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//! ```cargo
//! [dependencies]
//! ar = "0.6.2"
//! ```
use std::io::Read;
// 64 gives Invalid file size field in entry header
// 32 gives unexpected EOF in the middle of archive entry header
const METADATA_LEN: usize = 64;
fn main() {
let mut builder = ar::Builder::new(std::fs::File::create("test.a").expect("create"));
// Remove this append and there is no problem.
let header = ar::Header::new(b"core-fc675157235ea9.dummy_name.rcgu.o".to_vec(), 0);
// Remove any of the characters in the filename and ! from will show up in the error message.
// Making it shorter than 17 chars will fix the problem though.
builder.append(&header, &mut (&[] as &[u8])).expect("add rcgu");
let mut buf: Vec<u8> = vec!['!' as u8; 28];
buf.extend(b"hello worl");
buf.extend(&[0u8; 26] as &[u8]);
assert!(buf.len() >= METADATA_LEN);
let header = ar::Header::new(b"rust.metadata.bin".to_vec(), METADATA_LEN as u64);
builder.append(&header, &mut (&buf[0..METADATA_LEN])).expect("add meta");
std::mem::drop(builder);
// Remove this ranlib invocation and there is no problem.
assert!(
std::process::Command::new("ranlib")
.arg("test.a")
.status()
.expect("Couldn't run ranlib")
.success()
);
let mut archive = ar::Archive::new(std::fs::File::open("test.a").expect("open"));
while let Some(entry) = archive.next_entry() {
entry.unwrap();
}
}thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Custom { kind: InvalidData, error: StringError("Invalid file size field in entry header (\"hello worl\")") }', src/libcore/result.rs:997:5
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Custom { kind: UnexpectedEof, error: StringError("unexpected EOF in the middle of archive entry header") }', src/libcore/result.rs:997:5
Edit: change example to be clearer.
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