e04ca78ff8
fmt_asn1generic, see t10.c for example usage) add "generic" asn.1 dumper (in t10.c) fix some read off-by-one errors, minor cleanups add real OID support add bitstring support
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
#include "asn1.h"
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size_t scan_asn1oid(const char* src,const char* max,unsigned long* array,unsigned long* arraylen) {
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const char* orig=src;
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size_t res,tlen,cur=0,al;
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unsigned long tag,tmp;
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enum asn1_tagclass tc;
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enum asn1_tagtype tt;
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if (!arraylen) return 0;
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al=*arraylen; *arraylen=0;
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if (!(res=scan_asn1tag(src,max,&tc,&tt,&tag))) return 0;
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if (tc!=UNIVERSAL || tt!=PRIMITIVE || tag!=OBJECT_IDENTIFIER) return 0;
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if (!(tmp=scan_asn1length(src+res,max,&tlen))) return 0;
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if (tlen<1) return 0; /* there has to be at least one octet */
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res+=tmp;
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if (max>src+res+tlen) max=src+res+tlen; /* clamp max down */
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src+=res;
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{
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int a,b;
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a=(unsigned char)*src;
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b=a%40;
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a/=40;
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/* a can be 0, 1 or 2. And b is <=39 if a is 0 or 1.
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* So, if a is bigger than 2, it is really 2 */
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if (a>2) {
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b+=(a-2)*40;
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a=2;
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}
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if (array && cur<al) array[cur]=a; ++cur;
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if (array && cur<al) array[cur]=b; ++cur;
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}
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for (++src; src<max; ) {
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size_t i;
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unsigned long tmp;
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if (!(i=scan_asn1tagint(src,max,&tmp)))
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return 0;
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src+=i;
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if (array && cur<al) array[cur]=tmp; ++cur;
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}
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/* if we got this far, then we have an OID, but it might not have fit */
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*arraylen=cur;
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if (cur>al) /* did not fit */
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return 0;
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return src-orig;
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}
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