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| -rw-r--r-- | include/tools/bigint.hxx | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/include/tools/bigint.hxx b/include/tools/bigint.hxx new file mode 100644 index 0000000000..f8f57fc45d --- /dev/null +++ b/include/tools/bigint.hxx @@ -0,0 +1,255 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ +#ifndef INCLUDED_TOOLS_BIGINT_HXX +#define INCLUDED_TOOLS_BIGINT_HXX + +#include <tools/toolsdllapi.h> +#include <tools/long.hxx> + +#include <cassert> +#include <string_view> + +#define MAX_DIGITS 8 + +class SAL_WARN_UNUSED TOOLS_DLLPUBLIC BigInt +{ +private: + // we only use one of these two fields at a time + union { + sal_Int32 nVal; + sal_uInt16 nNum[MAX_DIGITS]; + }; + sal_uInt8 nLen : 5; // current length, if 0, data is in nVal, otherwise data is in nNum + bool bIsNeg : 1; // Is Sign negative? + + TOOLS_DLLPRIVATE void MakeBigInt(BigInt const &); + TOOLS_DLLPRIVATE void Normalize(); + TOOLS_DLLPRIVATE void Mult(BigInt const &, sal_uInt16); + TOOLS_DLLPRIVATE void Div(sal_uInt16, sal_uInt16 &); + TOOLS_DLLPRIVATE bool IsLess(BigInt const &) const; + TOOLS_DLLPRIVATE void AddLong(BigInt &, BigInt &); + TOOLS_DLLPRIVATE void SubLong(BigInt &, BigInt &); + TOOLS_DLLPRIVATE void MultLong(BigInt const &, BigInt &) const; + TOOLS_DLLPRIVATE void DivLong(BigInt const &, BigInt &) const; + TOOLS_DLLPRIVATE void ModLong(BigInt const &, BigInt &) const; + TOOLS_DLLPRIVATE bool ABS_IsLess(BigInt const &) const; + +public: + BigInt() + : nVal(0) + , nLen(0) + , bIsNeg(false) + { + } + + BigInt(sal_Int32 nValue) + : nVal(nValue) + , nLen(0) + , bIsNeg(false) + { + } + +#if SAL_TYPES_SIZEOFLONG == 4 + BigInt(int nValue) + : nVal(nValue) + , nLen(0) + , bIsNeg(false) + { + } +#endif + + BigInt( double nVal ); + BigInt( sal_uInt32 nVal ); + BigInt( sal_Int64 nVal ); + BigInt( const BigInt& rBigInt ); + BigInt( std::u16string_view rString ); + + operator sal_Int16() const; + operator sal_uInt16() const; + operator sal_Int32() const; + operator sal_uInt32() const; + operator double() const; +#if SAL_TYPES_SIZEOFPOINTER == 8 + operator tools::Long() const; +#endif + + bool IsNeg() const; + bool IsZero() const; + bool IsLong() const { return nLen == 0; } + + void Abs(); + + BigInt& operator =( const BigInt& rVal ); + BigInt& operator +=( const BigInt& rVal ); + BigInt& operator -=( const BigInt& rVal ); + BigInt& operator *=( const BigInt& rVal ); + BigInt& operator /=( const BigInt& rVal ); + BigInt& operator %=( const BigInt& rVal ); + + BigInt& operator =( sal_Int32 nValue ); + + /* Scale and round value */ + static tools::Long Scale(tools::Long nVal, tools::Long nMult, tools::Long nDiv); + + friend inline BigInt operator +( const BigInt& rVal1, const BigInt& rVal2 ); + friend inline BigInt operator -( const BigInt& rVal1, const BigInt& rVal2 ); + friend inline BigInt operator *( const BigInt& rVal1, const BigInt& rVal2 ); + friend inline BigInt operator /( const BigInt& rVal1, const BigInt& rVal2 ); + friend inline BigInt operator %( const BigInt& rVal1, const BigInt& rVal2 ); + + TOOLS_DLLPUBLIC friend bool operator==( const BigInt& rVal1, const BigInt& rVal2 ); + friend inline bool operator!