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use crate::rate::EncoderWork;
pub struct EncoderResult<'a> {
work: &'a mut EncoderWork,
}
impl<'a> EncoderResult<'a> {
pub fn recovery(&self, index: usize) -> Option<&[u8]> {
self.work.recovery(index)
}
pub fn recovery_iter(&self) -> Recovery {
Recovery::new(self.work)
}
}
impl<'a> EncoderResult<'a> {
pub(crate) fn new(work: &'a mut EncoderWork) -> Self {
Self { work }
}
}
impl<'a> Drop for EncoderResult<'a> {
fn drop(&mut self) {
self.work.reset_received();
}
}
pub struct Recovery<'a> {
ended: bool,
next_index: usize,
work: &'a EncoderWork,
}
impl<'a> Iterator for Recovery<'a> {
type Item = &'a [u8];
fn next(&mut self) -> Option<&'a [u8]> {
if self.ended {
None
} else if let Some(next) = self.work.recovery(self.next_index) {
self.next_index += 1;
Some(next)
} else {
self.ended = true;
None
}
}
}
impl<'a> Recovery<'a> {
pub(crate) fn new(work: &'a EncoderWork) -> Self {
Self {
ended: false,
next_index: 0,
work,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{test_util, ReedSolomonEncoder};
#[test]
fn encoder_result() {
let original = test_util::generate_original(2, 1024, 123);
let mut encoder = ReedSolomonEncoder::new(2, 3, 1024).unwrap();
for original in &original {
encoder.add_original_shard(original).unwrap();
}
let result: EncoderResult = encoder.encode().unwrap();
let mut all = Vec::new();
all.push(result.recovery(0).unwrap());
all.push(result.recovery(1).unwrap());
all.push(result.recovery(2).unwrap());
assert!(result.recovery(3).is_none());
test_util::assert_hash(all, test_util::LOW_2_3);
let mut iter: Recovery = result.recovery_iter();
let mut all = Vec::new();
all.push(iter.next().unwrap());
all.push(iter.next().unwrap());
all.push(iter.next().unwrap());
assert!(iter.next().is_none());
test_util::assert_hash(all, test_util::LOW_2_3);
}
}