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use cfb::CompoundFile;
use rand::prelude::{Rng, SeedableRng};
use rand_pcg::Pcg32;
use std::io::{Cursor, Seek, SeekFrom, Write};
use std::path::PathBuf;
/// Regression test for https://github.com/mdsteele/rust-cfb/issues/12.
#[test]
fn large_file_issue_12() {
// Use a reproducible PRNG sequence.
let mut rng = Pcg32::from_seed(*b"1941039482934820");
let cursor = Cursor::new(Vec::new());
let mut comp = CompoundFile::create(cursor).unwrap();
for _ in 0..50 {
// Generate a random path.
let mut path = PathBuf::new();
for _ in 0..6 {
path.push(format!("{:08x}", rng.gen::<u64>()));
}
comp.create_storage_all(&path).unwrap();
path.push("file");
// Create a stream with a random amount of data, chosen such that
// sometimes the length is below the mini-stream cutoff of 4096, and
// sometimes it's above.
let length: usize = rng.gen_range(4000..4200);
let data = vec![0x11; length];
comp.create_stream(&path).unwrap().write_all(&data).unwrap();
// Open the same stream again, and append a bit more data to the end.
let mut stream = comp.open_stream(&path).unwrap();
stream.seek(SeekFrom::End(0)).unwrap();
stream.write_all(b"additional test data").unwrap();
}
let cursor = comp.into_inner();
let _comp = CompoundFile::open_strict(cursor).expect("re-open");
}
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