5
Write data into it, and it'll output data in buffer blocks the size you
6
specify, padding with zeroes if necessary.
9
var block = new BlockStream(512)
10
fs.createReadStream("some-file").pipe(block)
11
block.pipe(fs.createWriteStream("block-file"))
14
When `.end()` or `.flush()` is called, it'll pad the block with zeroes.