Find a best practice for integrating technologies in ibm redbooks. Use cobol copybooks in ibm rational integration tester to test cobol data files or the applications that produce and consume them. Before writing your business rules, you identify the data structures on which you want to write and manage rules outside of your cobol application. Discusses several types of character and binary numeric fields, and the handling of signs and decimal points. I have 2 variables as given below in my input file. Ebcdic and ascii is required it will need to be done after the file transfer. In my case, the record types are fixed length no occurs depending clauses in the copybooks, but different record types have different lengths. Ebcdic and ascii differences, cobol copybook layouts, redefines and occurs clauses, and. I asked you this question becasue of redefine clause in the cobol copy book. Packeddecimal format means that each byte of storage except for the low order byte can contain two decimal numbers. If you need more detail, please refer to one of the many fine cobol books. Currently, floatingpoint comp2 fields are not supported. Note the following as you use the cobol copy books.
Packed decimal fields does not display a printable sign. If your copybook does not contain any packed decimal or computational fields and has ordinary strings and numbers as datatypes, the existing cb2xml will fit your requirements right away. But this utility will fail while running with comp3 packed data. I want a label for every field and data to be under it in the output file. Cobol compressed packed decimal conversion sas support. For example, a packeddecimal item is checked for hexadecimal values x0 through x9 in the digit positions and for a valid sign value in the sign position whether separate or nonseparate. The following table represents decimal digits from 0 to 9 in various bcd systems. This is an overview of the numeric, packeddecimal format also referred to as a packed. Integer or packed decimal, length see comp and comp3 definitions above.
The position of the failure in the input data starting from the first record is 90 is just after the area recsourcecode. Packeddecimal items occupy 1 byte of storage for every two decimal digits you code in the picture description, except that the rightmost byte contains only one digit and the sign. The cobol connection, examples and reference material. Data division is used to define the variables used in a program. The programs, both source code and documentation, simple and complex, are included in a zip file for easy downloading. The intent is to provide changes as the need arises and in a timeframe that is. In storage, your value of 15000 would be represented as x0015000d. Packed decimal format means that the file was transferred from a zos ebcdic system and the data was converted to ascii.
Packed decimal an item with cobol usage comp3 or packeddecimal. The method here can be referred to as simple binarycoded decimal sbcd or bcd 8421. You can use cobol copybooks to construct messages in a format that is meaningful to the system under test. Part 5, tables and occurs, introduces tables and the occurs and occurs. I am reporting from a fixed format flat file that contains packed decimal fields dates and dollar values. If the usage clause is not specified at either the group or elementary level, it is assumed to be display. Field name concatenated names based on level hierarchy data type integer, float, double or bcd field length implied decimal position unitbased, i. Since the file has variable record lengths, and the vendor sends it with packeddecimal data on it, its much easier to. I got utility written in java which unpacks pd data into long and packs it again. The copybook input step reads binary data files that are mapped by a fixed length cobol copybook definition file. The corresponding positive value would be x0015000c. Cobol copybook types that map to java data types ibm.
Help on packeddecimal fields needed i have written a cobol program that reads a file and creates a tabbed delimited file of all the fields for me to import into access or excel. I assume your question is actually how to convert one format into another format, in your case going from a string representation of a number to a packed format of that number. External decimal both zoned decimal and national decimal data items are. Movement of x19 to comp3 packed decimal by gurvinder23. Since each digit 09 in a number can be represented by 4 bits a halfbyte, or nibble, every two digits can be packed into one byte 8. The process of adding the packed field to zero giving a result in a display field is the same as doing an unpack of the packed field into a zoneddecimal or display field. A cobol copybook is a section of code that defines the data structures of cobol programs. As the fields are read in, some of the unpacked results read out to the equivalent of hex values 00 or 1a, and therefore my data step thinks it is at the end of a row prematurely.
You use this information to identify all the cobol data items required to write your business rules. Also, the actual physical length for group items, packed fields, binary fields and tables is not explicitly defined. Viewed it through file aid along with input files copy book questions. Packeddecimal format, description and discussion simotime. Presents some simple cobol layouts and introduces the concept of groups. The minus signs do not mean that the mantissa and exponent must.
I want to unpack above packed decimal data before writing in to my output file. The fc sign change occurs in a field which was apparently initialized in. For example, the position of a field within a record is not easily determined from the cobol copy file. Convert a mainframe ebcdic file from cobol copybook format to pc format in less than 60 seconds. Python application logic can be used to disentangle the various record types encoded via redefines clauses. Unpack cobol packed fields during ftp if i remember my cobol right, a comp3 has 4 bits per digit 2 digits per byte and the last digit is a overpunch of the sign. Im importing a file from cobol into sas and am encountering a problem with two packed decimal fields in the conversion. Find a best practice for integrating technologies in ibm redbooks explore. Some packed decimal fields are in these repeating groups, some are not. Variable record types such as vb, vbs, occurs depending on are not. How can i convert decimal value to packed format java in. Copybook format specifies the format of the copybook source.
