cid 0.5.0

CID in rust
Documentation 
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use std::convert::TryFrom;

use multihash::Multihash;
use quickcheck::{Arbitrary, Gen};
use rand::seq::SliceRandom;
use rand::Rng;

use crate::{Cid, Codec, Version};

const CODECS: [Codec; 18] = [
    Codec::Raw,
    Codec::DagProtobuf,
    Codec::DagCBOR,
    Codec::GitRaw,
    Codec::EthereumBlock,
    Codec::EthereumBlockList,
    Codec::EthereumTxTrie,
    Codec::EthereumTx,
    Codec::EthereumTxReceiptTrie,
    Codec::EthereumTxReceipt,
    Codec::EthereumStateTrie,
    Codec::EthereumAccountSnapshot,
    Codec::EthereumStorageTrie,
    Codec::BitcoinBlock,
    Codec::BitcoinTx,
    Codec::ZcashBlock,
    Codec::ZcashTx,
    Codec::DagJSON,
];

const POPULAR: [Codec; 4] = [
    Codec::Raw,
    Codec::DagProtobuf,
    Codec::DagCBOR,
    Codec::DagJSON,
];

impl Arbitrary for Codec {
    fn arbitrary<G: Gen>(g: &mut G) -> Self {
        // chose the most frequently used codecs more often
        if g.gen_bool(0.7) {
            *POPULAR.choose(g).unwrap()
        } else {
            *CODECS.choose(g).unwrap()
        }
    }
}

impl Arbitrary for Version {
    fn arbitrary<G: Gen>(g: &mut G) -> Self {
        let version = if g.gen_bool(0.7) { 1 } else { 0 };
        Version::try_from(version).unwrap()
    }
}

impl Arbitrary for Cid {
    fn arbitrary<G: Gen>(g: &mut G) -> Self {
        let version: Version = Arbitrary::arbitrary(g);
        if version == Version::V0 {
            let data: Vec<u8> = Arbitrary::arbitrary(g);
            let hash = multihash::Sha2_256::digest(&data);
            Cid::new_v0(hash).expect("sha2_256 is a valid hash for cid v0")
        } else {
            let codec: Codec = Arbitrary::arbitrary(g);
            let hash: Multihash = Arbitrary::arbitrary(g);
            Cid::new_v1(codec, hash)
        }
    }
}