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<!DOCTYPE concept

  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-2F987147-1435-55F1-B61C-8413C4AD8424" xml:lang="en"><title>Direct

File Store Structure</title><shortdesc>Describes the structure of the file used as a Direct File Store.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>The general structure of a direct file store, from the point of view of

the physical file containing the store, is illustrated below.</p>

<fig id="GUID-B9A986BB-322A-5432-BB12-92B1934954B6">

<image href="GUID-D15068B5-D12E-5515-A772-EA3B304EE01E_d0e354923_href.png" placement="inline"/>

</fig>

<p>The header is the content of the descriptor returned by the <codeph>Des()</codeph> member

function of <codeph>TCheckedUid</codeph>; this contains the file store type

and checksum; the length of the data is the size of a <codeph>TCheckedUid</codeph> object.

Note that <codeph>TCheckedUid</codeph> is not part of the public API.</p>

<p>The header is followed by the root stream ID. As the value of a stream

ID is also the offset of that stream from the start of the host, this gives

the offset of the root stream.</p>

<p>The root stream ID is followed by all the streams; the root stream is the

last stream.</p>