1 files changed, 43 insertions, 0 deletions
diff --git a/src/virtualenv/util/zipapp.py b/src/virtualenv/util/zipapp.py
new file mode 100644
index 0000000..fa3ed4b
--- /dev/null
+++ b/src/virtualenv/util/zipapp.py
@@ -0,0 +1,43 @@
+from __future__ import absolute_import, unicode_literals
+
+import logging
+import os
+import zipfile
+
+import six
+
+from virtualenv.info import IS_WIN, ROOT, get_default_data_dir
+from virtualenv.version import __version__
+
+
+def read(full_path):
+    sub_file = _get_path_within_zip(full_path)
+    with zipfile.ZipFile(ROOT, "r") as zip_file:
+        with zip_file.open(sub_file) as file_handler:
+            return file_handler.read().decode("utf-8")
+
+
+def extract(full_path, dest):
+    logging.debug("extract %s to %s", full_path, dest)
+    sub_file = _get_path_within_zip(full_path)
+    with zipfile.ZipFile(ROOT, "r") as zip_file:
+        info = zip_file.getinfo(sub_file)
+        info.filename = dest.name
+        zip_file.extract(info, six.ensure_text(str(dest.parent)))
+
+
+def _get_path_within_zip(full_path):
+    sub_file = str(full_path)[len(ROOT) + 1 :]
+    if IS_WIN:
+        # paths are always UNIX separators, even on Windows, though __file__ still follows platform default
+        sub_file = sub_file.replace(os.sep, "/")
+    return sub_file
+
+
+def extract_to_app_data(full_path):
+    base = get_default_data_dir() / "zipapp" / "extract" / __version__
+    base.mkdir(parents=True, exist_ok=True)
+    dest = base / full_path.name
+    if not dest.exists():
+        extract(full_path, dest)
+    return dest