proposal: chunked encoding

[figroc]

The TLV structure facilitates efficient implementation of the decoding process. On the other hand, it requires the encoder to know the size of the value in advance. This constraint can be detrimental to the encoder when encoding large data blocks and streaming data. The chunked encoding scheme is introduced to balance between the encoder and the decoder. Even the transmission protocol is able to transmit data in chunks, the chunked encoding feature can still save the splicing information which is required for concatenation to be encoded.

Spec: draft-02

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TLV 结构有利于解码器的高效实现，但要求编码器预先得知值的大小。这个约束在大数据块编码和流式编解码时会对编码器不利，因此引入分块编码方式在编解码器之间进行平衡。即使在传输协议存在分块传输能力时，分块编码特性仍然能够节省用于分片拼接所需的拼接编码信息。

编解码器规范见 draft-02