Does NIO support buffering of via FileChannel

Question

I needed to write some code that went though a file looking for a 2byte marker, when it found the marker it read some additional data from the file, having read the additional data it would either return true together with the offset where the marker was found or it would decide to continue lokking for another 2 byte marker from the location it originally found one , and so on.
Before NIO I tried to do this with a BufferedFileInputStream, but this was no good to me because it didnt give me a filepointer to identify where I was in the file. So I used RandomAccessFile instead which gave me the functionality required.
But I revisited the code and realised that no buffereing was taking place and therefore the search for the marker was expensive if it was not at the front of the file. I decided to rewrite the code using FileChannels.
What I found was that FileChannels offer no buffering and on my first attempt performance was worse then before. I then implemented my own crude buffering by reading a chunk of the file into a Buffer from a filechannel, and searching througfh the buffer for the marker, if I got to the end of the buffer I would then have to write the next chunk into the buffer. but in order to do this I have to increment the position of the buffer and the FileChannel as they are independent, this is quite an expensive operation as I am performing it many times.
Is there a better way of doing this, what i would like is the buffer to be linked to the FileChannel in a way that there is a shared position

Answer 1

Ok, BUFFER_CHUNK_SIZE is fairly arbitary but my read chunks into the buffer I hope to reduce the file IO, if I find a match I need the fc.position()
for my SetSyncLocation() method.
public boolean seek(final File seekFile)
        final FileInputStream     fis = new FileInputStream(seekFile);
        final FileChannel fc = fis.getChannel();
        //Read into Byte Buffer in Chunks
        ByteBuffer  bb = ByteBuffer.allocateDirect(BUFFER_CHUNK_SIZE);
        fc.read(bb,0);
        bb.flip();
        boolean syncFound  = false;
        try
            do
                if(bb.remaining()==SYNC_SIZE)
                    bb.clear();
                    fc.read(bb,fc.position());
                    bb.flip();
                    if(bb.limit()<=SYNC_SIZE)
                        return false;
                if(isSync(bb))
                    try
                        widget = parseFile(bb);
                        syncFound = true;
                    catch (InvalidAudioFrameException ex)
                        // We Ignore because likely to be incorrect sync bits ,
                        // will just continue in loop
                bb.position(bb.position()+1);
                fc.position(fc.position()+1);
            while(!syncFound);
        catch (EOFException ex)
            ex.printStackTrace();
            syncFound = false;
        setSyncLocation(fc.position());
        return true;
}