hypercore 0.16.0

Secure, distributed, append-only log
Documentation 
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use compact_encoding::{EncodingError, FixedWidthEncoding, as_array, to_encoded_bytes};

// These the output of, see `hash_namespace` test below for how they are produced
// https://github.com/holepunchto/hypercore/blob/cf08b72f14ed7d9ef6d497ebb3071ee0ae20967e/lib/caps.js#L16
const TREE: [u8; 32] = [
    0x9F, 0xAC, 0x70, 0xB5, 0xC, 0xA1, 0x4E, 0xFC, 0x4E, 0x91, 0xC8, 0x33, 0xB2, 0x4, 0xE7, 0x5B,
    0x8B, 0x5A, 0xAD, 0x8B, 0x58, 0x81, 0xBF, 0xC0, 0xAD, 0xB5, 0xEF, 0x38, 0xA3, 0x27, 0x5B, 0x9C,
];

// const DEFAULT_NAMESPACE: [u8; 32] = [
//     0x41, 0x44, 0xEE, 0xA5, 0x31, 0xE4, 0x83, 0xD5, 0x4E, 0x0C, 0x14, 0xF4, 0xCA, 0x68, 0xE0, 0x64,
//     0x4F, 0x35, 0x53, 0x43, 0xFF, 0x6F, 0xCB, 0x0F, 0x00, 0x52, 0x00, 0xE1, 0x2C, 0xD7, 0x47, 0xCB,
// ];

// const MANIFEST: [u8; 32] = [
//     0xE6, 0x4B, 0x71, 0x08, 0xEA, 0xCC, 0xE4, 0x7C, 0xFC, 0x61, 0xAC, 0x85, 0x05, 0x68, 0xF5, 0x5F,
//     0x8B, 0x15, 0xB8, 0x2E, 0xC5, 0xED, 0x78, 0xC4, 0xEC, 0x59, 0x7B, 0x03, 0x6E, 0x2A, 0x14, 0x98,
// ];

/// Create a signable buffer for tree. This is treeSignable in Javascript.
/// See https://github.com/hypercore-protocol/hypercore/blob/70b271643c4e4b1e5ecae5bb579966dfe6361ff3/lib/caps.js#L17
pub(crate) fn signable_tree(hash: &[u8], length: u64, fork: u64) -> Box<[u8]> {
    (|| {
        Ok::<_, EncodingError>(to_encoded_bytes!(
            &TREE,
            as_array::<32>(hash)?,
            length.as_fixed_width(),
            fork.as_fixed_width()
        ))
    })()
    .expect("Encoding should not fail")
}