Function handle_file

src/compression.rs:36–63

(file: &PathBuf, compression: Option<Compression>)

}

fn handle_file(file: &PathBuf, compression: Option<Compression>) -> io::Result<bool> {
    let est = Compresstimator::with_block_size(8192);
    let meta = std::fs::metadata(&file)?;
    let handle = std::fs::OpenOptions::new()
        .access_mode(FILE_WRITE_ATTRIBUTES | FILE_READ_DATA)
        .open(&file)?;

    handle.try_lock_exclusive()?;

    let ret = match compression {
        Some(compression) => match est.compresstimate(&handle, meta.len()) {
            Ok(ratio) if ratio < 0.95 => compact::compress_file_handle(&handle, compression),
            Ok(_) => Ok(false),
            Err(e) => Err(e),
        },
        None => compact::uncompress_file_handle(&handle).map(|_| true),
    };

    let _ = filetime::set_file_handle_times(
        &handle,
        Some(FileTime::from_last_access_time(&meta)),
        Some(FileTime::from_last_modification_time(&meta)),
    );

    handle.unlock()?;

    ret
}

impl Background for BackgroundCompactor {
    type Output = ();