// Copyright (C) 1998, 1999, 2001 Chris Nokleberg// Please see included LICENSE.TXTpackage com.sixlegs.image.png;import java.io.IOException;import java.io.InputStream;final class PixelInputStream{    final private BitMover mover;    final private InputStream str;    final private int[] leftover = new int[8];    private int leftamt = 0;    /* package */ final int fillSize;    PixelInputStream(PngImage img, InputStream str)    throws PngException    {        this.str = str;        fillSize = Math.max(1, 8 / img.data.header.depth);        mover = BitMover.getBitMover(img);    }    int read(int b[], int off, int len)    throws IOException    {        int needed = len;        int total = len;        if (leftamt > 0) {            int fromleft = (needed > leftamt ? leftamt : needed);            System.arraycopy(leftover, 8 - leftamt, b, off, fromleft);            needed -= fromleft;            leftamt -= fromleft;        }        if (needed > 0) {            off = mover.fill(b, str, off, needed / fillSize);            needed %= fillSize;            if (needed > 0) {                leftamt = fillSize - needed;                mover.fill(leftover, str, 8 - fillSize, 1);                System.arraycopy(leftover, 8 - fillSize, b, off, needed);            }        }        return total;    }}