Re: What does ? ? ? mean in the octet diagrams in the HPACK rfc7541

On 29/07/17 12:19, Hadil Sabbagh wrote:
> I am confused by the question marks in the diagrams for the integer compressionn in HPACK. Does this mean we ignore the values of the bits, or are they set by another process — reserved for something else?

As the first paragraph of that section states " An integer 
representation can start anywhere within an octet."

Integers are almost always preceded by a typecode of some sort which 
indicates what the integer values means. eg indexes numbers for the 
various tables, or a header field-value. The type codes have different 
lengths which are defined later in the document.

The '?' are there to emphasize that some number of bits (not always 3) 
are to be ignored by the integer decoder in the first byte it is given.


Received on Saturday, 29 July 2017 01:16:07 UTC