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diff --git a/libkmime/kmime_codec_base64.h b/libkmime/kmime_codec_base64.h
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+++ b/libkmime/kmime_codec_base64.h
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+/*  -*- c++ -*-
+    kmime_codec_base64.h
+
+    This file is part of KMime, the KDE internet mail/usenet news message library.
+    Copyright (c) 2001-2002 Marc Mutz <mutz@kde.org>
+
+    KMime is free software; you can redistribute it and/or modify it
+    under the terms of the GNU General Public License, version 2, as
+    published by the Free Software Foundation.
+
+    KMime 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 library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of this library with any edition of
+    the Qt library by Trolltech AS, Norway (or with modified versions
+    of Qt that use the same license as Qt), and distribute linked
+    combinations including the two.  You must obey the GNU General
+    Public License in all respects for all of the code used other than
+    Qt.  If you modify this file, you may extend this exception to
+    your version of the file, but you are not obligated to do so.  If
+    you do not wish to do so, delete this exception statement from
+    your version.
+*/
+
+#ifndef __KMIME_CODEC_BASE64__
+#define __KMIME_CODEC_BASE64__
+
+#include "kmime_codecs.h"
+
+namespace KMime {
+
+class Base64Codec : public Codec {
+protected:
+  friend class Codec;
+  Base64Codec() : Codec() {}
+
+public:
+  virtual ~Base64Codec() {}
+
+  const char * name() const {
+    return "base64";
+  }
+
+  int maxEncodedSizeFor( int insize, bool withCRLF=false ) const {
+    // first, the total number of 4-char packets will be:
+    int totalNumPackets = ( insize + 2 ) / 3;
+    // now, after every 76/4'th packet there needs to be a linebreak:
+    int numLineBreaks = totalNumPackets / (76/4);
+    // and at the very end, too:
+    ++numLineBreaks;
+    // putting it all together, we have:
+    return 4 * totalNumPackets + ( withCRLF ? 2 : 1 ) * numLineBreaks;
+  }
+
+  int maxDecodedSizeFor( int insize, bool withCRLF=false ) const {
+    // assuming all characters are part of the base64 stream (which
+    // does almost never hold due to required linebreaking; but
+    // additional non-base64 chars don't affect the output size), each
+    // 4-tupel of them becomes a 3-tupel in the decoded octet
+    // stream. So:
+    int result = ( ( insize + 3 ) / 4 ) * 3;
+    // but all of them may be \n, so
+    if ( withCRLF )
+      result *= 2; // :-o
+
+    return result;
+  }
+
+  Encoder * makeEncoder( bool withCRLF=false ) const;
+  Decoder * makeDecoder( bool withCRLF=false ) const;
+};
+
+
+
+class Rfc2047BEncodingCodec : public Base64Codec {
+protected:
+  friend class Codec;
+  Rfc2047BEncodingCodec()
+    : Base64Codec() {}
+  
+public:
+  virtual ~Rfc2047BEncodingCodec() {}
+
+  const char * name() const { return "b"; }
+
+  int maxEncodedSizeFor( int insize, bool withCRLF=false ) const {
+    (void)withCRLF; // keep compiler happy
+    // Each (begun) 3-octet triple becomes a 4 char quartet, so:
+    return ( ( insize + 2 ) / 3 ) * 4;
+  }
+
+  int maxDecodedSizeFor( int insize, bool withCRLF=false ) const {
+    (void)withCRLF; // keep compiler happy
+    // Each 4-char quartet becomes a 3-octet triple, the last one
+    // possibly even less. So:
+    return ( ( insize + 3 ) / 4 ) * 3;
+  }
+
+  Encoder * makeEncoder( bool withCRLF=false ) const;
+};
+
+
+} // namespace KMime
+
+#endif // __KMIME_CODEC_BASE64__