rawsock 0.3.0

Library for receiving and sending raw packets. While most crate wrap just one library, rawsock allows you to use pcap, wpcap, npcap and pf_ring (pfring) using a consistent API for all of them.
Documentation 
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use super::structs::PCapPacketHeader;
use crate::BorrowedPacket;

use time::Timespec;
use std::slice::from_raw_parts;
use libc::{c_uchar};
use std::mem::transmute;

pub fn borrowed_packet_from_header<'a, 'b>(header: &'a PCapPacketHeader, data: * const u8) -> BorrowedPacket<'b> {
    unsafe {
        BorrowedPacket::new(Timespec::new(header.ts.tv_sec as i64, (header.ts.tv_usec * 1000) as i32), from_raw_parts(data, header.caplen as usize))
    }
}

pub extern "C" fn on_received_packet_static<F>(user: * mut c_uchar, h: * const PCapPacketHeader, bytes: * const c_uchar) where F: FnMut(&BorrowedPacket){
    let callback: &mut F = unsafe{transmute(user)};

    let packet = borrowed_packet_from_header(unsafe{&*h}, bytes);
    callback(&packet)
}

pub extern "C" fn on_received_packet_dynamic(user: * mut c_uchar, h: * const PCapPacketHeader, bytes: * const c_uchar){
    let callback: &mut &mut dyn FnMut(&BorrowedPacket) = unsafe{transmute(user)};

    let packet = borrowed_packet_from_header(unsafe{&*h}, bytes);
    callback(&packet)
}