5b980e3f93
mstorage_add can now allocate larger chunks (and parse uses 1 MiB) fix small oversight in addindex putting wrong index size in header more integer overflow checks in asn1 code (not security relevant) fix missing initialization in asn1 routines (not security relevant, code section not triggered by ldap)
27 lines
756 B
C
27 lines
756 B
C
#include "asn1.h"
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int scan_asn1tag(const char* src,const char* max,enum asn1_tagclass* tc,enum asn1_tagtype* tt,unsigned long* tag) {
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const char* orig=src;
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*tc=(*src&0xC0);
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*tt=(*src&0x20);
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if (max<src) return 0;
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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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unsigned long l=0;
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for (;;) {
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++src;
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if (src>max) return 0;
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if (l>(((unsigned long)-1)>>7)) return 0; /* catch integer overflow */
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l=l*128+(*src&0x7F);
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if (!(*src&0x80)) break;
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}
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*tag=l;
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return (src-orig+1);
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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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