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#![cfg_attr(feature = "without-std", no_std)]
#![cfg_attr(feature = "strict", deny(warnings))]
#[macro_use]
extern crate runtime_support;
/// The hash of an ECDSA pub key which is used to identify an external transactor.
pub type AccountID = [u8; 32];
/// The ECDSA pub key of an authority. This is what the external environment/consensus algorithm
/// refers to as a "authority".
pub type SessionKey = AccountID;
pub type Balance = u64;
pub type ChainID = u64;
pub type Hash = [u8; 32];
pub type BlockNumber = u64;
pub type Timestamp = u64;
pub type TxOrder = u64;
/// The functions that a transaction can call (and be dispatched to).
#[cfg_attr(test, derive(PartialEq, Debug))]
#[derive(Clone, Copy)]
impl Function {
fn from_u8(value: u8) -> Option<Function> {
match value {
x if x == Function::StakingStake as u8 => Some(Function::StakingStake),
x if x == Function::StakingUnstake as u8 => Some(Function::StakingUnstake),
x if x == Function::StakingTransferStake as u8 => Some(Function::StakingTransferStake),
x if x == Function::ConsensusSetSessionKey as u8 => Some(Function::ConsensusSetSessionKey),
_ => None,
}
}
}
struct StreamReader<'a> {
data: &'a[u8],
offset: usize,
}
impl<'a> StreamReader<'a> {
fn new(data: &'a[u8]) -> Self {
StreamReader {
data: data,
offset: 0,
}
}
fn read<T: Slicable>(&mut self) -> Option<T> {
let size = T::size_of(&self.data[self.offset..])?;
let new_offset = self.offset + size;
let slice = &self.data[self.offset..new_offset];
self.offset = new_offset;
Slicable::from_slice(slice)
}
}
/*
// Not in use yet
// TODO: introduce fn size_will_be(&self) -> usize; to Slicable trait and implement
struct StreamWriter<'a> {
data: &'a mut[u8],
offset: usize,
}
impl<'a> StreamWriter<'a> {
fn new(data: &'a mut[u8]) -> Self {
StreamWriter {
data: data,
offset: 0,
}
}
fn write<T: Slicable>(&mut self, value: &T) -> bool {
value.as_slice_then(|s| {
let new_offset = self.offset + s.len();
if self.data.len() <= new_offset {
self.offset = new_offset;
slice.copy_from_slice(s);
true
} else {
false
}
})
}
}
trait Joiner {
fn join<T: Slicable + Sized>(self, value: &T) -> Self;
}
impl Joiner for Vec<u8> {
fn join<T: Slicable + Sized>(mut self, value: &T) -> Vec<u8> {
value.as_slice_then(|s| self.extend_from_slice(s));
self
}
}
impl Function {
/// Dispatch the function.
pub fn dispatch(&self, transactor: &AccountID, data: &[u8]) {
let mut params = StreamReader::new(data);
match *self {
Function::StakingStake => {
staking::stake(transactor);
}
Function::StakingUnstake => {
staking::unstake(transactor);
}
let dest = params.read().unwrap();
let value = params.read().unwrap();
staking::transfer_stake(transactor, &dest, value);
}
let session = params.read().unwrap();
consensus::set_session_key(transactor, &session);
pub struct Digest {
pub logs: Vec<Vec<u8>>,
pub struct Header {
pub parent_hash: Hash,
pub number: BlockNumber,
pub state_root: Hash,
pub transaction_root: Hash,
pub digest: Digest,
pub function: Function,
pub input_data: Vec<u8>,
pub nonce: TxOrder,
pub struct Block {
pub header: Header,
pub transactions: Vec<Transaction>,
}
impl Header {
pub fn from_rlp(_rlp: &[u8]) -> Self {
unimplemented!()
}
}
impl Transaction {
pub fn from_rlp(_rlp: &[u8]) -> Self {
unimplemented!()
}
}
impl Block {
pub fn from_rlp(_rlp: &[u8]) -> Self {
unimplemented!()
}
}
#[derive(Default)]
struct Environment {
fn with_env<T, F: FnOnce(&mut Environment) -> T>(f: F) -> T {
let e = env();
let mut eb = e.borrow_mut();
f(&mut *eb)
}
static mut SINGLETON: *const Rc<RefCell<Environment>> = 0 as *const Rc<RefCell<Environment>>;
if SINGLETON == 0 as *const Rc<RefCell<Environment>> {
let singleton: Rc<RefCell<Environment>> = Rc::new(RefCell::new(Default::default()));
// Put it in the heap so it can outlive this call
// Now we give out a copy of the data that is safe to use concurrently.
