Niels Lohmann e072480872 Share the IEEE half-precision decoder between CBOR and BJData ...

binary_reader had two ~45-line copies of the IEEE 754 half-precision
decoder: CBOR's case 0xF9 and BJData's case 'h'. Once formatting is
normalised, the two blocks were identical except for the byte order
used to assemble the 16-bit half (CBOR is big endian, BJData is little
endian). Any future change to half-float decoding had to be made and
kept in sync in both places.

Add one get_half_float(format, little_endian) helper that does the two
get()/unexpect_eof() reads, assembles the half in the requested byte
order, decodes it per RFC 8949 Appendix D, and calls sax->number_float.
Both cases now just call it with their byte order; the BJData case
keeps its bjdata-only guard.

Behavior, the public API and the ABI are unchanged. Verified with a
scratch probe comparing the old and new decoders bit-for-bit (NaN by
isnan()) over all 65536 wire byte pairs, in both formats, and by
running unit-cbor and unit-bjdata (offline, against the stubbed
test_data.hpp).

Part of #5711

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

2026-09-30 10:19:57 +02:00

..

json_fwd.hpp

Make JSON_STRICT_NUL_HANDLING part of the ABI tag (#5560)

2026-09-25 21:54:11 +02:00

json.hpp

Share the IEEE half-precision decoder between CBOR and BJData

2026-09-30 10:19:57 +02:00