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+//
+// VMime library (http://www.vmime.org)
+// Copyright (C) 2002 Vincent Richard <vincent@vmime.org>
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 3 of
+// the License, or (at your option) any later version.
+//
+// This program 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
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, write to the Free Software Foundation, Inc.,
+// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+//
+// Linking this library statically or dynamically with other modules is making
+// a combined work based on this library. Thus, the terms and conditions of
+// the GNU General Public License cover the whole combination.
+//
+
+#ifndef VMIME_WORDENCODER_HPP_INCLUDED
+#define VMIME_WORDENCODER_HPP_INCLUDED
+
+
+#include "vmime/charset.hpp"
+
+
+namespace vmime {
+
+
+namespace utility {
+namespace encoder {
+
+class encoder;
+
+} // encoder
+} // utility
+
+
+/** Encodes words according to RFC-2047.
+ */
+class VMIME_EXPORT wordEncoder {
+
+public:
+
+ /** Available encodings for RFC-2047. */
+ enum Encoding {
+ ENCODING_AUTO,
+ ENCODING_QP,
+ ENCODING_B64
+ };
+
+
+ wordEncoder(
+ const string& buffer,
+ const charset& charset,
+ const Encoding encoding = ENCODING_AUTO
+ );
+
+
+ /** Return the next chunk in the word.
+ *
+ * @param maxLength maximal length of the chunk
+ * @return next chunk, of maximal length 'maxLength' if possible
+ */
+ const string getNextChunk(const size_t maxLength);
+
+ /** Return the encoding used.
+ *
+ * @return encoding
+ */
+ Encoding getEncoding() const;
+
+ /** Test whether RFC-2047 encoding is needed.
+ *
+ * @param ctx generation context
+ * @param buffer buffer to analyze
+ * @param charset charset of the buffer
+ * @param lang language code, in the format specified by RFC-1766
+ * @return true if encoding is needed, false otherwise.
+ */
+ static bool isEncodingNeeded(
+ const generationContext& ctx,
+ const string& buffer,
+ const charset& charset,
+ const string& lang
+ );
+
+ /** Guess the best RFC-2047 encoding to use for the specified buffer.
+ *
+ * @param buffer buffer to analyze
+ * @param charset charset of the buffer
+ * @return RFC-2047 encoding
+ */
+ static Encoding guessBestEncoding(const string& buffer, const charset& charset);
+
+private:
+
+ string m_buffer;
+ size_t m_pos;
+ size_t m_length;
+
+ bool m_simple;
+
+ charset m_charset;
+ Encoding m_encoding;
+
+ shared_ptr <utility::encoder::encoder> m_encoder;
+};
+
+
+} // vmime
+
+
+#endif // VMIME_WORDENCODER_HPP_INCLUDED