libccp 1.2.0

Rust bindings for libccp, a library for implementing CCP-compatible datapaths
Documentation 
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// libccp rust bindings
#![allow(deref_nullptr, non_snake_case)]
include!(concat!(env!("OUT_DIR"), "/libccp.rs"));

use super::DatapathObj;

#[unsafe(no_mangle)]
pub extern "C" fn send_msg(
    dp: *mut ccp_datapath,
    msg: *mut ::std::os::raw::c_char,
    msg_size: ::std::os::raw::c_int,
) -> std::os::raw::c_int {
    // get the impl CcpDatapath
    let mut dp: Box<DatapathObj> = unsafe {
        use std::mem;
        let dp = mem::transmute((*dp).impl_);
        Box::from_raw(dp)
    };

    // construct the slice
    use std::slice;
    let buf = unsafe { slice::from_raw_parts(msg as *mut u8, msg_size as usize) };

    // send the message using the provided impl
    dp.0.send_msg(buf);

    // "leak" the Box because *mut ccp::ccp_datapath still owns it
    Box::leak(dp);

    return 0;
}

#[unsafe(no_mangle)]
pub extern "C" fn log(
    dp: *mut ccp_datapath,
    level: ccp_log_level,
    msg: *const std::os::raw::c_char,
    len: i32,
) {
    // get the impl CcpDatapath
    let mut dp: Box<DatapathObj> = unsafe {
        use std::mem;
        let dp = mem::transmute((*dp).impl_);
        Box::from_raw(dp)
    };

    // construct the slice
    use std::slice;
    let buf = unsafe { slice::from_raw_parts(msg as *mut u8, len as usize) };

    // make a str
    let msg: &'static str = match std::str::from_utf8(buf) {
        Ok(s) => s,
        Err(_) => return,
    };

    // log the str
    dp.0.log(level, msg);

    // "leak" the Box because *mut ccp::ccp_datapath still owns it
    Box::leak(dp);
}

use super::ConnectionObj;

#[unsafe(no_mangle)]
pub extern "C" fn set_cwnd(conn: *mut ccp_connection, cwnd: u32) {
    // get the impl ConnectionObj
    let mut conn: Box<ConnectionObj> = unsafe {
        use std::mem;
        let conn = mem::transmute((*conn).impl_);
        Box::from_raw(conn)
    };

    conn.0.set_cwnd(cwnd);

    // "leak" the Box because *mut ccp::ccp_datapath still owns it
    Box::leak(conn);
}

#[unsafe(no_mangle)]
pub extern "C" fn set_rate_abs(conn: *mut ccp_connection, rate: u32) {
    // get the impl ConnectionObj
    let mut conn: Box<ConnectionObj> = unsafe {
        use std::mem;
        let conn = mem::transmute((*conn).impl_);
        Box::from_raw(conn)
    };

    conn.0.set_rate_abs(rate);

    // "leak" the Box because *mut ccp::ccp_datapath still owns it
    Box::leak(conn);
}

#[unsafe(no_mangle)]
pub extern "C" fn now() -> u64 {
    time::precise_time_ns()
}

#[unsafe(no_mangle)]
pub extern "C" fn since_usecs(then: u64) -> u64 {
    (time::precise_time_ns() - then) / 1_000
}

#[unsafe(no_mangle)]
pub extern "C" fn after_usecs(usecs: u64) -> u64 {
    time::precise_time_ns() + usecs * 1_000
}