static void setup(ulong32 *dk, ulong32 *k, ulong32 *uk)
{
int n, t;
ulong32 p[2];
p[0] = dk[0]; p[1] = dk[1];
t = 4;
n = 0;
pi1(p);
pi2(p, k);
uk[n++] = p[0];
pi3(p, k);
uk[n++] = p[1];
pi4(p, k);
uk[n++] = p[0];
pi1(p);
uk[n++] = p[1];
pi2(p, k+t);
uk[n++] = p[0];
pi3(p, k+t);
uk[n++] = p[1];
pi4(p, k+t);
uk[n++] = p[0];
pi1(p);
uk[n++] = p[1];
}
static void encrypt(ulong32 *p, int N, ulong32 *uk)
{
int n, t;
for (t = n = 0; ; ) {
pi1(p); if (++n == N) break;
pi2(p, uk+t); if (++n == N) break;
pi3(p, uk+t); if (++n == N) break;
pi4(p, uk+t); if (++n == N) break;
t ^= 4;
}
}
static void decrypt(ulong32 *p, int N, ulong32 *uk)
{
int n, t;
for (t = 4*((N&1)^1), n = N; ; ) {
switch (n >= 4 ? 4 : 0) {
case 4: pi4(p, uk+t); --n;
case 3: pi3(p, uk+t); --n;
case 2: pi2(p, uk+t); --n;
case 1: pi1(p); --n; break;
case 0: return;
}
t ^= 4;
}
}
static bool IsQuadrangle(cv::Point2f p1,
cv::Point2f p2,
cv::Point2f p3,
cv::Point2f p4) {
cv::Point2d pi1((int)p1.x, (int)p1.y);
cv::Point2d pi2((int)p2.x, (int)p2.y);
cv::Point2d pi3((int)p3.x, (int)p3.y);
cv::Point2d pi4((int)p4.x, (int)p4.y);
return !(IsOverlapped(pi1, pi2) ||
IsOverlapped(pi1, pi3) ||
IsOverlapped(pi1, pi4) ||
IsOverlapped(pi2, pi3) ||
IsOverlapped(pi2, pi4) ||
IsOverlapped(pi3, pi4) ||
IsLine(pi1, pi2, pi3) ||
IsLine(pi1, pi2, pi4) ||
IsLine(pi2, pi3, pi4));
}
