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- //
- // ArrayExtension.swift
- // CryptoSwift
- //
- // Created by Marcin Krzyzanowski on 10/08/14.
- // Copyright (c) 2014 Marcin Krzyzanowski. All rights reserved.
- //
- extension Array {
- init(reserveCapacity: Int) {
- self = Array<Element>()
- self.reserveCapacity(reserveCapacity)
- }
- }
- extension Array {
- /** split in chunks with given chunk size */
- public func chunks(size chunksize: Int) -> Array<Array<Element>> {
- var words = Array<Array<Element>>()
- words.reserveCapacity(self.count / chunksize)
- for idx in stride(from: chunksize, through: self.count, by: chunksize) {
- words.append(Array(self[idx - chunksize ..< idx])) // slow for large table
- }
- let remainder = self.suffix(self.count % chunksize)
- if !remainder.isEmpty {
- words.append(Array(remainder))
- }
- return words
- }
- }
- extension Array where Element: Integer, Element.IntegerLiteralType == UInt8 {
-
- public init(hex: String) {
- self.init(reserveCapacity: hex.unicodeScalars.lazy.underestimatedCount)
- var buffer:UInt8?
- var skip = hex.hasPrefix("0x") ? 2 : 0
- for char in hex.unicodeScalars.lazy {
- guard skip == 0 else {
- skip -= 1
- continue
- }
- guard char.value >= 48 && char.value <= 102 else {
- self.removeAll()
- return
- }
- let v:UInt8
- let c:UInt8 = UInt8(char.value)
- switch c{
- case let c where c <= 57:
- v = c - 48
- case let c where c >= 65 && c <= 70:
- v = c - 55
- case let c where c >= 97:
- v = c - 87
- default:
- self.removeAll()
- return
- }
- if let b = buffer {
- self.append(b << 4 | v as! Element)
- buffer = nil
- } else {
- buffer = v
- }
- }
- if let b = buffer{
- self.append(b as! Element)
- }
- }
-
- }
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