CODEWITHSUNDEEP
asciimainframeebcdicpacked-decimal
Michael Ouyang
Michael Ouyang

Reputation: 1827

How to unpack COMP digits using Java?

I had found this useful link for unpacked COMP-3 digit, but i need to unpack COMP digit this time, is anyone know how to unpack it? Thanks a lot!

Upvotes: 4

Views: 500

Answers (2)

Hogstrom
Hogstrom

Reputation: 3761

IBM Provides a library of Java methods to simplify interactions with z/OS services and data formats. An overview can be found here jZOS Toolkit

Here is a link to PackedDecimal Operations

Here are others for managing binary data ByteArrayUnmarshaller

Upvotes: 1

Bruce Martin
Bruce Martin

Reputation: 10543

In most Cobol compilers Comp is a big endian binary integer. For the mainframe only 2/4/8 bytes are supported. So For signed values 

  03  Signed-Num     pic s9(4) comp.

if you have the value in an array of bytes you can do

BigInteger value = new BigInteger(byteArray);

Alternatively you could use the readShort(), readInt() and readLong() methods of DataInputStream

Finally JRecord will let you read Cobol files with a Cobol copybook

Upvotes: 1

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