Value representation of DPI SNMP value types

Values in the snmp_dpi_set_packet structure are represented as follows:

32-bit integers are defined as long int or unsigned long int. A long int is assumed to be 4 bytes.
64-bit integers are represented as an snmp_dpi_u64.
Unsigned 64 bit integers are dealt with only in SNMP. In a structure that has two fields, the high order piece and the low order piece, each is of type unsigned long int. These are assumed to be 4 bytes.
Object identifiers are null-terminated strings in the selected character set, representing the OID in ASN.1 dotted-decimal notation. The length includes the terminating NULL.
An ASCII example:
```
'312e332e362e312e322e312e312e312e3000'h
```
represents "1.3.6.1.2.1.1.1.0" which is sysDescr.0.
An EBCDIC example:
```
'f14bf34bf64bf14bf24bf14bf14bf14bf000'h
```
represents "1.3.6.1.2.1.1.1.0" which is sysDescr.0.
DisplayStrings are in the selected character set. The length specifies the length of the string.
An ASCII example:
```
'6162630d0a'h
```
represents "abc\r\n", no NULL.
An EBCDIC example:
```
'8182830d25'h
```
represents "abc\r\n", no NULL.
IpAddress and Opaque are implicit OCTET_STRING, so they are a sequence of octets or bytes. This means, for instance, that the IP address is in network byte order.
NULL has a 0 length for the value, no value data, so a NULL pointer is returned in the value_p field.
noSuchObject, noSuchInstance, and endOfMibView are implicit NULL and are represented as such.
BIT_STRING is an OCTET_STRING of the form uubbbb...bb, where the first octet (uu) is 0x00-0x07 and indicates the number of unused bits in the last octet (bb). The bb octets represent the bit string itself, where bit 0 comes first and so on.

See the following related information.

Value ranges and limits for DPI SNMP value types