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#![allow(dead_code,
mutable_transmutes,
non_camel_case_types,
non_snake_case,
non_upper_case_globals,
unused_mut)]
#![feature(libc)]
extern crate libc;
unsafe extern "C" fn rot(mut n: libc::c_uint, mut x: *mut libc::c_uint,
mut y: *mut libc::c_uint, mut _rx: libc::c_uint,
mut _ry: libc::c_uint) -> () {
if _ry == 0i32 as libc::c_uint {
if _rx == 1i32 as libc::c_uint {
*x = n.wrapping_sub(1i32 as libc::c_uint).wrapping_sub(*x);
*y = n.wrapping_sub(1i32 as libc::c_uint).wrapping_sub(*y)
}
let mut t: libc::c_uint = *x;
*x = *y;
*y = t
};
}
unsafe extern "C" fn _xy2d(mut n: libc::c_uint, mut x: libc::c_uint,
mut y: libc::c_uint) -> libc::c_uint {
let mut _rx: libc::c_uint = 0;
let mut _ry: libc::c_uint = 0;
let mut _s: libc::c_uint = 0;
let mut d: libc::c_uint = 0i32 as libc::c_uint;
_s = n.wrapping_div(2i32 as libc::c_uint);
while _s > 0i32 as libc::c_uint {
_rx = (x & _s > 0i32 as libc::c_uint) as libc::c_int as libc::c_uint;
_ry = (y & _s > 0i32 as libc::c_uint) as libc::c_int as libc::c_uint;
d =
d.wrapping_add(_s.wrapping_mul(_s).wrapping_mul((3i32 as
libc::c_uint).wrapping_mul(_rx)
^ _ry));
rot(_s, &mut x, &mut y, _rx, _ry);
_s = _s.wrapping_div(2i32 as libc::c_uint)
}
return d;
}
unsafe extern "C" fn _d2xy(mut n: libc::c_uint, mut d: libc::c_uint,
mut x: *mut libc::c_uint,
mut y: *mut libc::c_uint) -> () {
let mut _rx: libc::c_uint = 0;
let mut _ry: libc::c_uint = 0;
let mut _s: libc::c_uint = 0;
let mut t: libc::c_uint = d;
*y = 0i32 as libc::c_uint;
*x = *y;
_s = 1i32 as libc::c_uint;
while _s < n {
_rx = 1i32 as libc::c_uint & t.wrapping_div(2i32 as libc::c_uint);
_ry = 1i32 as libc::c_uint & (t ^ _rx);
rot(_s, x, y, _rx, _ry);
*x = (*x).wrapping_add(_s.wrapping_mul(_rx));
*y = (*y).wrapping_add(_s.wrapping_mul(_ry));
t = t.wrapping_div(4i32 as libc::c_uint);
_s = _s.wrapping_mul(2i32 as libc::c_uint)
};
}
pub fn xy2d(x: libc::c_uint, y: libc::c_uint, n: libc::c_uint) -> (libc::c_uint) {
unsafe {
return _xy2d(x, y, n);
}
}
pub fn d2xy(n: libc::c_uint, d: libc::c_uint) -> (libc::c_uint, libc::c_uint) {
unsafe {
let mut x: libc::c_uint = 0;
let mut y: libc::c_uint = 0;
_d2xy(n, d, &mut x as *mut libc::c_uint, &mut y as *mut libc::c_uint);
return (x, y);
}
}
#[test]
fn xy2d_simple() {
assert_eq!(xy2d(1,1,1), 0);
assert_eq!(xy2d(1,1,2), 0);
assert_eq!(xy2d(2,1,4), 3);
}
#[test]
fn d2xy_simple() {
assert_eq!(d2xy(2, 0), (0, 0));
assert_eq!(d2xy(2, 1), (0, 1));
assert_eq!(d2xy(2, 2), (1, 1));
assert_eq!(d2xy(2, 3), (1, 0));
}