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// Copyright 2018 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Exported interface to basic qcow functionality to be used from C.
extern crate libc;
extern crate qcow;
use libc::{EBADFD, EINVAL, EIO};
use std::ffi::CStr;
use std::fs::{File, OpenOptions};
use std::mem::forget;
use std::os::raw::{c_char, c_int};
use std::os::unix::io::FromRawFd;
use std::panic::catch_unwind;
use qcow::{ImageType, QcowFile};
#[no_mangle]
pub unsafe extern "C" fn create_qcow_with_size(path: *const c_char, virtual_size: u64) -> c_int {
// NULL pointers are checked, but this will access any other invalid pointer passed from C
// code. It's the caller's responsibility to pass a valid pointer.
if path.is_null() {
return -EINVAL;
}
let c_str = CStr::from_ptr(path);
let file_path = match c_str.to_str() {
Ok(s) => s,
Err(_) => return -EINVAL,
};
let file = match OpenOptions::new()
.create(true)
.read(true)
.write(true)
.open(file_path)
{
Ok(f) => f,
Err(_) => return -1,
};
match QcowFile::new(file, virtual_size) {
Ok(_) => 0,
Err(_) => -1,
}
}
#[no_mangle]
pub unsafe extern "C" fn convert_to_qcow2(src_fd: c_int, dst_fd: c_int) -> c_int {
// The caller is responsible for passing valid file descriptors.
// The caller retains ownership of the file descriptors.
let src_file = File::from_raw_fd(src_fd);
let src_file_owned = src_file.try_clone();
forget(src_file);
let dst_file = File::from_raw_fd(dst_fd);
let dst_file_owned = dst_file.try_clone();
forget(dst_file);
match (src_file_owned, dst_file_owned) {
(Ok(src_file), Ok(dst_file)) => {
catch_unwind(
|| match qcow::convert(src_file, dst_file, ImageType::Qcow2) {
Ok(_) => 0,
Err(_) => -EIO,
},
).unwrap_or(-EIO)
}
_ => -EBADFD,
}
}
#[no_mangle]
pub unsafe extern "C" fn convert_to_raw(src_fd: c_int, dst_fd: c_int) -> c_int {
// The caller is responsible for passing valid file descriptors.
// The caller retains ownership of the file descriptors.
let src_file = File::from_raw_fd(src_fd);
let src_file_owned = src_file.try_clone();
forget(src_file);
let dst_file = File::from_raw_fd(dst_fd);
let dst_file_owned = dst_file.try_clone();
forget(dst_file);
match (src_file_owned, dst_file_owned) {
(Ok(src_file), Ok(dst_file)) => {
catch_unwind(|| match qcow::convert(src_file, dst_file, ImageType::Raw) {
Ok(_) => 0,
Err(_) => -EIO,
}).unwrap_or(-EIO)
}
_ => -EBADFD,
}
}
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