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3.1.4.4.1 Algorithm for Scanning Data Patterns V1

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Construct a new SMB2_COMPRESSION_PATTERN_PAYLOAD_V1 structure, specified in section 2.2.42.2.2 and scan forward in the buffer for a consecutive series of bytes equal to the first byte:

  • For each consecutive byte matched, SMB2_COMPRESSION_PATTERN_PAYLOAD_V1.Repetitions MUST be incremented by 1.

§ If none, stop scan.

If SMB2_COMPRESSION_PATTERN_PAYLOAD_V1.Repetitions is less than 64, SMB2_COMPRESSION_PATTERN_PAYLOAD_V1.Repetitions MUST be set to 0. SMB2_COMPRESSION_PATTERN_PAYLOAD_V1.Pattern MUST be set to the first byte in the buffer.

If SMB2_COMPRESSION_PATTERN_PAYLOAD_V1.Repetitions is equal to the size of the buffer, the processing MUST return the SMB2_COMPRESSION_PATTERN_PAYLOAD_V1 as ForwardDataPattern, and BackwardDataPattern set to NULL.

Otherwise, construct a new SMB2_COMPRESSION_PATTERN_PAYLOAD_V1 structure, specified in section 2.2.42.2.2 and scan backward in the buffer for a consecutive series of bytes equal to the last byte:

  • For each consecutive byte matched, SMB2_COMPRESSION_PATTERN_PAYLOAD_V1.Repetitions MUST be incremented by 1.

§ If none, stop scan.

If SMB2_COMPRESSION_PATTERN_PAYLOAD_V1.Repetitions is less than 64, SMB2_COMPRESSION_PATTERN_PAYLOAD_V1.Repetitions MUST be set to 0. SMB2_COMPRESSION_PATTERN_PAYLOAD_V1.Pattern MUST be set to the last byte in the buffer.

The processing MUST return both SMB2_COMPRESSION_PATTERN_PAYLOAD_V1 structures respectively as ForwardDataPattern and BackwardDataPattern.