraction[i] = file.readShort();
            } else {
                throw new InvalidTagException("ASPI bits per point wasn't 8 or 16");
            }
        }
    }

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