77 lines
2 KiB
C++
77 lines
2 KiB
C++
#ifndef CHUNKS_H
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#define CHUNKS_H
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/** \cond docNever */
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/*! The Chunks class is the storage backend for QHexEdit.
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*
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* When QHexEdit loads data, Chunks access them using a QIODevice interface. When the app uses
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* a QByteArray interface, QBuffer is used to provide again a QIODevice like interface. No data
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* will be changed, therefore Chunks opens the QIODevice in QIODevice::ReadOnly mode. After every
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* access Chunks closes the QIODevice, that's why external applications can overwrite files while
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* QHexEdit shows them.
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*
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* When the the user starts to edit the data, Chunks creates a local copy of a chunk of data (4
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* kilobytes) and notes all changes there. Parallel to that chunk, there is a second chunk,
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* which keep track of which bytes are changed and which not.
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*
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*/
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#include <QtCore>
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struct Chunk
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{
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QByteArray data;
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QByteArray dataChanged;
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qint64 absPos;
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};
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class Chunks: public QObject
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{
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Q_OBJECT
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public:
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// Constructors and file settings
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Chunks(QObject *parent);
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Chunks(QIODevice &ioDevice, QObject *parent);
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bool setIODevice(QIODevice &ioDevice);
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// Getting data out of Chunks
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QByteArray data(qint64 pos=0, qint64 count=-1, QByteArray *highlighted=0);
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bool write(QIODevice &iODevice, qint64 pos=0, qint64 count=-1);
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// Set and get highlighting infos
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void setDataChanged(qint64 pos, bool dataChanged);
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bool dataChanged(qint64 pos);
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// Search API
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qint64 indexOf(const QByteArray &ba, qint64 from);
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qint64 lastIndexOf(const QByteArray &ba, qint64 from);
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// Char manipulations
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bool insert(qint64 pos, char b);
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bool overwrite(qint64 pos, char b);
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bool removeAt(qint64 pos);
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// Utility functions
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char operator[](qint64 pos);
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qint64 pos();
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qint64 size();
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private:
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int getChunkIndex(qint64 absPos);
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QIODevice * _ioDevice;
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qint64 _pos;
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qint64 _size;
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QList<Chunk> _chunks;
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#ifdef MODUL_TEST
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public:
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int chunkSize();
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#endif
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};
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/** \endcond docNever */
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#endif // CHUNKS_H
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