An advanced Ethereum/EVM mobile wallet
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
alpha-wallet-ios/AlphaWallet/Extensions/Data.swift

95 lines
3.0 KiB

// Copyright SIX DAY LLC. All rights reserved.
import UIKit
import CoreImage
extension Data {
struct HexEncodingOptions: OptionSet {
let rawValue: Int
static let upperCase = HexEncodingOptions(rawValue: 1 << 0)
}
func hex(options: HexEncodingOptions = []) -> String {
let format = options.contains(.upperCase) ? "%02hhX" : "%02hhx"
return map { String(format: format, $0) }.joined()
}
var hexEncoded: String {
return "0x" + self.hex()
}
init(_hex value: String, chunkSize: Int) {
if value.count > chunkSize {
self = value.chunked(into: chunkSize).reduce(NSMutableData()) { result, chunk -> NSMutableData in
let part = Data(_hex: String(chunk))
result.append(part)
return result
} as Data
} else {
self = Data(_hex: value)
}
}
//NOTE: renamed to `_hex` because CryptoSwift has its own implementation of `.init(hex:)` that instantiates Data() object with additionaly byte at the end. That brokes `signing` in app. Not sure that this is good name.
init(_hex hex: String) {
let len = hex.count / 2
var data = Data(capacity: len)
for i in 0..<len {
let from = hex.index(hex.startIndex, offsetBy: i*2)
let to = hex.index(hex.startIndex, offsetBy: i*2 + 2)
let bytes = hex[from ..< to]
if var num = UInt8(bytes, radix: 16) {
data.append(&num, count: 1)
}
}
self = data
}
//TODO remove if unused. Also confusing
init?(fromHexEncodedString string: String) {
// Convert 0 ... 9, a ... f, A ...F to their decimal value,
// return nil for all other input characters
func decodeNibble(u: UInt16) -> UInt8? {
switch u {
case 0x30 ... 0x39:
return UInt8(u - 0x30)
case 0x41 ... 0x46:
return UInt8(u - 0x41 + 10)
case 0x61 ... 0x66:
return UInt8(u - 0x61 + 10)
default:
return nil
}
}
self.init(capacity: string.utf16.count/2)
var even = true
var byte: UInt8 = 0
for c in string.utf16 {
guard let val = decodeNibble(u: c) else { return nil }
if even {
byte = val << 4
} else {
byte += val
append(byte)
}
even = !even
}
guard even else { return nil }
}
func toString() -> String? {
return String(data: self, encoding: .utf8)
}
func toQRCode() -> UIImage? {
if let filter = CIFilter(name: "CIQRCodeGenerator") {
filter.setValue(self, forKey: "inputMessage")
let transform = CGAffineTransform(scaleX: 7, y: 7)
if let output = filter.outputImage?.transformed(by: transform) {
return UIImage(ciImage: output)
}
}
return nil
}
}