//
//  SocketUtils.swift
//  BlueSocket
//
//  Created by Bill Abt on 11/19/15.
//  Copyright © 2016 IBM. All rights reserved.
//
// 	Licensed under the Apache License, Version 2.0 (the "License");
// 	you may not use this file except in compliance with the License.
// 	You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// 	Unless required by applicable law or agreed to in writing, software
// 	distributed under the License is distributed on an "AS IS" BASIS,
// 	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// 	See the License for the specific language governing permissions and
// 	limitations under the License.
//

#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS)
	import Darwin
#elseif os(Linux)
	import Glibc
#endif

import Foundation

// MARK: sockaddr_storage Extension

public extension sockaddr_storage {
	
	///
	/// Cast to sockaddr
	///
	/// - Returns: sockaddr
	///
	public func asAddr() -> sockaddr {
		
		var temp = self
		let addr = withUnsafePointer(to: &temp) {
			return UnsafeRawPointer($0)
		}
		return addr.assumingMemoryBound(to: sockaddr.self).pointee
		
	}
	
	///
	/// Cast to sockaddr_in
	///
	/// - Returns: sockaddr_in
	///
	public func asIPV4() -> sockaddr_in {
		
		var temp = self
		let addr = withUnsafePointer(to: &temp) {
			return UnsafeRawPointer($0)
		}
		return addr.assumingMemoryBound(to: sockaddr_in.self).pointee
	}
	
	///
	/// Cast to sockaddr_in6
	///
	/// - Returns: sockaddr_in6
	///
	public func asIPV6() -> sockaddr_in6 {
		
		var temp = self
		let addr = withUnsafePointer(to: &temp) {
			return UnsafeRawPointer($0)
		}
		return addr.assumingMemoryBound(to: sockaddr_in6.self).pointee
	}
}

// MARK: sockaddr_in Extension

public extension sockaddr_in {
	
	///
	/// Cast to sockaddr
	///
	/// - Returns: sockaddr
	///
	public func asAddr() -> sockaddr {
		
		var temp = self
		let addr = withUnsafePointer(to: &temp) {
			return UnsafeRawPointer($0)
		}
		return addr.assumingMemoryBound(to: sockaddr.self).pointee
	}
}

// MARK: sockaddr_in6 Extension

public extension sockaddr_in6 {
	
	///
	/// Cast to sockaddr
	///
	/// - Returns: sockaddr
	///
	public func asAddr() -> sockaddr {
		
		var temp = self
		let addr = withUnsafePointer(to: &temp) {
			return UnsafeRawPointer($0)
		}
		return addr.assumingMemoryBound(to: sockaddr.self).pointee
	}
}

#if arch(arm) && os(Linux)
	
	public struct FD {
		
		/// Replacement for FD_ZERO macro
		
		public static func ZERO(set: inout fd_set) {
			set.__fds_bits = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
		}
		
