CA Compress/2 › Using CA Compress/2 Under CICS › CA Compress/2 Subroutines Under CICS

CA Compress/2 Subroutines Under CICS

CA Compress/2 for CICS provides two subroutines for processing compressed data in CICS application programs. Each application program must be link edited with the module SHRKCICS (rather than with SHRKSTUB or SHRKEXPD, as specified earlier in this chapter for CA Compress/2). The subroutines are as follows:

SHRINK

Converts an uncompressed record image to compressed form.

EXPAND

Converts a record image to its original uncompressed form.

Note: The called subroutines from the application modify storage obtained by the startup module, SHRNKMOD. Unless disabled, Intertest will issue a breakpoint on these instructions. Proceed and disregard the breakpoint. One such instruction that will cause a breakpoint is located at label SE in the CSECT SHRKCICS.

These differ slightly from the subroutines with these names in CA Compress/2:

• The 5 arguments passed to the SHRINK or EXPAND subroutines must be preceded by the EIB and a dummy DFHCOMMAREA, as required by command level CICS.
• The fourth parameter must be an SCB.

Because the CA Compress/2 subroutines modify the SCB, it must be in transaction-related dynamic storage. The SCB should be specified as documented in the section Accessing the FDT in this chapter.