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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftCrypto open source project
//
// Copyright (c) 2019-2020 Apple Inc. and the SwiftCrypto project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.md for the list of SwiftCrypto project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
import Foundation
enum ByteHexEncodingErrors: Error {
case incorrectHexValue
case incorrectString
}
let charA = UInt8(UnicodeScalar("a").value)
let char0 = UInt8(UnicodeScalar("0").value)
private func itoh(_ value: UInt8) -> UInt8 {
return (value > 9) ? (charA + value - 10) : (char0 + value)
}
private func htoi(_ value: UInt8) throws -> UInt8 {
switch value {
case char0...char0 + 9:
return value - char0
case charA...charA + 5:
return value - charA + 10
default:
throw ByteHexEncodingErrors.incorrectHexValue
}
}
extension Array where Element == UInt8 {
init(hexString: String) throws {
self.init()
guard hexString.count.isMultiple(of: 2), !hexString.isEmpty else {
throw ByteHexEncodingErrors.incorrectString
}
let stringBytes: [UInt8] = Array(hexString.data(using: String.Encoding.utf8)!)
for i in 0...((hexString.count / 2) - 1) {
let char1 = stringBytes[2 * i]
let char2 = stringBytes[2 * i + 1]
try self.append(htoi(char1) << 4 + htoi(char2))
}
}
}
extension DataProtocol {
var hexString: String {
get {
let hexLen = self.count * 2
return String.init(unsafeUninitializedCapacity: hexLen) { buf in
var offset = 0
self.regions.forEach { (_) in
for i in self {
buf[Int(offset * 2)] = itoh((i >> 4) & 0xF)
buf[Int(offset * 2 + 1)] = itoh(i & 0xF)
offset += 1
}
}
return offset
}
}
}
}
extension Data {
init(hexString: String) throws {
self.init()
if hexString.count == 0 {
return
}
if hexString.count % 2 != 0 {
throw ByteHexEncodingErrors.incorrectString
}
let stringBytes: [UInt8] = Array(hexString.data(using: String.Encoding.utf8)!)
for i in 0...((hexString.count / 2) - 1) {
let char1 = stringBytes[2 * i]
let char2 = stringBytes[2 * i + 1]
try self.append(htoi(char1) << 4 + htoi(char2))
}
}
}
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