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  Routine:      CBL_READ_VFILE
 
  Function:     Reads bytes from a heap.
 
  Syntax:       CALL "CBL_READ_VFILE" USING BY VALUE     heap-id
                                                         heap-ref
                                                         heap-len
                                            BY REFERENCE heap-buf
 
  Parameters:   heap-id                PIC X(2) COMP-5.
                heap-ref               PIC X(4) COMP-5.
                heap-len               PIC X(4) COMP-5.
                heap-buf               PIC X(n).
                                    -♦-