UnpackNXPISP.py

#!/usr/bin/env python3
#   Copyright 2018 ckb-next Development Team <ckb-next@googlegroups.com>
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import NXPCommon
import sys

def printHelp():
    print("Usage: " + sys.argv[0] + " Image.bin")
    sys.exit(-1)

if len(sys.argv) - 1 != 1 or "--help" in sys.argv or "-h" in sys.argv:
    printHelp()

with open(sys.argv[1], "rb") as file:
    # First 0x6000 bytes are BLD
    bld = file.read(NXPCommon.BLD_LEN)
    with open("ExtractedBLD.bin", "wb") as out:
        out.write(bld)

    # Seek to 0x6000, first App binary starts from there
    #file.seek(NXPCommon.BLD_LEN)
    # Max app length appears to be 0xC000
    app1 = file.read(NXPCommon.APP_LEN)
    with open("ExtractedAPP1.bin", "wb") as out:
        out.write(app1)

    # Seek to the second App binary
    #file.seek(0x12000) # NXPCommon.BLD_LEN + NXPCommon.APP_LEN
    # Read the rest of the App2
    app2 = file.read(NXPCommon.APP_LEN)
    with open("ExtractedAPP2.bin", "wb") as out:
        out.write(app2)

    print("Done!")

    if app1 == app2:
        print("Extracted APP images are identical.")
    else:
        print("Extracted APP images differ.")

    # File is padded with 0xFF all the way up to 0x20000