hidparser: USB mouse problem on Virtualbox

My computer is ASUS i7 notebook pc, I test the newest trunk version on qemu and vbox, qemu seems to work well, but vbox, the mouse can't work. I find the reason is that ros can't get mouse position correct, on the file reactos\reactos\win32ss\user\ntuser\mouse.c, line 189/190 show me ptCursor.x/ptCursor.y is too big to fit the desktop size.

It seems reactos\reactos\lib\drivers\hidparser\api.c has a mistake, line 637/638,

Parser->Copy(&Data, &ReportDescriptor[ReportItem->ByteOffset +1], min(sizeof(ULONG), ReportDescriptorLength - (ReportItem->ByteOffset + 1)));
Data = ReportDescriptor[ReportItem->ByteOffset + 1];

the second line seems redundancy and mistake, I delete the second line, but it still not work.

Just for test, I change file reactos\reactos\win32ss\user\ntuser\mouse.c, line 183-204,

if (pmi->dwFlags & MOUSEEVENTF_MOVE)
{
/* Mouse has changes position */
if (!(pmi->dwFlags & MOUSEEVENTF_ABSOLUTE))

{ /* Relative move */ ptCursor.x += pmi->dx; ptCursor.y += pmi->dy; }

else if (pmi->dwFlags & MOUSEEVENTF_VIRTUALDESK)

{ /* Absolute move in virtual screen units */ ptCursor.x = pmi->dx * UserGetSystemMetrics(SM_CXVIRTUALSCREEN) >> 16; ptCursor.y = pmi->dy * UserGetSystemMetrics(SM_CYVIRTUALSCREEN) >> 16; }

else

{ /* Absolute move in primary monitor units */ ptCursor.x = pmi->dx * UserGetSystemMetrics(SM_CXSCREEN) >> 16; ptCursor.y = pmi->dy * UserGetSystemMetrics(SM_CYSCREEN) >> 16; }

}

to

ptCursor.x = pmi->dx * UserGetSystemMetrics(SM_CXVIRTUALSCREEN) >> 15;
ptCursor.y = pmi->dy * UserGetSystemMetrics(SM_CYVIRTUALSCREEN) >> 15;

this time the mouse pointer shows and goes correctly, the mouse position gets and shows right.