📡 add more docs (#5231)

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-07-04 11:13:25 +02:00
committed by GitHub
parent 899cf31255
commit c034480c22
38 changed files with 597 additions and 65 deletions
@@ -123,7 +123,7 @@ The library uses the following mapping from JSON values types to BJData types ac
The current version of this library does not yet support automatic detection of and conversion from a nested JSON
array input to a BJData ND-array.
[JDataAAFmt]: https://github.com/NeuroJSON/jdata/blob/master/JData_specification.md#annotated-storage-of-n-d-arrays)
[JDataAAFmt]: https://github.com/NeuroJSON/jdata/blob/master/JData_specification.md#annotated-storage-of-n-d-arrays
!!! info "Restrictions in optimized data types for arrays and objects"
@@ -146,7 +146,7 @@ The library uses the following mapping from JSON values types to BJData types ac
suggested by the BJData documentation. In particular, this means that the serialization and the deserialization of
JSON containing binary values into BJData and back will result in a different JSON object.
[BJDataBinArr]: https://github.com/NeuroJSON/bjdata/blob/master/Binary_JData_Specification.md#optimized-binary-array)
[BJDataBinArr]: https://github.com/NeuroJSON/bjdata/blob/master/Binary_JData_Specification.md#optimized-binary-array
??? example
@@ -52,28 +52,29 @@ The library uses the following mapping from JSON values types to BSON types:
The library maps BSON record types to JSON value types as follows:
| BSON type | BSON marker byte | JSON value type |
|-----------------------|------------------|-----------------|
| double | 0x01 | number_float |
| string | 0x02 | string |
| document | 0x03 | object |
| array | 0x04 | array |
| binary | 0x05 | binary |
| undefined | 0x06 | *unsupported* |
| ObjectId | 0x07 | *unsupported* |
| boolean | 0x08 | boolean |
| UTC Date-Time | 0x09 | *unsupported* |
| null | 0x0A | null |
| Regular Expr. | 0x0B | *unsupported* |
| DB Pointer | 0x0C | *unsupported* |
| JavaScript Code | 0x0D | *unsupported* |
| Symbol | 0x0E | *unsupported* |
| JavaScript Code | 0x0F | *unsupported* |
| int32 | 0x10 | number_integer |
| uint64(Timestamp) | 0x11 | number_unsigned |
| 128-bit decimal float | 0x13 | *unsupported* |
| Max Key | 0x7F | *unsupported* |
| Min Key | 0xFF | *unsupported* |
| BSON type | BSON marker byte | JSON value type |
|--------------------------|------------------|-----------------|
| double | 0x01 | number_float |
| string | 0x02 | string |
| document | 0x03 | object |
| array | 0x04 | array |
| binary | 0x05 | binary |
| undefined | 0x06 | *unsupported* |
| ObjectId | 0x07 | *unsupported* |
| boolean | 0x08 | boolean |
| UTC Date-Time | 0x09 | *unsupported* |
| null | 0x0A | null |
| Regular Expr. | 0x0B | *unsupported* |
| DB Pointer | 0x0C | *unsupported* |
| JavaScript Code | 0x0D | *unsupported* |
| Symbol | 0x0E | *unsupported* |
| JavaScript Code w/ scope | 0x0F | *unsupported* |
| int32 | 0x10 | number_integer |
| uint64(Timestamp) | 0x11 | number_unsigned |
| int64 | 0x12 | number_integer |
| 128-bit decimal float | 0x13 | *unsupported* |
| Max Key | 0x7F | *unsupported* |
| Min Key | 0xFF | *unsupported* |
!!! warning "Incomplete mapping"
@@ -5,7 +5,7 @@ extremely small code sizes, fairly small message size, and extensibility without
!!! abstract "References"
- [CBOR Website](http://cbor.io) - the main source on CBOR
- [CBOR Website](http://cbor.io) - the main source on CBOR
- [CBOR Playground](http://cbor.me) - an interactive webpage to translate between JSON and CBOR
- [RFC 7049](https://tools.ietf.org/html/rfc7049) - the CBOR specification
@@ -37,22 +37,22 @@ The library uses the following mapping from JSON values types to CBOR types acco
| number_float | *any value representable by a float* | Single-Precision Float | 0xFA |
| number_float | *any value NOT representable by a float* | Double-Precision Float | 0xFB |
| string | *length*: 0..23 | UTF-8 string | 0x60..0x77 |
| string | *length*: 23..255 | UTF-8 string (1 byte follow) | 0x78 |
| string | *length*: 24..255 | UTF-8 string (1 byte follow) | 0x78 |
| string | *length*: 256..65535 | UTF-8 string (2 bytes follow) | 0x79 |
| string | *length*: 65536..4294967295 | UTF-8 string (4 bytes follow) | 0x7A |
| string | *length*: 4294967296..18446744073709551615 | UTF-8 string (8 bytes follow) | 0x7B |
| array | *size*: 0..23 | array | 0x80..0x97 |
| array | *size*: 23..255 | array (1 byte follow) | 0x98 |
| array | *size*: 24..255 | array (1 byte follow) | 0x98 |
| array | *size*: 256..65535 | array (2 bytes follow) | 0x99 |
| array | *size*: 65536..4294967295 | array (4 bytes follow) | 0x9A |
| array | *size*: 4294967296..18446744073709551615 | array (8 bytes follow) | 0x9B |
| object | *size*: 0..23 | map | 0xA0..0xB7 |
| object | *size*: 23..255 | map (1 byte follow) | 0xB8 |
| object | *size*: 24..255 | map (1 byte follow) | 0xB8 |
| object | *size*: 256..65535 | map (2 bytes follow) | 0xB9 |
| object | *size*: 65536..4294967295 | map (4 bytes follow) | 0xBA |
| object | *size*: 4294967296..18446744073709551615 | map (8 bytes follow) | 0xBB |
| binary | *size*: 0..23 | byte string | 0x40..0x57 |
| binary | *size*: 23..255 | byte string (1 byte follow) | 0x58 |
| binary | *size*: 24..255 | byte string (1 byte follow) | 0x58 |
| binary | *size*: 256..65535 | byte string (2 bytes follow) | 0x59 |
| binary | *size*: 65536..4294967295 | byte string (4 bytes follow) | 0x5A |
| binary | *size*: 4294967296..18446744073709551615 | byte string (8 bytes follow) | 0x5B |
@@ -41,7 +41,7 @@ See [binary values](../binary_values.md) for more information.
|--------------------|-------------|--------------|-------------------|---------------|
| BJData | 53.2 % | 91.1 % | 78.1 % | 96.6 % |
| BJData (size) | 58.6 % | 92.1 % | 86.7 % | 97.4 % |
| BJData (size+tyoe) | 58.6 % | 92.1 % | 86.5 % | 97.4 % |
| BJData (size+type) | 58.6 % | 92.1 % | 86.5 % | 97.4 % |
| BSON | 85.8 % | 95.2 % | 95.8 % | 106.7 % |
| CBOR | 50.5 % | 86.3 % | 68.4 % | 88.0 % |
| MessagePack | 50.5 % | 86.0 % | 68.5 % | 87.9 % |