From 5bf22fc7e3c392c8bd44315ca2d06d7dca7d084e Mon Sep 17 00:00:00 2001
From: sotech117 <michael_foiani@brown.edu>
Date: Thu, 31 Jul 2025 17:27:24 -0400
Subject: add code for analysis of data

---
 .../site-packages/itsdangerous/encoding.py         | 54 ++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 venv/lib/python3.8/site-packages/itsdangerous/encoding.py

(limited to 'venv/lib/python3.8/site-packages/itsdangerous/encoding.py')

diff --git a/venv/lib/python3.8/site-packages/itsdangerous/encoding.py b/venv/lib/python3.8/site-packages/itsdangerous/encoding.py
new file mode 100644
index 0000000..f5ca80f
--- /dev/null
+++ b/venv/lib/python3.8/site-packages/itsdangerous/encoding.py
@@ -0,0 +1,54 @@
+from __future__ import annotations
+
+import base64
+import string
+import struct
+import typing as t
+
+from .exc import BadData
+
+
+def want_bytes(
+    s: str | bytes, encoding: str = "utf-8", errors: str = "strict"
+) -> bytes:
+    if isinstance(s, str):
+        s = s.encode(encoding, errors)
+
+    return s
+
+
+def base64_encode(string: str | bytes) -> bytes:
+    """Base64 encode a string of bytes or text. The resulting bytes are
+    safe to use in URLs.
+    """
+    string = want_bytes(string)
+    return base64.urlsafe_b64encode(string).rstrip(b"=")
+
+
+def base64_decode(string: str | bytes) -> bytes:
+    """Base64 decode a URL-safe string of bytes or text. The result is
+    bytes.
+    """
+    string = want_bytes(string, encoding="ascii", errors="ignore")
+    string += b"=" * (-len(string) % 4)
+
+    try:
+        return base64.urlsafe_b64decode(string)
+    except (TypeError, ValueError) as e:
+        raise BadData("Invalid base64-encoded data") from e
+
+
+# The alphabet used by base64.urlsafe_*
+_base64_alphabet = f"{string.ascii_letters}{string.digits}-_=".encode("ascii")
+
+_int64_struct = struct.Struct(">Q")
+_int_to_bytes = _int64_struct.pack
+_bytes_to_int = t.cast("t.Callable[[bytes], tuple[int]]", _int64_struct.unpack)
+
+
+def int_to_bytes(num: int) -> bytes:
+    return _int_to_bytes(num).lstrip(b"\x00")
+
+
+def bytes_to_int(bytestr: bytes) -> int:
+    return _bytes_to_int(bytestr.rjust(8, b"\x00"))[0]
-- 
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