[SNMP4J] UTF Encoding Support

[fock at agentpp.com]

Hi,

I have already written it: the MIB specification
has to define which character set is used for
a variable binding.

To get the OctetString value never use toString().
Instead use getValue()/toByteArray().

Best regards,
Frank 

 
Hi Frank,

I took a look at the toString() method of OctetString that is like below.
  public String toString() {
    if (isPrintable()) {
      return new String(value);
    }
    return toHexString();
  }

  public boolean isPrintable() {
    for (int i=0; i<value.length; i++) {
      char c = (char)value[i];
      if ((Character.isISOControl(c) ||
          ((value[i] & 0xFF) >= 0x80)) && (!Character.isWhitespace(c))) {
        return false;
      }
    }
    return true;
  }

So if the value byte array contains Chinese chars, it will not display the correct Chinese chars and will display the hexadecimal values. You know, in order to display the Chinese chars correctly, I have to do some encoding converting just like this.  
new String(((OctetString) vb[i].getVariable()).toByteArray(), "gb2312");
After done that, the chinese chars will be correctly displayed. Therefore, I guess if the value byte array contains Japanese chars, I will also have to use a Japanese charset to reconstruct the text. Same process will be needed for other chars such as German, French and so on.

My problem is that I am writing a snmp trap receive client and I can't know which chars the snmp trap sender(such as cisco router and some kinds of firewall) will use by advance. So in this case, I have to guess which charsets the snmp trap sender are using. Do you have any suggestion for this case? Thanks.


Eternal





2009/1/2 Frank Fock <fock at agentpp.com>
Hi,

OctetString does not "use" any encoding. As the name
suggests, it represents an octet string which is
a (binary) string of 8-bit bytes.

If you convert an OctetString to a String, UTF-8 is
used by default (Java does that). You are responsible
to use the correct format as specified in the
corresponding MIB specification of the object.

Regards,
Frank




karunakaran s.l wrote:
Hi All,

           I want to know the snmp4j's  "OctetString" uses the UTF encoding
or not.

If it uses the UTF Encoding means what is encoding type (8 or 16). If not
using UTF encoding means is any other way of using UTF Encoding for setting
the MO Values of type OctetString. (Example: UTF encoding for sysLocation).

Please clarify this as soon as possible.


Thanks
Karunakaran
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