import os, struct, sys, ast, argparse

def read_uint32_be(offset):
    return struct.unpack('>I', fileData[offset:offset+4])[0]

def read_uint16_be(offset):
    return struct.unpack('>H', fileData[offset:offset+2])[0]


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument('files', help='file list')
    parser.add_argument('out', help='output file')
    args = parser.parse_args()

    with open(args.out, 'wb') as w, open(args.files, 'rt') as f:
        file_name = f.readline().strip()
        total_size = 0

        while file_name:
            try:
                with open(file_name, 'rb') as current_file:
                    file_data = current_file.read()
                    w.write(file_data)
                    total_size += len(file_data)
            except:
                print('Could not open file ' + file_name)
                sys.exit(1)
            file_name = f.readline().strip()

        while total_size < 0x2000000:
            w.write((total_size % 256).to_bytes(1,"big"))
            total_size += 1