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)