Class FitsReader

ij/src/main/java/ij/astro/io/FitsReader.java:63–1034

import nom.tam.util.Cursor;

public class FitsReader implements AutoCloseable {
    public static boolean skipTessQualCheck = Prefs.getBoolean(".aij.skipTessQualCheck", false);
    private static final LeapSeconds LEAP_SECONDS = new LeapSeconds();
    private final Fits fits;
    private final List<HDUDescriptor> hduDescriptors;
    private final BasicHDU<?>[] hdus;
    private int firstImageIndex = -1;
    private int width = 0;
    private int height = 0;
    private int depth = 0;
    private double bZero = 0.0;
    private double bScale = 0.0;
    private final String directory;
    public final String fileName;
    public String fileBase;
    public String fileType;
    private ImageProcessor[] cachedProcessors;
    private String[] cachedHeaders;
    private boolean isMeasurementsTable;

    private FitsReader(Path path, String directory, String fileName) throws IOException {
        FitsFactory.setAllowHeaderRepairs(true);
        this(new Fits(path.toFile()), directory, fileName);
    }

    private FitsReader(Fits fits, String directory, String fileName) throws IOException {
        this.directory = directory;
        this.fileName = fileName;
        this.fits = fits;
        this.hdus = fits.read(); // Reads to end of File, and for RandomAccess files skips reading data
        hduDescriptors = new ArrayList<>(fits.getNumberOfHDUs());

        for (int i = 0; i < fits.getNumberOfHDUs(); i++) {
            hduDescriptors.add(new HDUDescriptor(fits.getHDU(i)));
        }

        setupImageData();
    }

    public static FitsReader create(String path) throws IOException {
        OpenDialog od = new OpenDialog("Open FITS...", path);
        var directory = od.getDirectory();
        var fileName = od.getFileName();
        if (fileName == null) {
            throw new FitsException("Null filename.");
        }

        IJ.showStatus("Opening: " + directory + fileName);

        if (isFileWithinZip(path)) {
            var s = path.split("\\.zip");

            try (var zip = new ZipFile(s[0] + ".zip")) {
                var m = new ProgressMonitorInputStream(IJ.getInstance(),
                        "Reading FITS image", zip.getInputStream(zip.getEntry(s[1].substring(1))));
                FitsFactory.setAllowHeaderRepairs(true);
                return new FitsReader(new Fits(m), directory, fileName);
            }