2.2.2.1 Orders Update (TS_UPDATE_ORDERS_PDU_DATA)

The TS_UPDATE_ORDERS_PDU_DATA structure contains primary, secondary, and alternate secondary drawing orders aligned on byte boundaries. This structure conforms to the layout of a Slow Path Graphics Update (see [MS-RDPBCGR] section 2.2.9.1.1.3.1) and is encapsulated within a Graphics Update PDU (see [MS-RDPBCGR] section 2.2.9.1.1.3.1.1).

0	1	2	3	4	5	6	7	8	9	1 0	1	2	3	4	5	6	7	8	9	2 0	1	2	3	4	5	6	7	8	9	3 0	1
shareDataHeader (18 bytes)
...
...
...																updateType
pad2OctetsA																numberOrders
pad2OctetsB																orderData (variable)
...

shareDataHeader (18 bytes): Share Data Header (see [MS-RDPBCGR], section 2.2.8.1.1.1.2) containing information about the packet. The type subfield of the pduType field of the Share Control Header (section 2.2.8.1.1.1.1) MUST be set to PDUTYPE_DATAPDU (7). The pduType2 field of the Share Data Header MUST be set to PDUTYPE2_UPDATE (2).

updateType (2 bytes): A 16-bit, unsigned integer. The field contains the graphics update type. This field MUST be set to UPDATETYPE_ORDERS (0x0000).

pad2OctetsA (2 bytes): A 16-bit, unsigned integer used as a padding field. Values in this field are arbitrary and MUST be ignored.

numberOrders (2 bytes): A 16-bit, unsigned integer. The number of Drawing Order (section 2.2.2.1.1) structures contained in the orderData field.

pad2OctetsB (2 bytes): A 16-bit, unsigned integer used as a padding field. Values in this field are arbitrary and MUST be ignored.

orderData (variable): A variable-sized array of Drawing Order (section 2.2.2.1.1) structures packed on byte boundaries. Each structure contains a primary, secondary, or alternate secondary drawing order. The controlFlags field of the Drawing Order identifies the type of drawing order.