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tests/files/README: Explain how to recreate the ARM64 test files.
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@ -76,10 +76,23 @@
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good-1-arm64-lzma2-1.xz uses the ARM64 filter and LZMA2. The
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uncompressed data is constructed so that it tests integer
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wrap around and sign extension.
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wrap around and sign extension. To recreate the file, compress
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using XZ Utils 5.4.x (newer may or may not work too):
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./debug/testfilegen-arm64 \
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| xz -T1 -Ccrc32 --arm64 \
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--lzma2=dict=64KiB,lp=2,lc=2 \
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> good-1-arm64-lzma2-1.xz
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good-1-arm64-lzma2-2.xz is like good-1-arm64-lzma2-1.xz but with
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non-zero start offset. XZ Embedded doesn't support this file.
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To recreate the file, compress using XZ Utils 5.4.x (newer may or
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may not work too):
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./debug/testfilegen-arm64 \
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| xz -T1 -Ccrc32 --arm64=start=4294963200 \
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--lzma2=dict=64KiB,lp=2,lc=2 \
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> good-1-arm64-lzma2-2.xz
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good-1-lzma2-1.xz has two LZMA2 chunks, of which the second sets
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new properties.
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