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113 lines
3.6 KiB
113 lines
3.6 KiB
/* -*- c++ -*-
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kmime_codec_base64.h
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This file is part of KMime, the KDE internet mail/usenet news message library.
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Copyright (c) 2001-2002 Marc Mutz <mutz@kde.org>
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KMime is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License, version 2, as
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published by the Free Software Foundation.
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KMime is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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In addition, as a special exception, the copyright holders give
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permission to link the code of this library with any edition of
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the TQt library by Trolltech AS, Norway (or with modified versions
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of TQt that use the same license as TQt), and distribute linked
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combinations including the two. You must obey the GNU General
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Public License in all respects for all of the code used other than
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TQt. If you modify this file, you may extend this exception to
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your version of the file, but you are not obligated to do so. If
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you do not wish to do so, delete this exception statement from
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your version.
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*/
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#ifndef __KMIME_CODEC_BASE64__
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#define __KMIME_CODEC_BASE64__
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#include "kmime_codecs.h"
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namespace KMime {
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class Base64Codec : public Codec {
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protected:
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friend class Codec;
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Base64Codec() : Codec() {}
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public:
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virtual ~Base64Codec() {}
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const char * name() const {
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return "base64";
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}
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int maxEncodedSizeFor( int insize, bool withCRLF=false ) const {
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// first, the total number of 4-char packets will be:
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int totalNumPackets = ( insize + 2 ) / 3;
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// now, after every 76/4'th packet there needs to be a linebreak:
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int numLineBreaks = totalNumPackets / (76/4);
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// and at the very end, too:
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++numLineBreaks;
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// putting it all together, we have:
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return 4 * totalNumPackets + ( withCRLF ? 2 : 1 ) * numLineBreaks;
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}
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int maxDecodedSizeFor( int insize, bool withCRLF=false ) const {
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// assuming all characters are part of the base64 stream (which
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// does almost never hold due to required linebreaking; but
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// additional non-base64 chars don't affect the output size), each
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// 4-tupel of them becomes a 3-tupel in the decoded octet
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// stream. So:
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int result = ( ( insize + 3 ) / 4 ) * 3;
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// but all of them may be \n, so
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if ( withCRLF )
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result *= 2; // :-o
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return result;
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}
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Encoder * makeEncoder( bool withCRLF=false ) const;
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Decoder * makeDecoder( bool withCRLF=false ) const;
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};
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class Rfc2047BEncodingCodec : public Base64Codec {
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protected:
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friend class Codec;
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Rfc2047BEncodingCodec()
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: Base64Codec() {}
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public:
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virtual ~Rfc2047BEncodingCodec() {}
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const char * name() const { return "b"; }
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int maxEncodedSizeFor( int insize, bool withCRLF=false ) const {
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(void)withCRLF; // keep compiler happy
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// Each (begun) 3-octet triple becomes a 4 char quartet, so:
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return ( ( insize + 2 ) / 3 ) * 4;
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}
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int maxDecodedSizeFor( int insize, bool withCRLF=false ) const {
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(void)withCRLF; // keep compiler happy
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// Each 4-char quartet becomes a 3-octet triple, the last one
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// possibly even less. So:
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return ( ( insize + 3 ) / 4 ) * 3;
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}
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Encoder * makeEncoder( bool withCRLF=false ) const;
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};
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} // namespace KMime
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#endif // __KMIME_CODEC_BASE64__
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