Port netcdf c 3093#260
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Port netcdf-c PR #3093 -- all quantization loops in ccr_bgr() and ccr_gbr() now skip ±0.0 and NaN via (val != 0.0 && !isnan(val)), superseding the bit-pattern u*_ptr[idx] != 0U checks that only caught +0.0. The has_mss_val == 0 fallback now uses NaN as a no-op sentinel (NC_FILL_FLOAT/DOUBLE macros dropped).
The loop bodies have well-defined behavior only for finite inputs:
BitRound's per-value bit-shift becomes an out-of-range shift on ±Inf
(undefined behavior), and BitGroom's loop turns ±Inf bit patterns
into NaN by ORing low mantissa bits. Both guards now use isfinite(val)
instead of !isnan(val) to block ±Inf in addition to NaN. New h5filter_specials_{bitround,bitgroom} round-trip tests
write NaN, ±Inf, ±0.0, and normal values via H5Pset_filter, read back,
and assert in C that the special values pass through unchanged while
at least one normal value was quantized.
ajelenak
requested review from
bmribler,
brtnfld,
fortnern,
glennsong09,
jhendersonHDF,
lrknox and
mattjala
as code owners
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ccr_gbr() now skip ±0.0 and NaN.