u8 cdb[6] = { 0x12, [2] = page_code, [3] = (bufflen >> 8) & 0xff, [4] = (bufflen >> 0) & 0xff,解释这段代码

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u8 cdb[6] = { 0x12, [2] = page_code, [3] = (bufflen >> 8) & 0xff, [4] = (bufflen >> 0) & 0xff,

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用python写一个函数读取二进制文件，二进制文件第一行是版本信息 等号左边是描述，右边是值 后面的头信息以{开始，最后一个}结束 注意头信息里面也有{} 头信息里面的参数都是等号左边是描述，右边是值，值的最后以；结束 头信息的参数可多可少 下面是文件头信息示例 vbf_version = 2.6; header { // Created by VbfSign build: 2017/12/12 on 2020/10/19 9:54 sw_part_number = "8891903679"; sw_version = "A"; sw_part_type = SBL; data_format_identifier = 0x10; ecu_address = 0x1A31; file_checksum = 0x0D81F89D; call = 0x1FFF8004; verification_block_start = 0x20000800; verification_block_length = 0x00000054; verification_block_root_hash = 0x3C440B332BE20F05B9C108F347658FBEBEAA4B3E0D655CAEE76AE210E93E828A; sw_signature_dev = 0x8A97CF400B82AB1B0D82C26976CB26F7AE6B34A87E56675D39E52B9C811F1AB9C040B52FA925BB60E981F388A748F0E09B20D2CBEF7A9A49119EC68C1EFE83BD0EA34B0FDE59F16B8533FEE72219D698C898F4D9EB40B9FCE42C73C028519D1767C11AEEBF0FE746B2F8AB601DA7E3686E4B46AC05851FCDD7A55CBF5F72DA826B0152640514F87CE905362CBFA7F19FE04CAA84A2882E20592E2000D576F629A1B05A207FB59DDC6E8DD10154F148AACA7CBBD5E978BF9E67EDC1ADD186E098A81FEF3C657D2AEFC083F25D307DE00715AB8B2C78CDB23CD13B3DAD9110333ADAB672F1EC6B6D5CFCAF04FC71490A54ECE1745E46D4AB3A9D1E0BA0CACE0B92; sw_signature = 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}

可以使用Python的with语句和正则表达式来读取该二进制文件，并将头信息存储为字典：

import re

def read_binary_file(filename):
    header_regex = re.compile(r'(\w+)\s*=\s*(.*?)(?=;|\})', re.DOTALL)
    header = {}

    with open(filename, 'rb') as f:
        line = f.readline().decode().strip()
        version_info = line.split('=')[1].strip()

        for match in header_regex.finditer(f.read().decode()):
            header[match.group(1)] = match.group(2).strip()

    return version_info, header

函数中，首先定义了一个正则表达式，用于匹配头信息中的参数。然后使用Python的with语句打开文件，并读取文件的第一行版本信息。接着使用正则表达式匹配头信息，并将匹配结果存储为字典。最后返回版本信息和头信息字典。

注意，由于头信息可能包含大括号，因此使用了re.DOTALL标志来匹配任意字符，包括换行符。