// Copyright (C) 1998, 1999, 2001 Chris Nokleberg// Please see included LICENSE.TXTpackage com.sixlegs.image.png;import java.io.IOException;final class Chunk_sCALextends Chunk{    Chunk_sCAL()    {        super(sCAL);    }    protected boolean multipleOK()    {        return false;    }    protected boolean beforeIDAT()    {        return true;    }    protected void readData()    throws IOException    {        int unit = in_data.readUnsignedByte();        if (unit != PngImage.UNIT_METER && unit != PngImage.UNIT_RADIAN)            throw new PngExceptionSoft("Illegal sCAL chunk unit specifier: " + unit);        String pixelWidthStr = in_data.readString();        int limit = length - pixelWidthStr.length() + 2;        try {            double pixelWidth = in_data.parseFloatingPoint(pixelWidthStr);            double pixelHeight = in_data.parseFloatingPoint(in_data.readString(limit));            if (pixelWidth < 0 || pixelHeight < 0) throw new NumberFormatException();            img.data.properties.put("pixel scale x", new Double(pixelWidth));            img.data.properties.put("pixel scale y", new Double(pixelHeight));            img.data.properties.put("pixel scale unit", new Integer(unit));        } catch (NumberFormatException e) {            throw new PngExceptionSoft("Bad floating point value in sCAL chunk");        }    }    }