CURA-5128 WIP compressed g-code reader

plugins/GCodeGzReader/GCodeGzReader.py

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+# 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

plugins/GCodeGzReader/__init__.py

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+# Copyright (c) 2016 Aleph Objects, Inc.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from . import GCodeGzReader
+
+from UM.i18n import i18nCatalog
+i18n_catalog = i18nCatalog("cura")
+
+def getMetaData():
+    return {
+        "mesh_reader": [
+            {
+                "extension": "gcode.gz",
+                "description": i18n_catalog.i18nc("@item:inlistbox", "Compressed G-code File")
+            }
+        ]
+    }
+
+def register(app):
+    app.addNonSliceableExtension(".gcode.gz")
+    return { "mesh_reader": GCodeGzReader.GCodeGzReader() }

plugins/GCodeGzReader/plugin.json

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+{
+    "name": "Compressed G-code Reader",
+    "author": "Ultimaker B.V.",
+    "version": "1.0.0",
+    "description": "Reads g-code from a compressed archive.",
+    "api": 4,
+    "i18n-catalog": "cura"
+}