zoom_header.hh

#ifndef DPJ_ZOOM_HEADER_HH_
#define DPJ_ZOOM_HEADER_HH_

#include <cstdint>

#include <ostream>
#include <iomanip>

struct zoom_header {
    static const uint32_t byte_size = 24;

    uint32_t reduction_level;
    uint32_t reserved;
    uint64_t data_offset;
    uint64_t index_offset;

    // void pack(std::ostream& os) const;

    friend void zoom_print(zoom_header const& h, std::ostream& os) {
        using std::setw;
        using std::left;
        os << setw(25) << left << "reduction_level" << h.reduction_level << '\n';
        os << setw(25) << left << "reserved" << h.reserved << '\n';
        os << setw(25) << left << "data_offset" << h.data_offset << '\n';
        os << setw(25) << left << "index_offset" << h.index_offset << '\n';
    }

    friend void unpack(zoom_header& h, std::streambuf* s) {
        s->sgetn((char*)&h.reduction_level, sizeof h.reduction_level);
        s->sgetn((char*)&h.reserved, sizeof h.reserved);
        s->sgetn((char*)&h.data_offset, sizeof h.data_offset);
        s->sgetn((char*)&h.index_offset, sizeof h.index_offset);
    }
};

#endif /* DPJ_ZOOM_HEADER_HH_ */