#!/usr/bin/env python
#-*- coding: utf-8 -*-
# -----------------------------------------------------------------------------------------------------------
# Copyright (c) 2025 Huawei Technologies Co., Ltd.
# This program is free software, you can redistribute it and/or modify it under the terms and conditions of
# CANN Open Software License Agreement Version 2.0 (the "License").
# Please refer to the License for details. You may not use this file except in compliance with the License.
# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
# See LICENSE in the root of the software repository for the full text of the License.
# -----------------------------------------------------------------------------------------------------------

#----------------------------------------------------------------------------
# Purpose:
# Copyright Huawei Technologies Co., Ltd. 2010-2025. All rights reserved.
#----------------------------------------------------------------------------
import argparse
import textwrap
import shutil
import os
import struct

def get_args():
    parser = argparse.ArgumentParser(formatter_class=argparse.RawDescriptionHelpFormatter,
                                     description=textwrap.dedent(''' A tool to recover raw img'''))
    parser.add_argument('-img', required=True, dest='img',
                        help='INPUT: img with header, Parse N/E from it')
    parser.add_argument('-raw', required=False, dest='raw',
                        help='INPUT: recovered raw img')
    parser.add_argument('--rcvr', help="recover the raw img without header",
                        action="store_true")

    return parser.parse_args()

def __write_raw_img(raw, img, code_len):
    raw.seek(0)
    img.seek(0x2100)
    rsv_len = code_len - 0x100
    while rsv_len > 0:
        if rsv_len > 4096:
            raw.write(img.read(4096))
        else:
            raw.write(img.read(rsv_len))
        rsv_len -= 4096

def main():
    args = get_args()
    if args.rcvr:
        with open(args.img, 'rb') as img:
            img.seek(0x478)
            code_len = struct.unpack('<I', img.read(4))[0]
            tmp_file = args.raw + '.tmp'
            with open(tmp_file, 'wb+') as raw:
                __write_raw_img(raw, img, code_len)
        shutil.copyfile(tmp_file, args.raw)
        if os.path.exists(tmp_file):
            os.remove(tmp_file)

if __name__ == '__main__':
    main()