byte_view_text_cells.h

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#ifndef BYTE_VIEW_TEXT_CELLS_H
#define BYTE_VIEW_TEXT_CELLS_H
 
#include <config.h>
 
#include <QByteArray>
#include <QString>
#include <QVector>

class ByteViewTextCells
{
public:
    enum Encoding {
        Ascii,  
        Ebcdic, 
        Utf8    
    };

    enum CellKind {
        Printable,    
        NonPrintable, 
        Invalid       
    };

    struct Cell {
        int start;     
        int length;    
        CellKind kind; 
        QString text;  
    };

    static const int max_cell_bytes = 32;
 
    ByteViewTextCells();

    void decode(const QByteArray &data, Encoding encoding);

    void clear();

    int cellCount() const;

    Cell cellAt(int cell_index) const;

    int cellIndexForByte(int offset) const;

    bool cellForByte(int offset, Cell &cell) const;
 
private:
    struct StoredCell {
        int start;         
        int text_pos;      
        uint16_t length;   
        uint16_t text_len; 
        uint8_t kind;      
    };

    struct CodePoint {
        int start;   
        int length;  
        uint32_t uc; 
    };
 
    Cell singleByteCell(int offset) const;
 
    void decodeUtf8();

    void appendRun(const QVector<CodePoint> &run);

    void appendCluster(const QVector<CodePoint> &run, int first, int last);

    void appendCodePoints(const QVector<CodePoint> &run, int first, int last);
 
    void appendCell(int start, int length, CellKind kind, const QString &text);
    void appendDotCell(int start, int length, CellKind kind);
 
    static bool isDisplayable(uint32_t uc);
    static bool isMark(uint32_t uc);
    static QString textFor(const QVector<CodePoint> &run, int first, int last);
 
    QByteArray data_;           
    Encoding encoding_;         
    QVector<StoredCell> cells_; 
    QString text_;              
};
 
#endif // BYTE_VIEW_TEXT_CELLS_H