(*SINGLETON).clone()
}
}
trait EndianSensitive: Sized {
fn to_le(self) -> Self { self }
fn to_be(self) -> Self { self }
fn from_le(self) -> Self { self }
fn from_be(self) -> Self { self }
fn as_be_then<T, F: FnOnce(&Self) -> T>(&self, f: F) -> T { f(&self) }
fn as_le_then<T, F: FnOnce(&Self) -> T>(&self, f: F) -> T { f(&self) }
}
macro_rules! impl_endians {
( $( $t:ty ),* ) => { $(
impl EndianSensitive for $t {
fn to_le(self) -> Self { <$t>::to_le(self) }
fn to_be(self) -> Self { <$t>::to_be(self) }
fn from_le(self) -> Self { <$t>::from_le(self) }
fn from_be(self) -> Self { <$t>::from_be(self) }
fn as_be_then<T, F: FnOnce(&Self) -> T>(&self, f: F) -> T { let d = self.to_be(); f(&d) }
fn as_le_then<T, F: FnOnce(&Self) -> T>(&self, f: F) -> T { let d = self.to_le(); f(&d) }
}
)* }
}
macro_rules! impl_non_endians {
( $( $t:ty ),* ) => { $(
impl EndianSensitive for $t {}
)* }
}
impl_endians!(u16, u32, u64, usize, i16, i32, i64, isize);
impl_non_endians!(u8, i8, [u8; 20], [u8; 32]);
trait Storage {
fn storage_into(key: &[u8]) -> Self;
impl<T: Default + Sized + EndianSensitive> Storage for T {
Slicable::set_as_slice(|out| runtime_support::read_storage(key, out) == out.len())
fn store(&self, key: &[u8]) {
self.as_slice_then(|slice| runtime_support::set_storage(key, slice));
}
}
fn storage_into<T: Storage>(key: &[u8]) -> T {
T::storage_into(key)
}
/// Trait that allows zero-copy read/write of value-references to/from slices in LE format.
trait Slicable: Sized {
fn from_slice(value: &[u8]) -> Option<Self> {
Self::set_as_slice(|out| if value.len() == out.len() {
out.copy_from_slice(&value);
true
} else {
false
})
}
fn to_vec(&self) -> Vec<u8> {
self.as_slice_then(|s| s.to_vec())
}
fn set_as_slice<F: FnOnce(&mut[u8]) -> bool>(set_slice: F) -> Option<Self>;
fn as_slice_then<R, F: FnOnce(&[u8]) -> R>(&self, f: F) -> R {
f(&self.to_vec())
}
impl<T: EndianSensitive> Slicable for T {
fn set_as_slice<F: FnOnce(&mut[u8]) -> bool>(fill_slice: F) -> Option<Self> {
let mut result: T = unsafe { std::mem::uninitialized() };
let result_slice = unsafe {
std::slice::from_raw_parts_mut(transmute::<*mut T, *mut u8>(&mut result), size)
};
if fill_slice(result_slice) {
Some(result.from_le())
fn as_slice_then<R, F: FnOnce(&[u8]) -> R>(&self, f: F) -> R {
let size = size_of::<Self>();
self.as_le_then(|le| {
let value_slice = unsafe {
std::slice::from_raw_parts(transmute::<*const Self, *const u8>(le), size)
};
f(value_slice)
})
}
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fn size_of(_value: &[u8]) -> Option<usize> {
Some(size_of::<Self>())
}
}
impl Slicable for Vec<u8> {
fn from_slice(value: &[u8]) -> Option<Self> {
Some(value[4..].to_vec())
}
fn set_as_slice<F: FnOnce(&mut[u8]) -> bool>(_fill_slice: F) -> Option<Self> {
unimplemented!();
}
fn to_vec(&self) -> Vec<u8> {
let mut r = vec![].join(&(self.len() as u32));
r.extend_from_slice(&self);
r
}
fn size_of(data: &[u8]) -> Option<usize> {
u32::from_slice(&data[0..4]).map(|i| (i + 4) as usize)
}
}
impl Slicable for Transaction {
fn from_slice(value: &[u8]) -> Option<Self> {
let mut reader = StreamReader::new(value);
Some(Transaction {
signed: reader.read()?,
function: Function::from_u8(reader.read()?)?,
nonce: reader.read()?,
input_data: reader.read()?,
})
}
fn set_as_slice<F: FnOnce(&mut[u8]) -> bool>(_fill_slice: F) -> Option<Self> {
unimplemented!();
}
fn to_vec(&self) -> Vec<u8> {
vec![]
.join(&self.signed)
.join(&(self.function as u8))
.join(&self.nonce)
