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#include "os.h"
#include <mp.h>
#include "dat.h"
/* convert an mpint into a little endian byte array (least significant byte first) */
/* return number of bytes converted */
/* if p == nil, allocate and result array */
int
mptole(mpint *b, uchar *p, uint n, uchar **pp)
{
int i, j;
mpdigit x;
uchar *e, *s;
if(p == nil){
n = (b->top+1)*Dbytes;
p = malloc(n);
}
if(pp != nil)
*pp = p;
if(p == nil)
return -1;
memset(p, 0, n);
/* special case 0 */
if(b->top == 0){
if(n < 1)
return -1;
else
return 0;
}
s = p;
e = s+n;
for(i = 0; i < b->top-1; i++){
x = b->p[i];
for(j = 0; j < Dbytes; j++){
if(p >= e)
return -1;
*p++ = x;
x >>= 8;
}
}
x = b->p[i];
while(x > 0){
if(p >= e)
return -1;
*p++ = x;
x >>= 8;
}
return p - s;
}
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