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diff --git a/src/util/UriRelative.hxx b/src/util/UriRelative.hxx
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+++ b/src/util/UriRelative.hxx
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+/*
+ * Copyright 2008-2019 Max Kellermann <max.kellermann@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - 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
+ * FOUNDATION 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 URI_RELATIVE_HXX
+#define URI_RELATIVE_HXX
+
+#include "Compiler.h"
+
+#include <string>
+
+/**
+ * Check whether #child specifies a resource "inside" the directory
+ * specified by #parent.  If the strings are equal, the function
+ * returns false.
+ */
+gcc_pure gcc_nonnull_all
+bool
+uri_is_child(const char *parent, const char *child) noexcept;
+
+gcc_pure gcc_nonnull_all
+bool
+uri_is_child_or_same(const char *parent, const char *child) noexcept;
+
+/**
+ * Translate the given URI in the context of #base.  For example,
+ * uri_apply_base("foo", "http://bar/a/")=="http://bar/a/foo".
+ */
+gcc_pure
+std::string
+uri_apply_base(const std::string &uri, const std::string &base) noexcept;
+
+#endif