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|
||||
<span class=w> </span><span class=nt>"compact"</span><span class=p>:</span><span class=w> </span><span class=kc>true</span><span class=p>,</span>
|
||||
<span class=w> </span><span class=nt>"schema"</span><span class=p>:</span><span class=w> </span><span class=mi>0</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> </details> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="July 4, 2026 09:13:25 UTC">July 4, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - 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||||
</code></pre></div> </details> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="July 8, 2026 18:18:24 UTC">July 8, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013-2026 Niels Lohmann </div> </div> <div class=md-social> <a href="https://github.com/nlohmann" target="_blank" rel="noopener" title="github.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - 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|
||||
@@ -0,0 +1,181 @@
|
||||
# MessagePack
|
||||
|
||||
MessagePack is an efficient binary serialization format. It lets you exchange data among multiple languages like JSON. But it's faster and smaller. Small integers are encoded into a single byte, and typical short strings require only one extra byte in addition to the strings themselves.
|
||||
|
||||
References
|
||||
|
||||
- [MessagePack website](https://msgpack.org)
|
||||
- [MessagePack specification](https://github.com/msgpack/msgpack/blob/master/spec.md)
|
||||
|
||||
## Serialization
|
||||
|
||||
The library uses the following mapping from JSON values types to MessagePack types according to the MessagePack specification:
|
||||
|
||||
| JSON value type | value/range | MessagePack type | first byte |
|
||||
| --------------- | ---------------------------------------- | ---------------- | ---------- |
|
||||
| null | `null` | nil | 0xC0 |
|
||||
| boolean | `true` | true | 0xC3 |
|
||||
| boolean | `false` | false | 0xC2 |
|
||||
| number_integer | -9223372036854775808..-2147483649 | int64 | 0xD3 |
|
||||
| number_integer | -2147483648..-32769 | int32 | 0xD2 |
|
||||
| number_integer | -32768..-129 | int16 | 0xD1 |
|
||||
| number_integer | -128..-33 | int8 | 0xD0 |
|
||||
| number_integer | -32..-1 | negative fixint | 0xE0..0xFF |
|
||||
| number_integer | 0..127 | positive fixint | 0x00..0x7F |
|
||||
| number_integer | 128..255 | uint 8 | 0xCC |
|
||||
| number_integer | 256..65535 | uint 16 | 0xCD |
|
||||
| number_integer | 65536..4294967295 | uint 32 | 0xCE |
|
||||
| number_integer | 4294967296..18446744073709551615 | uint 64 | 0xCF |
|
||||
| number_unsigned | 0..127 | positive fixint | 0x00..0x7F |
|
||||
| number_unsigned | 128..255 | uint 8 | 0xCC |
|
||||
| number_unsigned | 256..65535 | uint 16 | 0xCD |
|
||||
| number_unsigned | 65536..4294967295 | uint 32 | 0xCE |
|
||||
| number_unsigned | 4294967296..18446744073709551615 | uint 64 | 0xCF |
|
||||
| number_float | *any value representable by a float* | float 32 | 0xCA |
|
||||
| number_float | *any value NOT representable by a float* | float 64 | 0xCB |
|
||||
| string | *length*: 0..31 | fixstr | 0xA0..0xBF |
|
||||
| string | *length*: 32..255 | str 8 | 0xD9 |
|
||||
| string | *length*: 256..65535 | str 16 | 0xDA |
|
||||
| string | *length*: 65536..4294967295 | str 32 | 0xDB |
|
||||
| array | *size*: 0..15 | fixarray | 0x90..0x9F |
|
||||
| array | *size*: 16..65535 | array 16 | 0xDC |
|
||||
| array | *size*: 65536..4294967295 | array 32 | 0xDD |
|
||||
| object | *size*: 0..15 | fix map | 0x80..0x8F |
|
||||
| object | *size*: 16..65535 | map 16 | 0xDE |
|
||||
| object | *size*: 65536..4294967295 | map 32 | 0xDF |
|
||||
| binary | *size*: 0..255 | bin 8 | 0xC4 |
|
||||
| binary | *size*: 256..65535 | bin 16 | 0xC5 |
|
||||
| binary | *size*: 65536..4294967295 | bin 32 | 0xC6 |
|
||||
|
||||
Complete mapping
|
||||
|
||||
The mapping is **complete** in the sense that any JSON value type can be converted to a MessagePack value.
|
||||
|
||||
Any MessagePack output created by `to_msgpack` can be successfully parsed by `from_msgpack`.
