Gets the portion of the HTTP request body that has currently been read by using the specified buffer data and byte offset.

使用指定的缓冲区数据和字节偏移量获取HTTP请求正文当前已被读取的部分。

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ST16C554 works in FIFO mode, receives and transmits data by (interrupt) mode with a 16 byte hardware transmit buffer, that will also greatly cut down the load on the CPU.

ST16C 554工作在FIFO模式，采用中断方式收发数据，并有16字节的硬件接收发送缓冲区，降低了CPU的开销。

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Reads request data from the client (when not preloaded) by using the specified buffer to read from, byte offset, and maximum bytes.

使用指定的要从中读取数据的缓冲区、字节偏移量和最大字节数从客户端读取请求数据(当未预先加载时)。

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