UFOInputStream.java

/*
 *  UFO Saved Game Editor
 *  Copyright (C) 2010 Christopher Davoren
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.rubikscomplex.ufosge.util;

import java.io.DataInputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;


/**
 *
 * @author Chris Davoren
 */
public class UFOInputStream extends DataInputStream {
    public UFOInputStream(InputStream in) {
        super(in);
    }

    public Short readUFOByte() throws IOException {
        byte theByte = readByte();

        return (short)((int)theByte & 0xFF);
    }

    public short readUFOShort() throws IOException, EOFException {
        byte lower = readByte();
        byte upper = readByte();

        return (short)((lower & 0xFF) | (upper << 8));
    }

    public int readUFOInt() throws IOException, EOFException {
        byte byte1 = readByte();
        byte byte2 = readByte();
        byte byte3 = readByte();
        byte byte4 = readByte();

        return (int)((byte1 & 0xFF) | ((byte2 << 8) & 0xFF00) | ((byte3 << 16) & 0xFF0000) | (byte4 << 24));
    }

    public String readUFOString(int maxlen) throws IOException, EOFException {
        byte[] stringBytes = new byte[maxlen];
        StringBuffer sb = new StringBuffer(maxlen);
        int strpos = 0;

        read(stringBytes);

        while (stringBytes[strpos] != 0) {
            sb.append((char)stringBytes[strpos]);
            strpos++;
        }

        return sb.toString();
    }
}