Swift Extensions for Data, Int, UInt8, UInt16, and UInt32 types

DataExtensions.swift

// MIT License

// Copyright (c) 2018 Boris Polania

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

//
//  DataExtensions.swift
//
//  Created by Boris Polania on 2/16/18.
//

import UIKit

extension Data {
    
    var uint8: UInt8 {
        get {
            var number: UInt8 = 0
            self.copyBytes(to:&number, count: MemoryLayout<UInt8>.size)
            return number
        }
    }
    
    var uint16: UInt16 {
        get {
            let i16array = self.withUnsafeBytes { $0.load(as: UInt16.self) }
            return i16array
        }
    }
    
    var uint32: UInt32 {
        get {
            let i32array = self.withUnsafeBytes { $0.load(as: UInt32.self) }
            return i32array
        }
    }
    
    var uuid: NSUUID? {
        get {
            var bytes = [UInt8](repeating: 0, count: self.count)
            self.copyBytes(to:&bytes, count: self.count * MemoryLayout<UInt32>.size)
            return NSUUID(uuidBytes: bytes)
        }
    }
    var stringASCII: String? {
        get {
            return NSString(data: self, encoding: String.Encoding.ascii.rawValue) as String?
        }
    }
    
    var stringUTF8: String? {
        get {
            return NSString(data: self, encoding: String.Encoding.utf8.rawValue) as String?
        }
    }

    struct HexEncodingOptions: OptionSet {
        let rawValue: Int
        static let upperCase = HexEncodingOptions(rawValue: 1 << 0)
    }
    
    func hexEncodedString(options: HexEncodingOptions = []) -> String {
        let format = options.contains(.upperCase) ? "%02hhX" : "%02hhx"
        return map { String(format: format, $0) }.joined()
    }
    
}

IntsExtension.swift

// MIT License

// Copyright (c) 2018 Boris Polania

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
//  DataExtensions.swift
//
//  Created by Boris Polania on 2/16/18.
//
//
//  IntsExtensions.swift
//
//  Created by Boris Polania on 2/19/18.
//

import UIKit

extension Int {
    var data: Data {
        var int = self
        return Data(bytes: &int, count: MemoryLayout<Int>.size)
    }
}

extension UInt8 {
    var data: Data {
        var int = self
        return Data(bytes: &int, count: MemoryLayout<UInt8>.size)
    }
}

extension UInt16 {
    var data: Data {
        var int = self
        return Data(bytes: &int, count: MemoryLayout<UInt16>.size)
    }
}

extension UInt32 {
    var data: Data {
        var int = self
        return Data(bytes: &int, count: MemoryLayout<UInt32>.size)
    }
    
    var byteArrayLittleEndian: [UInt8] {
        return [
            UInt8((self & 0xFF000000) >> 24),
            UInt8((self & 0x00FF0000) >> 16),
            UInt8((self & 0x0000FF00) >> 8),
            UInt8(self & 0x000000FF)
        ]
    }
}

Hi Boris.
This code is very helpful. However it gives an error in Swift5.

'withUnsafeBytes' is deprecated: use withUnsafeBytes<R>(_: (UnsafeRawBufferPointer) throws -> R) rethrows -> R instead

in the function var uint16: UInt16 {
get {
let i16array = self.withUnsafeBytes {
UnsafeBufferPointer(start: $0, count: self.count/2).map(UInt16.init(littleEndian:))
}
return i16array[0]
}
}

I appreciate very much your effort to hide away this ugly construct to give the programmer a natural view of Data.

John Brohan

Hello John! Yes, I did a while ago, I even forgot about it. I will update it for Swift 5 Cheers, B.

…

On Mon, Nov 25, 2019 at 5:46 AM John Brohan ***@***.***> wrote: Hi Boris. This code is very helpful. However it gives an error in Swift5. 'withUnsafeBytes' is deprecated: use withUnsafeBytes<R>(_: (UnsafeRawBufferPointer) throws -> R) rethrows -> R instead in the function var uint16: UInt16 { get { let i16array = self.withUnsafeBytes { UnsafeBufferPointer(start: $0, count: self.count/2).map(UInt16.init(littleEndian:)) } return i16array[0] } } I appreciate very much your effort to hide away this ugly construct to give the programmer a natural view of Data. John Brohan — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <https://gist.github.com/704901156020944d3e20fef515e73d61?email_source=notifications&email_token=AAG3M7TPUHNHFGWBPX43MWLQVPJMLA5CNFSM4JRJFEUKYY3PNVWWK3TUL52HS4DFVNDWS43UINXW23LFNZ2KUY3PNVWWK3TUL5UWJTQAF4YCS#gistcomment-3092521>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAG3M7SADEXH6OP3JDHHZ3LQVPJMLANCNFSM4JRJFEUA> .

Did this get updated for swift 5.5? It still has withUsafeBytes which is deprecated