Ebcdic layout and conversion primer greenview data. Occurs depending on this will set the elements occurs minimum and maximum. This information is calculated and provided by the simotime record layout utility program. External decimal both zoned decimal and national decimal data items. The binarycoded decimal scheme described in this article is the most common encoding, but there are many others. Data names must be defined in the data division before using them in the procedure division. Tables and occurs a powerful feature of cobol is the use of tables, via the occurs and occurs depending on clauses. The focus is on the usage of the mainframe or micro focus cobol pic 9. Convert packed, zoned and binary fields, including unisys packed decimal. Unfortunately, what that means for any binary or packeddecimal or floatingpoint fields you wont see much of the last, but they are comp1comp2 is that convert means potentially scrambled, because the coversion is assuming individual bytes, with simple byte values, whereas all of those fields have conventional coding, either through. This section describes cobol tables and the occurs and occurs depending on clauses, both of which cause fields or groups to repeat some number of times. A copybook may be included in more than one cobol program, and a program may include more than one copybook.
For example, pic s95 packeddecimal represents five digits. Cobol numeric formats, convert numeric formats using cobol. Refer to the cobol routine for example101 and view the cobol source code for this numeric field conversion example. The cobol connection provides a suite of cobol programs that describe and demonstrate various programming or coding techniques. The structure level 1 name is the resource table format name such as, emasstrt. Data item is stored in packed decimal format in comp3.
There was, perhaps, a change of the copy used by the programm cobol which writes your incomming file, then a difference with the cobol copy book used in bw. The loworder byte contains one digit in the leftmost portion and the sign positive or negative in the rightmost portion. The copybook input step reads binary data files that are mapped by a fixedlength cobol copybook definition file. Cobol file conversion to readable format all other. For packeddecimal fields, with an even picture clause, except for 918.
This format is most efficient when you code an odd number of digits in the picture description, so that the leftmost byte is fully used. The packed length value is supplied by the variable lfield. Discusses what redefined fields are and how they are used. You might be getting soc7 because comp3 variable contains packed decimal values and the one variable you are adding with contains numeric data.
Packed decimal, sometimes called packed binarycodeddecimal bcd or comp3, is a scheme used for decades in ibm and other mainframe computers to reduce the number of bytes it takes to represent numbers. Cobol copybooks can be added to ibm rational integration tester and applied to messages. The numeric formats like int, long etcetera are all stored packed write them to a. I have a record layout that is initialized in program 1, and then passes though various programs. Copy book fields are internally redefined so that they use the same space to store but when they get redefined they are defined with different data types. For attributes that describe indicators, subordinate 88 levels are used. The attribute names are used as subordinate level names. Below is a muchreduced, muchsimplified copy of the mfd ive created. Although i do not know of any prebuilt utility, perl is quite capable of parsing text data see packunpack function. Convert mainframe cobol ebcdic data to xml, csv or tab in. Reading cobol layouts ibm data conversion services. For zoned decimal and packeddecimal items, the numeric class test is affected by the numproc compiler option and the numcls option which is set at. Actually i am getting this packed decimal data from mainframe data files. It is necessary to supply the field length because when lua encounters binary zeros common in packed decimal, they are treated as an end of record indicator.
A cobol copybook is a file that contains cobol source code and is used to synchronize that code among various cobol programs. This article gives you enough information to read most simple cobol layouts. Cobol data layout cobol layout is the description of use of each field and the values present in it. Packeddecimal an item with cobol usage comp3 or packeddecimal. Many of the programs were created and continue to run on an ibm mainframe system and are sometimes referred to as legacy systems. It occurs when you try to move a nonnumeric data into a numeric data item.
I have a file which i dont know the copybook if we do hex. Packed decimal comp3 sign convention, select how comp3 packed decimals are parsed from the binary. Please suggest how to handle below scenario in cobol. For the packed decimal representation listed above, x indicates the number of digits represented, and w is the number of bytes. A cobol copybook is a selection of code that defines data structures. With the copy book and the dde module, a python program can then rewrite a cobol file. I want to convert numeric string 12345 10 byte into packed decimal format in one cobol program, and in another cobol program same packed decimal value converted back to string 12345 10 byte i tried with below logic converting string to packed.