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Add an error_handler parameter for UTF-8 to the binary readers and writers (#5746)

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Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-10-04 12:13:49 +02:00
committed by GitHub
parent f56b418c56
commit 73e9eae3c1
30 changed files with 1794 additions and 422 deletions
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docs/mkdocs/docs/api/basic_json/to_ubjson.md
+18 -8
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@@ -4,13 +4,16 @@
// (1)
static std::vector<std::uint8_t> to_ubjson(const basic_json& j,
const bool use_size = false,
const bool use_type = false);
const bool use_type = false,
const error_handler_t error_handler = error_handler_t::keep);
// (2)
static void to_ubjson(const basic_json& j, detail::output_adapter<std::uint8_t> o,
const bool use_size = false, const bool use_type = false);
const bool use_size = false, const bool use_type = false,
const error_handler_t error_handler = error_handler_t::keep);
static void to_ubjson(const basic_json& j, detail::output_adapter<char> o,
const bool use_size = false, const bool use_type = false);
const bool use_size = false, const bool use_type = false,
const error_handler_t error_handler = error_handler_t::keep);
```
Serializes a given JSON value `j` to a byte vector using the UBJSON (Universal Binary JSON) serialization format. UBJSON
@@ -36,6 +39,12 @@ The exact mapping and its limitations are described on a [dedicated page](../../
: whether to add type annotations to container types (must be combined with `#!cpp use_size = true`); optional,
`#!cpp false` by default.
`error_handler` (in)
: how to treat a string or object key in `j` that is not valid UTF-8; see [`error_handler_t`](error_handler_t.md).
The default, `keep`, writes the ill-formed bytes to the output as is, as every version of `to_ubjson` did before
this parameter was added; `strict` throws; `replace`/`ignore` sanitize it the same way [`dump`](dump.md) would.
If [`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled, the default is `strict` instead.
## Return value
1. UBJSON serialization as a byte vector
@@ -49,9 +58,9 @@ Strong guarantee: if an exception is thrown, there are no changes in the JSON va
- Throws [`other_error.502`](../../home/exceptions.md#jsonexceptionother_error502) if `use_type` is true and `use_size`
is false, and `j` contains a non-empty array, object, or binary value.
- Throws [type_error.316](../../home/exceptions.md#jsonexceptiontype_error316) if a string or object key in `j` is not
valid UTF-8 and [`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled; otherwise, the bytes are
written unchanged
- Throws [type_error.316](../../home/exceptions.md#jsonexceptiontype_error316) if a string or object key in `j` is
not valid UTF-8 and `error_handler` is `strict` (the default only if
[`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled)
## Complexity
@@ -100,5 +109,6 @@ Linear in the size of the JSON value `j`.
## Version history
- Added in version 3.1.0.
- Throwing `type_error.316` for a string or object key that is not valid UTF-8 if
[`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled added in version 3.13.0.
- Added `error_handler` parameter in version 3.13.0. Its default, `keep`, writes the bytes of a string or object key
that is not valid UTF-8 unchanged, as before; `strict` (the default if
[`JSON_STRICT_BINARY_UTF8`](../macros/json_strict_binary_utf8.md) is enabled) throws `type_error.316`.