DragonFly On-Line Manual Pages

scan_asn1derlength(3)                       DragonFly Library Functions Manual

NAME
       scan_asn1derlength - decode an unsigned integer from ASN.1 DER length
       encoding

SYNTAX
       #include <scan.h>

       size_t scan_asn1derlength(const char *src,size_t len,unsigned long long
       *dest);

DESCRIPTION
       scan_asn1derlength decodes an unsigned integer in ASN.1 DER length
       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_asn1derlength never reads more than len bytes from src.  If the
       sequence is longer than that, or the memory area contains an invalid
       sequence, scan_asn1derlength 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_asn1derlength(3)

                                                         scan_asn1derlength(3)