CURA-5128 WIP compressed g-code reader

plugins/GCodeGzReader/GCodeGzReader.py

@@ -0,0 +1,33 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+import gzip
+import tempfile
+
+from io import StringIO, BufferedIOBase #To write the g-code to a temporary buffer, and for typing.
+from typing import List
+
+from UM.Logger import Logger
+from UM.Mesh.MeshReader import MeshReader #The class we're extending/implementing.
+from UM.PluginRegistry import PluginRegistry
+from UM.Scene.SceneNode import SceneNode #For typing.
+
+##  A file writer that writes gzipped g-code.
+#
+#   If you're zipping g-code, you might as well use gzip!
+class GCodeGzReader(MeshReader):
+
+    def __init__(self):
+        super(GCodeGzReader, self).__init__()
+        self._supported_extensions = [".gcode.gz", ".gz"]
+
+    def read(self, file_name):
+        with open(file_name, "rb") as file:
+            file_data = file.read()
+        uncompressed_gcode = gzip.decompress(file_data)
+        with tempfile.NamedTemporaryFile() as temp_file:
+            temp_file.write(uncompressed_gcode)
+            PluginRegistry.getInstance().getPluginObject("GCodeReader").preRead(temp_file.name)
+            result = PluginRegistry.getInstance().getPluginObject("GCodeReader").read(temp_file.name)
+
+        return result