53 releases (24 breaking)
0.25.1 | Sep 12, 2024 |
---|---|
0.24.4 | Sep 4, 2024 |
0.24.2 | Jun 28, 2024 |
0.21.1 | Mar 28, 2024 |
0.1.1 | Mar 29, 2020 |
#60 in Encoding
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Used in 255 crates
(79 directly)
195KB
4.5K
SLoC
minicbor
A small CBOR codec suitable for no_std
environments.
Documentation
Documentation is available at https://docs.rs/minicbor/
License
This software is licensed under the Blue Oak Model License Version 1.0.0. If you are interested in contributing to this project, please read the file CONTRIBUTING.md first.
lib.rs
:
A small CBOR codec suitable for no_std
environments.
The crate is organised around the following entities:
-
Encoder
andDecoder
for type-directed encoding and decoding of values. -
Encode
andDecode
traits which can be implemented for any type that should be encoded to or decoded from CBOR. They are similar to serde'sSerialize
andDeserialize
traits but do not abstract over the encoder/decoder.
Encoding and decoding proceeds in a type-directed way, i.e. by calling
methods for expected data item types, e.g. Decoder::u32
or
Encoder::str
. In addition there is support for data type inspection.
The Decoder
can be queried for the current data type which returns a
data::Type
that can represent every possible CBOR type and decoding
can thus proceed based on this information. It is also possible to just
tokenize the input bytes using a Tokenizer
, i.e.
an Iterator
over CBOR Token
s. Finally, the length
in bytes of a value's CBOR representation can be calculated if the
value's type implements the CborLen
trait.
Optionally, Encode
and Decode
can be derived for structs and enums
using the respective derive macros (requires feature "derive"
).
See minicbor_derive
for details.
For I/O support see minicbor-io
.
Support for serde is available in minicbor-serde
.
Feature flags
The following feature flags are supported:
-
"alloc"
: Enables most collection types in ano_std
environment. -
"std"
: Implies"alloc"
and enables more functionality that depends on thestd
crate.
Example: generic encoding and decoding
use minicbor::{Encode, Decode};
let input = ["hello", "world"];
let mut buffer = [0u8; 128];
minicbor::encode(&input, buffer.as_mut())?;
let output: [&str; 2] = minicbor::decode(buffer.as_ref())?;
assert_eq!(input, output);
Example: ad-hoc encoding
use minicbor::Encoder;
let mut buffer = [0u8; 128];
let mut encoder = Encoder::new(&mut buffer[..]);
encoder.begin_map()? // using an indefinite map here
.str("hello")?.str("world")?
.str("submap")?.map(2)?
.u8(1)?.bool(true)?
.u8(2)?.bool(false)?
.u16(34234)?.array(3)?.u8(1)?.u8(2)?.u8(3)?
.bool(true)?.null()?
.end()?;
Example: ad-hoc decoding
use minicbor::Decoder;
use minicbor::data::IanaTag;
let input = [
0xc0, 0x74, 0x32, 0x30, 0x31, 0x33, 0x2d, 0x30,
0x33, 0x2d, 0x32, 0x31, 0x54, 0x32, 0x30, 0x3a,
0x30, 0x34, 0x3a, 0x30, 0x30, 0x5a
];
let mut decoder = Decoder::new(&input);
assert_eq!(IanaTag::DateTime.tag(), decoder.tag()?);
assert_eq!("2013-03-21T20:04:00Z", decoder.str()?);
Example: tokenization
use minicbor::display;
use minicbor::{Encoder, Decoder};
use minicbor::data::Token;
let input = [0x83, 0x01, 0x9f, 0x02, 0x03, 0xff, 0x82, 0x04, 0x05];
assert_eq!("[1, [_ 2, 3], [4, 5]]", format!("{}", display(&input)));
let tokens = Decoder::new(&input).tokens().collect::<Result<Vec<Token>, _>>()?;
assert_eq! { &tokens[..],
&[Token::Array(3),
Token::U8(1),
Token::BeginArray,
Token::U8(2),
Token::U8(3),
Token::Break,
Token::Array(2),
Token::U8(4),
Token::U8(5)]
};
let mut buffer = [0u8; 9];
Encoder::new(buffer.as_mut()).tokens(&tokens)?;
assert_eq!(input, buffer);
Dependencies
~170KB