hg253v2 image builder

hg253v2-image-builder.py

import sys
import binascii
# wget https://raw.githubusercontent.com/SySS-Research/syss-crc/master/syss_crc.py
from syss_crc import CRC

def do_crc(data):
    crc = CRC()
    crc.set_config_by_name('CRC-32/JAMCRC')
    return crc.compute(data)

def long_2_hex(value):
    value = '{:x}'.format(value)
    return binascii.unhexlify(value)

header_size = 0x80 # 128
header = b'X' * header_size

image_size = 0x100
image = b'Y' * image_size


label_size = 0x10
label = b'Z' * label_size

filename = sys.argv[1]
with open(filename, 'wb') as f:
    f.write(header)
    f.write(image)
    crc32 = do_crc(header+image)
    print("ulCRC ", hex(crc32), crc32)
    print("# must be fd995ea4 CRC-32/JAMCRC")
    f.write(long_2_hex(crc32))
    f.write(label)