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diff --git a/src/libserver/css/css_util.hxx b/src/libserver/css/css_util.hxx
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+/*-
+ * Copyright 2021 Vsevolod Stakhov
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#ifndef RSPAMD_CSS_UTIL_HXX
+#define RSPAMD_CSS_UTIL_HXX
+
+#include <string_view>
+#include "mem_pool.h"
+
+namespace rspamd::css {
+
+/*
+ * Unescape css escapes
+ * \20AC : must be followed by a space if the next character is one of a-f, A-F, 0-9
+ * \0020AC : must be 6 digits long, no space needed (but can be included)
+ */
+std::string_view unescape_css(rspamd_mempool_t *pool,
+							  const std::string_view &sv);
+
+}// namespace rspamd::css
+
+#endif//RSPAMD_CSS_UTIL_HXX