FileSKUHeader.java

package edu.colostate.vchill.file;

import edu.colostate.vchill.ChillDefines;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

/**
 * Reads SKU Header of CHILL file
 *
 * @author Justin Carlson
 * @author Brian Eriksson
 * @author Jochen Deyke
 * @version 2006-03-31
 * @created June 17, 2003
 */
class FileSKUHeader {
    public static final int BYTE_SIZE = 5 * ChillDefines.INT_BYTE_SIZE;

    /**
     * Set to all 0xF0 thus making an 8 byte block of F0s.
     */
    public int code1, code2;
    public static final int correctCode = 0xf0f0f0f0;

    /**
     * Set to either GATE_PARAMS_PACKET_CODE or a ray data block GATE_DATA_PACKET_CODE
     */
    public int id;

    /**
     * The length word indicates the length in bytes of the data block which follows.
     */
    public int length;

    public int msgnum;

    /**
     * Returns whether or not the SKU Header is the header for a sweep
     *
     * @return True if SKU Header is for a sweep
     */
    public boolean isSweep() {
        if (id == 0) return true;
        return false;
    }

    /**
     * Reads the SKUHeader from the CHILL file
     *
     * @param in DataInput object of CHILL file being read
     * @return Boolean false if IOException is thrown, true if not thrown
     */
    public boolean inputData(final DataInput in) {
        try {
            this.code1 = in.readInt(); //assert this.code1 == correctCode : "code1 was " + this.code1;
            if (this.code1 != correctCode) {
                System.err.println("code1 was " + this.code1);
                return false;
            }
            this.code2 = in.readInt(); //assert this.code2 == correctCode : "code2 was " + this.code2;
            if (this.code2 != correctCode) {
                System.err.println("code2 was " + this.code2);
                return false;
            }
            this.id = in.readInt();
            this.length = in.readInt();
            this.msgnum = in.readInt();
            return true;
        } catch (IOException e) {
            return false;
        }
    }

    /**
     * Writes the SKUHeader to the CHILL file
     *
     * @param out DataOutput object of CHILL file being read
     * @return Boolean false if IOException is thrown, true if not thrown
     */
    public boolean outputData(final DataOutput out) {
        try {
            out.writeInt(this.code1);
            out.writeInt(this.code2);
            out.writeInt(this.id);
            out.writeInt(this.length);
            out.writeInt(this.msgnum);
            return true;
        } catch (IOException e) {
            return false;
        }
    }
}