VOID
MouseClassServiceCallback(
IN PDEVICE_OBJECT DeviceObject,
IN PMOUSE_INPUT_DATA InputDataStart,
IN PMOUSE_INPUT_DATA InputDataEnd,
IN OUT PULONG InputDataConsumed
)
{
deviceExtension->DataIn = (PMOUSE_INPUT_DATA)
(((PCHAR) deviceExtension->DataIn) + moveSize);
if ((PCHAR) deviceExtension->DataIn >=
((PCHAR) deviceExtension->InputData +
deviceExtension->MouseAttributes.InputDataQueueLength)) {
deviceExtension->DataIn = deviceExtension->InputData;//满了则从头开始，设置为头
}
if ((bytesToMove - moveSize) > 0) {
//
// Special case. The data must wrap in the class input data buffer.
// Copy the rest of the port input data into the beginning of the
// class input data queue.
//
//
// moveSize <- Number of bytes to handle in the second move.
//
moveSize = bytesToMove - moveSize;
//
// Do the move from the port data queue to the class data queue.
//
MouPrint((
3,
"MOUCLASS-MouseClassServiceCallback: number of bytes in second move to class 0x%lx\n",
moveSize
));
MouPrint((
3,
"MOUCLASS-MouseClassServiceCallback: move bytes from 0x%lx to 0x%lx\n",
(PCHAR) InputDataStart,
(PCHAR) deviceExtension->DataIn
));
RtlMoveMemory(
(PCHAR) deviceExtension->DataIn,
(PCHAR) InputDataStart,
moveSize
);从头把剩下的应该拷贝的第二次拷贝完。
//
// Update the class input data queue insertion pointer.
//
deviceExtension->DataIn = (PMOUSE_INPUT_DATA)
(((PCHAR) deviceExtension->DataIn) + moveSize);
}