		
		/// Replacement for FD_SET macro
		
		public static func SET(fd: Int32, set: inout fd_set) {
			let intOffset = Int(fd / 32)
			let bitOffset: Int = Int(fd % 32)
			let mask: Int = 1 << bitOffset
			switch intOffset {
			case 0: set.__fds_bits.0 = set.__fds_bits.0 | mask
			case 1: set.__fds_bits.1 = set.__fds_bits.1 | mask
			case 2: set.__fds_bits.2 = set.__fds_bits.2 | mask
			case 3: set.__fds_bits.3 = set.__fds_bits.3 | mask
			case 4: set.__fds_bits.4 = set.__fds_bits.4 | mask
			case 5: set.__fds_bits.5 = set.__fds_bits.5 | mask
			case 6: set.__fds_bits.6 = set.__fds_bits.6 | mask
			case 7: set.__fds_bits.7 = set.__fds_bits.7 | mask
			case 8: set.__fds_bits.8 = set.__fds_bits.8 | mask
			case 9: set.__fds_bits.9 = set.__fds_bits.9 | mask
			case 10: set.__fds_bits.10 = set.__fds_bits.10 | mask
			case 11: set.__fds_bits.11 = set.__fds_bits.11 | mask
			case 12: set.__fds_bits.12 = set.__fds_bits.12 | mask
			case 13: set.__fds_bits.13 = set.__fds_bits.13 | mask
			case 14: set.__fds_bits.14 = set.__fds_bits.14 | mask
			case 15: set.__fds_bits.15 = set.__fds_bits.15 | mask
			case 16: set.__fds_bits.16 = set.__fds_bits.16 | mask
			case 17: set.__fds_bits.17 = set.__fds_bits.17 | mask
			case 18: set.__fds_bits.18 = set.__fds_bits.18 | mask
			case 19: set.__fds_bits.19 = set.__fds_bits.19 | mask
			case 20: set.__fds_bits.20 = set.__fds_bits.20 | mask
			case 21: set.__fds_bits.21 = set.__fds_bits.21 | mask
			case 22: set.__fds_bits.22 = set.__fds_bits.22 | mask
			case 23: set.__fds_bits.23 = set.__fds_bits.23 | mask
			case 24: set.__fds_bits.24 = set.__fds_bits.24 | mask
			case 25: set.__fds_bits.25 = set.__fds_bits.25 | mask
			case 26: set.__fds_bits.26 = set.__fds_bits.26 | mask
			case 27: set.__fds_bits.27 = set.__fds_bits.27 | mask
			case 28: set.__fds_bits.28 = set.__fds_bits.28 | mask
			case 29: set.__fds_bits.29 = set.__fds_bits.29 | mask
			case 30: set.__fds_bits.20 = set.__fds_bits.30 | mask
			case 31: set.__fds_bits.31 = set.__fds_bits.31 | mask
			default: break
			}
		}
		
		
		/// Replacement for FD_CLR macro
		
		public static func CLR(fd: Int32, set: inout fd_set) {
			let intOffset = Int(fd / 32)
			let bitOffset: Int = Int(fd % 32)
			let mask: Int = ~(1 << bitOffset)
			switch intOffset {
			case 0: set.__fds_bits.0 = set.__fds_bits.0 & mask
			case 1: set.__fds_bits.1 = set.__fds_bits.1 & mask
			case 2: set.__fds_bits.2 = set.__fds_bits.2 & mask
			case 3: set.__fds_bits.3 = set.__fds_bits.3 & mask
			case 4: set.__fds_bits.4 = set.__fds_bits.4 & mask
			case 5: set.__fds_bits.5 = set.__fds_bits.5 & mask
			case 6: set.__fds_bits.6 = set.__fds_bits.6 & mask
			case 7: set.__fds_bits.7 = set.__fds_bits.7 & mask
			case 8: set.__fds_bits.8 = set.__fds_bits.8 & mask
			case 9: set.__fds_bits.9 = set.__fds_bits.9 & mask
			case 10: set.__fds_bits.10 = set.__fds_bits.10 & mask
			case 11: set.__fds_bits.11 = set.__fds_bits.11 & mask
			case 12: set.__fds_bits.12 = set.__fds_bits.12 & mask
			case 13: set.__fds_bits.13 = set.__fds_bits.13 & mask
			case 14: set.__fds_bits.14 = set.__fds_bits.14 & mask
			case 15: set.__fds_bits.15 = set.__fds_bits.15 & mask
			case 16: set.__fds_bits.16 = set.__fds_bits.16 & mask
			case 17: set.__fds_bits.17 = set.__fds_bits.17 & mask
			case 18: set.__fds_bits.18 = set.__fds_bits.18 & mask
			case 19: set.__fds_bits.19 = set.__fds_bits.19 & mask
			case 20: set.__fds_bits.20 = set.__fds_bits.20 & mask
			case 21: set.__fds_bits.21 = set.__fds_bits.21 & mask
			case 22: set.__fds_bits.22 = set.__fds_bits.22 & mask
			case 23: set.__fds_bits.23 = set.__fds_bits.23 & mask
			case 24: set.__fds_bits.24 = set.__fds_bits.24 & mask
			case 25: set.__fds_bits.25 = set.__fds_bits.25 & mask
			case 26: set.__fds_bits.26 = set.__fds_bits.26 & mask
			case 27: set.__fds_bits.27 = set.__fds_bits.27 & mask
			case 28: set.__fds_bits.28 = set.__fds_bits.28 & mask
			case 29: set.__fds_bits.29 = set.__fds_bits.29 & mask
			case 30: set.__fds_bits.20 = set.__fds_bits.30 & mask
			case 31: set.__fds_bits.31 = set.__fds_bits.31 & mask
			default: break
			}
		}
		
