initial code for dumping imessages in a reasonable format

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

@@ -0,0 +1,27 @@
+from construct.core import Struct
+from construct.macros import *
+from construct import RepeatUntil, OneOf
+from util import hexdump
+
+SCFGItem = Struct("SCFGItem",
+                  String("tag", 4),
+                  String("data", 16, padchar="\x00")
+                  )
+
+SCFG = Struct("SCFG",
+                OneOf(String("magic", 4), ["gfCS"]),
+                ULInt32("length"),
+                ULInt32("unk1"),
+                ULInt32("unk2"),
+                ULInt32("unk3"),
+                ULInt32("unk4")
+            )
+
+def parse_SCFG(data):
+    res = {}
+    scfg = SCFG.parse(data)
+    assert scfg.length > 0x18
+    for i in Array((scfg.length - 0x18) / 20, SCFGItem).parse(data[0x18:scfg.length]):
+        if i.tag != "\xFF\xFF\xFF\xFF":
+            res[str(i.tag)[::-1]] = str(i.data)
+    return res