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Enable Rust code to call C++ Source objects

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This commit is contained in:
Eelco Dolstra 2019-03-27 20:45:56 +01:00
parent 11da5b2816
commit e60f6bd4ce
2 changed files with 45 additions and 8 deletions
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19
nix-rust/src/lib.rs
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@ -7,13 +7,28 @@ use std::os::unix::fs::OpenOptionsExt;
use std::path::Path;
use tar::Archive;
/// A wrapper around Nix's Source class that provides the Read trait.
#[repr(C)]
pub struct Source {
fun: extern "C" fn(this: *mut libc::c_void, data: &mut [u8]) -> usize,
this: *mut libc::c_void,
}
impl std::io::Read for Source {
fn read(&mut self, buf: &mut [u8]) -> std::result::Result<usize, std::io::Error> {
let n = (self.fun)(self.this, buf);
assert!(n <= buf.len());
Ok(n)
}
}
#[no_mangle]
pub extern "C" fn unpack_tarfile(data: &[u8], dest_dir: &str) -> bool {
pub extern "C" fn unpack_tarfile(source: Source, dest_dir: &str) -> bool {
// FIXME: handle errors.
let dest_dir = Path::new(dest_dir);
let mut tar = Archive::new(data);
let mut tar = Archive::new(source);
for file in tar.entries().unwrap() {
let mut file = file.unwrap();