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79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
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#ifndef QUACHECKSUM32_H
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#define QUACHECKSUM32_H
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/*
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Copyright (C) 2005-2014 Sergey A. Tachenov
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This file is part of QuaZIP.
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QuaZIP is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2.1 of the License, or
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(at your option) any later version.
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QuaZIP is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with QuaZIP. If not, see <http://www.gnu.org/licenses/>.
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See COPYING file for the full LGPL text.
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Original ZIP package is copyrighted by Gilles Vollant and contributors,
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see quazip/(un)zip.h files for details. Basically it's the zlib license.
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*/
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#include <QByteArray>
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#include "quazip_global.h"
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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 QUAZIP_EXPORT 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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