在 C# 中表示位数组的最佳方式？

发布于 2024-08-29 06:42:52 字数 682 浏览 18 评论 0 原文

我目前正在 C# 中构建 DHCPMessage 类。

RFC 可在此处获取：http://www.faqs.org/rfcs/rfc2131.html

伪

public object DHCPMessage
{
    bool[8] op;
    bool[8] htype;
    bool[8] hlen;
    bool[8] hops;
    bool[32] xid;
    bool[16] secs;
    bool[16] flags;
    bool[32] ciaddr;
    bool[32] yiaddr;
    bool[32] siaddr;
    bool[32] giaddr;
    bool[128] chaddr;
    bool[512] sname;
    bool[1024] file;
    bool[] options;
}

如果我们想象每个字段都是一个固定长度的位数组，那么什么是：

最通用的
最佳实践

将其表示为类的

方法？？？或者..你会怎么写这个？ :)

原文

I am currently building a DHCPMessage class in c#.

RFC is available here : http://www.faqs.org/rfcs/rfc2131.html

Pseudo

public object DHCPMessage
{
    bool[8] op;
    bool[8] htype;
    bool[8] hlen;
    bool[8] hops;
    bool[32] xid;
    bool[16] secs;
    bool[16] flags;
    bool[32] ciaddr;
    bool[32] yiaddr;
    bool[32] siaddr;
    bool[32] giaddr;
    bool[128] chaddr;
    bool[512] sname;
    bool[1024] file;
    bool[] options;
}

If we imagine that each field is a fixed length bit array, what is :

The most versitile
Best practice

way of representing this as a class???

OR.. how would you write this? :)

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忱杏 2024-09-05 06:42:52

对于初学者，您可以尝试 BitArray 类。无需在这里重新发明轮子。

如果您担心它占用太多空间/内存，请不要担心。只需将其初始化为正确的大小即可：（

BitArray op = new BitArray(8);

上面将保存 8 位，应占用 1 个字节）

For starters, you might try the BitArray class. No need to reinvent the wheel here.

If you're worried about it taking up too much space/memory, don't be. Just initialize it to the right size:

BitArray op = new BitArray(8);

(The above will hold 8 bits and should take up 1 byte)

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情深已缘浅 2024-09-05 06:42:52

你走错了路，它不是位向量。该消息以“八位位组”定义，即“字节”。可以与 Marshal.PtrToStructure 一起使用的等效 C# 声明是：

    [StructLayout(LayoutKind.Sequential, Pack=1, CharSet=CharSet.Ansi)]
    struct DHCPMessage {
        public byte op;
        public byte htype;
        public byte hlen;
        public byte hops;
        public uint xid;
        public ushort secs;
        public ushort flags;
        public uint ciaddr;
        public uint yiaddr;
        public uint siaddr;
        public uint giaddr;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst=16)]
        public byte[] chaddr;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=64)]
        public string sname;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=128)]
        public string file;
    }

您需要单独处理可变长度选项字段。

You are on the wrong track with this, it isn't a bit vector. The message is defined in "octets", better known as "bytes". An equivalent C# declaration that you can use with Marshal.PtrToStructure is:

    [StructLayout(LayoutKind.Sequential, Pack=1, CharSet=CharSet.Ansi)]
    struct DHCPMessage {
        public byte op;
        public byte htype;
        public byte hlen;
        public byte hops;
        public uint xid;
        public ushort secs;
        public ushort flags;
        public uint ciaddr;
        public uint yiaddr;
        public uint siaddr;
        public uint giaddr;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst=16)]
        public byte[] chaddr;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=64)]
        public string sname;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=128)]
        public string file;
    }

You'll need to handle the variable length options field separately.

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