Method Directory

lib/vfs/cbmfs.cc:115–172

    {
    public:
        Directory(CbmfsFilesystem* fs)
        {
            /* Read the BAM. */

            uint8_t t = fs->_config.directory_track();
            uint8_t s = 0;
            auto b = fs->getSector(t, 0, s);
            ByteReader br(b);
            br.skip(2);
            dosVersion = br.read_8();
            br.skip(1);

            bam.resize(fs->getLogicalSectorCount());
            usedBlocks = 0;
            unsigned block = 0;
            for (int track = 0; track < globalConfig()->layout().tracks();
                track++)
            {
                uint8_t blocks = br.read_8();
                uint32_t bitmap = br.read_le24();
                for (int sector = 0; sector < blocks; sector++)
                {
                    if (bitmap & (1 << sector))
                    {
                        bam[block + sector] = bitmap & (1 << sector);
                        usedBlocks++;
                    }
                }
                block += blocks;
            }

            /* Read the volume name. */

            br.seek(0x90);
            auto nameBytes = br.read(16).split(0xa0)[0];
            volumeName = fromPetscii(nameBytes);

            /* Read the directory. */

            s = 1;
            while (t != 0xff)
            {
                auto b = fs->getSector(t, 0, s);

                for (int i = 0; i < 8; i++)
                {
                    auto dbuf = b.slice(i * 32, 32);
                    if (dbuf[2] == 0)
                        continue;

                    auto de = std::make_shared<CbmfsDirent>(dbuf);
                    dirents.push_back(de);
                }

                t = b[0] - 1;
                s = b[1];
            }
        }