Function read_dir_iv

libcppcryptfs/util/fileutil.cpp:139–191

#ifdef _WIN32
static bool
read_dir_iv(const TCHAR *path, unsigned char *diriv, FILETIME& LastWriteTime)
{

	HANDLE hfile = INVALID_HANDLE_VALUE;
	DWORD nRead = 0;

	bool caught_wstring = false;

	try {
		wstring path_str;

		path_str.append(path);

		if (path_str[path_str.size() - 1] != '\\') {
			path_str.push_back('\\');
		}

		path_str.append(DIR_IV_NAME);

		hfile = ::CreateFile(&path_str[0], GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);

		if (hfile == INVALID_HANDLE_VALUE) {
			auto lasterr =::GetLastError();
			throw(L"\terror opening diriv file " + path_str + L" lasterr = " + to_wstring(lasterr));
		}

		if (!::ReadFile(hfile, diriv, DIR_IV_LEN, &nRead, NULL)) {
			auto lasterr = ::GetLastError();
			throw(L"\terror reading diriv file " + path_str + L" lasterr = " + to_wstring(lasterr));
		}

		if (!::GetFileTime(hfile, NULL, NULL, &LastWriteTime)) {
			auto lasterr = ::GetLastError();
			throw(L"\terror getting filetime of diriv file " + path_str + L" lasterr = " + to_wstring(lasterr));			
		}
	} catch (const wstring& mes) {
		DbgPrint(L"\tget_diriv: %s\n", mes.c_str());
		nRead = 0;
		caught_wstring = true;
	} catch (...) {
		nRead = 0;		
	}

	if (hfile != INVALID_HANDLE_VALUE)
		::CloseHandle(hfile);

	if (!caught_wstring && nRead != DIR_IV_LEN) {
		DbgPrint(L"\tget_diriv read incorrect number of bytes from %s, read %u bytes instead of %u\n", path, nRead, DIR_IV_LEN);
	}

	return nRead == DIR_IV_LEN;
}

#endif // _WIN32