FileSystemType properties can no longer be nil

Sources/GZip/FileSystemType+Gzip.swift

@@ -7,7 +7,7 @@ import Foundation
 
 extension FileSystemType {
 
-    init?(_ gzipOS: UInt8) {
+    init(_ gzipOS: UInt8) {
         switch gzipOS {
         case 0:
             self = .fat
@@ -17,10 +17,8 @@ extension FileSystemType {
             self = .macintosh
         case 11:
             self = .ntfs
-        case 1, 2, 4, 5, 6, 8, 9, 10, 12, 13, 255:
-            self = .other
         default:
-            return nil
+            self = .other
         }
     }
 

Sources/GZip/GzipHeader.swift

@@ -32,9 +32,8 @@ public struct GzipHeader {
      */
     public let modificationTime: Date?
 
-    // TODO: Explain why can be nil?
     /// Type of file system on which archivation took place.
-    public let osType: FileSystemType?
+    public let osType: FileSystemType
 
     /// Name of the original file. If archive doesn't contain file's name, then `nil`.
     public let fileName: String?

Sources/ZIP/FileSystemType+Zip.swift

@@ -7,7 +7,7 @@ import Foundation
 
 extension FileSystemType {
 
-    init?(_ versionMadeBy: UInt16) {
+    init(_ versionMadeBy: UInt16) {
         switch (versionMadeBy & 0xFF00) >> 8 {
         case 0, 14:
             self = .fat
@@ -17,10 +17,8 @@ extension FileSystemType {
             self = .macintosh
         case 10:
             self = .ntfs
-        case 1, 2, 4, 5, 6, 8, 9, 11, 12, 13, 15, 16, 17, 18:
-            self = .other
         default:
-            return nil
+            self = .other
         }
     }
 

Sources/ZIP/ZipEntryInfo.swift

@@ -37,7 +37,7 @@ public struct ZipEntryInfo: ContainerEntryInfo {
     /// True, if entry is likely to be text or ASCII file.
     public let isTextFile: Bool
 
-    public let fileSystemType: FileSystemType?
+    public let fileSystemType: FileSystemType
 
     public let compressionMethod: CompressionMethod