Add support for swift package manager.

Classes/NVHGzipFile.m

@@ -26,7 +26,7 @@ typedef NS_ENUM(NSInteger, NVHGzipFileErrorType)
 
 @interface NVHGzipFile ()
 
-@property (nonatomic,assign) CGFloat fileSizeFraction;
+@property (nonatomic,assign) double fileSizeFraction;
 
 @end
 

Classes/NVHTarFile.m

@@ -32,7 +32,7 @@
 
 // Logging mode
 // Comment this line for production
-//#define TAR_VERBOSE_LOG_MODE
+// #define TAR_VERBOSE_LOG_MODE
 
 // const definition
 #define TAR_BLOCK_SIZE                  512
@@ -243,6 +243,20 @@ - (BOOL)createFilesAndDirectoriesAtPath:(NSString *)path withTarObject:(id)objec
                 break;
             }
 
+            // This fixes the following issue for tar files genetrated on the mac...
+            // https://github.com/nvh/NVHTarGzip/issues/8
+            case ' ': // .DS_Store filea manifest with an empty string as their type.
+            {
+#ifdef TAR_VERBOSE_LOG_MODE
+                NSLog(@"UNTAR - unsupported block");
+#endif
+                @autoreleasepool {
+                    unsigned long long objectSize = [NVHTarFile sizeForObject:object atOffset:location];
+                    blockCount += ceil(objectSize / TAR_BLOCK_SIZE);
+                }
+                break;
+            }
+
             default: // It's not a tar type
             {
                 NSDictionary *userInfo = [NSDictionary dictionaryWithObject:@"Invalid block type found"

Package.swift

@@ -0,0 +1,25 @@
+// swift-tools-version:5.3
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+import PackageDescription
+
+let package = Package(
+    name: "NVHTarGzip",
+    defaultLocalization: "en",
+    platforms: [
+        .iOS(.v12),
+        .tvOS(.v12),
+        .macOS(.v10_13),
+    ],
+    products: [
+        .library(
+            name: "NVHTarGzip", targets: ["NVHTarGzip"]),
+    ],
+    dependencies: [
+    ],
+    targets: [
+        .target(name: "NVHTarGzip",
+                path: "Classes",
+                publicHeadersPath: ""),
+    ]
+)
+