package de.tudarmstadt.informatik.hostage.format;

import de.tudarmstadt.informatik.hostage.commons.HelperUtils;

/**
 * Telnet log view formatter.
 * 
 * @author Wulf Pfeiffer
 */
public class TELNETFormatter implements ProtocolFormatter {

	public String format(String packet) {
		byte[] bytes = HelperUtils.hexStringToBytes(packet);
		String options = "Options:\n" + checkForOptions(bytes) + "\n";
		String content = "Content: " + HelperUtils.byteToStr(bytes);
		return options + content;
	}

	/**
	 * Checks a packet for option commands and returns their names as Strings.
	 * 
	 * @param bytes
	 *            that are checked.
	 * @return names of the option commands as String.
	 */
	private String checkForOptions(byte[] bytes) {
		StringBuffer options = new StringBuffer();
		for (int i = 0; i < bytes.length; i++) {
			if (bytes[i] == (byte) 0xff && i + 2 < bytes.length) {
				switch (bytes[i + 1]) {
				case (byte) 0xfb:
					options.append(" WILL ");
					break;
				case (byte) 0xfc:
					options.append(" WON'T ");
					break;
				case (byte) 0xfd:
					options.append(" DO ");
					break;
				case (byte) 0xfe:
					options.append(" DON'T ");
					break;
				default:
					options.append(" unkown command ");
					break;
				}
				// option name
				switch (bytes[i + 2]) {
				case 0x00:
					options.append("Binary Transmission\n");
					break;
				case 0x01:
					options.append("Echo\n");
					break;
				case 0x02:
					options.append("Reconnection\n");
					break;
				case 0x03:
					options.append("Suppress Go Ahead\n");
					break;
				case 0x04:
					options.append("Approx Message Size Negotiation\n");
					break;
				case 0x05:
					options.append("Status\n");
					break;
				case 0x06:
					options.append("Timing Mark\n");
					break;
				case 0x07:
					options.append("Remote Controlled Trans and Echo\n");
					break;
				case 0x08:
					options.append("Output Line Width\n");
					break;
				case 0x09:
					options.append("Output Page Size\n");
					break;
				case 0x0a:
					options.append("Output Carriage-Return Disposition\n");
					break;
				case 0x0b:
					options.append("Output Horizontal Tab Stops\n");
					break;
				case 0x0c:
					options.append("Output Horizontal Tab Disposition\n");
					break;
				case 0x0d:
					options.append("Output Formfeed Disposition\n");
					break;
				case 0x0e:
					options.append("Output Vertical Tabstops\n");
					break;
				case 0x0f:
					options.append("Output Vertical Tab Disposition\n");
					break;
				case 0x10:
					options.append("Output Linefeed Disposition\n");
					break;
				case 0x11:
					options.append("Extended ASCII\n");
					break;
				case 0x12:
					options.append("Logout\n");
					break;
				case 0x13:
					options.append("Byte Macro\n");
					break;
				case 0x14:
					options.append("Data Entry Terminal\n");
					break;
				case 0x15:
					options.append("SUPDUP\n");
					break;
				case 0x16:
					options.append("SUPDUP Output\n");
					break;
				case 0x17:
					options.append("Send Location\n");
					break;
				case 0x18:
					options.append("Terminal Type\n");
					break;
				case 0x19:
					options.append("End of Record\n");
					break;
				case 0x1a:
					options.append("TACACS User Identification\n");
					break;
				case 0x1b:
					options.append("Output Marking\n");
					break;
				case 0x1c:
					options.append("Terminal Location Number\n");
					break;
				case 0x1d:
					options.append("Telnet 3270 Regime\n");
					break;
				case 0x1e:
					options.append("X.3 PAD\n");
					break;
				case 0x1f:
					options.append("Negotiate About Window Size\n");
					break;
				case 0x20:
					options.append("Terminal Speed\n");
					break;
				case 0x21:
					options.append("Remote Flow Control\n");
					break;
				case 0x22:
					options.append("Linemode\n");
					break;
				case 0x23:
					options.append("X Display Location\n");
					break;
				case (byte) 0xff:
					options.append("Extended-Options-List\n");
					break;
				default:
					options.append("unknown option\n");
					break;
				}
			}
		}
		return options.toString();
	}

}