Optional
Returns 0n for directories or data.length + sum(blockSizes) for everything else
0n
data.length + sum(blockSizes)
encode to protobuf Uint8Array
Static
Decode from protobuf https://github.com/ipfs/specs/blob/master/UNIXFS.md
Returns
0n
for directories ordata.length + sum(blockSizes)
for everything else