STDMETHODIMP GuestFile::ReadAt(LONG64 aOffset, ULONG aToRead, ULONG aTimeoutMS, ComSafeArrayOut(BYTE, aData))
{
#ifndef VBOX_WITH_GUEST_CONTROL
ReturnComNotImplemented();
#else
if (aToRead == 0)
return setError(E_INVALIDARG, tr("The size to read is zero"));
CheckComArgOutSafeArrayPointerValid(aData);
AutoCaller autoCaller(this);
if (FAILED(autoCaller.rc())) return autoCaller.rc();
com::SafeArray<BYTE> data((size_t)aToRead);
Assert(data.size() >= aToRead);
HRESULT hr = S_OK;
size_t cbRead;
int vrc = readDataAt(aOffset, aToRead, aTimeoutMS,
data.raw(), aToRead, &cbRead);
if (RT_SUCCESS(vrc))
{
if (data.size() != cbRead)
data.resize(cbRead);
data.detachTo(ComSafeArrayOutArg(aData));
}
else
{
switch (vrc)
{
default:
hr = setError(VBOX_E_IPRT_ERROR,
tr("Reading from file \"%s\" (at offset %RU64) failed: %Rrc"),
mData.mOpenInfo.mFileName.c_str(), aOffset, vrc);
break;
}
}
LogFlowFuncLeaveRC(vrc);
return hr;
#endif /* VBOX_WITH_GUEST_CONTROL */
}
uint8_t* ByteData::readData(uint16_t len, uint16_t moveBy)
{
uint8_t* data = readDataAt(m_pos, len);
m_pos += (moveBy == 0) ? len : moveBy;
return data;
}