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[问与答] 自定义协议的 magic number 超过 8 字节，如何在大小端系统正确解释

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假如协议头: 0xDEADBEEFDEADBEEFEF 9 个字节，而用于网络和主机字节序转换的函数 htonl/ntohl 最多能转换一个 long 的长度即 8 个字节

那么如何在大小端系统中传输这个自定义协议数据时，如何保证都能正确解释这个协议头（能够正确判断协议头对，自定义协议基于 TCP ）

期望：

  • TCP 数据：data=0xDEADBEEFDEADBEEFEF
  • 小端系统：some_func(data) == 0xDEADBEEFDEADBEEFEF
  • 大端系统：some_func(data) == 0xDEADBEEFDEADBEEFEF

结论：协议头正确

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