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Document BSON interoperability and subtype-less binary round trips (#5330)

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- warn about BSON marker 0x11 interoperability in both directions
- explain subtype-less binary normalization to subtype 0x00
- add a round-trip test for binary values without a subtype

Signed-off-by: YingqiDuan <141370165+YingqiDuan@users.noreply.github.com>
This commit is contained in:
YingqiDuan
2026-07-31 08:33:07 +02:00
committed by GitHub
parent dd24e2dffd
commit de8a099ba5
2 changed files with 50 additions and 2 deletions
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tests/src/unit-bson.cpp
+35
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@@ -529,6 +529,41 @@ TEST_CASE("BSON")
CHECK(json::from_bson(result, true, false) == j);
}
SECTION("non-empty object with binary member without subtype")
{
const size_t N = 10;
const auto s = std::vector<std::uint8_t>(N, 'x');
json const j =
{
{ "entry", json::binary(s) }
};
CHECK(!j.at("entry").get_binary().has_subtype());
std::vector<std::uint8_t> const expected =
{
0x1B, 0x00, 0x00, 0x00, // size (little endian)
0x05, // entry: binary
'e', 'n', 't', 'r', 'y', '\x00',
0x0A, 0x00, 0x00, 0x00, // size of binary (little endian)
0x00, // Generic binary subtype
0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78, 0x78,
0x00 // end marker
};
const auto result = json::to_bson(j);
CHECK(result == expected);
// roundtrip adds the generic binary subtype
const auto roundtrip = json::from_bson(result);
CHECK(roundtrip != j);
CHECK(roundtrip.at("entry").get_binary().has_subtype());
CHECK(roundtrip.at("entry").get_binary().subtype() == 0);
CHECK(json::from_bson(result, true, false) == roundtrip);
}
SECTION("non-empty object with binary member with subtype")
{
// an MD5 hash