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