.join(&self.input_data)
}
fn size_of(data: &[u8]) -> Option<usize> {
let first_part = size_of::<AccountID>() + size_of::<u8>() + size_of::<TxOrder>();
let second_part = <Vec<u8>>::size_of(&data[first_part..])?;
Some(first_part + second_part)
}
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impl NonTrivialSlicable for Transaction {}
impl<T: Slicable> NonTrivialSlicable for Vec<T> where Vec<T>: Slicable {}
impl<T: NonTrivialSlicable> Slicable for Vec<T> {
fn from_slice(value: &[u8]) -> Option<Self> {
let len = Self::size_of(&value[0..4])?;
let mut off = 4;
let mut r = vec![];
while off < len {
let element_len = T::size_of(&value[off..])?;
r.push(T::from_slice(&value[off..off + element_len])?);
off += element_len;
}
Some(r)
}
fn set_as_slice<F: FnOnce(&mut[u8]) -> bool>(_fill_slice: F) -> Option<Self> {
unimplemented!();
}
fn to_vec(&self) -> Vec<u8> {
let vecs = self.iter().map(Slicable::to_vec).collect::<Vec<_>>();
let len = vecs.iter().fold(0, |mut a, v| {a += v.len(); a});
let mut r = vec![].join(&(len as u32));
vecs.iter().for_each(|v| r.extend_from_slice(v));
r
}
fn size_of(data: &[u8]) -> Option<usize> {
u32::from_slice(&data[0..4]).map(|i| (i + 4) as usize)
}
}
impl Slicable for Header {
fn from_slice(value: &[u8]) -> Option<Self> {
let mut reader = StreamReader::new(value);
Some(Header {
parent_hash: reader.read()?,
number: reader.read()?,
state_root: reader.read()?,
transaction_root: reader.read()?,
digest: Digest { logs: reader.read()?, },
})
}
fn set_as_slice<F: FnOnce(&mut[u8]) -> bool>(_fill_slice: F) -> Option<Self> {
unimplemented!();
}
fn to_vec(&self) -> Vec<u8> {
vec![]
.join(&self.parent_hash)
.join(&self.number)
.join(&self.state_root)
.join(&self.transaction_root)
.join(&self.digest.logs)
}
fn size_of(data: &[u8]) -> Option<usize> {
let first_part = size_of::<Hash>() + size_of::<BlockNumber>() + size_of::<Hash>() + size_of::<Hash>();
let second_part = <Vec<Vec<u8>>>::size_of(&data[first_part..])?;
Some(first_part + second_part)
}
}
trait KeyedVec {
fn to_keyed_vec(&self, prepend_key: &[u8]) -> Vec<u8>;
}
impl KeyedVec for AccountID {
fn to_keyed_vec(&self, prepend_key: &[u8]) -> Vec<u8> {
let mut r = prepend_key.to_vec();
r.extend_from_slice(self);
r
}
}
macro_rules! impl_endians {
( $( $t:ty ),* ) => { $(
impl KeyedVec for $t {
fn to_keyed_vec(&self, prepend_key: &[u8]) -> Vec<u8> {
self.as_slice_then(|slice| {
let mut r = prepend_key.to_vec();
r.extend_from_slice(slice);
r
})
}
}
)* }
}
impl_endians!(u16, u32, u64, usize, i16, i32, i64, isize);
// TODO: add keccak256 (or some better hashing scheme) & ECDSA-recover (or some better sig scheme)
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pub fn execute_block(_input: Vec<u8>) -> Vec<u8> {
let block = Block::from_rlp(&_input);
environment::execute_block(&block)
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pub fn execute_transaction(_input: Vec<u8>) -> Vec<u8> {
environment::execute_transaction(&tx)
}
impl_stubs!(execute_block, execute_transaction);
/// The current relay chain identifier.
// TODO: retrieve from external
unimplemented!()
}
/// The current block number being processed. Set by `execute_block`.
pub fn block_number() -> BlockNumber {
with_env(|e| e.block_number)
}
/// Get the block hash of a given block.
pub fn block_hash(_number: BlockNumber) -> Hash {
unimplemented!()
}
with_env(|e| e.block_number = _block.header.number);
// TODO: go through each transaction and use execute_transaction to execute.
