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use crate::random;
use std::{
fs::{File, OpenOptions},
io::{Read, Seek, SeekFrom, Write},
path::Path,
};
pub fn corrupt(bs: &mut [u8]) {
if bs.is_empty() {
return;
}
loop {
let i = random::usize(bs.len());
let b = bs[i];
bs[i] = random::random();
if b != bs[i] && random::coinflip() {
break;
}
}
}
fn seek_to_beginning(f: &mut File) {
f.seek(SeekFrom::Start(0)).unwrap();
}
pub fn corrupt_file(f: &mut File) {
seek_to_beginning(f);
let mut bs = Vec::new();
f.read_to_end(&mut bs).unwrap();
corrupt(&mut bs);
seek_to_beginning(f);
f.write_all(&bs).unwrap();
seek_to_beginning(f);
}
pub fn corrupt_file_at(p: &Path) {
let mut f: File = OpenOptions::new().write(true).read(true).open(p).unwrap();
corrupt_file(&mut f)
}
