84 lines
3.4 KiB
C++
84 lines
3.4 KiB
C++
/*
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* Copyright (C) 2020, 2021 Gavin MacGregor
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*
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* This file is part of QTeletextMaker.
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*
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* QTeletextMaker 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, either version 3 of the License, or
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* (at your option) any later version.
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*
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* QTeletextMaker 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 QTeletextMaker. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <QByteArray>
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#include "pagex26base.h"
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QByteArray PageX26Base::packetFromEnhancementList(int packetNumber) const
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{
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QByteArray result(40, 0x00);
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int enhanceListPointer;
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X26Triplet lastTriplet;
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for (int i=0; i<13; i++) {
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enhanceListPointer = packetNumber*13+i;
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if (enhanceListPointer < m_enhancements.size()) {
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result[i*3+1] = m_enhancements.at(enhanceListPointer).address();
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result[i*3+2] = m_enhancements.at(enhanceListPointer).mode() | ((m_enhancements.at(enhanceListPointer).data() & 1) << 5);
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result[i*3+3] = m_enhancements.at(enhanceListPointer).data() >> 1;
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// If this is the last triplet, get a copy to repeat to the end of the packet
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if (enhanceListPointer == m_enhancements.size()-1) {
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lastTriplet = m_enhancements.at(enhanceListPointer);
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// If the last triplet was NOT a Termination Marker, make up one
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if (lastTriplet.mode() != 0x1f || lastTriplet.address() != 0x3f) {
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lastTriplet.setAddress(0x3f);
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lastTriplet.setMode(0x1f);
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lastTriplet.setData(0x07);
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}
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}
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} else {
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// We've gone past the end of the triplet list, so repeat the Termination Marker to the end
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result[i*3+1] = lastTriplet.address();
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result[i*3+2] = lastTriplet.mode() | ((lastTriplet.data() & 1) << 5);
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result[i*3+3] = lastTriplet.data() >> 1;
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}
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}
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return result;
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}
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void PageX26Base::setEnhancementListFromPacket(int packetNumber, QByteArray packetContents)
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{
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// Preallocate entries in the m_enhancements list to hold our incoming triplets.
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// We write "dummy" reserved 11110 Row Triplets in the allocated entries which then get overwritten by the packet contents.
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// This is in case of missing packets so we can keep Local Object pointers valid.
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while (m_enhancements.size() < (packetNumber+1)*13)
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m_enhancements.append(m_paddingX26Triplet);
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int enhanceListPointer;
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X26Triplet newX26Triplet;
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for (int i=0; i<13; i++) {
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enhanceListPointer = packetNumber*13+i;
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newX26Triplet.setAddress(packetContents.at(i*3+1) & 0x3f);
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newX26Triplet.setMode(packetContents.at(i*3+2) & 0x1f);
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newX26Triplet.setData(((packetContents.at(i*3+3) & 0x3f) << 1) | ((packetContents.at(i*3+2) & 0x20) >> 5));
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m_enhancements.replace(enhanceListPointer, newX26Triplet);
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}
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if (newX26Triplet.mode() == 0x1f && newX26Triplet.address() == 0x3f && newX26Triplet.data() & 0x01)
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// Last triplet was a Termination Marker (without ..follows) so clean up the repeated ones
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while (m_enhancements.size()>1 && m_enhancements.at(m_enhancements.size()-2).mode() == 0x1f && m_enhancements.at(m_enhancements.size()-2).address() == 0x3f && m_enhancements.at(m_enhancements.size()-2).data() == newX26Triplet.data())
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m_enhancements.removeLast();
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}
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