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98 lines
3.3 KiB
98 lines
3.3 KiB
/*
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* Copyright (C) 2015-2022 Département de l'Instruction Publique (DIP-SEM)
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*
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* Copyright (C) 2013 Open Education Foundation
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*
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* Copyright (C) 2010-2013 Groupement d'Intérêt Public pour
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* l'Education Numérique en Afrique (GIP ENA)
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*
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* This file is part of OpenBoard.
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*
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* OpenBoard is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License,
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* with a specific linking exception for the OpenSSL project's
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* "OpenSSL" library (or with modified versions of it that use the
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* same license as the "OpenSSL" library).
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*
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* OpenBoard 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with OpenBoard. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "UBBase32.h"
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#include "core/memcheck.h"
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QString UBBase32::sBase32Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
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int UBBase32::sBase32Lookup[] =
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{ 0xFF,0xFF,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F, // '0', '1', '2', '3', '4', '5', '6', '7'
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, // '8', '9', ':', ';', '<', '=', '>', '?'
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0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06, // '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G'
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0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E, // 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O'
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0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16, // 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W'
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0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF, // 'X', 'Y', 'Z', '[', '\', ']', '^', '_'
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0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06, // '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g'
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0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E, // 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o'
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0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16, // 'p', 'q', 'r', 's', 't', 'u', 'v', 'w'
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0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF // 'x', 'y', 'z', '{', '|', '}', '~', 'DEL'
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};
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QByteArray UBBase32::decode(const QString& base32String)
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{
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int i, index, offset;
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QByteArray bytes(base32String.length() * 5/8, '\0');
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for (i = 0, index = 0, offset = 0; i < base32String.length(); i++)
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{
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QChar ch = base32String.at(i);
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char lookup = ch.toLatin1() - '0';
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/* Skip chars outside the lookup table */
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if (lookup < 0 || lookup >= 80)
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continue;
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int digit = sBase32Lookup[(int)lookup];
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/* If this digit is not in the table, ignore it */
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if (digit == 0xFF)
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continue;
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if (index <= 3)
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{
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index = (index + 5) % 8;
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if (index == 0)
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{
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bytes[offset] = bytes[offset] | digit;
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offset++;
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if(offset >= bytes.length())
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break;
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}
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else
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bytes[offset] = bytes[offset] | (digit << (8 - index));
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}
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else
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{
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index = (index + 5) % 8;
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bytes[offset] = bytes[offset] | ((unsigned int)digit >> index);
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offset++;
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if(offset >= bytes.length())
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break;
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bytes[offset] = bytes[offset] | (digit << (8 - index));
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}
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}
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return bytes;
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}
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