libmmap 0.1.0

Documentation 
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extern crate libmmap;
extern crate libc;
extern crate tempdir;

use libmmap::{MemoryMap, MemoryMapOption};

#[test]
fn memory_map_rw() {
    let mut chunk = match MemoryMap::new(16,
                                         &[MemoryMapOption::Readable,
                                           MemoryMapOption::Writable]) {
        Ok(chunk) => chunk,
        Err(msg) => panic!("Allocation failed: {:?}", msg),
    };

    assert!(chunk.len() >= 16);

    chunk.set_data(0xBE as *mut u8);
    assert!(chunk.data() == 0xBE as *mut u8);
}

#[test]
fn memory_map_file() {
    use std::fs;
    use std::io::{Seek, SeekFrom, Write};

    #[cfg(unix)]
    fn get_fd(file: &fs::File) -> libc::c_int {
        use std::os::unix::io::AsRawFd;
        file.as_raw_fd()
    }

    #[cfg(windows)]
    fn get_fd(file: &fs::File) -> libc::HANDLE {
        use std::os::windows::io::AsRawHandle;
        file.as_raw_handle()
    }

    let tmpdir = tempdir::TempDir::new("").expect("Couldn't create tempdir");
    let mut path = tmpdir.path().to_path_buf();
    path.push("mmap_file.tmp");
    let size = MemoryMap::granularity() * 2;

    let mut file = fs::OpenOptions::new()
        .create(true)
        .read(true)
        .write(true)
        .open(&path)
        .expect("Couldn't create temd file");

    file.seek(SeekFrom::Start(size as u64)).unwrap();
    file.write(b"\0").unwrap();

    let fd = get_fd(&file);

    let mut chunk = MemoryMap::new(size / 2,
                                   &[MemoryMapOption::Readable,
                                     MemoryMapOption::Writable,
                                     MemoryMapOption::Fd(fd),
                                     MemoryMapOption::Offset(size / 2)])
        .unwrap();
    assert!(chunk.len() > 0);

    chunk.set_data(0xbe as *mut u8);
    chunk.set_data(0xbe as *mut u8);
    assert!(chunk.data() == 0xbe as *mut u8);

    fs::remove_file(&path).expect("Couldn't remove file");
}