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From: markspace <markspace@nospam.nospam>
Newsgroups: comp.lang.java.programmer
Subject: Re: byte stream vs char stream buffer
Date: Sun, 11 May 2014 12:10:54 -0700
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I think this might be the original code that I used to speed up my 
project.  It's been a while so I don't know exactly how well this is 
working right now.

You can wrap this in whatever you'd like -- BufferedRead for example -- 
since I just make a plain InputStream here.  I also notice that there's 
not even a close method on this class, so obviously I didn't complete it.

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;

/**
  * Copyright 2013 Brenden Towey DONATED TO THE PUBLIC DOMAIN.
  *
  * PROVIDED AS-IS WITH NO WARRANTY.  FURTHER TESTING IS
  * REQUIRED TO COMPLETE THIS CODE.  CAVEAT EMPTOR.
  *
  * @author Brenden Towey
  */
public class FileByteBufferInputStream extends InputStream {

    private ByteBuffer buffer = ByteBuffer.allocateDirect( 64 * 1024 );
    private FileInputStream file;
    int read;
    boolean eof = false;

    public FileByteBufferInputStream( FileInputStream file ) throws 
IOException
    {
       this.file = file;
       read = file.getChannel().read( buffer );
       if( read == -1 ) eof = true;
       buffer.rewind();
    }

    @Override
    public int read()
            throws IOException
    {
       if( eof ) return -1;
       if( read-- == 0 )
       {
          buffer.clear();
          read = file.getChannel().read( buffer );
          if( read == -1 ) eof = true;
          buffer.rewind();
          if( eof ) {
             return -1;
          } else {
             int retval = buffer.get();
             assert( read > 0 );
             read--;
             return retval;
          }
       } else{
          int retval = buffer.get();
          return retval;
       }
    }
}