wacom_device_header
static ssize_t kHeaderSize = sizeof(wacom_device_header);
wacom_device_header device_header;
wacom_device_header device_header;
memcpy(buffer, &device_header, sizeof(wacom_device_header));
return user_memcpy(buffer, &device_header, sizeof(wacom_device_header));
if (*count > sizeof(wacom_device_header)) {
*count = sizeof(wacom_device_header);
*count - sizeof(wacom_device_header));
*count = dataLength + sizeof(wacom_device_header);
buffer + sizeof(wacom_device_header),
memcpy(buffer + sizeof(wacom_device_header),
} else if (*count == sizeof(wacom_device_header)) {