pawkit-c 0.1.0

PawKit's C(++) bindings
Documentation 
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use std::{
    ffi::c_char,
    ptr::{null, null_mut},
};

use pawkit_net::{NetHostPeerEvent, SimpleNetHostPeer};

use crate::{cstr_to_str, drop_from_heap, move_to_heap, ptr_to_slice};

#[no_mangle]
unsafe extern "C" fn pawkit_net_host_peer_create(
    server_url: *const c_char,
    game_id: u32,
) -> *mut SimpleNetHostPeer {
    let Some(server_url) = cstr_to_str(server_url) else {
        return null_mut();
    };

    let Some(peer) = SimpleNetHostPeer::create(server_url, game_id) else {
        return null_mut();
    };

    return move_to_heap(peer);
}

#[no_mangle]
unsafe extern "C" fn pawkit_net_host_peer_destroy(peer: *mut SimpleNetHostPeer) {
    if peer.is_null() {
        return;
    }

    drop_from_heap(peer);
}

#[no_mangle]
unsafe extern "C" fn pawkit_net_host_peer_send_packet(
    peer: *mut SimpleNetHostPeer,
    client_id: usize,
    data: *const u8,
    size: usize,
) {
    if peer.is_null() || data.is_null() || size == 0 {
        return;
    }

    (*peer).send_packet(client_id, ptr_to_slice(data, size));
}

#[no_mangle]
unsafe extern "C" fn pawkit_net_host_poll_event(
    peer: *mut SimpleNetHostPeer,
) -> *mut NetHostPeerEvent {
    if peer.is_null() {
        return null_mut();
    }

    let Some(evt) = (*peer).next_event() else {
        return null_mut();
    };

    return move_to_heap(evt);
}

#[no_mangle]
unsafe extern "C" fn pawkit_net_host_event_free(evt: *mut NetHostPeerEvent) {
    if evt.is_null() {
        return;
    }

    drop_from_heap(evt);
}

const PEER_CONNECTED: i32 = 0;
const PEER_DISCONNECTED: i32 = 1;
const PACKET_RECEIVED: i32 = 2;
const HOST_ID_UPDATED: i32 = 3;

#[no_mangle]
unsafe extern "C" fn pawkit_net_host_event_get_type(evt: *mut NetHostPeerEvent) -> i32 {
    if evt.is_null() {
        return -1;
    }

    return match &*evt {
        NetHostPeerEvent::PeerConnected { peer_id: _ } => PEER_CONNECTED,
        NetHostPeerEvent::PeerDisconnected { peer_id: _ } => PEER_DISCONNECTED,
        NetHostPeerEvent::PacketReceived {
            peer_id: _,
            data: _,
        } => PACKET_RECEIVED,
        NetHostPeerEvent::HostIdUpdated => HOST_ID_UPDATED,
    };
}

#[no_mangle]
unsafe extern "C" fn pawkit_net_host_event_get_peer_id(evt: *mut NetHostPeerEvent) -> usize {
    if evt.is_null() {
        return usize::MAX;
    }

    return match &*evt {
        NetHostPeerEvent::PeerConnected { peer_id } => *peer_id,
        NetHostPeerEvent::PeerDisconnected { peer_id } => *peer_id,
        NetHostPeerEvent::PacketReceived { peer_id, data: _ } => *peer_id,
        NetHostPeerEvent::HostIdUpdated => usize::MAX,
    };
}

#[no_mangle]
unsafe extern "C" fn pawkit_net_host_event_get_data(
    evt: *mut NetHostPeerEvent,
    len: *mut usize,
) -> *const u8 {
    if evt.is_null() || len.is_null() {
        return null();
    }

    let NetHostPeerEvent::PacketReceived { peer_id: _, data } = &*evt else {
        return null();
    };

    *len = data.len();

    return data.as_ptr();
}