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MSSIPOTF_E_TABLE_CHECKSUM
One table does not match its directory checksum
MSSIPOTF_E_TABLE_CHECKSUM is local to one table record. The table directory stores a checksum for the table bytes identified by that record. A mismatch can reveal damaged data, a stale checksum after editing, or an offset/length that now selects the wrong bytes.
It differs from MSSIPOTF_E_FILE_CHECKSUM, which is based on the entire font and the checkSumAdjustment field in head. Correcting only the file-wide adjustment can conceal neither a damaged table nor a stale per-table directory checksum.
How to investigate
- Identify the failing tag, then verify its offset and length before recomputing its checksum.
- Compare the table payload with the source build to distinguish corruption from an intentional edit.
- After rebuilding the directory checksum, recalculate the font-wide checksum adjustment and re-sign if applicable.
References
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