| [1050] | 1 | #ifndef QUACHECKSUM32_H
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| 2 | #define QUACHECKSUM32_H
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| 3 |
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| 4 | /*
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| 5 | Copyright (C) 2005-2014 Sergey A. Tachenov
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| 6 |
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| 7 | This file is part of QuaZIP.
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| 8 |
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| 9 | QuaZIP is free software: you can redistribute it and/or modify
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| 10 | it under the terms of the GNU Lesser General Public License as published by
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| 11 | the Free Software Foundation, either version 2.1 of the License, or
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| 12 | (at your option) any later version.
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| 13 |
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| 14 | QuaZIP is distributed in the hope that it will be useful,
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| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 17 | GNU Lesser General Public License for more details.
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| 18 |
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| 19 | You should have received a copy of the GNU Lesser General Public License
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| 20 | along with QuaZIP. If not, see <http://www.gnu.org/licenses/>.
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| 21 |
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| 22 | See COPYING file for the full LGPL text.
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| 23 |
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| 24 | Original ZIP package is copyrighted by Gilles Vollant and contributors,
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| 25 | see quazip/(un)zip.h files for details. Basically it's the zlib license.
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| 26 | */
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| 27 |
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| 28 | #include <QByteArray>
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| 29 | #include "quazip_global.h"
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| 30 |
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| 31 | /// Checksum interface.
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| 32 | /** \class QuaChecksum32 quachecksum32.h <quazip/quachecksum32.h>
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| 33 | * This is an interface for 32 bit checksums.
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| 34 | * Classes implementing this interface can calcunate a certin
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| 35 | * checksum in a single step:
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| 36 | * \code
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| 37 | * QChecksum32 *crc32 = new QuaCrc32();
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| 38 | * rasoult = crc32->calculate(data);
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| 39 | * \endcode
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| 40 | * or by streaming the data:
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| 41 | * \code
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| 42 | * QChecksum32 *crc32 = new QuaCrc32();
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| 43 | * while(!fileA.atEnd())
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| 44 | * crc32->update(fileA.read(bufSize));
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| 45 | * resoultA = crc32->value();
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| 46 | * crc32->reset();
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| 47 | * while(!fileB.atEnd())
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| 48 | * crc32->update(fileB.read(bufSize));
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| 49 | * resoultB = crc32->value();
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| 50 | * \endcode
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| 51 | */
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| 52 | class QUAZIP_EXPORT QuaChecksum32
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| 53 | {
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| 54 |
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| 55 | public:
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| 56 | ///Calculates the checksum for data.
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| 57 | /** \a data source data
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| 58 | * \return data checksum
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| 59 | *
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| 60 | * This function has no efect on the value returned by value().
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| 61 | */
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| 62 | virtual quint32 calculate(const QByteArray &data) = 0;
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| 63 |
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| 64 | ///Resets the calculation on a checksun for a stream.
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| 65 | virtual void reset() = 0;
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| 66 |
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| 67 | ///Updates the calculated checksum for the stream
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| 68 | /** \a buf next portion of data from the stream
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| 69 | */
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| 70 | virtual void update(const QByteArray &buf) = 0;
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| 71 |
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| 72 | ///Value of the checksum calculated for the stream passed throw update().
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| 73 | /** \return checksum
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| 74 | */
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| 75 | virtual quint32 value() = 0;
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| 76 | };
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| 77 |
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| 78 | #endif //QUACHECKSUM32_H
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