?? pixelinputstream.java
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// 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; }}
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