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use azalea_buf::{BufReadError, McBufReadable, McBufWritable};
use std::io::{Read, Write};
/// Represents Java's BitSet, a list of bits.
#[derive(Debug, Clone, PartialEq, Eq, Hash, Default)]
pub struct BitSet {
data: Vec<u64>,
}
// the Index trait requires us to return a reference, but we can't do that
impl BitSet {
pub fn new(size: usize) -> Self {
BitSet {
data: vec![0; size.div_ceil(64)],
}
}
pub fn index(&self, index: usize) -> bool {
(self.data[index / 64] & (1u64 << (index % 64))) != 0
}
}
impl McBufReadable for BitSet {
fn read_from(buf: &mut impl Read) -> Result<Self, BufReadError> {
Ok(Self {
data: Vec::<u64>::read_from(buf)?,
})
}
}
impl McBufWritable for BitSet {
fn write_into(&self, buf: &mut impl Write) -> Result<(), std::io::Error> {
self.data.write_into(buf)
}
}
impl BitSet {
pub fn set(&mut self, bit_index: usize) {
self.data[bit_index / 64] |= 1u64 << (bit_index % 64);
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_bitset() {
let mut bitset = BitSet::new(64);
assert_eq!(bitset.index(0), false);
assert_eq!(bitset.index(1), false);
assert_eq!(bitset.index(2), false);
bitset.set(1);
assert_eq!(bitset.index(0), false);
assert_eq!(bitset.index(1), true);
assert_eq!(bitset.index(2), false);
}
}
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