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base64.hh
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/**
* @file base64.hh
*
* @author Guillaume Anciaux <guillaume.anciaux@epfl.ch>
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Thu Mar 11 2010
* @date last modification: Wed Nov 13 2013
*
* @brief header for base64 handling
*
* @section LICENSE
*
* Copyright (©) 2010-2012, 2014 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* IOHelper 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 3 of the License, or (at your option) any
* later version.
*
* IOHelper 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 IOHelper. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef __IOHLPER_BASE64_H__
#define __IOHLPER_BASE64_H__
/* -------------------------------------------------------------------------- */
#include <vector>
#include "file_manager.hh"
#ifdef USING_ZLIB
#include <zlib.h>
#endif
/* -------------------------------------------------------------------------- */
__BEGIN_IOHELPER__
#if defined(__INTEL_COMPILER)
#pragma warning ( push )
/// remark #981: operands are evaluated in unspecified order
#pragma warning ( disable : 981 )
#endif
//defined(__INTEL_COMPILER)
/** Class that allow to push binary data
in base64 format to any file.
This class is mainly used by the paraview helper
to create binary XML VTK files.
The conversion is a 4/3 size conversion. */
class
Base64Writer
{
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public
:
Base64Writer
(
File
&
f
);
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
//! for any packet in base64 a little header is used that is an int = nbBytes written
void
WriteHeader
();
//! this is used to allocate the memory for the final count of bytes
void
CreateHeader
();
//! when all stream is ready buffer is sent to file
inline
void
DumpToFile
();
//! empty temporary buffer
void
ClearBuffer
();
template
<
typename
T
>
inline
void
push
(
T
c
);
//! notify that we don't want to add any data. Closing the current buffer
void
finish
();
//! decode 3 bytes from 4 Base64 bytes (4/3 ratio)
int
Decode
(
char
c0
,
char
c1
,
char
c2
,
char
c3
,
char
*
r0
,
char
*
r1
,
char
*
r2
);
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
private
:
//! push to file a Byte
inline
void
PushByteInBase64
(
unsigned
char
c
);
//! when 4 bytes are ready they are dumped to buffer by this function
inline
void
dumpToBuffer
();
//! initialisation process
inline
void
InitBase64Stuff
();
//! primitive function to push bytes to file
//void ochar(int c);
//! decoding table
char
dtable
[
256
];
//! encoding table
char
etable
[
256
];
//! stage in conversion process(1,2 or 3)
int
n
;
//! used to code/decode
unsigned
char
igroup
[
3
],
ogroup
[
4
];
//!unused
int
linelength
;
//!unused
// int maxlinelength;
//! LM file descriptor
File
&
file
;
//! buffer to cache data
std
::
vector
<
unsigned
char
>
buffer
;
//! number of bytes written to buffer
long
nbBytes
;
//! for rewind need o floating index
int
start
;
};
/* -------------------------------------------------------------------------- */
template
<
typename
T
>
inline
void
Base64Writer
::
push
(
T
t
)
{
unsigned
char
*
c
=
(
unsigned
char
*
)
&
t
;
for
(
unsigned
int
i
=
0
;
i
<
sizeof
(
T
)
;
++
i
){
this
->
PushByteInBase64
(
c
[
i
]);
}
}
template
<>
inline
void
Base64Writer
::
push
<
char
*>
(
char
*
str
)
{
unsigned
char
*
c
=
(
unsigned
char
*
)
str
;
for
(
unsigned
int
i
=
0
;
i
<
512
;
++
i
){
if
(
str
[
i
]
==
'\0'
)
break
;
PushByteInBase64
(
c
[
i
]);
}
}
inline
void
Base64Writer
::
InitBase64Stuff
