netty - How to set the length adjustment bytes mentioned in the LengthFieldBasedFrameDecoder class -

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from lengthfieldbasedframedecoder's documentation, allow user decode header field header 1 . encoder class allow user define such header field?

* advanced example shows case there  * header between length field , message body.  have specify  * positive <tt>lengthadjustment</tt> decoder counts  * header frame length calculation.  * <pre>  * lengthfieldoffset   = 0  * lengthfieldlength   = 3  * <b>lengthadjustment</b>    = <b>2</b> (= length of header 1)  * initialbytestostrip = 0  *  * before decode (17 bytes)                      after decode (17 bytes)  * +----------+----------+----------------+      +----------+----------+----------------+  * |  length  | header 1 | actual content |----->|  length  | header 1 | actual content |  * | 0x00000c |  0xcafe  | "hello, world" |      | 0x00000c |  0xcafe  | "hello, world" |  * +----------+----------+----------------+      +----------+----------+----------------+

netty doesn't include such encoder should able write own , write bytes bytebuf before write down pipeline.


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