Man page - scan_asn1dertag(3)

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Manual

scan_asn1dertag

NAME
SYNTAX
DESCRIPTION
SEE ALSO

NAME

scan_asn1dertag - decode an unsigned integer from ASN.1 DER length encoding

SYNTAX

#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)