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#ifndef QUACHECKSUM32_H
#define QUACHECKSUM32_H
#include <QtCore/QByteArray>
#include "quazip_global.h"
/// Checksum interface.
/** \class QuaChecksum32 quachecksum32.h <quazip/quachecksum32.h>
* This is an interface for 32 bit checksums.
* Classes implementing this interface can calcunate a certin
* checksum in a single step:
* \code
* QChecksum32 *crc32 = new QuaCrc32();
* rasoult = crc32->calculate(data);
* \endcode
* or by streaming the data:
* \code
* QChecksum32 *crc32 = new QuaCrc32();
* while(!fileA.atEnd())
* crc32->update(fileA.read(bufSize));
* resoultA = crc32->value();
* crc32->reset();
* while(!fileB.atEnd())
* crc32->update(fileB.read(bufSize));
* resoultB = crc32->value();
* \endcode
*/
class QUAZIP_EXPORT QuaChecksum32
{
public:
///Calculates the checksum for data.
/** \a data source data
* \return data checksum
*
* This function has no efect on the value returned by value().
*/
virtual quint32 calculate(const QByteArray &data) = 0;
///Resets the calculation on a checksun for a stream.
virtual void reset() = 0;
///Updates the calculated checksum for the stream
/** \a buf next portion of data from the stream
*/
virtual void update(const QByteArray &buf) = 0;
///Value of the checksum calculated for the stream passed throw update().
/** \return checksum
*/
virtual quint32 value() = 0;
};
#endif //QUACHECKSUM32_H
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