initial code for dumping imessages in a reasonable format

dump-imessages/iphone-dataprotection/python_scripts/util/tlv.py

@@ -0,0 +1,19 @@
+import struct
+
+def tlvToDict(blob):
+    d = {}
+    for tag,data in loopTLVBlocks(blob):
+        d[tag] = data
+    return d
+
+def tlvToList(blob):
+    return list(loopTLVBlocks(blob))
+    
+def loopTLVBlocks(blob):
+    i = 0
+    while i + 8 <= len(blob):
+        tag = blob[i:i+4]
+        length = struct.unpack(">L",blob[i+4:i+8])[0]
+        data = blob[i+8:i+8+length]
+        yield (tag,data)
+        i += 8 + length