switching GhidrathonInterpreter to use Jep SharedInterpreter (#61)

data/python/jepbuiltins.py

@@ -10,4 +10,4 @@
 
 
 def jep_set_builtin(attr, o):
-    setattr(__builtins__, attr, o)
+    __builtins__[attr] = o

data/python/jepinject.py

@@ -26,5 +26,5 @@
         continue
 
     o = getattr(__ghidra_script__, attr)
-    if callable(o) and attr not in dir(__builtins__):
-        setattr(__builtins__, attr, o)
+    if callable(o) and attr not in __builtins__:
+        __builtins__[attr] = o

data/python/jepstream.py

@@ -0,0 +1,44 @@
+# Copyright (C) 2022 Mandiant, Inc. All Rights Reserved.
+# Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at: [package root]/LICENSE.txt
+# Unless required by applicable law or agreed to in writing, software distributed under the License
+#  is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and limitations under the License.
+
+"""Redirect sys.stdout and sys.stderr to Ghidra console window
+
+Python stdout and stderr print to Python; we want to see this output print to the Ghidra console window. To do this
+we must override sys.stdout and sys.stderr with Java PrintWriters that are connected to the Ghidra console window.
+"""
+import sys
+import io
+
+
+def get_fake_io_wrapper():
+    """build a TextIOWrapper referencing an empty byte array
+
+    we set the encoding to the system default in hopes this doesn't cause issues when sending text from Python to Java
+    """
+    return io.TextIOWrapper(io.BytesIO(b""), encoding=sys.getdefaultencoding())
+
+
+# sys.stdout and sys.stderr may be None (see https://docs.python.org/3/library/sys.html#sys.__stdout__); therefore
+# we must set these to an object that has enough functionality to emulate basic write functionality. we create a
+# TextIOWrapper referencing an empty byte array and override the write method with the write method of our Java
+# PrintWriters connected to the Ghidra console window. hopefully this is good enough but we may run into issues in the
+# future if Python code tries to reference unexpected methods/members e.g. "encoding"
+
+
+if not sys.stdout:
+    sys.stdout = get_fake_io_wrapper()
+
+if not sys.stderr:
+    sys.stderr = get_fake_io_wrapper()
+
+
+# assumes GhidraPluginToolConsoleOut/ErrWriter are passed from Java to Python before execution
+
+
+sys.stdout.write = GhidraPluginToolConsoleOutWriter.write
+sys.stderr.write = GhidraPluginToolConsoleErrWriter.write