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extern crate hash_db;
extern crate keccak_hasher;
use hash_db::Hasher;
use keccak_hasher::KeccakHasher;
type H256 = <KeccakHasher as hash_db::Hasher>::Out;
pub enum Alphabet {
All,
Low,
Mid,
Custom(Vec<u8>),
}
pub enum ValueMode {
Mirror,
Random,
Index,
}
pub struct StandardMap {
pub alphabet: Alphabet,
pub min_key: usize,
pub journal_key: usize,
pub value_mode: ValueMode,
pub count: u32,
}
impl StandardMap {
fn random_bytes(min_count: usize, journal_count: usize, seed: &mut H256) -> Vec<u8> {
assert!(min_count + journal_count <= 32);
*seed = KeccakHasher::hash(&seed[..]);
let r = min_count + (seed[31] as usize % (journal_count + 1));
seed[0..r].to_vec()
}
fn random_value(seed: &mut H256) -> Vec<u8> {
*seed = KeccakHasher::hash(&seed[..]);
match seed[0] % 2 {
1 => vec![seed[31];1],
_ => seed.to_vec(),
}
}
fn random_word(alphabet: &[u8], min_count: usize, journal_count: usize, seed: &mut H256) -> Vec<u8> {
assert!(min_count + journal_count <= 32);
*seed = KeccakHasher::hash(&seed[..]);
let r = min_count + (seed[31] as usize % (journal_count + 1));
let mut ret: Vec<u8> = Vec::with_capacity(r);
for i in 0..r {
ret.push(alphabet[seed[i] as usize % alphabet.len()]);
}
ret
}
pub fn make(&self) -> Vec<(Vec<u8>, Vec<u8>)> {
self.make_with(&mut H256::default())
}
pub fn make_with(&self, seed: &mut H256) -> Vec<(Vec<u8>, Vec<u8>)> {
let low = b"abcdef";
let mid = b"@QWERTYUIOPASDFGHJKLZXCVBNM[/]^_";
let mut d: Vec<(Vec<u8>, Vec<u8>)> = Vec::new();
for index in 0..self.count {
let k = match self.alphabet {
Alphabet::All => Self::random_bytes(self.min_key, self.journal_key, seed),
Alphabet::Low => Self::random_word(low, self.min_key, self.journal_key, seed),
Alphabet::Mid => Self::random_word(mid, self.min_key, self.journal_key, seed),
Alphabet::Custom(ref a) => Self::random_word(a, self.min_key, self.journal_key, seed),
};
let v = match self.value_mode {
ValueMode::Mirror => k.clone(),
ValueMode::Random => Self::random_value(seed),
ValueMode::Index => vec![index as u8, (index >> 8) as u8, (index >> 16) as u8, (index >> 24) as u8],
};
d.push((k, v))
}
d
}
}