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2.1.1: one MessagePack container prefix helper (#5891)

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Array and object prefixes differed only in the fix marker and the 16/32-bit
markers; both now delegate to write_msgpack_container_prefix. Output is
byte-identical.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann committed 2026-10-23 10:29:08 +02:00
1 parent 058d6fd23d
commit c9c9b90f1f
1 file changed
+20 -25
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include/nlohmann/detail/output/binary_writer.hpp
+20 -25
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@@ -928,48 +928,43 @@ class binary_writer
JSON_THROW(other_error::create(exception_id::size_marker_required, "use_type requires use_size = true", &j));
}
void write_msgpack_array_prefix(const std::size_t N, const BasicJsonType& j)
/// @brief write the MessagePack prefix of an array or object with @a N
/// elements: the fix marker @a fix_marker | n, or @a marker_16 or
/// @a marker_32 followed by the length
JSON_HEDLEY_ALWAYS_INLINE
void write_msgpack_container_prefix(const std::size_t N, const BasicJsonType& j,
const std::uint8_t fix_marker, const std::uint8_t marker_16, const std::uint8_t marker_32)
{
const auto n = to_msgpack_length(N, j);
if (n <= 15)
{
// fixarray
oa.write_character(to_char_type(static_cast<std::uint8_t>(0x90 | n)));
// fixarray, fixmap
oa.write_character(to_char_type(static_cast<std::uint8_t>(fix_marker | n)));
}
else if (n <= (std::numeric_limits<std::uint16_t>::max)())
{
// array 16
oa.write_character(to_char_type(0xDC));
// array 16, map 16
oa.write_character(to_char_type(marker_16));
write_number(static_cast<std::uint16_t>(n));
}
else
{
// array 32
oa.write_character(to_char_type(0xDD));
// array 32, map 32
oa.write_character(to_char_type(marker_32));
write_number(static_cast<std::uint32_t>(n));
}
}
JSON_HEDLEY_ALWAYS_INLINE
void write_msgpack_array_prefix(const std::size_t N, const BasicJsonType& j)
{
write_msgpack_container_prefix(N, j, 0x90, 0xDC, 0xDD);
}
JSON_HEDLEY_ALWAYS_INLINE
void write_msgpack_object_prefix(const std::size_t N, const BasicJsonType& j)
{
const auto n = to_msgpack_length(N, j);
if (n <= 15)
{
// fixmap
oa.write_character(to_char_type(static_cast<std::uint8_t>(0x80 | (n & 0xF))));
}
else if (n <= (std::numeric_limits<std::uint16_t>::max)())
{
// map 16
oa.write_character(to_char_type(0xDE));
write_number(static_cast<std::uint16_t>(n));
}
else
{
// map 32
oa.write_character(to_char_type(0xDF));
write_number(static_cast<std::uint32_t>(n));
}
write_msgpack_container_prefix(N, j, 0x80, 0xDE, 0xDF);
}
/// @brief a CBOR, MessagePack, or BON8 array or object whose elements