36 lines
1.2 KiB
Markdown
36 lines
1.2 KiB
Markdown
# Test Case: Tailpacking Block Boundaries
|
|
|
|
**Test ID**: TC034-tailpacking-boundary
|
|
|
|
## Objective
|
|
|
|
Verify the actual erofs-utils boundary choices at 4095, 4096, and 4097 bytes,
|
|
including the one-byte inline tail case.
|
|
|
|
## Fixture
|
|
|
|
Use `images/inline.erofs` and the three matching files under `source/inline`.
|
|
Structured evidence requires layouts `0,0,2` respectively. A 4095-byte payload
|
|
cannot fit beside a 32-byte inode in one 4096-byte metadata block, so it is not
|
|
claimed as fully inline.
|
|
|
|
## Procedure
|
|
|
|
```sh
|
|
for size in 4095 4096 4097; do
|
|
stat -f '%N size=%z blocks=%b' "$mnt/file-$size.dat"
|
|
cmp "/tmp/repo22-g1/source/inline/file-$size.dat" "$mnt/file-$size.dat"
|
|
sha256 "/tmp/repo22-g1/source/inline/file-$size.dat" "$mnt/file-$size.dat"
|
|
done
|
|
./read_probe pread "$mnt/file-4097.dat" 4088 9 /tmp/tc034-boundary
|
|
dd if=/tmp/repo22-g1/source/inline/file-4097.dat \
|
|
of=/tmp/tc034-source bs=1 skip=4088 count=9 2>/dev/null
|
|
cmp /tmp/tc034-source /tmp/tc034-boundary
|
|
```
|
|
|
|
## Expected Results
|
|
|
|
- Exact sizes and full hashes match for all three files.
|
|
- 4095 and 4096 are FLAT_PLAIN; 4097 is FLAT_INLINE with a one-byte tail.
|
|
- The nine-byte cross-boundary range matches; cleanup succeeds.
|