     private(set) var compSize: UInt64
     private(set) var uncompSize: UInt64
 
-    let fileName: String?
+    let fileName: String
 
     init(_ pointerData: inout DataWithPointer) throws {
         // Check signature.

            }
        }

        self.fileComment = String(data: Data(bytes: pointerData.alignedBytes(count: fileCommentLength)),
                                 encoding: .utf8)

        // Let's check entry's values for consistency.
        guard self.versionNeeded <= 45

    private(set) var compSize: UInt64
    private(set) var uncompSize: UInt64

    let fileName: String
    let fileComment: String?

    private(set) var diskNumberStart: UInt32