(){
memset
(
dtable
,
0xFF
,
256
);
memset
(
etable
,
0xFF
,
256
);
for
(
int
i
=
0
;
i
<
9
;
i
++
){
etable
[
i
]
=
(
char
)(
'A'
+
i
);
dtable
[
0
+
etable
[
i
]]
=
(
char
)
i
;
etable
[
i
+
9
]
=
(
char
)(
'J'
+
i
);
dtable
[(
0
+
etable
[
i
+
9
])]
=
(
char
)(
i
+
9
);
etable
[
26
+
i
]
=
(
char
)(
'a'
+
i
);
dtable
[(
0
+
etable
[
26
+
i
])]
=
(
char
)(
i
+
26
);
etable
[(
26
+
i
+
9
)]
=
(
char
)(
'j'
+
i
);
dtable
[(
0
+
etable
[
26
+
i
+
9
])]
=
(
char
)(
i
+
26
+
9
);
}
for
(
int
i
=
0
;
i
<
8
;
i
++
){
etable
[
i
+
18
]
=
(
char
)(
'S'
+
i
);
dtable
[(
0
+
etable
[
i
+
18
])]
=
(
char
)(
i
+
18
);
etable
[
26
+
i
+
18
]
=
(
char
)(
's'
+
i
);
dtable
[(
0
+
etable
[
26
+
i
+
18
])]
=
(
char
)(
26
+
i
+
18
);
}
for
(
char
i
=
0
;
i
<
10
;
i
++
){
etable
[
52
+
i
]
=
(
char
)(
'0'
+
i
);
dtable
[(
0
+
etable
[
i
+
52
])]
=
(
char
)(
i
+
52
);
}
etable
[
62
]
=
'+'
;
dtable
[
0
+
etable
[
62
]]
=
62
;
etable
[
63
]
=
'/'
;
dtable
[
0
+
etable
[
63
]]
=
63
;
}
/* -------------------------------------------------------------------------- */
// inline void Base64Writer::PushIntegerInBase64(int d){
// // DUMP("pushing " << d << " ( n = " << n << " )",DBG_ALL);
// unsigned char * c = (unsigned char*)&d;
// for (unsigned int i = 0 ; i < sizeof(int) ; ++i){
// PushByteInBase64(c[i]);
// }
// }
// /* -------------------------------------------------------------------------- */
// inline void Base64Writer::PushStrInBase64(char * str){
// unsigned char * c = (unsigned char*)str;
// for (unsigned int i = 0 ; i < 512 ; ++i){
// if (str[i] == '\0') break;
// PushByteInBase64(c[i]);
// }
// }
// /* -------------------------------------------------------------------------- */
// inline void Base64Writer::PushDoubleInBase64(double d){
// // DUMP("pushing double " << d << " as " << sizeof(double) << " bytes",DBG_ALL);
// unsigned char * c = (unsigned char*)&d;
// for (unsigned int i = 0 ; i < sizeof(double) ; ++i){
// PushByteInBase64(c[i]);
// }
// }
// /* -------------------------------------------------------------------------- */
inline
void
Base64Writer
::
PushByteInBase64
(
unsigned
char
c
){
//initialise les blocs
// DUMP("pushing byte " << (int) c << " at position " << n,DBG_ALL);
if
(
n
==
0
){
igroup
[
0
]
=
0
;
igroup
[
1
]
=
0
;
igroup
[
2
]
=
0
;
}
igroup
[
n
]
=
c
;
++
n
;
if
(
n
==
3
){
dumpToBuffer
();
}
nbBytes
+=
1
;
}
/* -------------------------------------------------------------------------- */
inline
void
Base64Writer
::
finish
(){
if
(
n
==
0
)
return
;
dumpToBuffer
();
linelength
=
0
;
}
/* -------------------------------------------------------------------------- */
inline
void
Base64Writer
::
dumpToBuffer
(){
if
(
n
<
3
){
igroup
[
2
]
=
0
;
if
(
n
<
2
){
igroup
[
1
]
=
0
;
}
}
//DUMP("premiere partie en base 64 : " << (igroup[0]>>2),DBG_ALL);
int
index
=
igroup
[
0
]
>>
2
;
ogroup
[
0
]
=
etable
[
index
];
//DUMP("deuxieme partie en base 64 : " << (((igroup[0]&3)<<4)|(igroup[1]>>4)),DBG_ALL);
index
=
((
igroup
[
0
]
&
3
)
<<
4
)
|
(
igroup
[
1
]
>>
4
);
ogroup
[
1
]
=
etable
[
index
];
//DUMP("troisieme partie en base 64 : " << (((igroup[1]&0xF)<<2)|(igroup[2]>>6)),DBG_ALL);
index
=
((
igroup
[
1
]
&
0xF
)
<<
2
)
|
(
igroup
[
2
]
>>
6
);
ogroup
[
2
]
=
etable
[
index
];
//DUMP("last partie en base 64 : " << (igroup[2]&0x3F),DBG_ALL);
index
=
igroup
[
2
]
&
0x3F
;
ogroup
[
3
]
=
etable
[
index
];
if
(
n
<
3
){
ogroup
[
3
]
=
'='
;
if
(
n
<
2
){
ogroup
[
2
]
=
'='
;
}
}
for
(
int
i
=
0
;
i
<
4
;
i
++
){
//DUMP("dumped to buffer " << ogroup[i],DBG_ALL);
if
(
start
==
-
1
)
buffer
.
