class DirIterator {

	FS& fs;
	ClusterNr nextCluster;
	int curEntryInCluster;
	uint8_t buf[512];

public:

	DirIterator(FS& fs, ClusterNr clusterNr) : fs(fs), nextCluster(clusterNr), curEntryInCluster(255) {

	}

	bool hasNext() {

		while(true) {

			++curEntryInCluster;

			// reached end of cluster? load the next one
			if (curEntryInCluster > fs.tmp.dirEntriesPerSector) {
				fs.dev.read(fs.clusterToAbsPos(nextCluster), 512, buf);
				nextCluster = fs.getNextCluster(nextCluster);
				curEntryInCluster = 0;
			}

			DirEntry* desc = reinterpret_cast<DirEntry*>(buf + (sizeof(DirEntry) * curEntryInCluster));

			if (desc->isLongFileName())		{continue;}
			if (desc->isUnused())			{continue;}
			if (desc->isEndOfDirectory())	{return false;}

			return true;

		}

	}

	DirEntry next() {
		DirEntry* de = reinterpret_cast<DirEntry*>(buf + (sizeof(DirEntry) * curEntryInCluster));
		return *de;
	}

};