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18 lines
428 B
C
18 lines
428 B
C
#include "scan.h"
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size_t scan_asn1dertag(const char* src,size_t len,unsigned long long* length) {
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size_t n;
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unsigned long long l=0;
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if (len==0 || (unsigned char)src[0]==0x80) return 0; // catch non-minimal encoding
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for (n=0; n<len; ++n) {
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if (l>>(sizeof(l)*8-7)) return 0; // catch integer overflow
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l=(l<<7) | (src[n]&0x7f);
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if (!(src[n]&0x80)) {
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*length=l;
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return n+1;
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}
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}
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return 0;
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}
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