XMLBigInteger.hpp Source File

00001 /*
00002  * The Apache Software License, Version 1.1
00003  *
00004  * Copyright (c) 2001 The Apache Software Foundation.  All rights
00005  * reserved.
00006  *
00007  * Redistribution and use in source and binary forms, with or without
00008  * modification, are permitted provided that the following conditions
00009  * are met:
00010  *
00011  * 1. Redistributions of source code must retain the above copyright
00012  *    notice, this list of conditions and the following disclaimer.
00013  *
00014  * 2. Redistributions in binary form must reproduce the above copyright
00015  *    notice, this list of conditions and the following disclaimer in
00016  *    the documentation and/or other materials provided with the
00017  *    distribution.
00018  *
00019  * 3. The end-user documentation included with the redistribution,
00020  *    if any, must include the following acknowledgment:
00021  *       "This product includes software developed by the
00022  *        Apache Software Foundation (http://www.apache.org/)."
00023  *    Alternately, this acknowledgment may appear in the software itself,
00024  *    if and wherever such third-party acknowledgments normally appear.
00025  *
00026  * 4. The names "Xerces" and "Apache Software Foundation" must
00027  *    not be used to endorse or promote products derived from this
00028  *    software without prior written permission. For written
00029  *    permission, please contact apache\@apache.org.
00030  *
00031  * 5. Products derived from this software may not be called "Apache",
00032  *    nor may "Apache" appear in their name, without prior written
00033  *    permission of the Apache Software Foundation.
00034  *
00035  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
00036  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00037  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00038  * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
00039  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00040  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00041  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
00042  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
00043  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00044  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
00045  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00046  * SUCH DAMAGE.
00047  * ====================================================================
00048  *
00049  * This software consists of voluntary contributions made by many
00050  * individuals on behalf of the Apache Software Foundation, and was
00051  * originally based on software copyright (c) 2001 International
00052  * Business Machines, Inc., http://www.ibm.com .  For more information
00053  * on the Apache Software Foundation, please see
00054  * <http://www.apache.org/>.
00055  */
00056 
00057 /*
00058  * $Id: XMLBigInteger.hpp,v 1.4 2001/05/18 20:17:58 tng Exp $
00059  */
00060 
00061 #ifndef XML_BIGINTEGER_HPP
00062 #define XML_BIGINTEGER_HPP
00063 
00064 #include <util/XercesDefs.hpp>
00065 #include <util/XMLString.hpp>
00066 
00067 class  XMLBigInteger
00068 {
00069 public:
00070 
00081 
00082     XMLBigInteger(const XMLCh* const strValue);
00083 
00084     ~XMLBigInteger();
00085 
00086     XMLBigInteger(const XMLBigInteger& toCopy);
00087 
00088     static void parseBigInteger(const XMLCh* const toConvert
00089                               , XMLCh* const       retBuffer
00090                               , int&   signValue);
00091 
00092     static int  compareValues(const XMLBigInteger* const lValue
00093                              ,const XMLBigInteger* const rValue);
00094 
00095 
00096     void        multiply(const unsigned int byteToShift);
00097 
00098     void        divide(const unsigned int byteToShift);
00099 
00100     int         getTotalDigit() const;
00101 
00107     XMLCh*      toString() const;
00108 
00119     bool operator==(const XMLBigInteger& toCompare) const;
00120 
00125     int getSign() const;
00126 
00127 private:
00128 
00129     void setSign(int);
00130 
00131     /*
00132      * The number is internally stored in "minimal" sign-fMagnitude format
00133      * (i.e., no BigIntegers have a leading zero byte in their magnitudes).
00134      * Zero is represented with a signum of 0 (and a zero-length fMagnitude).
00135      * Thus, there is exactly one representation for each value.
00136      */
00137     // -----------------------------------------------------------------------
00138     //  Private data members
00139     //
00140     //  fSign
00141     //     to represent the sign of the number.
00142     //
00143     //  fMagnitude
00144     //     the buffer holding the number.
00145     //
00146     // -----------------------------------------------------------------------
00147 
00148     int         fSign;
00149     XMLCh*      fMagnitude;  //null terminated
00150 
00151 };
00152 
00153 inline int XMLBigInteger::getSign() const
00154 {   
00155     return fSign;
00156 }
00157 
00158 inline int XMLBigInteger::getTotalDigit() const
00159 {
00160     return ((getSign() ==0) ? 0 : XMLString::stringLen(fMagnitude));
00161 }
00162 
00163 inline bool XMLBigInteger::operator==(const XMLBigInteger& toCompare) const
00164 {
00165     return ( compareValues(this, &toCompare) ==0 ? true : false);
00166 }
00167 
00168 inline void XMLBigInteger::setSign(int newSign)
00169 {
00170     fSign = newSign;
00171 }
00172 
00173 #endif