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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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tests/fuzzing.md
+3 -3
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@@ -1,6 +1,6 @@
# Fuzz testing
Each parser of the library (JSON, BJData, BSON, CBOR, MessagePack, and UBJSON) can be fuzz tested. Currently,
Each parser of the library (JSON, BJData, BON8, BSON, CBOR, MessagePack, and UBJSON) can be fuzz tested. Currently,
[libFuzzer](https://llvm.org/docs/LibFuzzer.html) and [afl++](https://github.com/AFLplusplus/AFLplusplus) are supported.
## Corpus creation
@@ -10,11 +10,11 @@ directory with some simple input files that cover several features of the parser
for mutations.
```shell
TEST_DATA_VERSION=3.1.0
TEST_DATA_VERSION=3.2.0
wget https://github.com/nlohmann/json_test_data/archive/refs/tags/v$TEST_DATA_VERSION.zip
unzip v$TEST_DATA_VERSION.zip
rm v$TEST_DATA_VERSION.zip
for FORMAT in json bjdata bson cbor msgpack ubjson
for FORMAT in json bjdata bon8 bson cbor msgpack ubjson
do
rm -fr corpus_$FORMAT
mkdir corpus_$FORMAT