You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

16 lines
450 B

#include "fmt.h"
/* write int in least amount of bytes, return number of bytes */
/* as used in ASN.1 DER tag */
size_t fmt_asn1dertag(char* dest,unsigned long long l) {
/* high bit says if more bytes are coming, lower 7 bits are payload; big endian */
size_t n=0,i;
unsigned long long t;
for (t=l, n=1; t>0x7f; t>>=7) ++n;
for (i=0; i<n; ++i) {
if (dest) dest[n-i-1]=(char)(((i!=0)<<7) | (char)(l&0x7f));
return i;