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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/src/unit-binary_formats.cpp
+15
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@@ -25,6 +25,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
const auto bjdata_1_size = json::to_bjdata(j).size();
const auto bjdata_2_size = json::to_bjdata(j, true).size();
const auto bjdata_3_size = json::to_bjdata(j, true, true).size();
const auto bon8_size = json::to_bon8(j).size();
const auto bson_size = json::to_bson(j).size();
const auto cbor_size = json::to_cbor(j).size();
const auto msgpack_size = json::to_msgpack(j).size();
@@ -36,6 +37,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
CHECK(bjdata_1_size == 1112030);
CHECK(bjdata_2_size == 1224148);
CHECK(bjdata_3_size == 1224148);
CHECK(bon8_size == 1055792);
CHECK(bson_size == 1794522);
CHECK(cbor_size == 1055552);
CHECK(msgpack_size == 1056145);
@@ -47,6 +49,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
CHECK((100.0 * double(bjdata_1_size) / double(json_size)) == Approx(53.199));
CHECK((100.0 * double(bjdata_2_size) / double(json_size)) == Approx(58.563));
CHECK((100.0 * double(bjdata_3_size) / double(json_size)) == Approx(58.563));
CHECK((100.0 * double(bon8_size) / double(json_size)) == Approx(50.509));
CHECK((100.0 * double(bson_size) / double(json_size)) == Approx(85.849));
CHECK((100.0 * double(cbor_size) / double(json_size)) == Approx(50.497));
CHECK((100.0 * double(msgpack_size) / double(json_size)) == Approx(50.526));
@@ -64,6 +67,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
const auto bjdata_1_size = json::to_bjdata(j).size();
const auto bjdata_2_size = json::to_bjdata(j, true).size();
const auto bjdata_3_size = json::to_bjdata(j, true, true).size();
const auto bon8_size = json::to_bon8(j).size();
const auto bson_size = json::to_bson(j).size();
const auto cbor_size = json::to_cbor(j).size();
const auto msgpack_size = json::to_msgpack(j).size();
@@ -75,6 +79,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
CHECK(bjdata_1_size == 425342);
CHECK(bjdata_2_size == 429970);
CHECK(bjdata_3_size == 429970);
CHECK(bon8_size == 391396);
CHECK(bson_size == 444568);
CHECK(cbor_size == 402814);
CHECK(msgpack_size == 401510);
@@ -86,6 +91,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
CHECK((100.0 * double(bjdata_1_size) / double(json_size)) == Approx(91.097));
CHECK((100.0 * double(bjdata_2_size) / double(json_size)) == Approx(92.089));
CHECK((100.0 * double(bjdata_3_size) / double(json_size)) == Approx(92.089));
CHECK((100.0 * double(bon8_size) / double(json_size)) == Approx(83.828));
CHECK((100.0 * double(bson_size) / double(json_size)) == Approx(95.215));
CHECK((100.0 * double(cbor_size) / double(json_size)) == Approx(86.273));
CHECK((100.0 * double(msgpack_size) / double(json_size)) == Approx(85.993));
@@ -103,6 +109,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
const auto bjdata_1_size = json::to_bjdata(j).size();
const auto bjdata_2_size = json::to_bjdata(j, true).size();
const auto bjdata_3_size = json::to_bjdata(j, true, true).size();
const auto bon8_size = json::to_bon8(j).size();
const auto bson_size = json::to_bson(j).size();
const auto cbor_size = json::to_cbor(j).size();
const auto msgpack_size = json::to_msgpack(j).size();
@@ -114,6 +121,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
CHECK(bjdata_1_size == 390781);
CHECK(bjdata_2_size == 433557);
CHECK(bjdata_3_size == 432964);
CHECK(bon8_size == 317879);
CHECK(bson_size == 479430);
CHECK(cbor_size == 342373);
CHECK(msgpack_size == 342473);
@@ -125,6 +133,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
CHECK((100.0 * double(bjdata_1_size) / double(json_size)) == Approx(78.109));
CHECK((100.0 * double(bjdata_2_size) / double(json_size)) == Approx(86.659));
CHECK((100.0 * double(bjdata_3_size) / double(json_size)) == Approx(86.541));
CHECK((100.0 * double(bon8_size) / double(json_size)) == Approx(63.538));
CHECK((100.0 * double(bson_size) / double(json_size)) == Approx(95.828));
CHECK((100.0 * double(cbor_size) / double(json_size)) == Approx(68.433));
CHECK((100.0 * double(msgpack_size) / double(json_size)) == Approx(68.453));
@@ -142,6 +151,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
const auto bjdata_1_size = json::to_bjdata(j).size();
const auto bjdata_2_size = json::to_bjdata(j, true).size();
const auto bjdata_3_size = json::to_bjdata(j, true, true).size();
const auto bon8_size = json::to_bon8(j).size();
const auto bson_size = json::to_bson({{"", j}}).size(); // wrap array in object for BSON
const auto cbor_size = json::to_cbor(j).size();
const auto msgpack_size = json::to_msgpack(j).size();
@@ -153,6 +163,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
CHECK(bjdata_1_size == 50710965);
CHECK(bjdata_2_size == 51144830);
CHECK(bjdata_3_size == 51144830);
CHECK(bon8_size == 45942080);
CHECK(bson_size == 56008520);
CHECK(cbor_size == 46187320);
CHECK(msgpack_size == 46158575);
@@ -164,6 +175,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
CHECK((100.0 * double(bjdata_1_size) / double(json_size)) == Approx(96.576));
CHECK((100.0 * double(bjdata_2_size) / double(json_size)) == Approx(97.402));
CHECK((100.0 * double(bjdata_3_size) / double(json_size)) == Approx(97.402));
CHECK((100.0 * double(bon8_size) / double(json_size)) == Approx(87.494));
CHECK((100.0 * double(bson_size) / double(json_size)) == Approx(106.665));
CHECK((100.0 * double(cbor_size) / double(json_size)) == Approx(87.961));
CHECK((100.0 * double(msgpack_size) / double(json_size)) == Approx(87.906));
@@ -181,6 +193,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
const auto bjdata_1_size = json::to_bjdata(j).size();
const auto bjdata_2_size = json::to_bjdata(j, true).size();
const auto bjdata_3_size = json::to_bjdata(j, true, true).size();
const auto bon8_size = json::to_bon8(j).size();
// BSON cannot process the file as it contains code point U+0000
const auto cbor_size = json::to_cbor(j).size();
const auto msgpack_size = json::to_msgpack(j).size();
@@ -192,6 +205,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
CHECK(bjdata_1_size == 148695);
CHECK(bjdata_2_size == 150569);
CHECK(bjdata_3_size == 150569);
CHECK(bon8_size == 144477);
CHECK(cbor_size == 147095);
CHECK(msgpack_size == 147017);
CHECK(ubjson_1_size == 148695);
@@ -202,6 +216,7 @@ TEST_CASE("Binary Formats" * doctest::skip())
CHECK((100.0 * double(bjdata_1_size) / double(json_size)) == Approx(88.153));
CHECK((100.0 * double(bjdata_2_size) / double(json_size)) == Approx(89.264));
CHECK((100.0 * double(bjdata_3_size) / double(json_size)) == Approx(89.264));
CHECK((100.0 * double(bon8_size) / double(json_size)) == Approx(85.653));
CHECK((100.0 * double(cbor_size) / double(json_size)) == Approx(87.205));
CHECK((100.0 * double(msgpack_size) / double(json_size)) == Approx(87.158));
CHECK((100.0 * double(ubjson_1_size) / double(json_size)) == Approx(88.153));