27 lines
544 B
C
27 lines
544 B
C
#include "asn1.h"
|
|
|
|
/* write int in least amount of bytes, return number of bytes */
|
|
/* as used in ASN.1 length */
|
|
unsigned int fmt_asn1length(char* dest,unsigned long l) {
|
|
/* encoding is either l%128 or (0x80+number of bytes,bytes) */
|
|
int needed=(sizeof l);
|
|
int i;
|
|
if (l<128) {
|
|
if (dest) *dest=l&0x7f;
|
|
return 1;
|
|
}
|
|
for (i=1; i<needed; ++i)
|
|
if (!(l>>(i*8)))
|
|
break;
|
|
if (dest) {
|
|
int j=i;
|
|
*dest=0x80+i; ++dest;
|
|
while (j) {
|
|
--j;
|
|
*dest=((l>>(j*8))&0xff);
|
|
++dest;
|
|
}
|
|
}
|
|
return i+1;
|
|
}
|