Switch Simple BCT parser

switch_bct.py

#!/usr/bin/python3

from struct import *
import sys

def main():
    args = sys.argv[1::]
    if len(args) < 1:
        print(sys.argv[0] + " boot.bct")
        return
    f = open(sys.argv[1], 'rb')

    (num_entries, virtual_block_size, block_size, bct_key, bct_signature_hash, bct_signature) = unpack("IBB522x256s16s256s", f.read(0x0420))
    f.seek(0x0444)
    bct_signature_hash = bct_signature_hash.hex().upper()
    bct_signature_hash = bct_signature_hash if bct_signature_hash == ("0" * 0x10) else "none"
    customer_data = f.read(0xC4).hex().upper()
    customer_data = customer_data if customer_data == ("0" * 0xC4) else "none"

    info = "BCT File\nEntry count: 0x{0:X}\nVirtual block size: 0x{1:X}\nBlock size: 0x{2:X}\nKey: {3}\nSignature Hash: {4}\nSignature: {5}\nCustomer Data: {6}"
    print(info.format(num_entries, virtual_block_size, block_size, bct_key.hex().upper(), bct_signature_hash, bct_signature.hex().upper(), customer_data))

    #Ignore a lot of data that I don't need
    f.seek(0x232C)
    num_bootloaders = int.from_bytes(f.read(0x4), byteorder='little')
    print("Bootloader count: {}".format(num_bootloaders))
    for i in range(num_bootloaders):
        (version, start_block, start_page, length, load_addr, entry_point, attribute, bootloader_hash, bootloader_signature) = unpack("IIIIIII16s256s", f.read(0x12C))
        bootloader_hash = bootloader_hash.hex().upper()
        bootloader_hash = bootloader_hash if bootloader_hash == ("0" * 0x10) else "none"
        print("\nBootloader {0}\nVersion: 0x{1:X}\nBlock Start: 0x{2:X}\nStart Page: 0x{3:X}\nLength: 0x{4:X}\nLoad address: 0x{5:X}\nEntry point: 0x{6:X}\nAttribute: {7:X}\nHash: {8}\nSignature: {9}\n".format(i, version, start_block, start_page, length, load_addr, entry_point, attribute, bootloader_hash, bootloader_signature.hex().upper()))

    f.close()
    return

if __name__ == '__main__':
    main()