20 lines
656 B
Swift
20 lines
656 B
Swift
// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.
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import Foundation
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extension String {
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public func dataFromHex() -> Data? {
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guard self.count > 0 && (self.count % 2) == 0 else { return nil }
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let chars = self.map { $0 }
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let bytes: [UInt8] = stride(from: 0, to: chars.count, by: 2)
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.map { index -> String in String(chars[index]) + String(chars[index + 1]) }
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.compactMap { (str: String) -> UInt8? in UInt8(str, radix: 16) }
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guard bytes.count > 0 else { return nil }
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guard (self.count / bytes.count) == 2 else { return nil }
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return Data(bytes)
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}
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}
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