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XMLBigInteger.hpp

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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 1.8 2003/05/16 06:01:53 knoaman Exp $
00059  */
00060 
00061 #ifndef XML_BIGINTEGER_HPP
00062 #define XML_BIGINTEGER_HPP
00063 
00064 #include <xercesc/util/XMemory.hpp>
00065 #include <xercesc/util/XMLString.hpp>
00066 
00067 XERCES_CPP_NAMESPACE_BEGIN
00068 
00069 class  XMLBigInteger : public XMemory
00070 {
00071 public:
00072 
00084     XMLBigInteger
00085     (
00086         const XMLCh* const strValue
00087         , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
00088     );
00089     ~XMLBigInteger();
00090 
00091     XMLBigInteger(const XMLBigInteger& toCopy);
00092 
00093     static void parseBigInteger(const XMLCh* const toConvert
00094                               , XMLCh* const       retBuffer
00095                               , int&   signValue);
00096 
00097     static int  compareValues(const XMLBigInteger* const lValue
00098                              ,const XMLBigInteger* const rValue);
00099 
00100 
00101     void        multiply(const unsigned int byteToShift);
00102 
00103     void        divide(const unsigned int byteToShift);
00104 
00105     int         getTotalDigit() const;
00106 
00115     inline XMLCh*      toString() const;
00116     
00122     inline XMLCh*      getRawData() const;
00123 
00134     bool operator==(const XMLBigInteger& toCompare) const;
00135 
00140     int getSign() const;
00141 
00142     int intValue() const;
00143 
00144 private:
00145 
00146     void setSign(int);
00147 
00148     /*
00149      * The number is internally stored in "minimal" sign-fMagnitude format
00150      * (i.e., no BigIntegers have a leading zero byte in their magnitudes).
00151      * Zero is represented with a signum of 0 (and a zero-length fMagnitude).
00152      * Thus, there is exactly one representation for each value.
00153      */
00154     // -----------------------------------------------------------------------
00155     //  Private data members
00156     //
00157     //  fSign
00158     //     to represent the sign of the number.
00159     //
00160     //  fMagnitude
00161     //     the buffer holding the number.
00162     //
00163     //  fRawData
00164     //     to preserve the original string used to construct this object,
00165     //     needed for pattern matching.
00166     //
00167     // -----------------------------------------------------------------------
00168 
00169     int         fSign;
00170     XMLCh*      fMagnitude;  //null terminated
00171     XMLCh*      fRawData;
00172     MemoryManager* fMemoryManager;
00173 };
00174 
00175 inline int XMLBigInteger::getSign() const
00176 {    
00177     return fSign;
00178 }
00179 
00180 inline int XMLBigInteger::getTotalDigit() const
00181 {
00182     return ((getSign() ==0) ? 0 : XMLString::stringLen(fMagnitude));
00183 }
00184 
00185 inline bool XMLBigInteger::operator==(const XMLBigInteger& toCompare) const
00186 {
00187     return ( compareValues(this, &toCompare) ==0 ? true : false);
00188 }
00189 
00190 inline void XMLBigInteger::setSign(int newSign)
00191 {
00192     fSign = newSign;
00193 }
00194 
00195 inline XMLCh*  XMLBigInteger::getRawData() const
00196 {
00197     return fRawData;
00198 }
00199 
00200 //
00201 // The caller needs to de-allocate the memory allocated by this function
00202 //
00203 inline XMLCh*  XMLBigInteger::toString() const
00204 {
00205     // Return data using global operator new
00206     return XMLString::replicate(fRawData);
00207 }
00208 
00209 XERCES_CPP_NAMESPACE_END
00210 
00211 #endif


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