initial code for dumping imessages in a reasonable format

dump-imessages/iphone-dataprotection/python_scripts/firmware/img2.py

@@ -0,0 +1,12 @@
+from construct.core import Struct
+from construct.macros import *
+
+IMG2 = Struct("IMG2",
+              String("magic",4),
+              ULInt32("block_size"),
+              ULInt32("images_offset"),
+              ULInt32("images_block"),
+              ULInt32("images_length"),
+              Padding(0x1C),
+              ULInt32("crc32"),
+              )