		
		/// Replacement for FD_ISSET macro
		
		public static func ISSET(fd: Int32, set: inout fd_set) -> Bool {
			let intOffset = Int(fd / 32)
			let bitOffset = Int(fd % 32)
			let mask: Int = 1 << bitOffset
			switch intOffset {
			case 0: return set.__fds_bits.0 & mask != 0
			case 1: return set.__fds_bits.1 & mask != 0
			case 2: return set.__fds_bits.2 & mask != 0
			case 3: return set.__fds_bits.3 & mask != 0
			case 4: return set.__fds_bits.4 & mask != 0
			case 5: return set.__fds_bits.5 & mask != 0
			case 6: return set.__fds_bits.6 & mask != 0
			case 7: return set.__fds_bits.7 & mask != 0
			case 8: return set.__fds_bits.8 & mask != 0
			case 9: return set.__fds_bits.9 & mask != 0
			case 10: return set.__fds_bits.10 & mask != 0
			case 11: return set.__fds_bits.11 & mask != 0
			case 12: return set.__fds_bits.12 & mask != 0
			case 13: return set.__fds_bits.13 & mask != 0
			case 14: return set.__fds_bits.14 & mask != 0
			case 15: return set.__fds_bits.15 & mask != 0
			case 16: return set.__fds_bits.16 & mask != 0
			case 17: return set.__fds_bits.17 & mask != 0
			case 18: return set.__fds_bits.18 & mask != 0
			case 19: return set.__fds_bits.19 & mask != 0
			case 20: return set.__fds_bits.20 & mask != 0
			case 21: return set.__fds_bits.21 & mask != 0
			case 22: return set.__fds_bits.22 & mask != 0
			case 23: return set.__fds_bits.23 & mask != 0
			case 24: return set.__fds_bits.24 & mask != 0
			case 25: return set.__fds_bits.25 & mask != 0
			case 26: return set.__fds_bits.26 & mask != 0
			case 27: return set.__fds_bits.27 & mask != 0
			case 28: return set.__fds_bits.28 & mask != 0
			case 29: return set.__fds_bits.29 & mask != 0
			case 30: return set.__fds_bits.30 & mask != 0
			case 31: return set.__fds_bits.31 & mask != 0
			default: return false
			}
			
		}
	}
	
#elseif os(Linux)
	
	public struct FD {
		
		/// Replacement for FD_ZERO macro
		
		public static func ZERO(set: inout fd_set) {
			set.__fds_bits = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
		}
		
