Files
kramer/src/recovery.rs
2025-12-29 11:02:13 -05:00

152 lines
4.1 KiB
Rust

use std::fs::{File, OpenOptions};
use std::io::{BufWriter, Read, Seek, SeekFrom, Write};
use std::ptr::read;
use crate::mapping::{Cluster, Domain, MapFile, Stage};
use crate::Args;
#[derive(Debug)]
#[allow(dead_code)]
pub struct Recover {
/// Buffer capacity in bytes.
buf_capacity: u64,
config: Args,
input: File,
output: BufWriter<File>,
map: MapFile,
stage: Stage,
}
impl Recover {
pub fn new(config: Args, input: File, output: File, map: MapFile, buf_capacity: u64) -> Self {
let stage = map.get_stage();
let mut r = Recover {
buf_capacity,
config,
input: input,
output: BufWriter::with_capacity(buf_capacity as usize, output),
map,
stage: stage,
};
// Ensure that buffer capacity is adjusted based on progress.
r.set_buf_capacity();
r
}
/// Recover media.
pub fn run(&mut self) -> () {
self.copy_untested();
/*
let mut is_finished = false;
while !is_finished {
match self.map.get_stage() {
Stage::Untested => {
self.copy_untested();
}
Stage::ForIsolation(level) => {
self.copy_isolate(level);
}
Stage::Damaged => {
println!("Cannot recover further.");
is_finished = true
}
}
}
*/
// return recovered_bytes
}
/// Attempt to copy all untested blocks.
fn copy_untested(&mut self) -> &mut Self {
let mut buf = vec![crate::FB_PAD_VALUE; self.buf_capacity as usize];
// Purely caching.
let mut read_position = 0_u64;
let last_read_position = crate::io::get_stream_length(&mut self.input)
.expect("Failed to get length of input stream")
- self.buf_capacity;
while read_position < last_read_position {
dbg!(read_position);
if let Err(err) = self.input.read_exact(&mut buf) {
println!("Hit error: {:?}", err);
self.input
.seek_relative(self.buf_capacity as i64)
.expect("Failed to seek input by buf_capacity to skip previous error");
} else {
self.output
.write_all(buf.as_slice())
.expect("Failed to write data to output file");
self.map.update(Cluster {
domain: Domain {
start: read_position as usize,
end: (read_position + self.buf_capacity) as usize,
},
stage: Stage::Intact,
});
}
read_position += self.buf_capacity;
}
crate::mapping::map::write_map_to_file(
OpenOptions::new()
.create(true)
.write(true)
.open(crate::get_path(
&self.config.map,
self.config.input.to_str().unwrap(),
"map",
))
.expect("Failed to open map file"),
&self.map,
)
.expect("Failed to write map file");
/*
let mut untested: Vec<Cluster> = vec![];
for cluster in self.map.get_clusters(Stage::Untested).iter_mut() {
untested.append(&mut cluster.subdivide(self.map.sector_size as usize));
}
todo!("Read and save data.");
*/
self
}
/// Attempt to copy blocks via isolation at pass level.
fn copy_isolate(&mut self, level: u8) -> &mut Self {
todo!();
self
}
/// Set buffer capacities as cluster length in bytes.
/// Varies depending on the recovery stage.
fn set_buf_capacity(&mut self) -> &mut Self {
self.buf_capacity = self.config.sector_size as u64 * self.config.cluster_length as u64;
self
}
}
#[cfg(test)]
#[allow(unused)]
mod tests {
use super::*;
// Test for Recover::set_buf_capacity
}