FA-52822 / Raster memory layout / Member archive

Chunked Row Groups: Group start omits intervening headers or directory prefix · case 02

The returned physical layout descriptor disagrees with the declared buffer mapping at group_origin.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Rows are grouped in packets of three scanlines. Each group has a five-byte header and every full allocated row has a two-byte checksum. Last group stores only actual rows, with a seven-byte directory record per group. Return the named intermediate layout descriptor and final address fields; all quantities are integer byte offsets unless explicitly stated.

Why this case matters

Offline raster resource, upload, readback, and storage-layout regression model.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
layout fixture 3	`{"address": 282, "allocation_end": 373, "checksum": 291, "directory_bytes": 21, "group_count": 3, "group_id": 2, "group_origin": 253, "group_row": 0, "group_sizes": [110, 110, 110], "row_span": 35}`	`{"address": 292, "allocation_end": 373, "checksum": 301, "directory_bytes": 21, "group_count": 3, "group_id": 2, "group_origin": 263, "group_row": 0, "group_sizes": [110, 110, 110], "row_span": 35}`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.