Init a BInt from a [UInt8] (#56)

* Updating project settings

* Init a `BInt` from a `[UInt8]`

* Get bytes `[UInt8]` from `BInt`

* Adding `Byte` and `Bytes` type aliases

Author: Nathan Fallet

Sources/Swift-Big-Number-Core.swift

@@ -121,6 +121,11 @@ public typealias Limb   =  UInt64
 public typealias Digits = [UInt64]
 public typealias Digit  =  UInt64
 
+//	Bytes allow to initialize and export BInt for operations like network related ones.
+
+public typealias Bytes  = [UInt8]
+public typealias Byte   =  UInt8
+
 //	MARK: - Imports
 //	————————————————————————————————————————————————————————————————————————————————————————————
 //	||||||||        Operators        |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
@@ -432,6 +437,19 @@ public struct BInt:
 	{
 		self.init(source)
 	}
+	
+	/// Creates a new instance from a `[UInt8]` array
+	public init(bytes: Bytes)
+	{
+		var num = BInt()
+		
+		for byte in bytes
+		{
+			num = num << 8 | BInt(byte)
+		}
+		
+		self.init(sign: num.sign, limbs: num.limbs)
+	}
 
 	//
 	//
@@ -551,6 +569,20 @@ public struct BInt:
 			i += 1
 		}
 	}
+	
+	/// Bytes of the number
+	public func getBytes() -> Bytes
+	{
+		var bytes = Bytes()
+		var copy = self
+		
+		while copy != 0 {
+			bytes.append(Byte(copy & 0xff))
+			copy >>= 8
+		}
+		
+		return bytes.reversed()
+	}
 
 	//
 	//

Swift-BigNumber.xcodeproj/project.pbxproj

@@ -364,7 +364,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0920;
-				LastUpgradeCheck = 0940;
+				LastUpgradeCheck = 1250;
 				ORGANIZATIONNAME = "Marcel Kröker";
 				TargetAttributes = {
 					AE8388A5203F1CAF00FAC88F = {
@@ -546,7 +546,7 @@
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				INFOPLIST_FILE = "BigNumber-iOS/Info.plist";
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 11.3;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "com.yuzushioh.BigNumber-iOS";
 				PRODUCT_NAME = BigNumber;
@@ -577,7 +577,7 @@
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				INFOPLIST_FILE = "BigNumber-iOS/Info.plist";
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 11.3;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "com.yuzushioh.BigNumber-iOS";
 				PRODUCT_NAME = BigNumber;
@@ -604,7 +604,7 @@
 				DEVELOPMENT_TEAM = "";
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				INFOPLIST_FILE = "BigNumber-iOSTests/Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 11.2;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "com.yuzushioh.BigNumber-iOSTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -628,7 +628,7 @@
 				DEVELOPMENT_TEAM = "";
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				INFOPLIST_FILE = "BigNumber-iOSTests/Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 11.2;
+				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "com.yuzushioh.BigNumber-iOSTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -663,6 +663,7 @@
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
@@ -720,6 +721,7 @@
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;

Tests/Test_Initialization.swift

@@ -34,6 +34,22 @@ class Test_Initialization: XCTestCase {
 		XCTAssert(b.rawValue.limbs == [0, 0, 0, 0, 1])
     }
 
+    func testBytes()
+    {
+        // Bytes and expected number
+        // 0x0102030405 is 4328719365 in decimal
+        let array: Bytes = [0x01, 0x02, 0x03, 0x04, 0x05]
+        let expected: Int = 4328719365
+        
+        // Init from bytes (array)
+        let b = BInt(bytes: array)
+        XCTAssertEqual(b.description, expected.description)
+        
+        // Convert back to bytes
+        let bytes = b.getBytes()
+        XCTAssertEqual(bytes, array)
+    }
+    
     func testCodable() {
         for i in 0..<50 {
             let one = BInt(i)