2.2.3.1.3 SMB2_COMPRESSION_CAPABILITIES
The SMB2_COMPRESSION_CAPABILITIES context is specified in an SMB2 NEGOTIATE request by the client to indicate which compression algorithms the client supports. The format of the data in the Data field of this SMB2_NEGOTIATE_CONTEXT is as follows.
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CompressionAlgorithmCount |
Padding |
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Flags |
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CompressionAlgorithms (variable) |
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CompressionAlgorithmCount (2 bytes): The number of elements in CompressionAlgorithms array.
Padding (2 bytes): The sender MUST set this to 0, and the receiver MUST ignore it on receipt.
Flags (4 bytes): This field MUST be set to one of the following values:
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Value
Meaning
SMB2_COMPRESSION_CAPABILITIES_FLAG_NONE
0x00000000
Chained compression is not supported.
SMB2_COMPRESSION_CAPABILITIES_FLAG_CHAINED
0x00000001
Chained compression is supported on this connection.
CompressionAlgorithms (variable): An array of 16-bit integer IDs specifying the supported compression algorithms. These IDs MUST be in order of preference from most to least. The following IDs are defined.
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Value
Meaning
NONE
0x0000
No compression
LZNT1
0x0001
LZNT1 compression algorithm
LZ77
0x0002
LZ77 compression algorithm
LZ77+Huffman
0x0003
LZ77+Huffman compression algorithm
Pattern_V1
0x0004
Pattern Scanning algorithm
LZ4
0x0005
LZ4 compression algorithm