/*
* #%L
* BSD implementations of Bio-Formats readers and writers
* %%
* Copyright (C) 2005 - 2015 Open Microscopy Environment:
* - Board of Regents of the University of Wisconsin-Madison
* - Glencoe Software, Inc.
* - University of Dundee
* %%
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* #L%
*/
package loci.formats.in;
import java.io.IOException;
import loci.common.DataTools;
import loci.common.RandomAccessInputStream;
import loci.formats.CoreMetadata;
import loci.formats.FormatException;
import loci.formats.FormatReader;
import loci.formats.FormatTools;
import loci.formats.MetadataTools;
import loci.formats.meta.MetadataStore;
/**
* FitsReader is the file format reader for
* Flexible Image Transport System (FITS) images.
*
* Much of this code was adapted from ImageJ (http://rsb.info.nih.gov/ij).
*/
public class FitsReader extends FormatReader {
// -- Constants --
private static final int LINE_LENGTH = 80;
// -- Fields --
private long pixelOffset;
// -- Constructor --
/** Constructs a new FitsReader. */
public FitsReader() {
super("Flexible Image Transport System", new String[] {"fits", "fts"});
domains =
new String[] {FormatTools.ASTRONOMY_DOMAIN, FormatTools.UNKNOWN_DOMAIN};
}
// -- IFormatReader API methods --
/**
* @see loci.formats.IFormatReader#openBytes(int, byte[], int, int, int, int)
*/
@Override
public byte[] openBytes(int no, byte[] buf, int x, int y, int w, int h)
throws FormatException, IOException
{
FormatTools.checkPlaneParameters(this, no, buf.length, x, y, w, h);
in.seek(pixelOffset + no * FormatTools.getPlaneSize(this));
readPlane(in, x, y, w, h, buf);
return buf;
}
/* @see loci.formats.IFormatReader#close(boolean) */
@Override
public void close(boolean fileOnly) throws IOException {
super.close(fileOnly);
if (!fileOnly) pixelOffset = 0;
}
// -- Internal FormatReader API methods --
/* @see loci.formats.FormatReader#initFile(String) */
@Override
protected void initFile(String id) throws FormatException, IOException {
super.initFile(id);
in = new RandomAccessInputStream(id);
CoreMetadata m = core.get(0);
String line = in.readString(LINE_LENGTH);
if (!line.startsWith("SIMPLE")) {
throw new FormatException("Unsupported FITS file.");
}
String key = "", value = "";
while (true) {
line = in.readString(LINE_LENGTH);
// parse key/value pair
int ndx = line.indexOf("=");
int comment = line.indexOf("/", ndx);
if (comment < 0) comment = line.length();
if (ndx >= 0) {
key = line.substring(0, ndx).trim();
value = line.substring(ndx + 1, comment).trim();
}
else key = line.trim();
// if the file has an extended header, "END" will appear twice
// the first time marks the end of the extended header
// the second time marks the end of the standard header
// image dimensions are only populated by the standard header
if (key.equals("END") && getSizeX() > 0) break;
if (key.equals("BITPIX")) {
int bits = Integer.parseInt(value);
boolean fp = bits < 0;
boolean signed = bits != 8;
bits = Math.abs(bits) / 8;
m.pixelType = FormatTools.pixelTypeFromBytes(bits, signed, fp);
}
else if (key.equals("NAXIS1")) m.sizeX = Integer.parseInt(value);
else if (key.equals("NAXIS2")) m.sizeY = Integer.parseInt(value);
else if (key.equals("NAXIS3")) m.sizeZ = Integer.parseInt(value);
addGlobalMeta(key, value);
}
while (in.read() == 0x20);
pixelOffset = in.getFilePointer() - 1;
m.sizeC = 1;
m.sizeT = 1;
if (getSizeZ() == 0) m.sizeZ = 1;
// correct for truncated files
int planeSize =
getSizeX() * getSizeY() * FormatTools.getBytesPerPixel(getPixelType());
if (DataTools.safeMultiply64(planeSize, getSizeZ()) >
(in.length() - pixelOffset))
{
m.sizeZ = (int) ((in.length() - pixelOffset) / planeSize);
}
m.imageCount = m.sizeZ;
m.rgb = false;
m.littleEndian = false;
m.interleaved = false;
m.dimensionOrder = "XYZCT";
m.indexed = false;
m.falseColor = false;
m.metadataComplete = true;
MetadataStore store = makeFilterMetadata();
MetadataTools.populatePixels(store, this);
}
}