push_back
(
ogroup
[
i
]);
else
{
buffer
[
start
]
=
ogroup
[
i
];
++
start
;
}
}
//remise a zero du compteur
n
=
0
;
}
/* inline void Base64Writer::ochar(int c) */
/* { */
/* if(file.dumpchar(c)==-1){ */
/* FATAL("error while writing to file (in compressed mode) ! no more space ?"); */
/* } */
/* linelength++; */
/* } */
/* -------------------------------------------------------------------------- */
inline
int
Base64Writer
::
Decode
(
char
c0
,
char
c1
,
char
c2
,
char
c3
,
char
*
r0
,
char
*
r1
,
char
*
r2
){
unsigned
char
d0
,
d1
,
d2
,
d3
;
d0
=
dtable
[
0
+
c0
];
d1
=
dtable
[
0
+
c1
];
d2
=
dtable
[
0
+
c2
];
d3
=
dtable
[
0
+
c3
];
//DUMP("d0 " << (int)d0 << " d1 " << (int)d1 << " d2 " << (int)d2 << " d3 " << (int)d3,DBG_ALL);
// Decode the 3 bytes
*
r0
=
(
char
)(((
d0
<<
2
)
&
0xFC
)
|
((
d1
>>
4
)
&
0x03
));
*
r1
=
(
char
)(((
d1
<<
4
)
&
0xF0
)
|
((
d2
>>
2
)
&
0x0F
));
*
r2
=
(
char
)(((
d2
<<
6
)
&
0xC0
)
|
((
d3
>>
0
)
&
0x3F
));
//DUMP("r0 " << (int)*r0 << " r1 " << (int)*r1 << " r2 " << (int)*r2,DBG_ALL);
// Return the number of bytes actually decoded
if
(
c2
==
'='
)
{
return
1
;
}
if
(
c3
==
'='
)
{
return
2
;
}
return
3
;
}
/* -------------------------------------------------------------------------- */
inline
void
Base64Writer
::
WriteHeader
(){
// if (bflag == BASE64){
// char byteC[8];
char
byte
[
6
];
finish
();
/* long save_offset; */
/* save_offset = file.tell(); */
/* file.seek(header_offset,SEEK_SET); */
/* //reread the 4 bytes precedently written */
/* file.read(byteC,sizeof(char),4); */
/* DUMP("la chaine saisie " << byteC[0] << " " << byteC[1] << " " << byteC[2] << " " << byteC[3]); */
/* b64.Decode(byteC[0],byteC[0],byteC[0],byteC[0], */
/* byte,byte+1,byte+2); */
//DUMP("la chaine saisie " << buffer[0] << " " << buffer[1] << " " << buffer[2] << " " << buffer[3],DBG_ALL);
Decode
(
buffer
[
0
],
buffer
[
0
],
buffer
[
0
],
buffer
[
0
],
byte
,
byte
+
1
,
byte
+
2
);
/* file.read(byteC+4,sizeof(char),4); */
/* DUMP("la chaine saisie " << byteC[4] << " " << byteC[5] << " " << byteC[6] << " " << byteC[7]); */
/* int nb = b64.Decode(byteC[4],byteC[5],byteC[6],byteC[7], */
/* byte+3,byte+4,byte+5); */
//DUMP("la chaine saisie " << buffer[4] << " " << buffer[5] << " " << buffer[6] << " " << buffer[7],DBG_ALL);
int
nb
=
Decode
(
buffer
[
4
],
buffer
[
5
],
buffer
[
6
],
buffer
[
7
],
byte
+
3
,
byte
+
4
,
byte
+
5
);
/* //je me replace au debut du header */
/* file.seek(header_offset,SEEK_SET); */
/* //je viens de relire 6 octets */
/* //les quatres premiers seulement sont a changer */
//DUMP("placing number of writen bytes : " << nbBytes << " " << buffer.size(),DBG_ALL);
int
temp
=
nbBytes
;
start
=
0
;
push
(
temp
);
if
(
nb
>
1
)
push
(
byte
[
4
]);
if
(
nb
>
2
)
push
(
byte
[
5
]);
start
=
-
1
;
nbBytes
=
temp
;
finish
();
DumpToFile
();
}
/* -------------------------------------------------------------------------- */
inline
void
Base64Writer
::
DumpToFile
(){
file
.
write
((
char
*
)
&
buffer
[
0
],
buffer
.
size
());
}
/* -------------------------------------------------------------------------- */
inline
void
Base64Writer
::
ClearBuffer
(){
buffer
.
clear
();
nbBytes
=
0
;
}
/* -------------------------------------------------------------------------- */
inline
void
Base64Writer
::
CreateHeader
(){
ClearBuffer
();
push
<
int
>
(
0
);
}
/* -------------------------------------------------------------------------- */
inline
Base64Writer
::
Base64Writer
(
File
&
f
)
:
file
(
f
){
linelength
=
0
;
InitBase64Stuff
();
n
=
0
;
start
=
-
1
;
igroup
[
0
]
=
0
;
igroup
[
1
]
=
0
;
igroup
[
2
]
=
0
;
ogroup
[
0
]
=
0
;
ogroup
[
1
]
=
0
;
ogroup
[
2
]
=
0
;
ogroup
[
3
]
=
0
;
}
/* -------------------------------------------------------------------------- */
#if defined(__INTEL_COMPILER)
/// remark #981: operands are evaluated in unspecified order
#pragma warning ( pop )
#endif
//defined(__INTEL_COMPILER)
__END_IOHELPER__
#endif
/* __IOHLPER_BASE64_H__ */
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