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use libipld_base::cid;
pub use libipld_base::codec::Codec;
use libipld_base::error::BlockError;
pub use libipld_base::error::IpldError;
use libipld_base::ipld::Ipld;
use thiserror::Error;
pub mod decode;
pub mod encode;
pub use decode::ReadCbor;
pub use encode::WriteCbor;
#[derive(Clone, Debug, Hash, PartialEq, Eq)]
pub struct DagCborCodec;
impl Codec for DagCborCodec {
const VERSION: cid::Version = cid::Version::V1;
const CODEC: cid::Codec = cid::Codec::DagCBOR;
type Error = CborError;
fn encode(ipld: &Ipld) -> Result<Box<[u8]>, Self::Error> {
let mut bytes = Vec::new();
ipld.write_cbor(&mut bytes)?;
Ok(bytes.into_boxed_slice())
}
fn decode(mut data: &[u8]) -> Result<Ipld, Self::Error> {
Ipld::read_cbor(&mut data)
}
}
#[derive(Debug, Error)]
pub enum CborError {
#[error("Number larger than u64.")]
NumberOutOfRange,
#[error("Length out of range.")]
LengthOutOfRange,
#[error("Unexpected cbor code.")]
UnexpectedCode,
#[error("Unkown cbor tag.")]
UnknownTag,
#[error("Wrong key.")]
UnexpectedKey,
#[error("Unexpected end of file.")]
UnexpectedEof,
#[error("{0}")]
Io(#[from] std::io::Error),
#[error("{0}")]
Utf8(#[from] std::str::Utf8Error),
#[error("{0}")]
Cid(#[from] cid::Error),
#[error("{0}")]
Ipld(#[from] IpldError),
}
impl From<CborError> for BlockError {
fn from(err: CborError) -> Self {
Self::CodecError(err.into())
}
}
pub type CborResult<T> = Result<T, CborError>;
#[cfg(test)]
mod tests {
use super::*;
use libipld_base::cid::Cid;
use libipld_macro::ipld;
#[test]
fn test_encode_decode_cbor() {
let cid = Cid::new_v0(multihash::Sha2_256::digest(b"cid")).unwrap();
let ipld = ipld!({
"number": 1,
"list": [true, null, false],
"bytes": vec![0, 1, 2, 3],
"map": { "float": 0.0, "string": "hello" },
"link": cid,
});
let bytes = DagCborCodec::encode(&ipld).unwrap();
let ipld2 = DagCborCodec::decode(&bytes).unwrap();
assert_eq!(ipld, ipld2);
}
}