|
||||
|
||||
Size constraints
|
||||
|
||||
The following values can **not** be converted to a MessagePack value:
|
||||
|
||||
- strings with more than 4294967295 bytes
|
||||
- byte strings with more than 4294967295 bytes
|
||||
- arrays with more than 4294967295 elements
|
||||
- objects with more than 4294967295 elements
|
||||
|
||||
NaN/infinity handling
|
||||
|
||||
If NaN or Infinity are stored inside a JSON number, they are serialized properly in contrast to the [dump](https://json.nlohmann.me/api/basic_json/dump/index.md) function which serializes NaN or Infinity to `null`.
|
||||
|
||||
Example
|
||||
|
||||
```
|
||||
#include <iostream>
|
||||
#include <iomanip>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using namespace nlohmann::literals;
|
||||
|
||||
int main()
|
||||
{
|
||||
// create a JSON value
|
||||
json j = R"({"compact": true, "schema": 0})"_json;
|
||||
|
||||
// serialize it to MessagePack
|
||||
std::vector<std::uint8_t> v = json::to_msgpack(j);
|
||||
|
||||
// print the vector content
|
||||
for (auto& byte : v)
|
||||
{
|
||||
std::cout << "0x" << std::hex << std::setw(2) << std::setfill('0') << (int)byte << " ";
|
||||
}
|
||||
std::cout << std::endl;
|
||||
}
|
||||
```
|
||||
|
||||
Output:
|
||||
|
||||
```
|
||||
0x82 0xa7 0x63 0x6f 0x6d 0x70 0x61 0x63 0x74 0xc3 0xa6 0x73 0x63 0x68 0x65 0x6d 0x61 0x00
|
||||
```
|
||||
|
||||
## Deserialization
|
||||
|
||||
The library maps MessagePack types to JSON value types as follows:
|
||||
|
||||
| MessagePack type | JSON value type | first byte |
|
||||
| ---------------- | --------------- | ---------- |
|
||||
| positive fixint | number_unsigned | 0x00..0x7F |
|
||||
| fixmap | object | 0x80..0x8F |
|
||||
| fixarray | array | 0x90..0x9F |
|
||||
| fixstr | string | 0xA0..0xBF |
|
||||
| nil | `null` | 0xC0 |
|
||||
| false | `false` | 0xC2 |
|
||||
| true | `true` | 0xC3 |
|
||||
| float 32 | number_float | 0xCA |
|
||||
| float 64 | number_float | 0xCB |
|
||||
| uint 8 | number_unsigned | 0xCC |
|
||||
| uint 16 | number_unsigned | 0xCD |
|
||||
| uint 32 | number_unsigned | 0xCE |
|
||||
| uint 64 | number_unsigned | 0xCF |
|
||||
| int 8 | number_integer | 0xD0 |
|
||||
| int 16 | number_integer | 0xD1 |
|
||||
| int 32 | number_integer | 0xD2 |
|
||||
| int 64 | number_integer | 0xD3 |
|
||||
| str 8 | string | 0xD9 |
|
||||
| str 16 | string | 0xDA |
|
||||
| str 32 | string | 0xDB |
|
||||
| array 16 | array | 0xDC |
|
||||
| array 32 | array | 0xDD |
|
||||
| map 16 | object | 0xDE |
|
||||
| map 32 | object | 0xDF |
|
||||
| bin 8 | binary | 0xC4 |
|
||||
| bin 16 | binary | 0xC5 |
|
||||
| bin 32 | binary | 0xC6 |
|
||||
| ext 8 | binary | 0xC7 |
|
||||
| ext 16 | binary | 0xC8 |
|
||||
| ext 32 | binary | 0xC9 |
|
||||
| fixext 1 | binary | 0xD4 |
|
||||
| fixext 2 | binary | 0xD5 |
|
||||
| fixext 4 | binary | 0xD6 |
|
||||
| fixext 8 | binary | 0xD7 |
|
||||
| fixext 16 | binary | 0xD8 |
|
||||
| negative fixint | number_integer | 0xE0-0xFF |
|
||||
|
||||
Info
|
||||
|
||||
Any MessagePack output created by `to_msgpack` can be successfully parsed by `from_msgpack`.
|
||||
|
||||
Example
|
||||
|
||||
```
|
||||
#include <iostream>
|
||||
#include <iomanip>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
// create byte vector
|
||||
std::vector<std::uint8_t> v = {0x82, 0xa7, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x63,
|
||||
0x74, 0xc3, 0xa6, 0x73, 0x63, 0x68, 0x65, 0x6d,
|
||||
0x61, 0x00
|
||||
};
|
||||
|
||||
// deserialize it with MessagePack
|
||||
json j = json::from_msgpack(v);
|
||||
|
||||
// print the deserialized JSON value
|
||||
std::cout << std::setw(2) << j << std::endl;
|
||||
}
|
||||
```
|
||||
|
||||
Output:
|
||||
|
||||
```
|
||||
{
|
||||
"compact": true,
|
||||
"schema": 0
|
||||
}
|
||||
```
|
||||
Reference in new issue
Block a user