Update for Xcode 12 & SPM

.gitignore

@@ -1,3 +1,48 @@
-xcuserdata/
+# Created by https://www.toptal.com/developers/gitignore/api/xcode,swiftpackagemanager
+# Edit at https://www.toptal.com/developers/gitignore?templates=xcode,swiftpackagemanager
+
+.DS_STORE
+
+### SwiftPackageManager ###
+Packages
+.build/
+xcuserdata
 DerivedData/
-.DS_Store
+*.xcodeproj
+
+
+### Xcode ###
+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## User settings
+xcuserdata/
+
+## compatibility with Xcode 8 and earlier (ignoring not required starting Xcode 9)
+*.xcscmblueprint
+*.xccheckout
+
+## compatibility with Xcode 3 and earlier (ignoring not required starting Xcode 4)
+build/
+*.moved-aside
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+
+## Gcc Patch
+/*.gcno
+
+### Xcode Patch ###
+*.xcodeproj/*
+!*.xcodeproj/project.pbxproj
+!*.xcodeproj/xcshareddata/
+!*.xcworkspace/contents.xcworkspacedata
+**/xcshareddata/WorkspaceSettings.xcsettings
+
+# End of https://www.toptal.com/developers/gitignore/api/xcode,swiftpackagemanager

Package.swift

@@ -0,0 +1,38 @@
+// 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: "SwiftZSTD",
+    products: [
+        .library(
+            name: "SwiftZSTD",
+            targets: ["SwiftZSTD", "SwiftZSTDC", "zstdlib"]),
+    ],
+    dependencies: [],
+    targets: [
+        .target(
+            name: "SwiftZSTD",
+            dependencies: ["SwiftZSTDC", "zstdlib"]),
+        .target(
+            name: "SwiftZSTDC",
+            dependencies: ["zstdlib"],
+            publicHeadersPath: "include"),
+        .target(
+            name: "zstdlib",
+            dependencies: [],
+            exclude: ["LICENSE"],
+            publicHeadersPath: "include",
+            cSettings: [
+                .headerSearchPath("common"),
+                .headerSearchPath("compress"),
+                .headerSearchPath("decompress"),
+                .headerSearchPath("dictBuilder"),
+                .headerSearchPath("include/zstdlib")
+            ]),
+        .testTarget(
+            name: "SwiftZSTDTests",
+            dependencies: ["SwiftZSTD"]),
+    ]
+)

Sources/DictionaryZSTDProcessor.swift → Sources/SwiftZSTD/DictionaryZSTDProcessor.swift

@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import zstdlib
 
 /**
  * A class to compress a buffer into a frame or to decompress a frame using a 

Sources/ZSTDDictionaryBuilder.swift → Sources/SwiftZSTD/ZSTDDictionaryBuilder.swift

@@ -6,6 +6,8 @@
 //
 
 import Foundation
+import zstdlib
+import SwiftZSTDC
 
 /**
  * Exceptions thrown by the dictionary builder.

Sources/ZSTDProcessor.swift → Sources/SwiftZSTD/ZSTDProcessor.swift

@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import zstdlib
 
 /**
  * Class that supports compression/decompression of an in-memory buffer without using

Sources/ZSTDProcessorCommon.swift → Sources/SwiftZSTD/ZSTDProcessorCommon.swift

@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import zstdlib
 
 /**
  * Types of exceptions thrown by the wrapper.

Sources/ZSTDStream.swift → Sources/SwiftZSTD/ZSTDStream.swift

@@ -7,6 +7,7 @@
 //
 
 import Foundation
+import SwiftZSTDC
 
 /**
  * Types of exceptions that can be thrown when using stream operations.

Sources/StreamHelpers.h → Sources/SwiftZSTDC/StreamHelpers.h

@@ -6,7 +6,7 @@
 //
 //
 
-#import "zstd.h"
+#import <zstdlib/zstd.h>
 
 @interface CompressionOC : NSObject
 

Sources/StreamHelpers.m → Sources/SwiftZSTDC/StreamHelpers.m

@@ -7,7 +7,7 @@
 //
 
 #import <Foundation/Foundation.h>
-#import <StreamHelpers.h>
+#import "StreamHelpers.h"
 
 @implementation CompressionOC {
     ZSTD_CStream * cStream;

SwiftZSTD_macOS/SwiftZSTD.h → Sources/SwiftZSTDC/include/SwiftZSTDC/SwiftZSTDC.h

@@ -6,7 +6,11 @@
 //
 //
 
-#import <Cocoa/Cocoa.h>
+#if __has_include(<UIKit/UIKit.h>)
+    #import <UIKit/UIKit.h>
+#else
+    #import <Cocoa/Cocoa.h>
+#endif
 
 //! Project version number for SwiftZSTD_macOS.
 FOUNDATION_EXPORT double SwiftZSTDVersionNumber;
@@ -16,9 +20,9 @@ FOUNDATION_EXPORT const unsigned char SwiftZSTDVersionString[];
 
 // In this header, you should import all the public headers of your framework using statements like #import <SwiftZSTD_macOS/PublicHeader.h>
 
-//#import "zstd.h"
-#import "zdict.h"
+#import <zstdlib/zstd.h>
+#import <zstdlib/zdict.h>
 
-#import "StreamHelpers.h"
+#import "../../StreamHelpers.h"