package org.jaudiotagger.audio.asf.io;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.RandomAccessFile;

 /**

  * Wraps a {@link RandomAccessFile} into an {@link InputStream}.<br>

  * @author Christian Laireiter

  */

 public final class RandomAccessFileInputstream extends InputStream

 {

     /**

      * The file access to read from.<br>

      */

     private final RandomAccessFile source;

     /**

      * Creates an instance that will provide {@link InputStream} functionality on the given

      * {@link RandomAccessFile} by delegating calls.<br>

      * 

      * @param file The file to read.

      */

     public RandomAccessFileInputstream(final RandomAccessFile file)

     {

         if (file == null)

         {

             throw new NullPointerException();

         }

         this.source = file;

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public int read() throws IOException

     {

         return this.source.read();

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public int read(byte[] b, int off, int len) throws IOException

     {

         return this.source.read(b, off, len);

     }

    /**

      * {@inheritDoc}

      */

     @Override

     public long skip(long n) throws IOException

     {

         if (n <= 0)

         {

             return 0;

         }

         while (n > Integer.MAX_VALUE)

         {

             this.source.skipBytes(Integer.MAX_VALUE);

             n -= Integer.MAX_VALUE;

         }

         return this.source.skipBytes((int) n);

     }

 }