fix buffered reads

blockstore/splitstore/checkpoint.go

@@ -90,7 +90,7 @@ func readRawCid(buf *bufio.Reader, hbuf []byte) (cid.Cid, error) {
 		hbuf = hbuf[:int(sz)]
 	}
 
-	if _, err := buf.Read(hbuf); err != nil {
+	if _, err := io.ReadFull(buf, hbuf); err != nil {
 		return cid.Undef, xerrors.Errorf("error reading hash: %w", err) // wrap EOF, it's corrupt
 	}
 

blockstore/splitstore/markset_map.go

@@ -71,7 +71,7 @@ func (e *MapMarkSetEnv) Recover(name string) (MarkSet, error) {
 		}
 
 		key := make([]byte, int(sz))
-		if _, err = buf.Read(key); err != nil {
+		if _, err = io.ReadFull(buf, key); err != nil {
 			break
 		}