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84 lines
2.6 KiB
C++
84 lines
2.6 KiB
C++
/*****************************************************************************
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* Copyright (c) 2020, Hobu, Inc. (info@hobu.co) *
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* *
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* All rights reserved. *
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* *
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* This program 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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****************************************************************************/
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#pragma once
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#include "../untwine/Common.hpp"
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#include "../untwine/Point.hpp"
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#include <mapfile.hpp> // untwine/os
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#include "FileInfo.hpp"
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namespace untwine
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{
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namespace bu
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{
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class PointAccessor
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{
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public:
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PointAccessor(const BaseInfo& b) : m_b(b)
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{}
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~PointAccessor()
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{
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for (FileInfo *fi : m_fileInfos)
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os::unmapFile(fi->context());
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}
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void read(FileInfo& fi)
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{
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std::string filename = m_b.opts.tempDir + "/" + fi.filename();
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auto ctx = os::mapFile(filename, true, 0, fi.numPoints() * m_b.pointSize);
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if (ctx.m_addr == nullptr)
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throw FatalError(filename + ": " + ctx.m_error);
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fi.setContext(ctx);
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fi.setStart(size());
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m_fileInfos.push_back(&fi);
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}
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Point operator[](size_t offset)
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{
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for (FileInfo *fi : m_fileInfos)
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if (offset >= (size_t)fi->start() &&
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offset < (size_t)fi->start() + fi->numPoints())
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return Point(fi->address() + ((offset - fi->start()) * m_b.pointSize));
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return Point();
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}
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size_t size()
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{
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// start() returns the number of points in the file infos before the last one.
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// adding numPoints() provides the total number of points.
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if (m_fileInfos.empty())
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return 0;
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else
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return m_fileInfos.back()->start() + m_fileInfos.back()->numPoints();
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}
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void dump()
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{
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std::cerr << "Accessor infos:\n";
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for (FileInfo *fi : m_fileInfos)
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std::cerr << fi->filename() << "/" << fi->start() << "/" << fi->numPoints() << "!\n";
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std::cerr << "\n";
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}
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private:
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const BaseInfo& m_b;
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std::vector<FileInfo *> m_fileInfos;
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};
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} // namespace bu
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} // namespace untwine
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