Multicodec（多编码）

let package = Package(
    ...
    dependencies: [
        ...
        .package(url: "https://github.com/swift-libp2p/swift-multicodec.git", .from("0.0.1"))
    ],
    ...
    .target(
        name: "...",
        dependencies: [
            ...
            .product(name: "Multicodec", package: "swift-multicodec"),
        ]),
)

import Multicodec

let prefixedProtobuf = addPrefix(.protobuf, protobuf)
// prefixedProtobuf 0x50...

// The multicodec codec values can be accessed directly:
print(Codecs.DAG_CBOR.code) //113

// To get the string representation and description of a codec (e.g. for error messages):
print(Codecs(113).name)        // dag-cbor
print(Codecs(113).description) // optional("MerkleDAG cbor")