=( const BigInt& rVal1, const BigInt& rVal2 ); + TOOLS_DLLPUBLIC friend bool operator< ( const BigInt& rVal1, const BigInt& rVal2 ); + friend inline bool operator> ( const BigInt& rVal1, const BigInt& rVal2 ); + friend inline bool operator<=( const BigInt& rVal1, const BigInt& rVal2 ); + friend inline bool operator>=( const BigInt& rVal1, const BigInt& rVal2 ); + + friend class Fraction; +}; + +inline BigInt::operator sal_Int16() const +{ + if ( nLen == 0 && nVal >= SAL_MIN_INT16 && nVal <= SAL_MAX_INT16 ) + return static_cast<sal_Int16>(nVal); + assert(false && "out of range"); + return 0; +} + +inline BigInt::operator sal_uInt16() const +{ + if ( nLen == 0 && nVal >= 0 && nVal <= SAL_MAX_UINT16 ) + return static_cast<sal_uInt16>(nVal); + assert(false && "out of range"); + return 0; +} + +inline BigInt::operator sal_Int32() const +{ + if (nLen == 0) + return nVal; + assert(false && "out of range"); + return 0; +} + +inline BigInt::operator sal_uInt32() const +{ + if ( nLen == 0 && nVal >= 0 ) + return static_cast<sal_uInt32>(nVal); + assert(false && "out of range"); + return 0; +} + +#if SAL_TYPES_SIZEOFPOINTER == 8 +inline BigInt::operator tools::Long() const +{ + // Clamp to int32 since long is int32 on Windows. + if (nLen == 0) + return nVal; + assert(false && "out of range"); + return 0; +} +#endif + +inline BigInt& BigInt::operator =( sal_Int32 nValue ) +{ + nLen = 0; + nVal = nValue; + + return *this; +} + +inline bool BigInt::IsNeg() const +{ + if ( nLen == 0 ) + return (nVal < 0); + else + return bIsNeg; +} + +inline bool BigInt::IsZero() const +{ + if ( nLen != 0 ) + return false; + else + return (nVal == 0); +} + +inline void BigInt::Abs() +{ + if ( nLen != 0 ) + bIsNeg = false; + else if ( nVal < 0 ) + nVal = -nVal; +} + +inline BigInt operator+( const BigInt &rVal1, const BigInt &rVal2 ) +{ + BigInt aErg( rVal1 ); + aErg += rVal2; + return aErg; +} + +inline BigInt operator-( const BigInt &rVal1, const BigInt &rVal2 ) +{ + BigInt aErg( rVal1 ); + aErg -= rVal2; + return aErg; +} + +inline BigInt operator*( const BigInt &rVal1, const BigInt &rVal2 ) +{ + BigInt aErg( rVal1 ); + aErg *= rVal2; + return aErg; +} + +inline BigInt operator/( const BigInt &rVal1, const BigInt &rVal2 ) +{ + BigInt aErg( rVal1 ); + aErg /= rVal2; + return aErg; +} + +inline BigInt operator%( const BigInt &rVal1, const BigInt &rVal2 ) +{ + BigInt aErg( rVal1 ); + aErg %= rVal2; + return aErg; +} + +inline bool operator!=( const BigInt& rVal1, const BigInt& rVal2 ) +{ + return !(rVal1 == rVal2); +} + +inline bool operator>(const BigInt& rVal1, const BigInt& rVal2) { return rVal2 < rVal1; } + +inline bool operator<=( const BigInt& rVal1, const BigInt& rVal2 ) +{ + return !( rVal1 > rVal2); +} + +inline bool operator>=( const BigInt& rVal1, const BigInt& rVal2 ) +{ + return !(rVal1 < rVal2); +} + +#endif + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |