Test Case: LZMA Large File Decompression

Test ID: TC108-lzma-large-file

G5 fixture contract: Use G5-MANUAL-SETUP.md. Its generated paths, source comparisons, structured corruption offsets, and cleanup rules supersede placeholder examples in this file. Category: Compression
Priority: High
Regression: None

Objective

Verify LZMA decompression works correctly for large files (100MB+).

Preconditions

images/lzma-large.erofs, generated with LZMA level 6
/large.bin and sources/lzma-large/large.bin, exactly 104857601 bytes
FreeBSD 13.0+ with liblzma

Test Steps

Create image with large LZMA-compressed file
Attach and mount: unit=$(mdconfig -a -t vnode -f test.img); mount -t erofs -o ro /dev/${unit} /mnt
Compare complete source and guest SHA256, then run timeout 1800 cmp SOURCE /mnt/large.bin.
Compare 4096 bytes at offsets 0, 52428800, and 103809024 with the source.
Record vmstat -m while mounted and after cleanup; active EROFS allocations must return to zero.

Expected Results

Large file reads successfully
Checksum matches original
Random access works at any offset
Memory usage < 256MB during decompression

Verification Method

SHA256 checksum verification
Random read correctness at offsets: 0, 50MB, 99MB
Memory usage monitored via top
No kernel panics or OOM

Cleanup

umount /mnt
mdconfig -d -u "${unit#md}"
rm -f /tmp/out

Notes

Tests feature 60: LZMA decompression with large files.

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