unzip_p.h

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/****************************************************************************
** Filename: unzip_p.h
** Last updated [dd/mm/yyyy]: 28/01/2007
**
** pkzip 2.0 decompression.
**
** Some of the code has been inspired by other open source projects,
** (mainly Info-Zip and Gilles Vollant's minizip).
** Compression and decompression actually uses the zlib library.
**
** Copyright (C) 2007-2008 Angius Fabrizio. All rights reserved.
**
** This file is part of the OSDaB project (http://osdab.sourceforge.net/).
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See the file LICENSE.GPL that came with this software distribution or
** visit http://www.gnu.org/copyleft/gpl.html for GPL licensing information.
**
**********************************************************************/
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Zip/UnZip API.  It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#ifndef OSDAB_UNZIP_P_H
#define OSDAB_UNZIP_P_H
 
#include "unzip.h"
#include "zipentry_p.h"
 
#include <QtGlobal>
 
using keyset = std::array<quint32,3>;
 
// zLib authors suggest using larger buffers (128K or 256K) for (de)compression (especially for inflate())
// we use a 256K buffer here - if you want to use this code on a pre-iceage mainframe please change it ;)
#define UNZIP_READ_BUFFER (256*1024)
 
class UnzipPrivate
{
public:
        UnzipPrivate();
 
        // Replace this with whatever else you use to store/retrieve the password.
        QString password;
 
        bool skipAllEncrypted {false};
 
        QMap<QString,ZipEntryP*>* headers {nullptr};
 
        QIODevice* device {nullptr};
 
        char buffer1[UNZIP_READ_BUFFER] {0};
        char buffer2[UNZIP_READ_BUFFER] {0};
 
        unsigned char* uBuffer;
        const quint32* crcTable;
 
        // Central Directory (CD) offset
        quint32 cdOffset {0};
        // End of Central Directory (EOCD) offset
        quint32 eocdOffset {0};
 
        // Number of entries in the Central Directory (as to the EOCD record)
        quint16 cdEntryCount {0};
 
        // The number of detected entries that have been skipped because of a non compatible format
        quint16 unsupportedEntryCount {0};
 
        QString comment;
 
        UnZip::ErrorCode openArchive(QIODevice* device);
 
        UnZip::ErrorCode seekToCentralDirectory();
        UnZip::ErrorCode parseCentralDirectoryRecord();
        UnZip::ErrorCode parseLocalHeaderRecord(const QString& path, ZipEntryP& entry);
 
        void closeArchive();
 
        UnZip::ErrorCode extractFile(const QString& path, ZipEntryP& entry, const QDir& dir, UnZip::ExtractionOptions options);
        UnZip::ErrorCode extractFile(const QString& path, ZipEntryP& entry, QIODevice* device, UnZip::ExtractionOptions options);
 
        UnZip::ErrorCode testPassword(keyset keys, const QString& file, const ZipEntryP& header);
        bool testKeys(const ZipEntryP& header, keyset keys);
 
        bool createDirectory(const QString& path);
 
        inline void decryptBytes(keyset keys, char* buffer, qint64 read) const;
 
        static inline quint32 getULong(const unsigned char* data, quint32 offset) ;
        static inline quint64 getULLong(const unsigned char* data, quint32 offset) ;
        static inline quint16 getUShort(const unsigned char* data, quint32 offset) ;
        static inline int decryptByte(quint32 key2) ;
        inline void updateKeys(keyset keys, int c) const;
        inline void initKeys(const QString& pwd, keyset keys) const;
 
        static inline QDateTime convertDateTime(const std::array<uint8_t,2> &date, const std::array<uint8_t,2> &time) ;
};
 
#endif // OSDAB_UNZIP_P_H