perl agent problem with COUNTER64

HI, All:

I'am recently writing extension using perl. I've came across a problem with
ASN_COUNTER64 type.
when I use COUNTER64 to return a value, I will get a wired value from
snmpwalk.  The machine I used is X86_64 and perl was compiled to support a
64bit number.
Even when I uses setValue (ASN_COUNTER64, 1) ,  the value I get from
snmpwalk is quite large.

I've looked into the code of net-snmp-5.4.2.1 for some answers.
In "perl/agent/agent.xs:833-863":  it gets a numeric "utmp" from SvIV or
converts from a string. and call

snmp_set_var_typed_value(request->requestvb, (u_char)type,
                                       (u_char *) &utmp, sizeof(utmp));

I printed the value of "utmp", it was right.
then I followed into "snmp_set_var_value()" which called by
snmp_set_var_typed_value(), between line 916-925 handels COUNTER64 type:

 vars->val_len = sizeof(struct counter64);
 memmove(vars->val.counter64, value, vars->val_len);

It seemed directly copy the 64bit value into a struct counter64,
but I found the definition of struct counter64 in
"include/net-snmp/library/asn1.h"

   struct counter64 {
        u_long          high;
        u_long          low;
   };

In X86_64 platform sizeof (struct counter64) will be 16 (128bit), therefor
setValue (ASN_COUNTER64, 0x100000002),
might get :
high=0x100000002, low=unexpected value

If I change the definition of struct counter64 into

struct counter64 {
        uint32_t        low;
        uint32_t        high;
}

my perl extension which use counter64 will work, but other OIDs  like
IF-MIB::ifHCInOctets will be broken. the log was like:

snmp_build: unknown failuresend response: Error building ASN.1
representation (build uint64 size 16: s/b 8)
    -- ifHCInOctets.1

Do you have any suggestion? I would appreciate a quick solution because the
time I get for my project is limited.

-------------------

Best regards,
Neptune Ning

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