qgscopcupdate.h

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/***************************************************************************
    qgscopcupdate.h
    ---------------------
    begin                : January 2025
    copyright            : (C) 2025 by Martin Dobias
    email                : wonder dot sk at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSCOPCUPDATE_H
#define QGSCOPCUPDATE_H
 
#include "lazperf/header.hpp"
#include "lazperf/vlr.hpp"
#include "qgis_core.h"
#include "qgspointcloudindex.h"
 
#define SIP_NO_FILE

class CORE_EXPORT QgsCopcUpdate
{
  public:

    struct UpdatedChunk
    {
      int32_t pointCount;
      QByteArray chunkData;
    };

    bool read( const QString &inputFilename );

    bool write( const QString &outputFilename, const QHash<QgsPointCloudNodeId, UpdatedChunk> &updatedChunks );

    QString errorMessage() const { return mErrorMessage; }

    static bool writeUpdatedFile( const QString &inputFilename,
                                  const QString &outputFilename,
                                  const QHash<QgsPointCloudNodeId, UpdatedChunk> &updatedChunks,
                                  QString *errorMessage = nullptr );
 
  private:
    bool readHeader();
    void readChunkTable();
    void readHierarchy();
 
  private:
    QString mInputFilename;
    std::ifstream mFile;
    lazperf::header14 mHeader;
    lazperf::copc_info_vlr mCopcVlr;
    std::vector<lazperf::chunk> mChunks;
    uint32_t mChunkCount = 0;
    uint64_t mHierarchyOffset = 0;
    std::vector<char> mHierarchyBlob;
    std::vector<lazperf::evlr_header> mEvlrHeaders;
    std::vector<std::vector<char>> mEvlrData;
    QHash<uint64_t, QgsPointCloudNodeId> mOffsetToVoxel;
 
    QString mErrorMessage;
};
 
#endif // QGSCOPCUPDATE_H