netReadWindows

fn netReadWindows(socket_handle: net.Socket.Handle, data: [][]u8) net.Stream.Reader.Error!usize {
    var iovecs: [max_iovecs_len]windows.AFD.WSABUF(.@"var") = undefined;
    var len: u32 = 0;
    for (data) |buf| {
        if (iovecs.len - len == 0) break;
        addAfdBuf(.@"var", &iovecs, &len, buf);
    }

    const iosb = try deviceIoControl(&.{
        .file = .{ .handle = socket_handle, .flags = .{ .nonblocking = true } },
        .code = windows.IOCTL.AFD.RECEIVE,
        .in = @ptrCast(&windows.AFD.RECV_INFO{
            .BufferArray = &iovecs,
            .BufferCount = len,
            .AfdFlags = .{ .NO_FAST_IO = true, .OVERLAPPED = true },
            .TdiFlags = .{ .NORMAL = true },
        }),
    });
    switch (iosb.u.Status) {
        .SUCCESS => return iosb.Information,
        .CANCELLED => unreachable,
        .INSUFFICIENT_RESOURCES => return error.SystemResources,
        .CONNECTION_RESET, .REMOTE_DISCONNECT => return error.ConnectionResetByPeer,
        .IO_TIMEOUT => return error.ConnectionTimedOut,
        else => |status| return windows.unexpectedStatus(status),
    }
}