/* q*t + r == s [e.g. s/t, q=quotient, r=remainder]. */
static void ccn_divn(cc_size nqs, cc_unit *q, cc_unit *r, const cc_unit *s, size_t nrt, cc_unit *t) {
if (ccn_is_zero(nrt, t)) {
/* Division by zero is illegal. */
return;
}
/* If s < t then q = 0, r = s */
if (ccn_cmpn(nqs, s, nrt, t) < 0) {
if (r) ccn_setn(nrt, r, CC_MIN(nrt, nqs), s);
if (q) ccn_zero(nqs, q);
return;
}
/* s >= t => k >= 0 */
size_t k = ccn_bitlen(nqs, s);
size_t l = ccn_bitlen(nrt, t);
assert(k >= l);
k -= l;
cc_unit tr[nqs];
cc_unit tt[nqs];
cc_unit tq[nqs];
ccn_set(nqs, tr, s);
ccn_setn(nqs, tt, nrt, t);
ccn_shift_left_multi(nqs, tt, tt, k);
ccn_zero(nqs, tq);
for (;;) {
if (ccn_cmp(nqs, tr, tt) >= 0) {
ccn_sub(nqs, tr, tr, tt);
ccn_set_bit(tq, k, 1);
}
if (!k)
break;
--k;
ccn_shift_right(nqs, tt, tt, 1);
}
if (r) {
ccn_setn(nrt, r, CC_MIN(nrt, nqs), tr);
}
if (q) {
ccn_set(nqs, q, tq);
}
}
bool CCControlPotentiometer::isTouchInside(CCTouch * touch)
{
CCPoint touchLocation = this->getTouchLocation(touch);
float distance = this->distanceBetweenPointAndPoint(m_pProgressTimer->getPosition(), touchLocation);
return distance < CC_MIN(getContentSize().width / 2, getContentSize().height / 2);
}
void ccmode_ctr_crypt(ccctr_ctx *key,
size_t nbytes, const void *in, void *out) {
const struct ccmode_ecb *ecb = CCMODE_CTR_KEY_ECB(key);
const ccecb_ctx *ecb_key = CCMODE_CTR_KEY_ECB_KEY(key);
uint8_t *ctr = (uint8_t *)CCMODE_CTR_KEY_CTR(key);
uint8_t *pad = (uint8_t *)CCMODE_CTR_KEY_PAD(key);
cc_size pad_len = CCMODE_CTR_KEY_PAD_LEN(key);
const uint8_t *pt = in;
// Counter is 64bit wide for cipher with block size of 64bit or more
// This is to match the assembly
const size_t counter_size=(CC_MIN(ecb->block_size,(typeof(ecb->block_size))8));
uint8_t *ct = out;
while (nbytes) {
if (pad_len == ecb->block_size) {
ecb->ecb(ecb_key, 1, ctr, pad);
pad_len = 0;
/* increment the big endian counter */
for (size_t x = ecb->block_size; x-- > (ecb->block_size-counter_size);) {
ctr[x] = (ctr[x] + (unsigned char)1) & (unsigned char)255;
if (ctr[x] != (unsigned char)0) {
break;
}
}
if (nbytes==0) break;
}
/* TODO: Make sure this works. If pt and ct aren't aligned this
might not work right. */
#if 0
if (pad_len == 0 && nbytes >= ecb->block_size) {
ccn_xor(ecb->block_size / CCN_UNIT_SIZE, ct, pt, pad);
pad_len = ecb->block_size;
pt += pad_len;
ct += pad_len;
nbytes -= pad_len;
}
#endif
do {
*ct++ = *pt++ ^ pad[pad_len++];
--nbytes;
} while ((nbytes>0)&&(pad_len<ecb->block_size));
}
CCMODE_CTR_KEY_PAD_LEN(key) = pad_len;
}
float CCControlSlider::valueForLocation(CCPoint location)
{
float percent = location.x/ m_backgroundSprite->getContentSize().width;
return CC_MAX(CC_MIN(m_minimumValue + percent * (m_maximumValue - m_minimumValue), m_maximumAllowedValue), m_minimumAllowedValue);
}