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#include "project.h"
int set_parity (uint8_t *d, unsigned s, unsigned e)
{
unsigned i;
uint8_t p = 0;
for (i = s; i <= e; ++i)
p ^= d[i];
return !p;
}
void bcd_set (uint8_t *d, unsigned s, unsigned e, unsigned v)
{
unsigned c, i, w;
w = v % 10;
for (i = e, c = 1 ; i >= s; --i) {
d[i] = !! (c & w) ;
if (c & 0x77777777)
c <<= 1;
else {
c >>= 3;
v = v / 10;
w = v % 10;
}
}
}
int check_parity (uint8_t *d, unsigned s, unsigned e, uint8_t p)
{
unsigned i;
for (i = s; i <= e; ++i)
p ^= d[i];
return !p;
}
unsigned bcd (uint8_t *d, unsigned s, unsigned e)
{
unsigned ret = 0, c, i;
for (i = e, c = 1 ; i >= s; --i) {
if (d[i]) ret += c;
if (c & 0x77777777)
c <<= 1;
else {
c >>= 3;
c *= 10;
}
}
return ret;
}
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