Range measured: level 0 SBlk, 24..19508, aligned at +0 -- 487 whole records.
Method: for each of 40 candidate alignments, count byte positions that are
near-constant across records, and keep the best. Alignment +0 wins with 10.
Four positions are exactly constant and all zero: 7, 11, 31 and 35.
Distinct values per position run from 1 to 155, with position 29 the most
variable by a wide margin -- 155 against 21 to 48 elsewhere -- and positions
2, 10, 27, 34 and 39 low at 2 to 8.
The first record carries the SBlk magic and the DAW tag rather than descriptor
data, so it is a header rather than an entry. That matters before reading any
field at a fixed offset.
Not decoded: the layout is established and the constant positions are known,
but the fields are not named and which of the 40 bytes are an index, a length
and an offset is still open.
ReaperOfVeriod
e9c927994c