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extern crate bigint;
extern crate rlp;
#[cfg(test)]
extern crate hexutil;
extern crate sha3;
use std::ops::BitOr;
use bigint::H2048;
use sha3::{Digest, Keccak256};
use rlp::{Encodable, Decodable, RlpStream, DecoderError, UntrustedRlp};
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct LogsBloom(H2048);
impl From<H2048> for LogsBloom {
fn from(val: H2048) -> LogsBloom {
LogsBloom(val)
}
}
impl Into<H2048> for LogsBloom {
fn into(self) -> H2048 {
self.0
}
}
impl Encodable for LogsBloom {
fn rlp_append(&self, s: &mut RlpStream) {
self.0.rlp_append(s);
}
}
impl Decodable for LogsBloom {
fn decode(rlp: &UntrustedRlp) -> Result<Self, DecoderError> {
Ok(LogsBloom(H2048::decode(rlp)?))
}
}
impl Default for LogsBloom {
fn default() -> LogsBloom {
LogsBloom(H2048::zero())
}
}
impl BitOr for LogsBloom {
type Output = LogsBloom;
fn bitor(self, other: LogsBloom) -> LogsBloom {
LogsBloom(self.0 | other.0)
}
}
fn single_set(arr: &[u8]) -> H2048 {
let mut r = H2048::zero();
let h = Keccak256::digest(arr);
for i in [0usize, 2usize, 4usize].iter() {
let m = (((h[*i] as usize) << 8) + (h[*i + 1] as usize)) % 2048;
r[m / 8] = r[m / 8] | (1 << (m % 8));
}
r
}
impl LogsBloom {
pub fn new() -> LogsBloom {
LogsBloom::default()
}
pub fn set(&mut self, arr: &[u8]) {
self.0 = self.0 | single_set(arr);
}
pub fn check(&self, arr: &[u8]) -> bool {
let s = single_set(arr);
self.0 & s == s
}
}
#[cfg(test)]
mod tests {
use super::LogsBloom;
use bigint::H2048;
use hexutil::read_hex;
#[test]
fn test_bloom() {
let mut bloom = LogsBloom::new();
bloom.set(&read_hex("0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6").unwrap());
assert!(bloom.check(&read_hex("0f572e5295c57f15886f9b263e2f6d2d6c7b5ec6").unwrap()));
let h: H2048 = bloom.into();
for i in [1323usize, 431usize, 1319usize].iter() {
let v = 1 << (i % 8);
assert!(h[i / 8] & v == v);
}
}
}