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#ifndef UNPACKER_H
#define UNPACKER_H
#include <QtEndian>
#include <QByteArray>
#include <QString>
#include <QUuid>
class Unpacker
{
public:
Unpacker(const QByteArray &data);
template <typename T>
T read();
QString readFixedString(int n);
QUuid readUuid();
void skip(int n);
bool bad() const;
private:
const uchar * p();
bool checkBad(int n = 0);
const QByteArray &_buf;
int _offset;
bool _bad;
};
inline Unpacker::Unpacker(const QByteArray &data)
: _buf(data), _offset(0), _bad(false)
{
}
template <typename T>
inline T Unpacker::read()
{
if (checkBad(sizeof(T))) return 0;
const uchar *u = p();
_offset += sizeof(T);
return qFromBigEndian<T>(u);
}
inline QString Unpacker::readFixedString(int n)
{
if (checkBad(n)) return QString();
const char *u = &_buf.constData()[_offset];
_offset += n;
return QString::fromUtf8(u, strnlen(u, n));
}
inline QUuid Unpacker::readUuid()
{
if (checkBad(16)) return QString();
_offset += 16;
return QUuid::fromRfc4122(_buf.mid(_offset - 16, 16));
}
inline void Unpacker::skip(int n)
{
_offset += n;
checkBad();
}
inline bool Unpacker::bad() const
{
return _bad;
}
inline const uchar * Unpacker::p()
{
return reinterpret_cast<const uchar *>(&_buf.constData()[_offset]);
}
inline bool Unpacker::checkBad(int n)
{
if (_offset + n > _buf.size()) {
_bad = true;
}
return _bad;
}
#endif // UNPACKER_H
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