Class DirIvCache

libcppcryptfs/filename/dirivcache.h:59–103

class DirIvCache {

private:

	ULONGLONG m_ttl;

	unordered_map<wstring, DirIvCacheNode*> m_map;

	list<DirIvCacheNode*> m_lru_list;

	list<DirIvCacheNode*> m_spare_node_list;

	CRITICAL_SECTION m_crit;

	long long m_lookups;
	long long m_hits;
	
	void normalize_key(wstring &key);

	void lock();
	void unlock();

	bool check_node_clean(DirIvCacheNode *node, const wstring& path);
	void update_lru(DirIvCacheNode *node);
public:
	// disallow copying
	DirIvCache(DirIvCache const&) = delete;
	void operator=(DirIvCache const&) = delete;

	DirIvCache();

	virtual ~DirIvCache();

	void SetTTL(int nSecs) { m_ttl = (ULONGLONG)nSecs * 1000; };

	bool lookup(LPCWSTR path, unsigned char *dir_iv);

	bool store(LPCWSTR path, const unsigned char *dir_iv, const FILETIME& last_write_time);

	void remove(LPCWSTR path);

	long long hits() { long long rval; lock(); rval = m_hits; unlock(); return rval; }
	long long lookups() { long long rval; lock(); rval = m_lookups; unlock(); return rval; }
	
};