As far as I can see the rohc_compress4() reads the complete IP packet from one buffer and writes the compressed header(s) and the payload to another buffer. Is there a way to set the compressor to only read the header(s) and write the compressed headers? The purpose is to avoid copying he unchanged payload from one buffer to another. I have tried by setting the struct rohc_buf len member to the length of the headers but then the compression fails. It seems like the len member has to match the IP headers total lenght field to obtain successful compression.
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