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add oid and bitstring parsing and formatting to "generic" format string

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routines, test them in t10.c
This commit is contained in:
leitner
2011-04-28 21:33:10 +00:00
parent e04ca78ff8
commit dae3ea8024
12 changed files with 181 additions and 50 deletions
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46
scan_asn1oid.c
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@@ -1,49 +1,21 @@
#include "asn1.h"
size_t scan_asn1oid(const char* src,const char* max,unsigned long* array,unsigned long* arraylen) {
const char* orig=src;
size_t res,tlen,cur=0,al;
size_t scan_asn1oid(const char* src,const char* max,unsigned long* array,size_t* arraylen) {
size_t res,tlen;
unsigned long tag,tmp;
enum asn1_tagclass tc;
enum asn1_tagtype tt;
if (!arraylen) return 0;
al=*arraylen; *arraylen=0;
if (!(res=scan_asn1tag(src,max,&tc,&tt,&tag))) return 0;
if (tc!=UNIVERSAL || tt!=PRIMITIVE || tag!=OBJECT_IDENTIFIER) return 0;
if (!(tmp=scan_asn1length(src+res,max,&tlen))) return 0;
if (tlen<1) return 0; /* there has to be at least one octet */
if (!(res=scan_asn1tag(src,max,&tc,&tt,&tag)) ||
(tc!=UNIVERSAL || tt!=PRIMITIVE || tag!=OBJECT_IDENTIFIER) ||
!(tmp=scan_asn1length(src+res,max,&tlen)) || tlen<1) {
*arraylen=0;
return 0;
}
res+=tmp;
if (max>src+res+tlen) max=src+res+tlen; /* clamp max down */
src+=res;
{
int a,b;
a=(unsigned char)*src;
b=a%40;
a/=40;
/* a can be 0, 1 or 2. And b is <=39 if a is 0 or 1.
* So, if a is bigger than 2, it is really 2 */
if (a>2) {
b+=(a-2)*40;
a=2;
}
if (array && cur<al) array[cur]=a; ++cur;
if (array && cur<al) array[cur]=b; ++cur;
}
for (++src; src<max; ) {
size_t i;
unsigned long tmp;
if (!(i=scan_asn1tagint(src,max,&tmp)))
return 0;
src+=i;
if (array && cur<al) array[cur]=tmp; ++cur;
}
/* if we got this far, then we have an OID, but it might not have fit */
*arraylen=cur;
if (cur>al) /* did not fit */
return 0;
return src-orig;
return scan_asn1rawoid(src,max,array,arraylen);
}