		
		/// Replacement for FD_SET macro
		
		public static func SET(fd: Int32, set: inout fd_set) {
			let intOffset = Int(fd / 16)
			let bitOffset: Int = Int(fd % 16)
			let mask: Int = 1 << bitOffset
			switch intOffset {
			case 0: set.__fds_bits.0 = set.__fds_bits.0 | mask
			case 1: set.__fds_bits.1 = set.__fds_bits.1 | mask
			case 2: set.__fds_bits.2 = set.__fds_bits.2 | mask
			case 3: set.__fds_bits.3 = set.__fds_bits.3 | mask
			case 4: set.__fds_bits.4 = set.__fds_bits.4 | mask
			case 5: set.__fds_bits.5 = set.__fds_bits.5 | mask
			case 6: set.__fds_bits.6 = set.__fds_bits.6 | mask
			case 7: set.__fds_bits.7 = set.__fds_bits.7 | mask
			case 8: set.__fds_bits.8 = set.__fds_bits.8 | mask
			case 9: set.__fds_bits.9 = set.__fds_bits.9 | mask
			case 10: set.__fds_bits.10 = set.__fds_bits.10 | mask
			case 11: set.__fds_bits.11 = set.__fds_bits.11 | mask
			case 12: set.__fds_bits.12 = set.__fds_bits.12 | mask
			case 13: set.__fds_bits.13 = set.__fds_bits.13 | mask
			case 14: set.__fds_bits.14 = set.__fds_bits.14 | mask
			case 15: set.__fds_bits.15 = set.__fds_bits.15 | mask
			default: break
			}
		}
		
		
		/// Replacement for FD_CLR macro
		
		public static func CLR(fd: Int32, set: inout fd_set) {
			let intOffset = Int(fd / 16)
			let bitOffset: Int = Int(fd % 16)
			let mask: Int = ~(1 << bitOffset)
			switch intOffset {
			case 0: set.__fds_bits.0 = set.__fds_bits.0 & mask
			case 1: set.__fds_bits.1 = set.__fds_bits.1 & mask
			case 2: set.__fds_bits.2 = set.__fds_bits.2 & mask
			case 3: set.__fds_bits.3 = set.__fds_bits.3 & mask
			case 4: set.__fds_bits.4 = set.__fds_bits.4 & mask
			case 5: set.__fds_bits.5 = set.__fds_bits.5 & mask
			case 6: set.__fds_bits.6 = set.__fds_bits.6 & mask
			case 7: set.__fds_bits.7 = set.__fds_bits.7 & mask
			case 8: set.__fds_bits.8 = set.__fds_bits.8 & mask
			case 9: set.__fds_bits.9 = set.__fds_bits.9 & mask
			case 10: set.__fds_bits.10 = set.__fds_bits.10 & mask
			case 11: set.__fds_bits.11 = set.__fds_bits.11 & mask
			case 12: set.__fds_bits.12 = set.__fds_bits.12 & mask
			case 13: set.__fds_bits.13 = set.__fds_bits.13 & mask
			case 14: set.__fds_bits.14 = set.__fds_bits.14 & mask
			case 15: set.__fds_bits.15 = set.__fds_bits.15 & mask
			default: break
			}
		}
		
		
		/// Replacement for FD_ISSET macro
		
		public static func ISSET(fd: Int32, set: inout fd_set) -> Bool {
			let intOffset = Int(fd / 16)
			let bitOffset = Int(fd % 16)
			let mask: Int = 1 << bitOffset
			switch intOffset {
			case 0: return set.__fds_bits.0 & mask != 0
			case 1: return set.__fds_bits.1 & mask != 0
			case 2: return set.__fds_bits.2 & mask != 0
			case 3: return set.__fds_bits.3 & mask != 0
			case 4: return set.__fds_bits.4 & mask != 0
			case 5: return set.__fds_bits.5 & mask != 0
			case 6: return set.__fds_bits.6 & mask != 0
			case 7: return set.__fds_bits.7 & mask != 0
			case 8: return set.__fds_bits.8 & mask != 0
			case 9: return set.__fds_bits.9 & mask != 0
			case 10: return set.__fds_bits.10 & mask != 0
			case 11: return set.__fds_bits.11 & mask != 0
			case 12: return set.__fds_bits.12 & mask != 0
			case 13: return set.__fds_bits.13 & mask != 0
			case 14: return set.__fds_bits.14 & mask != 0
			case 15: return set.__fds_bits.15 & mask != 0
			default: return false
			}
		}
	}
	
