1 files changed, 19 insertions, 0 deletions
diff --git a/internal/vfs/zip/archive.go b/internal/vfs/zip/archive.go
index 2b04310d..23ad7b2e 100644
--- a/internal/vfs/zip/archive.go
+++ b/internal/vfs/zip/archive.go
@@ -239,6 +239,25 @@ func (a *zipArchive) Open(ctx context.Context, name string) (vfs.File, error) {
 	}
 }
 
+// IsCompressed finds the file by name and checks its compression method. If the method is
+// zip.Store it means it's not compressed.
+// Returns errNotFile for directories or non-regular files.
+func (a *zipArchive) IsCompressed(name string) (bool, error) {
+	file := a.findFile(name)
+	if file == nil {
+		if a.findDirectory(name) != nil {
+			return false, errNotFile
+		}
+		return false, os.ErrNotExist
+	}
+
+	if !file.Mode().IsRegular() {
+		return false, errNotFile
+	}
+
+	return file.Method != zip.Store, nil
+}
+
 // Lstat finds the file by name inside the zipArchive and returns its FileInfo
 func (a *zipArchive) Lstat(ctx context.Context, name string) (os.FileInfo, error) {
 	file := a.findFile(name)