55 lines
1.7 KiB
Markdown
55 lines
1.7 KiB
Markdown
# Test Case: DEFLATE Level 1 Read Correctness
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**Test ID**: TC102-deflate-level1
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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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## Objective
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Verify full and offset reads from an erofs-utils 1.8.6 DEFLATE level 1 image.
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## Fixture and Helper
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```sh
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work=$(mktemp -d /tmp/repo22-tc102.XXXXXX)
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tests/prepare_error_fixtures.sh "$work/fixtures"
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cc -O2 -Wall -Wextra -std=c17 tests/read_probe.c -o "$work/read_probe"
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dump.erofs -s "$work/fixtures/valid-deflate-level1.erofs"
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dump.erofs --path=/compressed.bin -e \
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"$work/fixtures/valid-deflate-level1.erofs"
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```
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The superblock and extent output must identify DEFLATE-compressed data. The
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image is generated with `-zdeflate,level=1 -C65536`.
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## FreeBSD Procedure
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```sh
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mkdir "$work/mnt"
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unit=$(mdconfig -a -t vnode \
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-f "$work/fixtures/valid-deflate-level1.erofs")
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mount -t erofs -o ro "/dev/$unit" "$work/mnt"
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expected=$(sha256 -q "$work/fixtures/source/compressed.bin")
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actual=$(sha256 -q "$work/mnt/compressed.bin")
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test "$actual" = "$expected"
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"$work/read_probe" pread "$work/mnt/compressed.bin" 32768 4096 \
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"$work/guest-range.bin"
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"$work/read_probe" pread "$work/fixtures/source/compressed.bin" 32768 4096 \
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"$work/source-range.bin"
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cmp "$work/source-range.bin" "$work/guest-range.bin"
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umount "$work/mnt"
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mdconfig -d -u "${unit#md}"
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```
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## Expected Results
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The complete mounted-file hash equals the source hash, and the fixed 4 KiB
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range compares byte-for-byte. The invalid former command
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`sha256 output vs original` is not used.
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