update: add the package page

lib/util.go

@@ -1,13 +1,41 @@
 package lib
 
 import (
+	"archive/tar"
+	"compress/gzip"
 	"fmt"
+	"io"
 	"strings"
 	"time"
 
 	"github.com/gofiber/fiber/v2"
 )
 
+func GetFiles(r io.Reader) ([]string, error) {
+	var (
+		gzip_reader io.Reader
+		header      *tar.Header
+		result      []string
+		err         error
+	)
+
+	if gzip_reader, err = gzip.NewReader(r); err != nil {
+		return result, err
+	}
+
+	reader := tar.NewReader(gzip_reader)
+
+	for header, err = reader.Next(); err == nil; header, err = reader.Next() {
+		if header.Typeflag != tar.TypeReg {
+			continue
+		}
+
+		result = append(result, header.Name)
+	}
+
+	return result, nil
+}
+
 func ListToStr(l []string) string {
 	res := ""
 	for _, e := range l {