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| scan_asn1dertag(3) | FreeBSD Library Functions Manual | scan_asn1dertag(3) |
NAME
scan_asn1dertag - decode an unsigned integer from ASN.1 DER length encodingSYNTAX
#include <libowfat/scan.h>size_t scan_asn1dertag(const char *src,size_t len,unsigned long long *dest);
DESCRIPTION
scan_asn1dertag decodes an unsigned integer in ASN.1 DER tag encoding from a memory area holding binary data. It writes the decode value in dest and returns the number of bytes it read from src.scan_asn1dertag never reads more than len bytes from src. If the sequence is longer than that, or the memory area contains an invalid sequence, scan_asn1dertag returns 0 and does not touch dest.
The length of the longest ASN.1 DER length sequence is 128 bytes. In practice the largest sequence is sizeof(*dest)+1.
SEE ALSO
fmt_asn1dertag(3)
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