--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/include/mupdf/fitz/tree.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,62 @@
+// Copyright (C) 2004-2021 Artifex Software, Inc.
+//
+// This file is part of MuPDF.
+//
+// MuPDF is free software: you can redistribute it and/or modify it under the
+// terms of the GNU Affero General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option)
+// any later version.
+//
+// MuPDF 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 Affero General Public License for more
+// details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
+//
+// Alternative licensing terms are available from the licensor.
+// For commercial licensing, see <https://www.artifex.com/> or contact
+// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
+// CA 94129, USA, for further information.
+
+#ifndef MUPDF_FITZ_TREE_H
+#define MUPDF_FITZ_TREE_H
+
+#include "mupdf/fitz/system.h"
+#include "mupdf/fitz/context.h"
+
+/**
+	AA-tree to look up things by strings.
+*/
+
+typedef struct fz_tree fz_tree;
+
+/**
+	Look for the value of a node in the tree with the given key.
+
+	Simple pointer equivalence is used for key.
+
+	Returns NULL for no match.
+*/
+void *fz_tree_lookup(fz_context *ctx, fz_tree *node, const char *key);
+
+/**
+	Insert a new key/value pair and rebalance the tree.
+	Return the new root of the tree after inserting and rebalancing.
+	May be called with a NULL root to create a new tree.
+
+	No data is copied into the tree structure; key and value are
+	merely kept as pointers.
+*/
+fz_tree *fz_tree_insert(fz_context *ctx, fz_tree *root, const char *key, void *value);
+
+/**
+	Drop the tree.
+
+	The storage used by the tree is freed, and each value has
+	dropfunc called on it.
+*/
+void fz_drop_tree(fz_context *ctx, fz_tree *node, void (*dropfunc)(fz_context *ctx, void *value));
+
+#endif