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Add BON8 support

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Add to_bon8/from_bon8 and input_format_t::bon8 for BON8, a binary format
that uses the byte values that cannot begin a UTF-8 character as type
markers, so strings need no length prefix. It is the most compact of the
supported binary formats on the benchmark files.

The reader is non-recursive like the other binary readers. A string ends
at the first byte that cannot continue it, so the reader hands the one or
two bytes it reads past a string back to the value that follows. The
writer produces the canonical representation of the specification, except
for NFC normalization; its output is identical to that of the reference
implementation (HikoGUI) on all files of the test data.

The round-trip tests need the .bon8 files of json_test_data 3.2.0.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-09-24 22:53:08 +02:00
parent 4daca40d7b
commit e94e164b07
45 changed files with 3574 additions and 34 deletions
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.github/labeler.yml
+4 -4
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@@ -37,13 +37,13 @@ labels:
files:
- "include/nlohmann/detail/input/binary_reader\\.hpp"
- "include/nlohmann/detail/output/binary_writer\\.hpp"
- "tests/src/unit-(bson|cbor|msgpack|ubjson|bjdata|binary_formats)"
- "tests/src/fuzzer-parse_(bson|cbor|msgpack|ubjson|bjdata)"
- "tests/src/unit-(bson|cbor|msgpack|ubjson|bjdata|bon8|binary_formats)"
- "tests/src/fuzzer-parse_(bson|cbor|msgpack|ubjson|bjdata|bon8)"
- "docs/mkdocs/docs/features/binary_formats/"
- "docs/mkdocs/docs/(api/basic_json|examples)/(to|from)_(bson|cbor|msgpack|ubjson|bjdata)"
- "docs/mkdocs/docs/(api/basic_json|examples)/(to|from)_(bson|cbor|msgpack|ubjson|bjdata|bon8)"
- label: "aspect: binary formats"
title: "(?i)(bson|cbor|msgpack|messagepack|ubjson|bjdata|binary format)"
title: "(?i)(bson|cbor|msgpack|messagepack|ubjson|bjdata|bon8|binary format)"
- label: "python"
files: