[Vm-dev] Re: SecureSession frame types

[Robert Withers]

More, sorry. I left out the msgSize in the FEC spec. Let me reorder the 
tagging, fit the 3 bytes of normal msgSpec into 4bytes and thusly...


---Default non-FEC msgSpec + header + payload layout:

- 8bytes (X) messageSpecification...
-
- (32bits...)
- 4bits tagging
- 6bits multicastSymbol
- 6bits messageVersion
- 2bits sanguinity
- 6bits headerType "Implies Y header size. NOTE: except for FEC encodings"
- 8bits unused
- (32bits...)
- 4bytes messageSize (X+Y+Z) (Z bytes = (messageSize - headerSize(Y) - 
8bytes msgSpec (X = 8))
-
- Ybytes message header
-
- Zbytes message payload



Special FEC coded 64bit <msgSpec + header> + payload layout, for 64bit 
alignment:

- 8bytes (X) message specification...
-
- (32bits...)
- 4bits tagging
- 6bits multicastSymbol
- 6bits messageVersion
- 2bits sanguinity
- 6bits FEC message type "NOTE: this means different layout"
- 2bits rsMode
- 6bits partial blockCount
- (32bits...)
- 4bits blockCount           "NOTE: for 1MB encoded/982KB data - 
blockCount * blockCodeBytes = Z"
- 20bits messageSize (X+Y+Z) (Z bytes = (messageSize - headerSize(Y) - 
8bytes msgSpec (X = 8))  "NOTE: this can specify 1MB data"
- 8bits primitivePolynomial spec (good for our current rsModes)
-
- Y = 0
-
- Zbytes-sized payload

Ok, that's what it is I think, this proposal.

robert



On 12/20/2015 10:33 AM, Robert Withers wrote:
> ---Default non-FEC msgSpec + header + payload layout:
>
> - 6bits multicastSymbol
> - 2bits sanguinity
> - 6bits messageVersion
> - 6bits headerType "NOTE: except for FEC encodings"
> - 4bytes messageSize
> - Xbytes header
> -
> - (messageSized - headerSize - 7specBytes) Bytes-sized payload
>
>
> Special FEC coded 64bit <msgSpec + header> + payload layout, for 64bit 
> alignment:
>
> - (32bits...)
> - 6bits multicastSymbol
> - 2bits sanguinity
> - 6bits messageVersion
> - 6bits FEC message type "NOTE: this means different layout"
> - 2bits rsMode
> - (32bits...)
> - 10bits blockCount           "NOTE: for 1MB encoded/982KB data"
> - 20bits messageSize        "NOTE: this can specify 1MB data plus
> - 8bits primitivePolynomial spec (good for our current rsModes)
> - 4bits tagging
> -
> - (messageSized - headerSize - 4specBytes) OR (blockCount * rsMode's 
> blockCodeBytes) Bytes-sized payload

-- 
. .. .. ^,^ robert