init dump

Sources/JolkEngine/Util/FileHandle.swift

@@ -0,0 +1,20 @@
+import Foundation
+
+
+extension FileHandle
+{
+	// FixedWidthInteger or BinaryFloatingPoint
+	func read<T: FixedWidthInteger>(as: T.Type) throws -> T
+	{
+		let size = MemoryLayout<T>.size
+		guard let data = try self.read(upToCount: size)
+		else { throw NSError(domain: "FileHandle.read", code: NSFileReadUnknownError, userInfo: [
+			NSLocalizedFailureReasonErrorKey: "Read error",
+			NSLocalizedDescriptionKey: "Read error"]) }
+		guard data.count == size
+		else { throw NSError(domain: "FileHandle.read", code: NSFileReadUnknownError, userInfo: [
+			NSLocalizedFailureReasonErrorKey: "Value underread",
+			NSLocalizedDescriptionKey: "Value underread"]) }
+		return data.withUnsafeBytes { p -> T in p.load(as: T.self) }
+	}
+}