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The FACT telescope is a Cherenkov telescope on the island of La Palma. This set of tools is dedicated to read, parse and process raw data produced by the FACT telescope.

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package fact.io.zfits;

import stream.util.parser.ParseException;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;

/**
 * This class encapsulates the catalog describing the position and sizes of the table entries.
 * 
 * @author Michael Bulinski <[email protected]>
 */
public class Catalog {
	private int numTiles;
	private int numCols; 
	private long[][] offsetList;
	private long[][] sizeList;
	private long[] tileOffsetList;
	private long[] tileSizeList;

	/**
	 * Load the catalog of the position and sizes of the table entries.
	 * 
	 * @param input The catalog data to read.
	 * @param numTiles The number of tiles in the table.
	 * @param numCols The number of columns in the table.
	 * @throws ParseException Thrown when the catalog is broken.
	 */
	Catalog(byte[] input, int numTiles, int numCols) throws ParseException {
		this.numTiles = numTiles;
		this.numCols = numCols;
		ByteBuffer buffer = ZFitsUtil.wrap(input);
		buffer.order(ByteOrder.BIG_ENDIAN);
		
		//int expectedCatalogSize = 2*numTiles*numCols*8;
		//if ( input.length !=  expectedCatalogSize)
		//	throw new ParseException("The catalog has : "+input.length+" bytes, this is to many or not enough entries. Expected: "+expectedCatalogSize+" bytes.");
		this.offsetList = new long[numTiles][numCols];
		this.sizeList   = new long[numTiles][numCols];
		this.tileOffsetList = new long[numTiles];
		this.tileSizeList   = new long[numTiles];

		//load the catalog
		for (int i=0; i