Add two proeprties to TarEntryInfo which indicate if it is an extended header

Sources/TAR/TarContainer.swift

@@ -80,12 +80,11 @@ public class TarContainer: Container {
 
             let entry = TarEntry(info, data)
 
-            switch info.tarType {
-            case .globalExtendedHeader:
+            if info.isGlobalExtendedHeader {
                 lastGlobalExtendedHeader = String(data: entry.data!, encoding: .utf8)
-            case .localExtendedHeader:
+            } else if info.isLocalExtendedHeader {
                 lastLocalExtendedHeader = String(data: entry.data!, encoding: .utf8)
-            default:
+            } else {
                 output.append(entry)
                 lastLocalExtendedHeader = nil
                 longName = nil

Sources/TAR/TarEntryInfo.swift

@@ -123,6 +123,9 @@ public class TarEntryInfo: ContainerEntryInfo {
     private let gnuLongName: String?
     private let gnuLongLinkName: String?
 
+    let isGlobalExtendedHeader: Bool
+    let isLocalExtendedHeader: Bool
+
     let blockStartIndex: Int
 
     init(_ pointerData: DataWithPointer, _ globalExtendedHeader: String?, _ localExtendedHeader: String?,
@@ -220,6 +223,8 @@ public class TarEntryInfo: ContainerEntryInfo {
         default:
             attributesDict[FileAttributeKey.type] = FileAttributeType.typeUnknown
         }
+        self.isGlobalExtendedHeader = fileTypeIndicator == "g"
+        self.isLocalExtendedHeader = fileTypeIndicator == "x"
 
         // Linked file name
         linkedFileName = try pointerData.nullEndedAsciiString(cutoff: 100)