47 lines
1.4 KiB
Markdown
47 lines
1.4 KiB
Markdown
# Test Case: DEFLATE Compression Level 9
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**Test ID**: TC104-deflate-level9
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**G5 fixture contract**: Use [G5-MANUAL-SETUP.md](G5-MANUAL-SETUP.md).
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Its generated paths, source comparisons, structured corruption offsets, and
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cleanup rules supersede placeholder examples in this file.
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**Category**: Compression
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**Priority**: High
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**Regression**: None
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## Objective
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Verify DEFLATE compressed data path with level 9 (maximum) compression.
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## Preconditions
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- EROFS image created with DEFLATE level 9: `mkfs.erofs -zdeflate,level=9 test.img src/`
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- Large test files (1MB+) for compression testing
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- FreeBSD 13.0+ with zlib support
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## Test Steps
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1. Create image with DEFLATE level 9 compression
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2. Attach and mount: `unit=$(mdconfig -a -t vnode -f test.img); mount -t erofs -o ro /dev/${unit} /mnt`
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3. Read large compressed files sequentially
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4. Test random access throughout file
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5. Measure decompression performance
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## Expected Results
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- All files decompress correctly
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- Best compression ratio among DEFLATE levels
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- Slightly slower decompression acceptable
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- No data corruption
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## Verification Method
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- Verify checksums match original files
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- Compression ratio > level 6
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- Decompression throughput > 50 MB/s
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- Random access correctness validated
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## Cleanup
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```sh
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umount /mnt
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mdconfig -d -u "${unit}"
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```
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## Notes
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Tests feature 58: DEFLATE compressed data path with maximum compression.
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