Moved compressing of GCode to one class higher

CL-541

cura/PrinterOutput/NetworkedPrinterOutputDevice.py

@@ -45,6 +45,10 @@ class NetworkedPrinterOutputDevice(PrinterOutputDevice):
 
         self._cached_multiparts = {}
 
+        self._sending_gcode = False
+        self._compressing_gcode = False
+        self._gcode = []
+
     def requestWrite(self, nodes, file_name=None, filter_by_machine=False, file_handler=None, **kwargs):
         raise NotImplementedError("requestWrite needs to be implemented")
 
@@ -57,6 +61,34 @@ class NetworkedPrinterOutputDevice(PrinterOutputDevice):
     def authenticationState(self):
         return self._authentication_state
 
+    def _compressGCode(self):
+        self._compressing_gcode = True
+
+        ## Mash the data into single string
+        max_chars_per_line = int(1024 * 1024 / 4)  # 1/4 MB per line.
+        byte_array_file_data = b""
+        batched_line = ""
+
+        for line in self._gcode:
+            if not self._compressing_gcode:
+                self._progress_message.hide()
+                # Stop trying to zip / send as abort was called.
+                return
+            batched_line += line
+            # if the gcode was read from a gcode file, self._gcode will be a list of all lines in that file.
+            # Compressing line by line in this case is extremely slow, so we need to batch them.
+            if len(batched_line) < max_chars_per_line:
+                continue
+            byte_array_file_data += self.__compressDataAndNotifyQt(batched_line)
+            batched_line = ""
+
+        # Don't miss the last batch (If any)
+        if batched_line:
+            byte_array_file_data += self.__compressDataAndNotifyQt(batched_line)
+
+        self._compressing_gcode = False
+        return byte_array_file_data
+
     def _update(self):
         if self._last_response_time:
             time_since_last_response = time() - self._last_response_time