Starting work on ExtractTo from File

When using ExtractTo, will automatically set the correct permissions
Will also be able to extract folders

file.go

@@ -3,6 +3,7 @@ package squashfs
 import (
 	"errors"
 	"io"
+	"os"
 	"strings"
 
 	"github.com/CalebQ42/squashfs/internal/directory"
@@ -173,6 +174,20 @@ func (f *File) GetSymlinkFile() *File {
 	return f.r.GetFileAtPath(f.SymlinkPath())
 }
 
+//Permission returns the os.FileMode of the File. Currently only has the permission bits (the last 9) populated.
+func (f *File) Permission() os.FileMode {
+	//TODO: possibly populate more os.FileMode bits
+	return os.FileMode(f.in.Header.Permissions)
+}
+
+func (f *File) ExtractTo(path string) error {
+	if f.IsDir() {
+		//TODO
+	} else if f.IsSymlink() {
+
+	}
+}
+
 //Close frees up the memory held up by the underlying reader. Should NOT be called when writing.
 //When reading, Close is safe to use, but any subsequent Read calls resets to the beginning of the file.
 func (f *File) Close() error {

squash_test.go

@@ -71,3 +71,40 @@ func downloadTestAppImage(t *testing.T, dir string) {
 		t.Fatal(err)
 	}
 }
+
+func TestCreateSquashFromAppImage(t *testing.T) {
+	wd, err := os.Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = os.Mkdir(wd+"/testing", 0777)
+	if err != nil && !os.IsExist(err) {
+		t.Fatal(err)
+	}
+	_, err = os.Open(wd + "/testing/" + appImageName)
+	if os.IsNotExist(err) {
+		downloadTestAppImage(t, wd+"/testing")
+		_, err = os.Open(wd + "/testing/" + appImageName)
+		if err != nil {
+			t.Fatal(err)
+		}
+	} else if err != nil {
+		t.Fatal(err)
+	}
+	ai := goappimage.NewAppImage(wd + "/testing/" + appImageName)
+	aiFil, err := os.Open(wd + "/testing/" + appImageName)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer aiFil.Close()
+	aiFil.Seek(ai.Offset, 0)
+	os.Remove(wd + "/testing/" + appImageName + ".squashfs")
+	aiSquash, err := os.Create(wd + "/testing/" + appImageName + ".squashfs")
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = io.Copy(aiSquash, aiFil)
+	if err != nil {
+		t.Fatal(err)
+	}
+}