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diff --git a/subversion/include/private/svn_magic.h b/subversion/include/private/svn_magic.h
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+++ b/subversion/include/private/svn_magic.h
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+/**
+ * @copyright
+ * ====================================================================
+ *    Licensed to the Apache Software Foundation (ASF) under one
+ *    or more contributor license agreements.  See the NOTICE file
+ *    distributed with this work for additional information
+ *    regarding copyright ownership.  The ASF licenses this file
+ *    to you 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.
+ * ====================================================================
+ * @endcopyright
+ *
+ * @file svn_magic.h
+ * @brief Subversion interface to libmagic.
+ */
+
+#ifndef SVN_MAGIC_H
+#define SVN_MAGIC_H
+
+/* An opaque struct that wraps a libmagic cookie. */
+typedef struct svn_magic__cookie_t svn_magic__cookie_t;
+
+/* This routine initialises libmagic.
+ * Upon success a new *MAGIC_COOKIE is allocated in RESULT_POOL.
+ * On failure *MAGIC_COOKIE is set to NULL.
+ * All resources used by libmagic are freed by a cleanup handler
+ * installed on RESULT_POOL, i.e. *MAGIC_COOKIE becomes invalid when
+ * the pool is cleared! */
+void
+svn_magic__init(svn_magic__cookie_t **magic_cookie,
+                apr_pool_t *result_pool);
+
+/* Detect the mime-type of the file at LOCAL_ABSPATH using MAGIC_COOKIE.
+ * If the mime-type is binary return the result in *MIMETYPE.
+ * If the file is not a binary file or if its mime-type cannot be determined
+ * set *MIMETYPE to NULL. Allocate *MIMETYPE in RESULT_POOL.
+ * Use SCRATCH_POOL for temporary allocations. */
+svn_error_t *
+svn_magic__detect_binary_mimetype(const char **mimetype,
+                                  const char *local_abspath,
+                                  svn_magic__cookie_t *magic_cookie,
+                                  apr_pool_t *result_pool,
+                                  apr_pool_t *scratch_pool);
+
+#endif /* SVN_MAGIC_H */