preliminary implementation of UE DataFormat in Python

editor-python/src/editor/core/DataFormat.py

@@ -15,6 +15,17 @@
 # You should have received a copy of the GNU General Public License
 # along with editor-python.  If not, see <https://www.gnu.org/licenses/>.
 
+from io import FileIO
+
 class DataFormat:
 
-	pass
+	def load(self, stream : FileIO):
+		self.load_internal(stream)
+
+	def load_internal (self, stream : FileIO):
+		pass
+	def save_internal (self, stream : FileIO):
+		pass
+
+	def save (self, stream : FileIO):
+		self.save_internal(stream)

editor-python/src/editor/core/InvalidDataFormatException.py

@@ -0,0 +1,2 @@
+class InvalidDataFormatException (Exception):
+	pass

editor-python/src/editor/core/__init__.py

@@ -0,0 +1,3 @@
+from .DataFormat import DataFormat
+from .ObjectModel import ObjectModel
+from .InvalidDataFormatException import InvalidDataFormatException

editor-python/src/editor/core/io/Reader.py

@@ -34,10 +34,28 @@ class Reader (ReaderWriterBase):
 		return self._stream
 
 	def read_fixedstring(self, length : int, encoding : Encoding = None) -> str:
+		"""
+		Reads a fixed-length string from the underlying stream.
+		"""
+
 		data = self._stream.read(length)
 		enc = 'utf-8' if encoding is None else encoding.get_value()
 		return bytes.decode(data, enc)
 	
+	def read_terminatedstring(self, encoding : Encoding = None, terminator : str = '\0') -> str:
+		"""
+		Reads a terminated string (e.g. zero/null terminated) from the underlying stream.
+		"""
+		v = ''
+		enc = 'utf-8' if encoding is None else encoding.get_value()
+		while True:
+			c = self._stream.read(1)
+			if bytes.decode(c, enc) == terminator:
+				break
+			v += bytes.decode(c, enc)
+
+		return v
+	
 	def read_single(self) -> float:
 
 		data = self._stream.read(4)