script to read bits of fx3 firmware

1 files changed, 33 insertions, 0 deletions

diff --git a/fx3parse.py b/fx3parse.py
new file mode 100644
index 0000000..8ff08e4
--- /dev/null
+++ b/fx3parse.py
@@ -0,0 +1,33 @@
+import binascii
+import struct
+
+data = open("firmware/qhy/QHY367.img").read()
+
+if data[0:3] == [0x43, 0x59, 0x1c, 0xb0]:
+    print("looks like an fx3 image to me!")
+
+def read_section(data, offset):
+    length = struct.unpack_from("i", data, offset=offset)[0]
+    addr = struct.unpack_from("i", data, offset=offset + 4)[0]
+    return (data[offset + 8:offset + 8 + length * 4], addr)
+
+offset = 4
+
+sections = []
+
+while True:
+    (section, addr) = read_section(data, offset)
+    sections.append((section, addr, offset))
+    print("read section at addr {}, length {}, file offset {}".format(hex(addr), hex(len(section)), hex(offset)))
+    offset = offset + 8 + len(section)
+    if len(section) == 0:
+        break
+
+def offsetof(sections, addr):
+    for (section, start, offset) in sections:
+        print("considering section {} +{}".format(hex(start), hex(offset)))
+        if addr >= start and addr < start + len(section):
+            sec_addr = addr - start
+            print("file offset of {}: {}".format(hex(addr), hex(sec_addr + offset + 8)))
+
+offsetof(sections, 0x40010a30)