/*
 * 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 silentium.authserver.network.clientpackets;

/**
 * This class ...
 *
 * @version $Revision: 1.2.4.1 $ $Date: 2005/03/27 15:30:12 $
 */
public abstract class ClientBasePacket {
	private final byte[] _decrypt;
	private int _off;

	public ClientBasePacket(final byte... decrypt) {
		_decrypt = decrypt;
		_off = 1; // skip packet type id
	}

	public int readD() {
		int result = _decrypt[_off++] & 0xff;
		result |= _decrypt[_off++] << 8 & 0xff00;
		result |= _decrypt[_off++] << 0x10 & 0xff0000;
		result |= _decrypt[_off++] << 0x18 & 0xff000000;
		return result;
	}

	public int readC() {
		final int result = _decrypt[_off++] & 0xff;
		return result;
	}

	public int readH() {
		int result = _decrypt[_off++] & 0xff;
		result |= _decrypt[_off++] << 8 & 0xff00;
		return result;
	}

	public double readF() {
		long result = _decrypt[_off++] & 0xff;
		result |= _decrypt[_off++] << 8 & 0xff00;
		result |= _decrypt[_off++] << 0x10 & 0xff0000;
		result |= _decrypt[_off++] << 0x18 & 0xff000000;
		result |= _decrypt[_off++] << 0x20 & 0xff00000000l;
		result |= _decrypt[_off++] << 0x28 & 0xff0000000000l;
		result |= _decrypt[_off++] << 0x30 & 0xff000000000000l;
		result |= _decrypt[_off++] << 0x38 & 0xff00000000000000l;
		return Double.longBitsToDouble(result);
	}

	public String readS() {
		String result = null;
		try {
			result = new String(_decrypt, _off, _decrypt.length - _off, "UTF-16LE");
			result = result.substring(0, result.indexOf(0x00));
			_off += result.length() * 2 + 2;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}

	public final byte[] readB(final int length) {
		final byte[] result = new byte[length];
		System.arraycopy(_decrypt, _off, result, 0, length);
		_off += length;
		return result;
	}
}