kopia lustrzana https://github.com/OpenRTX/OpenRTX
89 wiersze
2.2 KiB
Python
89 wiersze
2.2 KiB
Python
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#!/usr/bin/env python2
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# -*- coding: utf-8 -*-
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#
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# Copyright 2011 Dominic Spill
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# Copyright 2010 TheSeven
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#
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# This file was forked form Project Ubertooth.
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#
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from struct import pack, unpack
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crc_table = []
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# From freemyipod.org
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for i in range(256):
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t = i
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for j in range(8):
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if t & 1:
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t = (t >> 1) ^ 0xedb88320
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else:
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t >>= 1
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crc_table.append(t)
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def crc32(data):
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crc = 0xffffffff
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for byte in data:
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crc = (crc >> 8) ^ crc_table[(crc ^ ord(byte)) & 0xff]
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return crc
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def check_suffix(firmware):
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"""Check the dfu suffix"""
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print('Checking firmware signature')
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data = firmware[:-4]
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length = ord(firmware[-5])
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suffix = firmware[-length:]
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# Will always have these fields
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dwCRC = unpack('<L', suffix[12:])[0]
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bLength = unpack('<B', suffix[11])[0]
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ucDfuSig = unpack('<3s', suffix[8:11])[0]
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bcdDFU = unpack('<H', suffix[6:8])[0]
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# bcdDFU, ucDfuSig, bLength, dwCRC = unpack('<H3sBL', suffix[6:])
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if bLength != 16:
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raise Exception("Unknown DFU suffix length: %s" % type(bLength))
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# We only know about dfu version 1.0/1.1
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# This needs to be smarter to support other versions if/when they exist
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if bcdDFU != 0x0100:
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raise Exception("Unknown DFU version: %d" % bcdDFU)
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# Suffix bytes are reversed
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if ucDfuSig != 'UFD':
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raise Exception("DFU Signature mismatch: not a DFU file")
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crc = crc32(data)
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if crc != dwCRC:
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raise Exception("CRC mismatch: calculated: 0x%x, found: 0x%x" % (crc, dwCRC))
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# Extract additional fields now that we know the suffix contains them
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idVendor = unpack('<H', suffix[4:6])[0]
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idProduct = unpack('<H', suffix[2:4])[0]
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# Version information that we can't verify
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bcdDevice = unpack('<H', suffix[0:2])[0]
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return length, idVendor, idProduct
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def add_suffix(firmware, vendor, product):
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bcdDevice = 0
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idProduct = product
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idVendor = vendor
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bcdDFU = 0x0100
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ucDfuSig = 'UFD'
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bLength = 16
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suffix = pack('<4H3sB', bcdDevice, idProduct, idVendor, bcdDFU, ucDfuSig, bLength)
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firmware += suffix
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crc = crc32(firmware)
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firmware += pack('<I', crc)
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return firmware
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