Info.java

/*
 * Copyright (C) 1997-2001 Id Software, Inc.
 * 
 * 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 2 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, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307, USA.
 *  
 */
/* Modifications
   Copyright 2003-2004 Bytonic Software
   Copyright 2010 Google Inc.
*/
package com.googlecode.gwtquake.shared.game;


import java.util.StringTokenizer;

import com.googlecode.gwtquake.shared.common.Com;
import com.googlecode.gwtquake.shared.common.Constants;

public class Info {

	/**
	 * Returns a value for a key from an info string. 
	 */
    public static String Info_ValueForKey(String s, String key) {

        StringTokenizer tk = new StringTokenizer(s, "\\");

        while (tk.hasMoreTokens()) {
            String key1 = tk.nextToken();

            if (!tk.hasMoreTokens()) {
                Com.Printf("MISSING VALUE\n");
                return s;
            }
            String value1 = tk.nextToken();

            if (key.equals(key1))
                return value1;
        }

        return "";
    }

    /**
     * Sets a value for a key in the user info string.
     */
    public static String Info_SetValueForKey(String s, String key, String value) {

        if (value == null || value.length() == 0)
            return s;

        if (key.indexOf('\\') != -1 || value.indexOf('\\') != -1) {
            Com.Printf("Can't use keys or values with a \\\n");
            return s;
        }

        if (key.indexOf(';') != -1) {
            Com.Printf("Can't use keys or values with a semicolon\n");
            return s;
        }

        if (key.indexOf('"') != -1 || value.indexOf('"') != -1) {
            Com.Printf("Can't use keys or values with a \"\n");
            return s;
        }

        if (key.length() > Constants.MAX_INFO_KEY - 1
                || value.length() > Constants.MAX_INFO_KEY - 1) {
            Com.Printf("Keys and values must be < 64 characters.\n");
            return s;
        }

        StringBuffer sb = new StringBuffer(Info_RemoveKey(s, key));

        if (sb.length() + 2 + key.length() + value.length() > Constants.MAX_INFO_STRING) {

            Com.Printf("Info string length exceeded\n");
            return s;
        }

        sb.append('\\').append(key).append('\\').append(value);

        return sb.toString();
    }

    /** 
     * Removes a key and value from an info string. 
     */
    public static String Info_RemoveKey(String s, String key) {

        StringBuffer sb = new StringBuffer(512);

        if (key.indexOf('\\') != -1) {
            Com.Printf("Can't use a key with a \\\n");
            return s;
        }

        StringTokenizer tk = new StringTokenizer(s, "\\");

        while (tk.hasMoreTokens()) {
            String key1 = tk.nextToken();

            if (!tk.hasMoreTokens()) {
                Com.Printf("MISSING VALUE\n");
                return s;
            }
            String value1 = tk.nextToken();

            if (!key.equals(key1))
                sb.append('\\').append(key1).append('\\').append(value1);
        }

        return sb.toString();

    }

    /**
     * Some characters are illegal in info strings because they can mess up the
     * server's parsing.
     */
    public static boolean Info_Validate(String s) {
        return !((s.indexOf('"') != -1) || (s.indexOf(';') != -1));
    }

    private static String fillspaces = "                     ";

    public static void Print(String s) {

        StringBuffer sb = new StringBuffer(512);
        StringTokenizer tk = new StringTokenizer(s, "\\");

        while (tk.hasMoreTokens()) {

            String key1 = tk.nextToken();

            if (!tk.hasMoreTokens()) {
                Com.Printf("MISSING VALUE\n");
                return;
            }

            String value1 = tk.nextToken();

            sb.append(key1);

            int len = key1.length();

            if (len < 20) {
                sb.append(fillspaces.substring(len));
            }
            sb.append('=').append(value1).append('\n');
        }
        Com.Printf(sb.toString());
    }
}