 is receiving
a piece. <tt class="docutils literal">buf</tt> points (non-owning pointer) to the data in an
internal immutable disk buffer. The length of the data is specified
in the <tt class="docutils literal">length</tt> member of the <tt class="docutils literal">piece</tt> parameter.
returns true to indicate that the piece is handled and the
rest of the logic should be ignored.</p>
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