增加Lua函数

libnpk/source/libNPK_FileStream.cpp

@@ -84,4 +84,46 @@ uint32_t CFileStream::crc32(void)
 	return m_crc32;
 }
 
+bool CFileStream::writeToDiskFile(const wchar_t* diskPathFile)
+{
+	HANDLE hFile = ::CreateFileW(diskPathFile,
+		FILE_READ_DATA | FILE_WRITE_DATA | FILE_APPEND_DATA,
+		FILE_SHARE_READ | FILE_SHARE_WRITE,
+		0,
+		CREATE_ALWAYS,
+		FILE_ATTRIBUTE_ARCHIVE,
+		0);
+
+	if (hFile == INVALID_HANDLE_VALUE)
+	{
+		setLastError(NPK_ERR_FILE_CREATE, "Failed to open output file for writing, LastError=%d.", ::GetLastError());
+		return false; // Failed to open output file
+	}
+
+	//store current read offset
+	uint32_t currentOffset = m_currentOffset;
+	m_currentOffset = 0;
+	
+	//read loop
+	char buffer[4096] = { 0 };
+	uint32_t bytesRead = 0;
+
+	while ((bytesRead = this->read(buffer, sizeof(buffer))) > 0)
+	{
+		DWORD dwWriteBytes = 0;
+		if (!WriteFile(hFile, buffer, bytesRead, &dwWriteBytes, 0) ||
+			dwWriteBytes != bytesRead)
+		{
+			setLastError(NPK_ERR_FILE_WRITE, "Failed to write to output file, LastError=%d", ::GetLastError());
+
+			CloseHandle(hFile);
+			m_currentOffset = currentOffset;
+			return false; // Failed to write to output file
+		}
+	}
+	CloseHandle(hFile);
+	m_currentOffset = currentOffset;
+	return true;
+}
+
 }