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diff --git a/src/libdnssec/contrib/vpool.h b/src/libdnssec/contrib/vpool.h
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+/*
+ * Copyright (c) 2006, 2008 Alexey Vatchenko <av@bsdua.org>
+ *
+ * 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 THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
+ */
+
+/*
+ * VPool: implementation of pool of data with a variable size.
+ */
+#ifndef _VPOOL_H_
+#define _VPOOL_H_
+
+#include <stddef.h>
+#include <limits.h>
+
+struct vpool {
+ void *v_basebuf; /* pointer returned by (re|m)alloc() */
+ void *v_buf; /* actual data starts here */
+ size_t v_off;
+ size_t v_size;
+
+ size_t v_blksize;
+ size_t v_limit;
+ int v_lasterr;
+};
+
+enum vpool_trunc {VPOOL_EXCLUDE, VPOOL_INCLUDE};
+#define VPOOL_TAIL UINT_MAX
+
+void vpool_init(struct vpool *pool, size_t blksize, size_t limit);
+void vpool_final(struct vpool *pool);
+
+void vpool_reset(struct vpool *pool);
+void vpool_wipe(struct vpool *pool);
+
+void * vpool_insert(struct vpool *pool,
+ size_t where, void *data, size_t datsize);
+void * vpool_expand(struct vpool *pool, size_t where, size_t size);
+
+int vpool_truncate(struct vpool *pool,
+ size_t where, size_t size, enum vpool_trunc how);
+
+#define vpool_is_empty(pool) ((pool)->v_off == 0)
+#define vpool_get_buf(pool) ((pool)->v_buf)
+#define vpool_get_length(pool) ((pool)->v_off)
+#define vpool_get_error(pool) ((pool)->v_lasterr)
+
+void vpool_export(struct vpool *pool, void **buf, size_t *size);
+
+#endif /* !_VPOOL_H_ */