<div class="content" name="FRS_RDC_SOURCE_NEED" uuid="5cce1f99-a5a6-4b34-b1e1-9a089c1de311"><p>A file range specification for <a href="81169399-de63-4f92-8da0-91bd31e3c24c#gt_a0d8116e-63f3-418b-afea-ca6258840e92" data-linktype="relative-path">RDC</a> downloads.</p><dl>
<dd>
<div><pre> typedef struct _FRS_RDC_SOURCE_NEED {
   ULONGLONG needOffset;
   ULONGLONG needSize;
 } FRS_RDC_SOURCE_NEED;
</pre></div>
</dd></dl><p><b>needOffset:</b>  The offset in the
marshaled source file.</p><p><b>needSize:</b>  The number of data
(uncompressed), in <a href="../ms-dtyp/267d9549-6f9d-48ed-8250-cc6cfc51b44d" data-linktype="relative-path">bytes</a>,
to retrieve.</p><p>The client uses this structure to request source data from
the server when downloading a file with RDC.</p></div>