Removed all the pointers

low/data/fullreader.go

@@ -4,6 +4,7 @@ import (
 	"encoding/binary"
 	"errors"
 	"io"
+	"io/fs"
 	"math"
 	"runtime"
 	"sync"
@@ -23,10 +24,11 @@ type FullReader struct {
 	finalBlockSize uint64
 	blockSize      uint32
 	goroutineLimit uint16
+	closed         bool
 }
 
-func NewFullReader(r io.ReaderAt, initialOffset int64, d decompress.Decompressor, sizes []uint32, finalBlockSize uint64, blockSize uint32) *FullReader {
-	return &FullReader{
+func NewFullReader(r io.ReaderAt, initialOffset int64, d decompress.Decompressor, sizes []uint32, finalBlockSize uint64, blockSize uint32) FullReader {
+	return FullReader{
 		r:              r,
 		d:              d,
 		sizes:          sizes,
@@ -37,6 +39,15 @@ func NewFullReader(r io.ReaderAt, initialOffset int64, d decompress.Decompressor
 	}
 }
 
+func (r *FullReader) Close() error {
+	r.closed = true
+	r.r = nil
+	r.d = nil
+	r.frag = nil
+	r.sizes = nil
+	return nil
+}
+
 func (r *FullReader) AddFrag(frag FragReaderConstructor) {
 	r.frag = frag
 }
@@ -77,6 +88,9 @@ func (r FullReader) process(index uint64, fileOffset uint64, pool *sync.Pool, re
 }
 
 func (r FullReader) WriteTo(w io.Writer) (int64, error) {
+	if r.closed {
+		return 0, fs.ErrClosed
+	}
 	// if wa, is := w.(io.WriterAt); is {
 	// 	return r.writeToWriteAt(wa)
 	// }