001/**
002 *
003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
004 *
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either 
008 * version 2.1 of the License, or (at your option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013 * Lesser General Public License for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public 
016 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
017 * 
018 **/
019/**
020 * Implements the CFML Function bitmaskset
021 */
022package lucee.runtime.functions.math;
023
024import lucee.runtime.PageContext;
025import lucee.runtime.exp.FunctionException;
026import lucee.runtime.ext.function.Function;
027
028public final class BitMaskSet implements Function {
029        
030        public static double call(PageContext pc , double dnumber, double dmask, double dstart, double dlength) throws FunctionException {
031
032                int number=(int)dnumber, mask=(int)dmask, start=(int)dstart, length=(int)dlength;
033                
034                if(start > 31 || start < 0)
035                        throw new FunctionException(pc,"bitMaskSet",2,"start","must be beetween 0 and 31 now "+start);
036                if(length > 31 || length < 0)
037                        throw new FunctionException(pc,"bitMaskSet",3,"length","must be beetween 0 and 31 now "+length);
038                
039        int tmp = (1 << length) - 1 << start;
040        mask &= (1 << length) - 1;
041        return number & ~tmp | mask << start;
042        }
043}