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 bitmaskread 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 BitMaskRead implements Function { 029 030 public static double call(PageContext pc , double dnumber, double dstart, double dlength) throws FunctionException { 031 032 int number=(int) dnumber,start=(int) dstart,length=(int) dlength; 033 034 if(start > 31 || start < 0) 035 throw new FunctionException(pc,"bitMaskRead",2,"start","must be beetween 0 and 31 now "+start); 036 if(length > 31 || length < 0) 037 throw new FunctionException(pc,"bitMaskRead",3,"length","must be beetween 0 and 31 now "+length); 038 039 040 return number >> start & (1 << length) - 1; 041 } 042}