The diagnostic hashed IFO contents but not where they came from, so a
content difference could not be told apart from a path resolving to a
different place. It now prints file_start_lba and file_extents next to the
hash.
That measurement is what inverted this investigation: both a CSS disc and
its decrypted copy resolve VIDEO_TS.IFO to the same extent, and only one
sector of the fourteen differs — by exactly a descrambled payload with the
scrambling-control bits cleared. So the decrypted copy holds the correct
bytes, and an iso:// scan of a CSS disc is parsing a still-scrambled IFO
sector, because scan_iso opens a plain FileSectorSource.
Matthew Jackson
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