Method Associate

libcppcryptfs/file/cryptfile.cpp:87–159

}

BOOL
CryptFileForward::Associate(CryptContext *con, HANDLE hfile, LPCWSTR inputPath, bool bForWrite)
{
	m_openfile = con->m_openfiles.GetOpenFile(inputPath);

	if (!m_openfile) {
		assert(false);
		return FALSE;
	}

	m_bExclusiveLock = bForWrite;

	// the destructor does the unlocking
	Lock();

	static_assert(sizeof(m_header) == FILE_HEADER_LEN, "sizeof(m_header) != FILE_HEADER_LEN");

	m_handle = hfile;

	m_con = con;

	LARGE_INTEGER l;

	if (!GetFileSizeEx(hfile, &l)) {
		DbgPrint(L"ASSOCIATE: failed to get size of file\n");	
		return FALSE;
	}

	m_real_file_size = l.QuadPart;

	if (l.QuadPart == 0) {
		m_header.version = CRYPT_VERSION;
		m_is_empty = true;
		return TRUE;
	} else if (l.QuadPart < FILE_HEADER_LEN) {
		DbgPrint(L"ASSOCIATE: missing file header\n");
		return FALSE;
	}

	l.QuadPart = 0;

	OVERLAPPED ov;
	SetOverlapped(&ov, l.QuadPart);

	DWORD nread;

	if (!ReadFile(hfile, &m_header, sizeof(m_header), &nread, &ov)) {
		DWORD error = GetLastError();
		DbgPrint(L"ASSOCIATE: failed to read header, error = %d\n", error);
		return FALSE;
	}

	if (nread != FILE_HEADER_LEN) {
		DbgPrint(L"ASSOCIATE: wrong number of bytes read when reading file header\n");
		return FALSE;
	}

	m_header.version = MakeBigEndianNative(m_header.version);