This section describes the total length of data returned within a given header. Inspect the section type field to determine what kind of data are returned within this header.

In addition, the mapping for the common prefix section (JDCXPREF) can be used to access common fields at the top of all sections. The caller can navigate through the sections using these common fields and checking section types and modifiers without having to look inside data sections which are not relevant.

Field Name

Description

JDCXLNG

In a prefix section—the total length of all sections for this header (not including the length of the header). In all other sections—the length of that section.

JDCXTYPE

Section type

JDCXMOD

Section type modifier (0 for the prefix section)

JDCXDATA

Beginning of the section-unique data (the prefix sections do not have data)