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* base64.cpp - Base64 converting functions
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* Copyright (C) 2003 Justin Karneges
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but 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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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//! \class Base64 base64.h
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//! \brief Base64 conversion functions.
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//! Converts Base64 data between arrays and strings.
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//! #include "base64.h"
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//! // encode a block of data into base64
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//! QByteArray block(1024);
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//! QByteArray enc = Base64::encode(block);
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//! Encodes array \a s and returns the result.
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QByteArray Base64::encode(const QByteArray &s)
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char tbl[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
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QByteArray p((len+2)/3*4);
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for( i = 0; i < len; i += 3 ) {
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a = ((unsigned char)s[i] & 3) << 4;
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a += (unsigned char)s[i + 1] >> 4;
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b = ((unsigned char)s[i + 1] & 0xF) << 2;
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b += (unsigned char)s[i + 2] >> 6;
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c = (unsigned char)s[i + 2] & 0x3F;
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p[at++] = tbl[(unsigned char)s[i] >> 2];
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//! Decodes array \a s and returns the result.
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QByteArray Base64::decode(const QByteArray &s)
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// -1 specifies invalid
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// everything else specifies data
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,
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52,53,54,55,56,57,58,59,60,61,-1,-1,-1,64,-1,-1,
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-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,
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15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,
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-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
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41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
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// this should be a multiple of 4
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p.resize(len / 4 * 3);
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for( i = 0; i < len; i += 4 ) {
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b = tbl[(int)s[i + 1]];
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c = tbl[(int)s[i + 2]];
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d = tbl[(int)s[i + 3]];
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if((a == 64 || b == 64) || (a < 0 || b < 0 || c < 0 || d < 0)) {
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p[at++] = ((a & 0x3F) << 2) | ((b >> 4) & 0x03);
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p[at++] = ((b & 0x0F) << 4) | ((c >> 2) & 0x0F);
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p[at++] = ((c & 0x03) << 6) | ((d >> 0) & 0x3F);
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//! Encodes array \a a and returns the result as a string.
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QString Base64::arrayToString(const QByteArray &a)
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QByteArray b = encode(a);
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c.resize(b.size()+1);
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memcpy(c.data(), b.data(), b.size());
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return QString::fromLatin1(c);
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//! Decodes string \a s and returns the result as an array.
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QByteArray Base64::stringToArray(const QString &s)
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const char *c = s.latin1();
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memcpy(b.data(), c, len);
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QByteArray a = decode(b);
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//! Encodes string \a s and returns the result as a string.
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QString Base64::encodeString(const QString &s)
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QCString c = s.utf8();
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int len = c.length();
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memcpy(b.data(), c.data(), len);
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return arrayToString(b);