PlotFS/plotfactory.hpp at main · benengele/PlotFS · GitHub

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#pragma once

#include <cstdint>
#include <string>
#include <vector>
#include <fcntl.h>
#include <unistd.h>
#include "plot.hpp"

class PlotFactory {

public:

    virtual std::shared_ptr<PlotFile> openPlot(const std::string& path) const
    {
        uint8_t k = 0;
        std::string signature;
        std::vector<uint8_t> id(32);
        int fd = ::open(path.c_str(), O_RDONLY);
        if (fd < 0) {
            return nullptr;
        }

        signature.resize(19);
        if (::read(fd, signature.data(), signature.size()) != signature.size()) {
            ::close(fd);
            return nullptr;
        }
        if (::read(fd, id.data(), id.size()) != id.size()) {
            ::close(fd);
            return nullptr;
        }
        if (::read(fd, &k, 1) != 1) {
            ::close(fd);
            return nullptr;
        }
        if (0 != ::lseek64(fd, 0, SEEK_SET)) {
            ::close(fd);
            return nullptr;
        }
        return std::make_shared<PlotFile>(fd, k, id);
    }
};