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109 lines
2.5 KiB
C++
109 lines
2.5 KiB
C++
9 years ago
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#ifndef QDECPACKED_HH
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#define QDECPACKED_HH
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/** \file QDecPacked.hh
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* Declarations for the class QDecPacked.
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*
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* (C) Copyright by Semih Cemiloglu
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* All rights reserved, see COPYRIGHT file for details.
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*
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* $Id$
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*
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*
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*/
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#include <QByteArray>
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#include "QDecFwd.hh"
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extern "C" {
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#include "decPacked.h"
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}
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/*!
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\class QDecPacked
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QDecPacked augments decPacked by encapsulating reference counted byte
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array and scale of the decimal point as members variables, thus, freeing up
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user of this class from memory management and keeping track of scale value.
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The decPacked format is the classic packed decimal format implemented
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by IBM S/360 and later machines, where each digit is encoded as
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a 4-bit binary sequence (BCD) and a number is ended by a 4-bit
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sign indicator. The decPacked module accepts variable lengths,
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allowing for very large numbers (up to a billion digits), and also
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allows the specification of a scale.
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*/
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class QDECIMAL_EXPORT QDecPacked
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{
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// MEMBERS
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//! Byte array containing BCD sequence
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QByteArray m_bytes;
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//! Scale of the decimal number (point)
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int32_t m_scale;
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public:
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// CREATORS
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//! Default constructor
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QDecPacked() : m_scale(0) {}
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QDecPacked(int32_t length, int32_t scale = 0)
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: m_bytes(length,'\0'), m_scale(scale) {}
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QDecPacked(const QByteArray& bytes, int32_t scale = 0)
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: m_bytes(bytes), m_scale(scale) {}
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// Default copy constructor and destructor are ok to use
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// Conversion constructors using simple types
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QDecPacked(const char* str);
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QDecPacked(double d);
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// Conversion constructors using composite types
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QDecPacked(const QDecNumber& d) { fromQDecNumber(d); }
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QDecPacked(const QDecSingle& s);
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QDecPacked(const QDecDouble& d);
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QDecPacked(const QDecQuad& d);
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// ACCESSORS
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const char* data() const
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{ return m_bytes.data(); }
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QByteArray bytes() const
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{ return m_bytes; }
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const uint8_t* bytesRaw() const
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{ return reinterpret_cast<const uint8_t*>(m_bytes.data()); }
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int32_t length() const
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{ return m_bytes.size(); }
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int32_t scale() const
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{ return m_scale; }
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QByteArray toString() const;
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// MODIFIERS
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uint8_t* bytesRaw()
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{ return reinterpret_cast<uint8_t*>(m_bytes.data()); }
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QDecPacked& fromDouble(double d);
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QDecPacked& fromString(const char* str);
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void setLength(int32_t length)
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{ m_bytes.resize(length); }
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void setScale(int32_t scale)
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{ m_scale = scale; }
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// CONVERSIONS
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QDecNumber toQDecNumber() const;
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QDecPacked& fromQDecNumber(const QDecNumber& d);
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}; // end class
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#endif /* Include guard */
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