Use more constants instead of literals

[michielp1807]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 41.93548% with 18 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
lib/compress/zstd_compress.rs	21.42%	11 Missing ⚠️
lib/compress/hist.rs	0.00%	4 Missing ⚠️
lib/compress/zstd_lazy.rs	0.00%	2 Missing ⚠️
lib/compress/zstd_compress_superblock.rs	0.00%	1 Missing ⚠️

Flag	Coverage Δ
test-aarch64-apple-darwin	33.69% <41.93%> (-0.30%)	⬇️
test-aarch64-unknown-linux-gnu	32.57% <41.93%> (+0.01%)	⬆️
test-i686-unknown-linux-gnu	32.66% <41.93%> (-0.01%)	⬇️
test-x86_64-unknown-linux-gnu	33.71% <41.93%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
lib/common/zstd_internal.rs	91.52% <ø> (ø)
lib/compress/huf_compress.rs	81.39% <100.00%> (ø)
lib/compress/zstd_ldm.rs	2.33% <ø> (ø)
lib/compress/zstd_preSplit.rs	71.26% <100.00%> (ø)
lib/compress/zstd_compress_superblock.rs	0.00% <0.00%> (ø)
lib/compress/zstd_lazy.rs	0.00% <0.00%> (ø)
lib/compress/hist.rs	71.62% <0.00%> (ø)
lib/compress/zstd_compress.rs	36.17% <21.42%> (-1.88%)	⬇️

... and 1 file with indirect coverage changes

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