#else
	
	public struct FD {
		
		/// Replacement for FD_ZERO macro
		
		public static func ZERO(set: inout fd_set) {
			set.fds_bits = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
		}
		
		
		/// Replacement for FD_SET macro
		
		public static func SET(fd: Int32, set: inout fd_set) {
			let intOffset = Int(fd / 32)
			let bitOffset = fd % 32
			let mask = 1 << bitOffset
			switch intOffset {
			case 0: set.fds_bits.0 = set.fds_bits.0 | mask
			case 1: set.fds_bits.1 = set.fds_bits.1 | mask
			case 2: set.fds_bits.2 = set.fds_bits.2 | mask
			case 3: set.fds_bits.3 = set.fds_bits.3 | mask
			case 4: set.fds_bits.4 = set.fds_bits.4 | mask
			case 5: set.fds_bits.5 = set.fds_bits.5 | mask
			case 6: set.fds_bits.6 = set.fds_bits.6 | mask
			case 7: set.fds_bits.7 = set.fds_bits.7 | mask
			case 8: set.fds_bits.8 = set.fds_bits.8 | mask
			case 9: set.fds_bits.9 = set.fds_bits.9 | mask
			case 10: set.fds_bits.10 = set.fds_bits.10 | mask
			case 11: set.fds_bits.11 = set.fds_bits.11 | mask
			case 12: set.fds_bits.12 = set.fds_bits.12 | mask
			case 13: set.fds_bits.13 = set.fds_bits.13 | mask
			case 14: set.fds_bits.14 = set.fds_bits.14 | mask
			case 15: set.fds_bits.15 = set.fds_bits.15 | mask
			case 16: set.fds_bits.16 = set.fds_bits.16 | mask
			case 17: set.fds_bits.17 = set.fds_bits.17 | mask
			case 18: set.fds_bits.18 = set.fds_bits.18 | mask
			case 19: set.fds_bits.19 = set.fds_bits.19 | mask
			case 20: set.fds_bits.20 = set.fds_bits.20 | mask
			case 21: set.fds_bits.21 = set.fds_bits.21 | mask
			case 22: set.fds_bits.22 = set.fds_bits.22 | mask
			case 23: set.fds_bits.23 = set.fds_bits.23 | mask
			case 24: set.fds_bits.24 = set.fds_bits.24 | mask
			case 25: set.fds_bits.25 = set.fds_bits.25 | mask
			case 26: set.fds_bits.26 = set.fds_bits.26 | mask
			case 27: set.fds_bits.27 = set.fds_bits.27 | mask
			case 28: set.fds_bits.28 = set.fds_bits.28 | mask
			case 29: set.fds_bits.29 = set.fds_bits.29 | mask
			case 30: set.fds_bits.30 = set.fds_bits.30 | mask
			case 31: set.fds_bits.31 = set.fds_bits.31 | mask
			default: break
			}
		}
		
