2.2.8.1.1.1.2 Share Data Header (TS_SHAREDATAHEADER)
The TS_SHAREDATAHEADER header is a T.128 header ([T128] section 8.3) that MUST be present in all Data PDUs. A definitive list of all Data PDUs is given in the description of the pduType2 field.
|
|
|
|
|
|
|
|
|
|
1 |
|
|
|
|
|
|
|
|
|
2 |
|
|
|
|
|
|
|
|
|
3 |
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
shareControlHeader |
|||||||||||||||||||||||||||||||
|
... |
shareID |
||||||||||||||||||||||||||||||
|
... |
pad1 |
streamID |
|||||||||||||||||||||||||||||
|
uncompressedLength |
pduType2 |
compressedType |
|||||||||||||||||||||||||||||
|
compressedLength |
|||||||||||||||||||||||||||||||
shareControlHeader (6 bytes): Share Control Header (section 2.2.8.1.1.1.1) containing information about the packet. The PDUVersion subfield of the pduType field of the Share Control Header MUST be set to TS_PROTOCOL_VERSION (0x1).
shareID (4 bytes): A 32-bit, unsigned integer. Share identifier for the packet (see [T128] section 8.4.2 for more information about share IDs).
pad1 (1 byte): An 8-bit, unsigned integer. Padding. Values in this field MUST be ignored.
streamID (1 byte): An 8-bit, unsigned integer. The stream identifier for the packet.
-
Value
Meaning
STREAM_UNDEFINED
0x00
Undefined stream priority. This value might be used in the Server Synchronize PDU (section 2.2.1.19) due to a server-side RDP bug. It MUST NOT be used in conjunction with any other PDUs.
STREAM_LOW
0x01
Low-priority stream.
STREAM_MED
0x02
Medium-priority stream.
STREAM_HI
0x04
High-priority stream.
uncompressedLength (2 bytes): A 16-bit, unsigned integer. The uncompressed length of the packet in bytes.
pduType2 (1 byte): An 8-bit, unsigned integer. The type of Data PDU.
-
Value
Meaning
PDUTYPE2_UPDATE
0x02
PDUTYPE2_CONTROL
0x14
PDUTYPE2_POINTER
0x1B
PDUTYPE2_INPUT
0x1C
PDUTYPE2_SYNCHRONIZE
0x1F
PDUTYPE2_REFRESH_RECT
0x21
PDUTYPE2_PLAY_SOUND
0x22
PDUTYPE2_SUPPRESS_OUTPUT
0x23
PDUTYPE2_SHUTDOWN_REQUEST
0x24
PDUTYPE2_SHUTDOWN_DENIED
0x25
PDUTYPE2_SAVE_SESSION_INFO
0x26
PDUTYPE2_FONTLIST
0x27
PDUTYPE2_FONTMAP
0x28
PDUTYPE2_SET_KEYBOARD_INDICATORS
0x29
PDUTYPE2_BITMAPCACHE_PERSISTENT_LIST
0x2B
PDUTYPE2_BITMAPCACHE_ERROR_PDU
0x2C
Bitmap Cache Error PDU ([MS-RDPEGDI] section 2.2.2.3.1)
PDUTYPE2_SET_KEYBOARD_IME_STATUS
0x2D
PDUTYPE2_OFFSCRCACHE_ERROR_PDU
0x2E
Offscreen Bitmap Cache Error PDU ([MS-RDPEGDI] section 2.2.2.3.2)
PDUTYPE2_SET_ERROR_INFO_PDU
0x2F
PDUTYPE2_DRAWNINEGRID_ERROR_PDU
0x30
DrawNineGrid Cache Error PDU ([MS-RDPEGDI] section 2.2.2.3.3)
PDUTYPE2_DRAWGDIPLUS_ERROR_PDU
0x31
GDI+ Error PDU ([MS-RDPEGDI] section 2.2.2.3.4)
PDUTYPE2_ARC_STATUS_PDU
0x32
PDUTYPE2_STATUS_INFO_PDU
0x36
PDUTYPE2_MONITOR_LAYOUT_PDU
0x37
compressedType (1 byte): An 8-bit, unsigned integer. The compression type and flags specifying the data following the Share Data Header (section 2.2.8.1.1.1.2).
-
Flag
Meaning
CompressionTypeMask
0x0F
Indicates the package which was used for compression. See the table which follows for a list of compression packages.
PACKET_COMPRESSED
0x20
The payload data is compressed. This flag is equivalent to MPPC bit C (for more information see [RFC2118] section 3.1).
PACKET_AT_FRONT
0x40
The decompressed packet MUST be placed at the beginning of the history buffer. This flag is equivalent to MPPC bit B (for more information see [RFC2118] section 3.1).
PACKET_FLUSHED
0x80
The decompressor MUST reinitialize the history buffer (by filling it with zeros) and reset the HistoryOffset to zero. After it has been reinitialized, the entire history buffer is immediately regarded as valid. This flag is equivalent to MPPC bit A (for more information see [RFC2118] section 3.1). If the PACKET_COMPRESSED (0x20) flag is also present, then the PACKET_FLUSHED flag MUST be processed first.
-
Instructions specifying how to set the compression flags can be found in section 3.1.8.2.1.
-
Possible compression types are as follows.
-
Value
Meaning
PACKET_COMPR_TYPE_8K
0x0
RDP 4.0 bulk compression (section 3.1.8.4.1).
PACKET_COMPR_TYPE_64K
0x1
RDP 5.0 bulk compression (section 3.1.8.4.2).
PACKET_COMPR_TYPE_RDP6
0x2
RDP 6.0 bulk compression ([MS-RDPEGDI] section 3.1.8.1).
PACKET_COMPR_TYPE_RDP61
0x3
RDP 6.1 bulk compression ([MS-RDPEGDI] section 3.1.8.2).
-
Instructions specifying how to compress a data stream are listed in section 3.1.8.2, while decompression of a data stream is described in section 3.1.8.3.
compressedLength (2 bytes): A 16-bit, unsigned integer. The compressed length of the packet in bytes.