用C设置结构内的数组的大小，并在同一结构内设置另一个值 [英] Setting the size of an array inside a struct with a value of another value within the same struct, in C

问题描述

    struct {
        uint16 msg_length;
        uint8 msg_type;
        ProtocolVersion version;
        uint16 cipher_spec_length;
        uint16 session_id_length;
        uint16 challenge_length;
        V2CipherSpec cipher_specs[V2ClientHello.cipher_spec_length];
        opaque session_id[V2ClientHello.session_id_length];
        opaque challenge[V2ClientHello.challenge_length;
    } V2ClientHello;

是否可以执行与上述类似的操作( http://tools.ietf.org/html/rfc5246 )?如果是这样，我该如何在C中进行编码?

Is it possible to do something similar to the above (http://tools.ietf.org/html/rfc5246)? If so how do I go about coding this inside C?

更具体地讲，此行在struct中:

To be more specific this line in the struct:

V2CipherSpec cipher_specs [V2ClientHello.cipher_spec_length];

V2CipherSpec cipher_specs[V2ClientHello.cipher_spec_length];

用途:

Uses:

V2ClientHello.cipher_spec_length

V2ClientHello.cipher_spec_length

在同一结构中定义，以设置数组的长度.

Which is defined in the same struct, to set the length of the array.

推荐答案

C不支持动态大小的数组.为了实现您的目标，可以使用类型为 V2CipherSpec 的指针作为结构变量，并在以后使用 V2ClientHello.cipher_spec_length 值分配内存.

C does not support dynamic-sized arrays. To achieve your goal, you can use a pointer of type V2CipherSpec as structure variable and allocate memory at a later stage using the V2ClientHello.cipher_spec_length value.

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