package org.jaudiotagger.audio.real;

 import java.io.ByteArrayInputStream;

 import java.io.DataInputStream;

 import java.io.IOException;

 import java.io.RandomAccessFile;

 import org.jaudiotagger.audio.exceptions.CannotReadException;

 import org.jaudiotagger.audio.generic.Utils;

 public class RealChunk {

         protected static final String RMF = ".RMF";

         protected static final String PROP = "PROP";

         protected static final String MDPR = "MDPR";

         protected static final String CONT = "CONT";

         protected static final String DATA = "DATA";

         protected static final String INDX = "INDX";

         private final String id;

         private final int size;

         private final byte[] bytes;

         public static RealChunk readChunk(RandomAccessFile raf)

                         throws CannotReadException, IOException {

                 final String id = Utils.readString(raf, 4);

                 final int size = Utils.readUint32AsInt(raf);

                 if (size < 8) {

                         throw new CannotReadException(

                                         "Corrupt file: RealAudio chunk length at position "

                                                         + (raf.getFilePointer() - 4)

                                                         + " cannot be less than 8");

                 }

                 if (size > (raf.length() - raf.getFilePointer() + 8)) {

                         throw new CannotReadException(

                                         "Corrupt file: RealAudio chunk length of " + size

                                                         + " at position " + (raf.getFilePointer() - 4)

                                                         + " extends beyond the end of the file");

                 }

                 final byte[] bytes = new byte[size - 8];

                 raf.readFully(bytes);

                 return new RealChunk(id, size, bytes);

         }

         public RealChunk(String id, int size, byte[] bytes) {

                 super();

                 this.id = id;

                 this.size = size;

                 this.bytes = bytes;

         }

         public DataInputStream getDataInputStream() {

                 return new DataInputStream(new ByteArrayInputStream(getBytes()));

         }

         public boolean isCONT() {

                 return CONT.equals(id);

         }

         public boolean isPROP() {

                 return PROP.equals(id);

         }

         public byte[] getBytes() {

                 return bytes;

         }

         public String getId() {

                 return id;

         }

         public int getSize() {

                 return size;

         }

         @Override

         public String toString() {

                 return id + "\t" + size;

         }

 }