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diff --git a/lib/isc/include/isc/bufferlist.h b/lib/isc/include/isc/bufferlist.h
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+++ b/lib/isc/include/isc/bufferlist.h
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+/*
+ * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 1999-2001  Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* $Id: bufferlist.h,v 1.17 2007/06/19 23:47:18 tbox Exp $ */
+
+#ifndef ISC_BUFFERLIST_H
+#define ISC_BUFFERLIST_H 1
+
+/*****
+ ***** Module Info
+ *****/
+
+/*! \file isc/bufferlist.h
+ *
+ *
+ *\brief	Buffer lists have no synchronization.  Clients must ensure exclusive
+ *	access.
+ *
+ * \li Reliability:
+ *	No anticipated impact.
+
+ * \li Security:
+ *	No anticipated impact.
+ *
+ * \li Standards:
+ *	None.
+ */
+
+/***
+ *** Imports
+ ***/
+
+#include <isc/lang.h>
+#include <isc/types.h>
+
+ISC_LANG_BEGINDECLS
+
+/***
+ *** Functions
+ ***/
+
+unsigned int
+isc_bufferlist_usedcount(isc_bufferlist_t *bl);
+/*!<
+ * \brief Return the length of the sum of all used regions of all buffers in
+ * the buffer list 'bl'
+ *
+ * Requires:
+ *
+ *\li	'bl' is not NULL.
+ *
+ * Returns:
+ *\li	sum of all used regions' lengths.
+ */
+
+unsigned int
+isc_bufferlist_availablecount(isc_bufferlist_t *bl);
+/*!<
+ * \brief Return the length of the sum of all available regions of all buffers in
+ * the buffer list 'bl'
+ *
+ * Requires:
+ *
+ *\li	'bl' is not NULL.
+ *
+ * Returns:
+ *\li	sum of all available regions' lengths.
+ */
+
+ISC_LANG_ENDDECLS
+
+#endif /* ISC_BUFFERLIST_H */