Moved checksum to it own extension file

BXSwiftUtils.xcodeproj/project.pbxproj

@@ -148,6 +148,8 @@
 		D06CC9242178C5F9009C2991 /* Data+Mutation.swift in Sources */ = {isa = PBXBuildFile; fileRef = D06CC9222178C5F9009C2991 /* Data+Mutation.swift */; };
 		D06CC9272178D209009C2991 /* Data+MutationTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = D06CC9262178D209009C2991 /* Data+MutationTests.swift */; };
 		D06CC9282178D209009C2991 /* Data+MutationTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = D06CC9262178D209009C2991 /* Data+MutationTests.swift */; };
+		D06CC92B2178EADA009C2991 /* Data+Checksum.swift in Sources */ = {isa = PBXBuildFile; fileRef = D06CC92A2178EADA009C2991 /* Data+Checksum.swift */; };
+		D06CC92C2178EADA009C2991 /* Data+Checksum.swift in Sources */ = {isa = PBXBuildFile; fileRef = D06CC92A2178EADA009C2991 /* Data+Checksum.swift */; };
 		D06F462D209073D0000986B8 /* Collection+Codable.swift in Sources */ = {isa = PBXBuildFile; fileRef = D06F462C209073D0000986B8 /* Collection+Codable.swift */; };
 		D06F462E209073D0000986B8 /* Collection+Codable.swift in Sources */ = {isa = PBXBuildFile; fileRef = D06F462C209073D0000986B8 /* Collection+Codable.swift */; };
 		D0859FD12158F7DD00F624C7 /* URL+Contents.swift in Sources */ = {isa = PBXBuildFile; fileRef = D0859FD02158F7DD00F624C7 /* URL+Contents.swift */; };
@@ -273,6 +275,7 @@
 		D06CC91E2178B089009C2991 /* String+RegexTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "String+RegexTests.swift"; sourceTree = "<group>"; };
 		D06CC9222178C5F9009C2991 /* Data+Mutation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Data+Mutation.swift"; sourceTree = "<group>"; };
 		D06CC9262178D209009C2991 /* Data+MutationTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Data+MutationTests.swift"; sourceTree = "<group>"; };
+		D06CC92A2178EADA009C2991 /* Data+Checksum.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Data+Checksum.swift"; sourceTree = "<group>"; };
 		D06F462C209073D0000986B8 /* Collection+Codable.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Collection+Codable.swift"; sourceTree = "<group>"; };
 		D0859FD02158F7DD00F624C7 /* URL+Contents.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "URL+Contents.swift"; sourceTree = "<group>"; };
 		D0859FD32158F7E200F624C7 /* URL+ExtendedAttributes.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "URL+ExtendedAttributes.swift"; sourceTree = "<group>"; };
@@ -639,6 +642,7 @@
 		D06CC9252178C619009C2991 /* Data */ = {
 			isa = PBXGroup;
 			children = (
+				D06CC92A2178EADA009C2991 /* Data+Checksum.swift */,
 				D06CC9222178C5F9009C2991 /* Data+Mutation.swift */,
 			);
 			path = Data;
@@ -890,6 +894,7 @@
 				D03234FF205C2919003D6CCB /* CGPoint+Operators.swift in Sources */,
 				481A25C02175D38700FB8E9A /* CACornerMask+Convenience.swift in Sources */,
 				D03F13B820F36D57004C8306 /* MTLComputeCommandEncoder+Extensions.swift in Sources */,
+				D06CC92C2178EADA009C2991 /* Data+Checksum.swift in Sources */,
 				D0EA52DA20F8992300A0EF6D /* MTKTextureLoader+Extensions.swift in Sources */,
 				48A971DA2158F75800215F9F /* Equatable+IsContainedIn.swift in Sources */,
 				4875F2512051EEF5009985EC /* Collection+SafeAccess.swift in Sources */,
@@ -983,6 +988,7 @@
 				48A971DB2158F75800215F9F /* Equatable+IsContainedIn.swift in Sources */,
 				481A25C12175D38700FB8E9A /* CACornerMask+Convenience.swift in Sources */,
 				4875F276205299F7009985EC /* Array+Concatenation.swift in Sources */,
+				D06CC92B2178EADA009C2991 /* Data+Checksum.swift in Sources */,
 				481BE6D42098362C00F12EDF /* Sequence+CompactMap.swift in Sources */,
 				D0149008213D566500A38870 /* KVO+propagateChanges.swift in Sources */,
 				487A39CE2069174E007BEC66 /* TypedKVO.swift in Sources */,

BXSwiftUtils/Data/Data+Checksum.swift

@@ -0,0 +1,33 @@
+//**********************************************************************************************************************
+//
+//  Data+Checksum.swift
+//  Adds a checksum property
+//  Copyright ©2018 Peter Baumgartner. All rights reserved.
+//
+//**********************************************************************************************************************
+
+
+import Foundation
+
+
+//----------------------------------------------------------------------------------------------------------------------
+
+
+public extension Data
+{
+
+	/// Calculates the checksum of the bytes contained in self
+	///
+	/// Please note that the checksum is masked with 0xFF, so it will always be in the range 0...255
+
+    public var checksum : Int
+    {
+        return self
+        	.map { Int($0) }
+        	.reduce(0,+)
+        	& 0xff
+    }
+
+}
+
+//----------------------------------------------------------------------------------------------------------------------

BXSwiftUtils/Data/Data+Mutation.swift

@@ -23,7 +23,7 @@ public extension Data
 	/// for this maximum number.
 	///
 	/// - parameter data: The data to be xored onto self
-	/// - parameter maximumRepeatCount: The maximum repetion of data, or unlimited for 0
+	/// - parameter maximumRepeatCount: The maximum repetition of data (pass 0 for unlimited)
 
     public mutating func xor(with data: Data, maximumRepeatCount: Int = 0)
     {
@@ -67,22 +67,7 @@ public extension Data
 		return copy
 	}
 
-
-//----------------------------------------------------------------------------------------------------------------------
-
-
-	/// Calculates the checksum of the bytes contained in self
-	///
-	/// Please note that the checksum is masked with 0xFF, so it will always be in the range 0...255
-
-    public var checksum : Int
-    {
-        return self
-        	.map { Int($0) }
-        	.reduce(0,+)
-        	& 0xff
-    }
-
 }
 
+
 //----------------------------------------------------------------------------------------------------------------------