这是从伯克利BSD的mbuf中提取的实现代码，如果使用者看过TCP/IP详解2的朋友就会在开篇看到这个代码， 我将其改写，虽然还是没有支持cluster的操作，但是基本可以从中知道这个实现的过程了。 关于Balloc是我为嵌入式系统定制的小型内存块管理系统，用4字节管理128个字节的内存。 MBuffer 是基于其上实现的。（如果没有使用Balloc，dtom将不能得到正确的结果）。-This is the mbuf from the Berkeley BSD implementat

There are two other differences from the equivalent TCP/IP code that are worth noting, both concerning the possible exceptions that may be generated: • the IOException in main is replaced with a SocketException • there is no checked

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