1 files changed, 63 insertions, 0 deletions
diff --git a/lib/util/idtree.h b/lib/util/idtree.h
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+++ b/lib/util/idtree.h
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+/*
+   Unix SMB/CIFS implementation.
+
+   very efficient functions to manage mapping a id (such as a fnum) to
+   a pointer. This is used for fnum and search id allocation.
+
+   Copyright (C) Andrew Tridgell 2004
+
+   This code is derived from lib/idr.c in the 2.6 Linux kernel, which was
+   written by Jim Houston jim.houston@ccur.com, and is
+   Copyright (C) 2002 by Concurrent Computer Corporation
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _SAMBA_IDTREE_H_
+#define _SAMBA_IDTREE_H_
+
+#include <talloc.h>
+
+struct idr_context;
+
+/**
+  initialise a idr tree. The context return value must be passed to
+  all subsequent idr calls. To destroy the idr tree use talloc_free()
+  on this context
+ */
+struct idr_context *idr_init(TALLOC_CTX *mem_ctx);
+
+/**
+  allocate the next available id, and assign 'ptr' into its slot.
+  you can retrieve later this pointer using idr_find()
+*/
+int idr_get_new(struct idr_context *idp, void *ptr, int limit);
+
+/**
+   allocate a new id, giving the first available value greater than or
+   equal to the given starting id
+*/
+int idr_get_new_above(struct idr_context *idp, void *ptr, int starting_id, int limit);
+
+/**
+  find a pointer value previously set with idr_get_new given an id
+*/
+void *idr_find(struct idr_context *idp, int id);
+
+/**
+  remove an id from the idr tree
+*/
+int idr_remove(struct idr_context *idp, int id);
+
+#endif /* _SAMBA_IDTREE_H_ */