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diff --git a/subversion/include/svn_quoprint.h b/subversion/include/svn_quoprint.h
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+++ b/subversion/include/svn_quoprint.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_quoprint.h
+ * @brief quoted-printable encoding and decoding functions.
+ */
+
+#ifndef SVN_QUOPRINT_H
+#define SVN_QUOPRINT_H
+
+#include <apr_pools.h>
+
+#include "svn_string.h"  /* for svn_strinbuf_t */
+#include "svn_io.h"      /* for svn_stream_t */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/** Return a writable generic stream which will encode binary data in
+ * quoted-printable format and write the encoded data to @a output.  Be
+ * sure to close the stream when done writing in order to squeeze out
+ * the last bit of encoded data.
+ */
+svn_stream_t *
+svn_quoprint_encode(svn_stream_t *output,
+                    apr_pool_t *pool);
+
+/** Return a writable generic stream which will decode binary data in
+ * quoted-printable format and write the decoded data to @a output.  Be
+ * sure to close the stream when done writing in order to squeeze out
+ * the last bit of encoded data.
+ */
+svn_stream_t *
+svn_quoprint_decode(svn_stream_t *output,
+                    apr_pool_t *pool);
+
+
+/** Simpler interface for encoding quoted-printable data assuming we have all
+ * of it present at once.  The returned string will be allocated from @a pool.
+ */
+svn_stringbuf_t *
+svn_quoprint_encode_string(const svn_stringbuf_t *str,
+                           apr_pool_t *pool);
+
+/** Simpler interface for decoding quoted-printable data assuming we have all
+ * of it present at once.  The returned string will be allocated from @a pool.
+ */
+svn_stringbuf_t *
+svn_quoprint_decode_string(const svn_stringbuf_t *str,
+                           apr_pool_t *pool);
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* SVN_QUOPRINT_H */