bool zofits::WriteCatalog ( )

inlinevirtual

Write the data catalog

Returns

the state of the file

Reimplemented from ofits.

Definition at line 247 of file zofits.h.

        {
            const uint32_t one_catalog_row_size = fTable.num_cols*2*sizeof(uint64_t);
            const uint32_t total_catalog_size   = fNumTiles*one_catalog_row_size;

            // swap the catalog bytes before writing
            std::vector<char> swapped_catalog(total_catalog_size);

            uint32_t shift = 0;
            for (auto it=fCatalog.cbegin(); it!=fCatalog.cend(); it++)
            {
                revcpy<sizeof(uint64_t)>(swapped_catalog.data() + shift, (char*)(it->data()), fTable.num_cols*2);
                shift += one_catalog_row_size;
            }

            if (fCatalogSize < fNumTiles)
                memset(swapped_catalog.data()+shift, 0, total_catalog_size-shift);

            // first time writing ? remember where we are
            if (fCatalogOffset == 0)
                fCatalogOffset = tellp();

            // remember where we came from
            const off_t where_are_we = tellp();

            // write to disk
            seekp(fCatalogOffset);
            write(swapped_catalog.data(), total_catalog_size);

            if (where_are_we != fCatalogOffset)
                seekp(where_are_we);

            // udpate checksum
            fCatalogSum.reset();
            fCatalogSum.add(swapped_catalog.data(), total_catalog_size);

            return good();
        }