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tests/files/README: Explain how to recreate the ARM64 test files.

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(cherry picked from commit 2a851e06b891ce894f918faff32a6cca6fdecee6)
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Lasse Collin 2024-04-08 22:02:45 +03:00
parent 112fa0aba6
commit fa76e3ef59
1 changed files with 14 additions and 1 deletions
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tests/files/README
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@ -76,10 +76,23 @@
good-1-arm64-lzma2-1.xz uses the ARM64 filter and LZMA2. The
uncompressed data is constructed so that it tests integer
wrap around and sign extension.
wrap around and sign extension. To recreate the file, compress
using XZ Utils 5.4.x (newer may or may not work too):
./debug/testfilegen-arm64 \
| xz -T1 -Ccrc32 --arm64 \
--lzma2=dict=64KiB,lp=2,lc=2 \
> good-1-arm64-lzma2-1.xz
good-1-arm64-lzma2-2.xz is like good-1-arm64-lzma2-1.xz but with
non-zero start offset. XZ Embedded doesn't support this file.
To recreate the file, compress using XZ Utils 5.4.x (newer may or
may not work too):
./debug/testfilegen-arm64 \
| xz -T1 -Ccrc32 --arm64=start=4294963200 \
--lzma2=dict=64KiB,lp=2,lc=2 \
> good-1-arm64-lzma2-2.xz
good-1-lzma2-1.xz has two LZMA2 chunks, of which the second sets
new properties.