More robust detection of bzip2 magic number #6308
Merged
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Closes #6304
Also took the opportunity to factor out some helpers for easier maintenance/readability. That could be split to its own precursor PR if so desired.
We could extend
is_bzip()
to also look for "raw pi" (as.raw(c(0x31, 0x41, 0x59, 0x26, 0x53, 0x59))
) in the 5th-10th bytes, but skip that for now. The example seems pretty pathological already.Also, I don't think that any of our
test_R.utils
tests have been checking the "infer from magic number" functionality fromfread()
, so this PR also adds some nice regression coverage for this behavior.