		
		/// Replacement for FD_CLR macro
		
		public static func CLR(fd: Int32, set: inout fd_set) {
			let intOffset = Int(fd / 32)
			let bitOffset = fd % 32
			let mask = ~(1 << bitOffset)
			switch intOffset {
			case 0: set.fds_bits.0 = set.fds_bits.0 & mask
			case 1: set.fds_bits.1 = set.fds_bits.1 & mask
			case 2: set.fds_bits.2 = set.fds_bits.2 & mask
			case 3: set.fds_bits.3 = set.fds_bits.3 & mask
			case 4: set.fds_bits.4 = set.fds_bits.4 & mask
			case 5: set.fds_bits.5 = set.fds_bits.5 & mask
			case 6: set.fds_bits.6 = set.fds_bits.6 & mask
			case 7: set.fds_bits.7 = set.fds_bits.7 & mask
			case 8: set.fds_bits.8 = set.fds_bits.8 & mask
			case 9: set.fds_bits.9 = set.fds_bits.9 & mask
			case 10: set.fds_bits.10 = set.fds_bits.10 & mask
			case 11: set.fds_bits.11 = set.fds_bits.11 & mask
			case 12: set.fds_bits.12 = set.fds_bits.12 & mask
			case 13: set.fds_bits.13 = set.fds_bits.13 & mask
			case 14: set.fds_bits.14 = set.fds_bits.14 & mask
			case 15: set.fds_bits.15 = set.fds_bits.15 & mask
			case 16: set.fds_bits.16 = set.fds_bits.16 & mask
			case 17: set.fds_bits.17 = set.fds_bits.17 & mask
			case 18: set.fds_bits.18 = set.fds_bits.18 & mask
			case 19: set.fds_bits.19 = set.fds_bits.19 & mask
			case 20: set.fds_bits.20 = set.fds_bits.20 & mask
			case 21: set.fds_bits.21 = set.fds_bits.21 & mask
			case 22: set.fds_bits.22 = set.fds_bits.22 & mask
			case 23: set.fds_bits.23 = set.fds_bits.23 & mask
			case 24: set.fds_bits.24 = set.fds_bits.24 & mask
			case 25: set.fds_bits.25 = set.fds_bits.25 & mask
			case 26: set.fds_bits.26 = set.fds_bits.26 & mask
			case 27: set.fds_bits.27 = set.fds_bits.27 & mask
			case 28: set.fds_bits.28 = set.fds_bits.28 & mask
			case 29: set.fds_bits.29 = set.fds_bits.29 & mask
			case 30: set.fds_bits.30 = set.fds_bits.30 & mask
			case 31: set.fds_bits.31 = set.fds_bits.31 & mask
			default: break
			}
		}
		
		
		/// Replacement for FD_ISSET macro
		
		public static func ISSET(fd: Int32, set: inout fd_set) -> Bool {
			let intOffset = Int(fd / 32)
			let bitOffset = fd % 32
			let mask = 1 << bitOffset
			switch intOffset {
			case 0: return set.fds_bits.0 & mask != 0
			case 1: return set.fds_bits.1 & mask != 0
			case 2: return set.fds_bits.2 & mask != 0
			case 3: return set.fds_bits.3 & mask != 0
			case 4: return set.fds_bits.4 & mask != 0
			case 5: return set.fds_bits.5 & mask != 0
			case 6: return set.fds_bits.6 & mask != 0
			case 7: return set.fds_bits.7 & mask != 0
			case 8: return set.fds_bits.8 & mask != 0
			case 9: return set.fds_bits.9 & mask != 0
			case 10: return set.fds_bits.10 & mask != 0
			case 11: return set.fds_bits.11 & mask != 0
			case 12: return set.fds_bits.12 & mask != 0
			case 13: return set.fds_bits.13 & mask != 0
			case 14: return set.fds_bits.14 & mask != 0
			case 15: return set.fds_bits.15 & mask != 0
			case 16: return set.fds_bits.16 & mask != 0
			case 17: return set.fds_bits.17 & mask != 0
			case 18: return set.fds_bits.18 & mask != 0
			case 19: return set.fds_bits.19 & mask != 0
			case 20: return set.fds_bits.20 & mask != 0
			case 21: return set.fds_bits.21 & mask != 0
			case 22: return set.fds_bits.22 & mask != 0
			case 23: return set.fds_bits.23 & mask != 0
			case 24: return set.fds_bits.24 & mask != 0
			case 25: return set.fds_bits.25 & mask != 0
			case 26: return set.fds_bits.26 & mask != 0
			case 27: return set.fds_bits.27 & mask != 0
			case 28: return set.fds_bits.28 & mask != 0
			case 29: return set.fds_bits.29 & mask != 0
			case 30: return set.fds_bits.30 & mask != 0
			case 31: return set.fds_bits.31 & mask != 0
			default: return false
			}
			
		}
	}
	
#endif