You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
113 lines
3.6 KiB
113 lines
3.6 KiB
/*
|
|
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 TQt library by Trolltech AS, Norway (or with modified versions
|
|
of TQt that use the same license as TQt), 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
|
|
TQt. 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__
|