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diff --git a/libopenjpeg/tgt.h b/libopenjpeg/tgt.h
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+/*
+ * Copyright (c) 2001-2002, David Janssens
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __TGT_H
+#define __TGT_H
+
+typedef struct tgt_node {
+	struct tgt_node *parent;
+	int value;
+	int low;
+	int known;
+} tgt_node_t;
+
+typedef struct {
+	int numleafsh;
+	int numleafsv;
+	int numnodes;
+	tgt_node_t *nodes;
+} tgt_tree_t;
+
+/*
+ * Create a tag-tree
+ * numleafsh: width of the array of leafs of the tree
+ * numleafsv: height of the array of leafs of the tree
+ */
+tgt_tree_t *tgt_create(int numleafsh, int numleafsv);
+
+/*
+ * Reset a tag-tree (set all leafs to 0)
+ * tree: tag-tree to reset
+ */
+void tgt_reset(tgt_tree_t * tree);
+
+/*
+ * Destroy a tag-tree, liberating memory
+ * tree: tag-tree to destroy
+ */
+void tgt_destroy(tgt_tree_t * tree);
+
+/*
+ * Set the value of a leaf of a tag-tree
+ * tree: tag-tree to modify
+ * leafno: number that identifies the leaf to modify
+ * value: new value of the leaf
+ */
+void tgt_setvalue(tgt_tree_t * tree, int leafno, int value);
+
+/*
+ * Encode the value of a leaf of the tag-tree up to a given threshold
+ * leafno: number that identifies the leaf to encode
+ * threshold: threshold to use when encoding value of the leaf
+ */
+void tgt_encode(tgt_tree_t * tree, int leafno, int threshold);
+
+/*
+ * Decode the value of a leaf of the tag-tree up to a given threshold
+ * leafno: number that identifies the leaf to decode
+ * threshold: threshold to use when decoding value of the leaf
+ */
+int tgt_decode(tgt_tree_t * tree, int leafno, int threshold);
+
+#endif