build: add read_chunk.py helper

Author: qectorlab

scripts/read_chunk.py

@@ -0,0 +1,14 @@
+import sys
+import base64
+
+if len(sys.argv) < 4:
+    sys.exit(1)
+
+filepath = sys.argv[1]
+offset = int(sys.argv[2])
+length = int(sys.argv[3])
+
+with open(filepath, "rb") as f:
+    f.seek(offset)
+    data = f.read(length)
+    print(base64.b64encode(data).decode('utf-8'))