How to parse a Visa BER TLV field to tag level and define field packager for it?

[Adnan Sohail]

Hi,

I am getting problem while parsing Visa BER TLV field like Field 55, 104 and 123 to tag level. However I have been able to parse the complete field value, but unable to extract list of tags within each dataset.

Can anyone help me achieve that?

Regards,

Adnan Sohail

[chhil]

There is a tlvlist object that jpos provides, use it. 

-chhil

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[Adnan Sohail]

I have tried using it but its unable to parse data sets of a BER TLV. For example, while parsing Visa Field-55 with value [01005E9F3303E02080950500000000009F3704A5CC06CF9F100706010A03A0B0009F26080562599501ED00039F3602010C82025C009F3704A5CC06CF9F3704A5CC06CF9F3704A5CC06CF9F02060000000010005F2A0208409F0306000000000000] using below code, I am getting below exception:

Can you please what is wrong I am doing in below Code Snippet:

TLVList list = new TLVList();

list.unpack(ISOUtil.hex2byte(fieldValue));

List<TLVMsg> tags = list.getTags();

for (TLVMsg tlv : tags) {

lgr.debug("Value of FieldID-{}, Tag [{}], Value [{}] is parsed as: ", () -> fieldId, () -> tlv.getTag(), () -> ISOUtil.byte2hex(tlv.getValue()));

}

Exception:

java.lang.NegativeArraySizeException: -1342136538

at org.jpos.tlv.TLVList.getTLVMsg(TLVList.java:369) ~[jpos-2.1.3.jar:2.1.3]

at org.jpos.tlv.TLVList.unpack(TLVList.java:193) ~[jpos-2.1.3.jar:2.1.3]

at org.jpos.tlv.TLVList.unpack(TLVList.java:163) ~[jpos-2.1.3.jar:2.1.3]

--

Adnan 

On Tuesday, 1 October 2019 15:35:53 UTC+5, chhil wrote:

There is a tlvlist object that jpos provides, use it. 

-chhil

On Tue, Oct 1, 2019, 3:35 PM Adnan Sohail <adnaan...@gmail.com> wrote:

Hi,

I am getting problem while parsing Visa BER TLV field like Field 55, 104 and 123 to tag level. However I have been able to parse the complete field value, but unable to extract list of tags within each dataset.

Can anyone help me achieve that?

Regards,

Adnan Sohail

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[chhil]

Your data does not appear to be standard ber tlv.

-chhil

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[chhil]

If I remove the data upto 9F and process it, it works. You will need to read your spec to see what that additional data is. BTW I am not TLV expert, just hacking your data).

        String fieldValue = "9F3303E02080950500000000009F3704A5CC06CF9F100706010A03A0B0009F26080562599501ED00039F3602010C82025C009F3704A5CC06CF9F3704A5CC06CF9F3704A5CC06CF9F02060000000010005F2A0208409F0306000000000000";
        list.unpack(ISOUtil.hex2byte(fieldValue));

        list.dump(System.out, "");

Output

<tlvlist>
   <tag id='9f33' value='E02080' />
   <tag id='95' value='0000000000' />
   <tag id='9f37' value='A5CC06CF' />
   <tag id='9f10' value='06010A03A0B000' />
   <tag id='9f26' value='0562599501ED0003' />
   <tag id='9f36' value='010C' />
   <tag id='82' value='5C00' />
   <tag id='9f37' value='A5CC06CF' />
   <tag id='9f37' value='A5CC06CF' />
   <tag id='9f37' value='A5CC06CF' />
   <tag id='9f02' value='000000001000' />
   <tag id='5f2a' value='0840' />
   <tag id='9f03' value='000000000000' />
</tlvlist>

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[Adnan Sohail]

Thanks chhil,

I figured the same problem. I guess I need to parse Data Set IDs my self and then TLVs within a DataSet will be parsed using TLVList.

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Adnan Sohail

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[Chhil]

In another thread that you had created, a user has provided a packager that handles data set id. Though I am not sure how that will work for multiple data set ids.

 

-chhil

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[Mark S]

I would check the spec first to make sure where the TLV data in a Visa message actually starts.

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Mark

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From: jpos-...@googlegroups.com <jpos-...@googlegroups.com> on behalf of Adnan Sohail <adnaan...@gmail.com>
Sent: Thursday, October 3, 2019 12:28:46 PM
To: jPOS Users <jpos-...@googlegroups.com>

Subject: Re: [jpos-users] How to parse a Visa BER TLV field to tag level and define field packager for it?

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[Adnan Sohail]

Although I haven't tried that packager but I am not sure whether that packager would work. Because a BER TLV field contains as many datasets as possible and each data set can contain multiple TLVs. So, I doubt that packager would work for it.

Anyhow, I have figured out a solution already with little manual work.

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[Kogan Moonsamy]

Hi,

As Chhil mentioned a few mails above, I have replied to your other post with part of my packager. I have just implemented a VISA SMS switch into production, so it works.

As for your implementation of the TLVList, its probably not working because your packager is incorrect.

Regards

Kogan

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