Create a pool for each folder

reader.go

@@ -16,6 +16,7 @@ import (
 	"time"
 
 	"github.com/bodgit/plumbing"
+	"github.com/bodgit/sevenzip/internal/pool"
 	"github.com/bodgit/sevenzip/internal/util"
 	"github.com/bodgit/windows"
 	"github.com/hashicorp/go-multierror"
@@ -33,13 +34,16 @@ var (
 	errIncompleteRead = errors.New("sevenzip: incomplete read")
 )
 
+var newPool pool.Constructor = pool.NewPool
+
 type Reader struct {
 	r     io.ReaderAt
 	start int64
 	end   int64
 	si    *streamsInfo
 	p     string
 	File  []*File
+	pool  []pool.Pooler
 }
 
 type ReadCloser struct {
@@ -1077,6 +1081,13 @@ func (z *Reader) init(r io.ReaderAt, size int64) error {
 
 	z.si = header.streamsInfo
 
+	z.pool = make([]pool.Pooler, z.si.Folders())
+	for i := range z.pool {
+		if z.pool[i], err = newPool(); err != nil {
+			return err
+		}
+	}
+
 	// spew.Dump(header)
 
 	folder, offset := 0, int64(0)

struct.go

@@ -222,7 +222,11 @@ type streamsInfo struct {
 }
 
 func (si *streamsInfo) Folders() int {
-	return len(si.unpackInfo.folder)
+	if si != nil && si.unpackInfo != nil {
+		return len(si.unpackInfo.folder)
+	}
+
+	return 0
 }
 
 func (si *streamsInfo) FileFolderAndSize(file int) (int, uint64) {