From 6b8c90f0bdc79fdc33ebf697cf76f7f462b987db Mon Sep 17 00:00:00 2001
From: Timofey Solomko <tsolomko@gmail.com>
Date: Sat, 11 Nov 2017 11:46:22 +0300
Subject: [PATCH] FileSystemType properties can no longer be nil

---
 Sources/GZip/FileSystemType+Gzip.swift | 6 ++----
 Sources/GZip/GzipHeader.swift          | 3 +--
 Sources/ZIP/FileSystemType+Zip.swift   | 6 ++----
 Sources/ZIP/ZipEntryInfo.swift         | 2 +-
 4 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/Sources/GZip/FileSystemType+Gzip.swift b/Sources/GZip/FileSystemType+Gzip.swift
index 4a9ec0b0..98bde995 100644
--- a/Sources/GZip/FileSystemType+Gzip.swift
+++ b/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
         }
     }
 
diff --git a/Sources/GZip/GzipHeader.swift b/Sources/GZip/GzipHeader.swift
index 186ee1bd..e50bf9e6 100644
--- a/Sources/GZip/GzipHeader.swift
+++ b/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?
diff --git a/Sources/ZIP/FileSystemType+Zip.swift b/Sources/ZIP/FileSystemType+Zip.swift
index 6f70e029..0d0ffab0 100644
--- a/Sources/ZIP/FileSystemType+Zip.swift
+++ b/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
         }
     }
 
diff --git a/Sources/ZIP/ZipEntryInfo.swift b/Sources/ZIP/ZipEntryInfo.swift
index 26554d59..078a9e49 100644
--- a/Sources/ZIP/ZipEntryInfo.swift
+++ b/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