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POConverting EBCDIC to ASCII in java
 

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  1. POConverting EBCDIC to ASCII in java
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    <p>so I am supposed to convert an EBCDIC file to ASCII by using Java. So far I have this code: </p> <pre><code>public class Migration { InputStreamReader reader; StringBuilder builder; public Migration(){ try { reader = new InputStreamReader(new FileInputStream("C:\\TI3\\Legacy Systemen\\Week 3\\Oefening 3\\inputfile.dat"), java.nio.charset.Charset.forName("ibm500") ); } catch(FileNotFoundException e){ e.printStackTrace(); } builder = new StringBuilder(); } public void read() throws IOException { int theInt; while((theInt = reader.read()) != -1){ char theChar = (char) theInt; builder.append(theChar); } reader.close(); } @Override public String toString(){ return builder.toString(); } } </code></pre> <p>The file description is the following: </p> <pre><code> 02 KDGEX. 05 B1-LENGTH PIC S9(04) USAGE IS COMP. 05 B1-CODE PIC S9(04) USAGE IS COMP. 05 B1-NUMBER PIC X(08). 05 B1-PPR-NAME PIC X(06). 05 B1-PPR-FED PIC 9(03). 05 B1-PPR-RNR PIC S9(08) USAGE IS COMP. 05 B1-DATA. 10 B1-VBOND PIC 9(02). 10 B1-KONST. 20 B1-AFDEL PIC 9(03). 20 B1-KASSIER PIC 9(03). 20 B1-DATZIT-DM PIC 9(04). 10 B1-BETWYZ PIC X(01). 10 B1-RNR PIC X(13). 10 B1-BETKOD PIC 9(02). 10 B1-VOLGNR-INF PIC 9(02). 10 B1-QUAL-PREST PIC 9(03). 10 B1-REKNUM PIC 9(12). 10 B1-REKNR REDEFINES B1-REKNUM. 20 B1-REKNR-PART1 PIC 9(03). 20 B1-REKNR-PART2 PIC 9(07). 20 B1-REKNR-PART3 PIC 9(02). 10 B1-VOLGNR-M30 PIC 9(03). 10 B1-OMSCHR. 15 B1-OMSCHR1 PIC X(14). 15 B1-OMSCHR2 PIC X(14). 10 B1-OMSCHR-INF REDEFINES B1-OMSCHR. 15 B1-AANT-PREST PIC 9(02). 15 B1-VERSTR PIC 9(01). 15 B1-LASTDATE PIC 9(06). 15 B1-HONOR PIC 9(06). 15 B1-RIJKN PIC X(13). 10 FILLER--1 PIC 9(02). 10 B1-INFOREK PIC 9(01). 10 B1-BEDRAG-EUR PIC 9(08). 10 B1-BEDRAG-DV PIC X(01). 10 B1-BEDRAG-RMG-DV REDEFINES B1-BEDRAG-DV PIC X(01). 05 FILLER PIC X(5). </code></pre> <p>We can ignore the first 2 bytes on every line. The problem is the bytes where there's a USAGE IS COMP since the reader is not converting them properly, I think I am supposed to read these as bytes or something, though I have no idea how. </p>
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    1. COCOMP with 1-4 digits is a two-byte binary. COMP with 5-9 digits is a four-byte binary. It's coming from an IBM Mainframe (most likely) so it will be Big Endian, if that matters. X'0010' will be a value of 16, as will X'00000010'. All the other data is plain unsigned character data, so could be treated as big chunks of characters if more convenient. It *may* be that the first four bytes are not required. A variable-length record is preceded by two two-byte binary fields, containing length and zero. This may be a coincidence here.
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    2. COJust to add, that whoever gives you that file is making it more difficult for you. If *all* the fields that you need were plain character fields, the EBCDIC to ASCII conversion can just be done by whatever utility is giving you the file - you'd have no program to write, no wheel to re-invent.
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    3. COIf you can't get the change at the other end, here's an existing wheel http://stackoverflow.com/questions/17448008/convert-mainframe-binary-to-ascii-using-any-open-source-code-or-tool
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