// TODO: ensure digest in header is what we expect from transactions.
pub fn execute_transaction(_tx: &Transaction) -> Vec<u8> {
// TODO: decode data and ensure valid
// TODO: ensure signature valid and recover id (use authentication::authenticate)
// TODO: ensure target_function valid
// TODO: decode parameters
_tx.function.dispatch(&_tx.signed, &_tx.input_data);
// TODO: encode any return
Vec::new()
}
/// Set the new code.
pub fn set_code(new: &[u8]) {
/// Set the light-client digest for the header.
pub fn set_digest(_preserialised_rlp_digest: &[u8]) {
// TODO: Mention this to the external environment?
unimplemented!()
}
pub fn set_authority(index: u32, authority: AccountID) {
authority.store(&index.to_keyed_vec(b"con\0aut\0"));
storage_into(&index.to_keyed_vec(b"con\0aut\0"))
(count..authority_count()).for_each(|i| set_authority(i, SessionKey::default()));
count.store(b"con\0aut\0len");
storage_into(b"con\0aut\0len")
}
/// Get the current set of authorities. These are the session keys.
pub fn authorities() -> Vec<AccountID> {
(0..authority_count()).into_iter().map(authority).collect()
/// Set the current set of authorities' session keys.
///
/// Called by `next_session` only.
pub fn set_authorities(authorities: &[AccountID]) {
set_authority_count(authorities.len() as u32);
authorities.iter().enumerate().for_each(|(v, &i)| set_authority(v as u32, i));
/// Get the current set of validators. These are the long-term identifiers for the validators
/// and will be mapped to a session key with the most recent `set_next_session_key`.
pub fn validators() -> Vec<AccountID> {
unimplemented!()
}
/// Set the current set of validators.
///
/// Called by staking::next_era() only.
pub fn set_validators(_new: &[AccountID]) {
unimplemented!()
}
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/// The number of blocks in each session.
pub fn session_length() -> BlockNumber {
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}
/// Sets the session key of `_transactor` to `_session`. This doesn't take effect until the next
pub fn set_session_key(_transactor: &AccountID, _session: &AccountID) {
unimplemented!()
}
/// Move onto next session: register the new authority set.
pub fn next_session() {
// TODO: Call set_authorities().
unimplemented!()
}
/// Hook to be called prior to transaction processing.
pub fn pre_transactions() {}
/// Hook to be called after to transaction processing.
pub fn post_transactions() {
// TODO: check block number and call next_session if necessary.
}
/// The length of a staking era in blocks.
pub fn era_length() -> BlockNumber {
sessions_per_era() * consensus::session_length()
}
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/// The length of a staking era in sessions.
/// The era has changed - enact new staking set.
///
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/// NOTE: This always happens on a session change.
/// The balance of a given account.
pub fn balance(who: &AccountID) -> Balance {
storage_into(&who.to_keyed_vec(b"sta\0bal\0"))
}
/// Transfer some unlocked staking balance to another staker.
pub fn transfer_stake(transactor: &AccountID, dest: &AccountID, value: Balance) {
let from_key = transactor.to_keyed_vec(b"sta\0bal\0");
let from_balance: Balance = storage_into(&from_key);
assert!(from_balance >= value);
let to_key = dest.to_keyed_vec(b"sta\0bal\0");
let to_balance: Balance = storage_into(&to_key);
assert!(to_balance + value > to_balance); // no overflow
(from_balance - value).store(&from_key);
(to_balance + value).store(&to_key);
}
///
/// Effects will be felt at the beginning of the next era.
pub fn stake(_transactor: &AccountID) {
unimplemented!()
}
///
/// Effects will be felt at the beginning of the next era.
pub fn unstake(_transactor: &AccountID) {
unimplemented!()
}
/// Hook to be called prior to transaction processing.
pub fn pre_transactions() {
/// Hook to be called after to transaction processing.
pub fn post_transactions() {
// TODO: check block number and call next_era if necessary.
