/*

  * Entagged Audio Tag library

  * Copyright (c) 2003-2005 Rapha�l Slinckx <raphael@slinckx.net>

  * 

  * 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, write to the Free Software

  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

  */

 package org.jaudiotagger.audio.flac;

 import org.jaudiotagger.audio.exceptions.CannotReadException;

 import org.jaudiotagger.audio.flac.metadatablock.MetadataBlockDataPicture;

 import org.jaudiotagger.audio.flac.metadatablock.MetadataBlockHeader;

 import org.jaudiotagger.tag.InvalidFrameException;

 import org.jaudiotagger.tag.flac.FlacTag;

 import org.jaudiotagger.tag.vorbiscomment.VorbisCommentReader;

 import org.jaudiotagger.tag.vorbiscomment.VorbisCommentTag;

 import java.io.IOException;

 import java.io.RandomAccessFile;

 import java.util.ArrayList;

 import java.util.List;

 import java.util.logging.Logger;

 /**

  * Read Flac Tag

  */

 public class FlacTagReader

 {

     // Logger Object

     public static Logger logger = Logger.getLogger("org.jaudiotagger.audio.flac");

     private VorbisCommentReader vorbisCommentReader = new VorbisCommentReader();

     public FlacTag read(RandomAccessFile raf) throws CannotReadException, IOException

     {

         FlacStreamReader flacStream = new FlacStreamReader(raf);

         flacStream.findStream();

         //Hold the metadata

         VorbisCommentTag tag = null;

         List<MetadataBlockDataPicture> images = new ArrayList<MetadataBlockDataPicture>();

         //Seems like we have a valid stream

         boolean isLastBlock = false;

         while (!isLastBlock)

         {

             //Read the header

             MetadataBlockHeader mbh = MetadataBlockHeader.readHeader(raf);

             //Is it one containing some sort of metadata, therefore interested in it?

             switch (mbh.getBlockType())

             {

                 //We got a vorbiscomment comment block, parse it

                 case VORBIS_COMMENT:

                     byte[] commentHeaderRawPacket = new byte[mbh.getDataLength()];

                     raf.read(commentHeaderRawPacket);

                     tag = vorbisCommentReader.read(commentHeaderRawPacket, false);

                     break;

                 case PICTURE:

                     try

                     {

                         MetadataBlockDataPicture mbdp = new MetadataBlockDataPicture(mbh, raf);

                         images.add(mbdp);

                     }

                     catch (IOException ioe)

                     {

                         logger.warning("Unable to read picture metablock, ignoring:" + ioe.getMessage());

                     }

                     catch (InvalidFrameException ive)

                     {

                         logger.warning("Unable to read picture metablock, ignoring" + ive.getMessage());

                     }

                     break;

                     //This is not a metadata block we are interested in so we skip to next block

                 default:

                     raf.seek(raf.getFilePointer() + mbh.getDataLength());

                     break;

             }

             isLastBlock = mbh.isLastBlock();

             mbh = null;

         }

         //Note there may not be either a tag or any images, no problem this is valid however to make it easier we

         //just initialize Flac with an empty VorbisTag

         if (tag == null)

         {

             tag = VorbisCommentTag.createNewTag();

         }

         FlacTag flacTag = new FlacTag(tag, images);

         return flacTag;

     }

 }