/*
 * 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.gameserver.network.loginserverpackets;

/**
 * @author -Wooden-
 */
public abstract class LoginServerBasePacket
{
	private final byte[] _decrypt;
	private int _off;

	public LoginServerBasePacket(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()
	{
		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(int length)
	{
		byte[] result = new byte[length];
		for (int i = 0; i < length; i++)
		{
			result[i] = _decrypt[_off + i];
		}
		_off += length;
		return result;
	}
}