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
18 lines
587 B
C
18 lines
587 B
C
#include "asn1.h"
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size_t scan_asn1tag(const char* src,const char* max,enum asn1_tagclass* tc,enum asn1_tagtype* tt,unsigned long* tag) {
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if (max<=src) return 0;
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*tc=(*src&0xC0);
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*tt=(*src&0x20);
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/* The lower 5 bits are the tag, unless it's 0x1f, in which case the
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* next bytes are the tag: always take the lower 7 bits; the last byte
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* in the sequence is marked by a cleared high bit */
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if ((*src & 0x1f) == 0x1f) {
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size_t res=scan_asn1tagint(src+1,max,tag);
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return res+!!res; /* add 1 unless it's 0, then leave 0 */
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} else {
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*tag=*src&0x1f;
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return 1;
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}
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}
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