1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
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)
|
