CCrcCalculator.h

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/********************************************************************************
**  This file is part of the ICF Framework. Copyright (C) Witold Gantzke & Kirill Lepskiy
**  ICF Framework may be used under the terms of the LGPL License v. 2.1 by the Free Software Foundation.
********************************************************************************/
 
#pragma once
 
 
// Qt includes
#include <QtCore/QVector>
#include <QtCore/QString>
 
 
namespace istd
{
 
 
class CCrcCalculator
{
public:
    typedef QVector<quint8> ByteStream;
 
    static quint32 GetCrcFromData(const quint8* dataPtr, int dataSize);
 
    static quint32 GetCrcFromStream(const ByteStream& byteStream);
 
    static quint32 GetCrcFromFile(const QString& fileName);
 
protected:
    static void UpdateCrc(const quint8& byte, quint32& dwCrc32);
 
private:
    static quint32 s_crcTable[256];
};
 
 
// protected inline methods
 
inline void CCrcCalculator::UpdateCrc(const quint8& byte, quint32& crcValue)
{
    crcValue = (crcValue >> 8) ^ s_crcTable[byte ^ (crcValue & 0x000000FF)];
}
 
 
} // namespace istd