Implement chunking.

Move from rpc to separate util package.

rpc/bytestream.go

@@ -1,26 +0,0 @@
-package rpc
-
-struct Unchunker {
-	In 	io.Reader
-	internalBuffer []byte
-	remainingChunkSize uint
-}
-
-func NewUnchunker(conn io.Reader) {
-	return Unchunker{In: conn} // TODO
-}
-
-func (c Unchunker) Read(b []byte) (n int, error) {
-	// read min(c.internalBuffer.len, b.len) from c.internalBuffer into b
-	// fill up internalBuffer
-	//  1 read up to max(remainingChunkSize,internalBuffer.len) from In
-	//  2 if remainingChunkSize == 0, read next chunk size, update remainingChunkSize
-	//  3 goto 1
-}
-
-struct Chunker {
-	In io.Reader
-	MaxChunkSize uint
-
-	ChunkBuf []byte // length of buf determines chunk size? --> would be fixed then
-}