NAME
    Convert::BER::XS - *very* low level BER decoding

SYNOPSIS
     use Convert::BER::XS ':all';

     my $ber = ber_decode $buf
        or die "unable to decode SNMP v1/v2c Message";

     my $msg = ber_is_seq $ber
        or die "SNMP message does not start with a sequence";

     ber_is $msg->[0], ASN_UNIVERSAL, ASN_INTEGER32, 0
        or die "SNMP message does not start with snmp version\n";

     if ($msg->[0][BER_DATA] == 0 || $msg->[0][BER_DATA] == 1) {
        # message is SNMP v1 or v2c

        if (ber_is $msg->[2], ASN_CONTEXT, 4, 1) {
           # message is v1 trap
           my $trap = $msg->[2][BER_DATA];

           # check whether trap is a cisco mac notification mac changed message
           if (
              (ber_is_oid $trap->[0], "1.3.6.1.4.1.9.9.215.2") # cmnInterfaceObjects
              and (ber_is_i32 $trap->[2], 6)
              and (ber_is_i32 $trap->[3], 1) # mac changed msg
           ) {
              ... and so on

DESCRIPTION
    This module implements a *very* low level BER/DER decoder, and in the
    future, probably also an encoder (tell me if you want an encoder, this
    might speed up the process of getting one).

    If is tuned for low memory and high speed, while still maintaining some
    level of user-friendlyness.

    Currently, not much is documented, as this is an initial release to
    reserve CPAN namespace, stay tuned for a few days.

AUTHOR
     Marc Lehmann <schmorp@schmorp.de>
     http://software.schmorp.de/pkg/Convert-BER-XS