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/*
* base64.cpp - Base64 converting functions
* Copyright (C) 2003 Justin Karneges
*
* 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.
*
* 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
*
*/
#include "base64.h"
// CS_NAMESPACE_BEGIN
//! \class Base64 base64.h
//! \brief Base64 conversion functions.
//!
//! Converts Base64 data between arrays and strings.
//!
//! \code
//! #include "base64.h"
//!
//! ...
//!
//! // encode a block of data into base64
//! TQByteArray block(1024);
//! TQByteArray enc = Base64::encode(block);
//!
//! \endcode
//!
//! Encodes array \a s and returns the result.
TQByteArray Base64::encode(const TQByteArray &s)
{
int i;
int len = s.size();
char tbl[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
int a, b, c;
TQByteArray p((len+2)/3*4);
int at = 0;
for( i = 0; i < len; i += 3 ) {
a = ((unsigned char)s[i] & 3) << 4;
if(i + 1 < len) {
a += (unsigned char)s[i + 1] >> 4;
b = ((unsigned char)s[i + 1] & 0xF) << 2;
if(i + 2 < len) {
b += (unsigned char)s[i + 2] >> 6;
c = (unsigned char)s[i + 2] & 0x3F;
}
else
c = 64;
}
else
b = c = 64;
p[at++] = tbl[(unsigned char)s[i] >> 2];
p[at++] = tbl[a];
p[at++] = tbl[b];
p[at++] = tbl[c];
}
return p;
}
//!
//! Decodes array \a s and returns the result.
TQByteArray Base64::decode(const TQByteArray &s)
{
// return value
TQByteArray p;
// -1 specifies invalid
// 64 specifies eof
// everything else specifies data
signed char tbl[] = {
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,
52,53,54,55,56,57,58,59,60,61,-1,-1,-1,64,-1,-1,
-1, 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,-1,-1,-1,-1,-1,
-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
};
// this should be a multiple of 4
int len = s.size();
if(len % 4)
return p;
p.resize(len / 4 * 3);
int i;
int at = 0;
int a, b, c, d;
c = d = 0;
for( i = 0; i < len; i += 4 ) {
a = tbl[(int)s[i]];
b = tbl[(int)s[i + 1]];
c = tbl[(int)s[i + 2]];
d = tbl[(int)s[i + 3]];
if((a == 64 || b == 64) || (a < 0 || b < 0 || c < 0 || d < 0)) {
p.resize(0);
return p;
}
p[at++] = ((a & 0x3F) << 2) | ((b >> 4) & 0x03);
p[at++] = ((b & 0x0F) << 4) | ((c >> 2) & 0x0F);
p[at++] = ((c & 0x03) << 6) | ((d >> 0) & 0x3F);
}
if(c & 64)
p.resize(at - 2);
else if(d & 64)
p.resize(at - 1);
return p;
}
//!
//! Encodes array \a a and returns the result as a string.
TQString Base64::arrayToString(const TQByteArray &a)
{
TQByteArray b = encode(a);
TQCString c;
c.resize(b.size()+1);
memcpy(c.data(), b.data(), b.size());
return TQString::fromLatin1(c);
}
//!
//! Decodes string \a s and returns the result as an array.
TQByteArray Base64::stringToArray(const TQString &s)
{
if(s.isEmpty())
return TQByteArray();
// Unfold data
TQString us(s);
us.remove('\n');
const char *c = us.latin1();
int len = strlen(c);
TQByteArray b(len);
memcpy(b.data(), c, len);
TQByteArray a = decode(b);
return a;
}
//!
//! Encodes string \a s and returns the result as a string.
TQString Base64::encodeString(const TQString &s)
{
TQCString c = s.utf8();
int len = c.length();
TQByteArray b(len);
memcpy(b.data(), c.data(), len);
return arrayToString(b);
}
// CS_NAMESPACE_END
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