/usr/include/cxxtools/base64codec.h is in libcxxtools-dev 2.0-4ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2005 by Marc Boris Duerner
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* As a special exception, you may use this file as part of a free
* software library without restriction. Specifically, if other files
* instantiate templates or use macros or inline functions from this
* file, or you compile this file and link it with other files to
* produce an executable, this file does not by itself cause the
* resulting executable to be covered by the GNU General Public
* License. This exception does not however invalidate any other
* reasons why the executable file might be covered by the GNU Library
* General Public License.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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
*/
#ifndef cxxtools_Base64Codec_h
#define cxxtools_Base64Codec_h
#include <cxxtools/api.h>
#include <cxxtools/types.h>
#include <cxxtools/textcodec.h>
namespace cxxtools {
class Base64Codec : public TextCodec<char, char>
{
public:
explicit Base64Codec(size_t ref = 0)
: TextCodec<char, char>(ref)
{}
virtual ~Base64Codec()
{}
protected:
result do_in(MBState& s,
const char* fromBegin,
const char* fromEnd,
const char*& fromNext,
char* toBegin,
char* toEnd,
char*& toNext) const;
result do_out(MBState& s,
const char* fromBegin,
const char* fromEnd,
const char*& fromNext,
char* toBegin,
char* toEnd,
char*& toNext) const;
result do_unshift(MBState& state,
char* toBegin,
char* toEnd,
char*& toNext) const;
bool do_always_noconv() const throw()
{
return false;
}
int do_length(MBState& s, const char* fromBegin,
const char* fromEnd, size_t max) const
{
const int from = (fromEnd - fromBegin) / 4;
const int to = max / 3;
return to > from ? from * 4 : to * 4;
}
int do_encoding() const throw()
{
// stateful encoding
return -1;
}
int do_max_length() const throw()
{
//worst case: XX== -> x
return 4;
}
};
inline char toBase64(uint8_t n)
{
static const char b64enc[]
= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
return b64enc[n];
}
inline uint8_t fromBase64(char b64)
{
static const uint8_t b64dec[]
= { 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,62,255,255,255,63,
52,53,54,55,56,57,58,59,60,61,255,255,255,64,255,255,
255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,
15,16,17,18,19,20,21,22,23,24,25,255,255,255,255,255,
255,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
41,42,43,44,45,46,47,48,49,50,51,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255 };
return b64dec[(int)b64];
}
inline Base64Codec::result Base64Codec::do_in(MBState& s,
const char* fromBegin,
const char* fromEnd,
const char*& fromNext,
char* toBegin,
char* toEnd,
char*& toNext) const
{
fromNext = fromBegin;
toNext = toBegin;
while( (fromEnd - fromNext) >= 4 && (toEnd - toNext) >= 3 )
{
cxxtools::uint8_t first = fromBase64( *(fromNext++) );
cxxtools::uint8_t second = fromBase64( *(fromNext++) );
cxxtools::uint8_t third = fromBase64( *(fromNext++) );
cxxtools::uint8_t fourth = fromBase64( *(fromNext++) );
*(toNext++) = (first << 2) + (second >> 4);
if(third != 64)
*(toNext++) = (second << 4) + (third >> 2);
if(fourth != 64)
*(toNext++) = (third << 6) + (fourth);
}
if( fromEnd == fromNext )
return std::codecvt_base::ok;
return std::codecvt_base::partial;
}
inline Base64Codec::result Base64Codec::do_out(cxxtools::MBState& state,
const char* fromBegin,
const char* fromEnd,
const char*& fromNext,
char* toBegin,
char* toEnd,
char*& toNext) const
{
fromNext = fromBegin;
toNext = toBegin;
const char* first = 0;
const char* second = 0;
const char* third = 0;
if(fromEnd - fromNext < 1)
return std::codecvt_base::partial;
if(toEnd - toNext < 4)
return std::codecvt_base::partial;
switch( state.n )
{
case 2:
first = &state.value.mbytes[0];
second = &state.value.mbytes[1];
third = fromNext++;
break;
case 1:
if(fromEnd - fromNext < 2)
{
state.value.mbytes[1] = *fromNext++;
state.n = 2;
return std::codecvt_base::partial;
}
first = &state.value.mbytes[0];
second = fromNext++;
third = fromNext++;
break;
default:
first = fromNext++;
second = fromNext++;
third = fromNext++;
break;
}
while (true)
{
*toNext++ = toBase64( (*first >> 2) & 0x3f );
*(toNext++) = toBase64( ((*first << 4) + ((*second) >> 4)) & 0x3f );
*(toNext++) = toBase64( ((*second << 2) + ((*third) >> 6)) & 0x3f );
*(toNext++) = toBase64( *third & 0x3f );
if(toEnd - toNext < 4)
return std::codecvt_base::partial;
if( fromEnd - fromNext < 3 )
break;
first = fromNext++;
second = fromNext++;
third = fromNext++;
}
switch( fromEnd - fromNext )
{
case 2:
state.value.mbytes[0] = *fromNext++;
state.value.mbytes[1] = *fromNext++;
state.n = 2;
break;
case 1:
state.value.mbytes[0] = *fromNext++;
state.n = 1;
break;
default:
state = MBState();
break;
}
return std::codecvt_base::ok;
}
inline Base64Codec::result Base64Codec::do_unshift(MBState& state,
char* toBegin,
char* toEnd,
char*& toNext) const
{
toNext = toBegin;
if(toEnd - toBegin < 4)
{
return std::codecvt_base::partial;
}
switch(state.n)
{
case 2:
*toNext++ = toBase64( (state.value.mbytes[0] >> 2) & 0x3f );
*(toNext++) = toBase64( ((state.value.mbytes[0] << 4) + ((state.value.mbytes[1]) >> 4)) & 0x3f );
*(toNext++) = toBase64( (state.value.mbytes[1] << 2) & 0x3f );
*(toNext++) = '=';
break;
case 1:
*toNext++ = toBase64( (state.value.mbytes[0] >> 2) & 0x3f );
*(toNext++) = toBase64( (state.value.mbytes[0] << 4) & 0x3f );
*(toNext++) = '=';
*(toNext++) = '=';
break;
case 0:
return std::codecvt_base::noconv;
}
state = MBState();
return std::codecvt_base::ok;
}
} //namespace cxxtools
#endif
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