pub fn validate_signature(_tx: Transaction) -> ( AccountID, TxOrder ) {
unimplemented!()
}
pub fn nonce(_id: AccountID) -> TxOrder {
unimplemented!()
}
pub fn authenticate(_tx: Transaction) -> AccountID {
unimplemented!()
}
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pub fn timestamp() -> Timestamp {
unimplemented!()
}
pub fn set_timestamp(_now: Timestamp) {
unimplemented!()
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::collections::HashMap;
use runtime_support::{NoError, with_externalities, Externalities};
#[derive(Debug, Default)]
struct TestExternalities {
storage: HashMap<Vec<u8>, Vec<u8>>,
}
impl Externalities for TestExternalities {
type Error = NoError;
fn storage(&self, key: &[u8]) -> Result<&[u8], NoError> {
Ok(self.storage.get(&key.to_vec()).map_or(&[] as &[u8], Vec::as_slice))
}
fn set_storage(&mut self, key: Vec<u8>, value: Vec<u8>) {
self.storage.insert(key, value);
}
}
macro_rules! map {
($( $name:expr => $value:expr ),*) => (
vec![ $( ( $name, $value ) ),* ].into_iter().collect()
)
}
#[test]
fn staking_balance_works() {
let one: AccountID = [1u8; 32];
let two: AccountID = [2u8; 32];
let mut t = TestExternalities { storage: map![
{ let mut r = b"sta\0bal\0".to_vec(); r.extend_from_slice(&one); r } => vec![42u8, 0, 0, 0, 0, 0, 0, 0]
], };
with_externalities(&mut t, || {
assert_eq!(staking::balance(&one), 42);
assert_eq!(staking::balance(&two), 0);
});
}
#[test]
fn staking_balance_transfer_works() {
let one: AccountID = [1u8; 32];
let two: AccountID = [2u8; 32];
let mut t = TestExternalities { storage: map![
{ let mut r = b"sta\0bal\0".to_vec(); r.extend_from_slice(&one); r } => vec![111u8, 0, 0, 0, 0, 0, 0, 0]
], };
with_externalities(&mut t, || {
staking::transfer_stake(&one, &two, 69);
assert_eq!(staking::balance(&one), 42);
assert_eq!(staking::balance(&two), 69);
});
}
#[test]
fn staking_balance_transfer_dispatch_works() {
let one: AccountID = [1u8; 32];
let two: AccountID = [2u8; 32];
let mut t = TestExternalities { storage: map![
{ let mut r = b"sta\0bal\0".to_vec(); r.extend_from_slice(&one); r } => vec![111u8, 0, 0, 0, 0, 0, 0, 0]
], };
let tx = Transaction {
signed: one.clone(),
function: Function::StakingTransferStake,
input_data: vec![].join(&two).join(&69u64),
nonce: 0,
};
with_externalities(&mut t, || {
environment::execute_transaction(&tx);
assert_eq!(staking::balance(&one), 42);
assert_eq!(staking::balance(&two), 69);
});
}
#[test]
fn serialise_transaction_works() {
let one: AccountID = [1u8; 32];
let two: AccountID = [2u8; 32];
let tx = Transaction {
signed: one.clone(),
function: Function::StakingTransferStake,
input_data: vec![].join(&two).join(&69u64),
assert_eq!(serialised, vec![
1u8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2,
69, 0, 0, 0, 0, 0, 0, 0,
40, 0, 0, 0,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
69, 0, 0, 0, 0, 0, 0, 0
]);
}
#[test]
fn deserialise_transaction_works() {
let one: AccountID = [1u8; 32];
let two: AccountID = [2u8; 32];
let tx = Transaction {
signed: one.clone(),
function: Function::StakingTransferStake,
input_data: vec![].join(&two).join(&69u64),
let data = [
1u8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2,
69, 0, 0, 0, 0, 0, 0, 0,
40, 0, 0, 0,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
69, 0, 0, 0, 0, 0, 0, 0
];
let deserialised = Transaction::from_slice(&data).unwrap();
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#[test]
fn serialise_header_works() {
let h = Header {
parent_hash: [4u8; 32],
number: 42,
state_root: [5u8; 32],
transaction_root: [6u8; 32],
digest: Digest { logs: vec![ b"one log".to_vec(), b"another log".to_vec() ], },
};
let serialised = h.to_vec();
assert_eq!(serialised, vec![
4u8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
42, 0, 0, 0, 0, 0, 0, 0,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
26, 0, 0, 0,
7, 0, 0, 0,
111, 110, 101, 32, 108, 111, 103,
11, 0, 0, 0,
97, 110, 111, 116, 104, 101, 114, 32, 108, 111, 103
]);
}
#[test]
fn deserialise_header_works() {
let h = Header {
parent_hash: [4u8; 32],
number: 42,
state_root: [5u8; 32],
transaction_root: [6u8; 32],
digest: Digest { logs: vec![ b"one log".to_vec(), b"another log".to_vec() ], },
};
let data = [
4u8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
42, 0, 0, 0, 0, 0, 0, 0,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
26, 0, 0, 0,
7, 0, 0, 0,
111, 110, 101, 32, 108, 111, 103,
11, 0, 0, 0,
97, 110, 111, 116, 104, 101, 114, 32, 108, 111, 103
];
let deserialised = Header::from_slice(&data).unwrap();
assert_eq!(deserialised, h);
}