File indexing completed on 2023-09-24 07:59:11

 
 /*
     SPDX-FileCopyrightText: 2021 Volker Krause <vkrause@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "kcodecs.h"
 #include "kcodecs_debug.h"
 
 #include <QDebug>
 
 static constexpr const char base45Table[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:";
 
 static uint8_t base45MapFromChar(char c)
 {
     const auto it = std::find(std::begin(base45Table), std::end(base45Table), c);
     if (it == std::end(base45Table)) {
         qCWarning(KCODECS_LOG) << "invalid base45 character:" << c;
         return 0;
     }
     return std::distance(std::begin(base45Table), it);
 }
 
 QByteArray KCodecs::base45Decode(const QByteArray &in)
 {
     QByteArray out;
     out.reserve(((in.size() / 3) + 1) * 2);
 
     for (int i = 0; i + 1 < in.size(); i += 3) {
         uint32_t n = base45MapFromChar(in[i]) + base45MapFromChar(in[i + 1]) * 45;
         if (i + 2 < in.size()) {
             n += 45 * 45 * base45MapFromChar(in[i + 2]);
             out.push_back(n >> 8);
         } else {
             if (n >> 8) {
                 out.push_back(n >> 8);
             }
         }
         out.push_back(n % 256);
     }
 
     return out;
 }