스위프트 - 바이트 배열에서 임의의 기본 문자열 만들기

이것은 기본 10에 대해 이미 작성 했으므로 2...36 의 모든 기본 버전은 다음과 같습니다. :

func bytesToRadix<C: RangeReplaceableCollection>(_ bytes: C, radix: Int, isUppercase: Bool = false, isBigEndian: Bool = true) -> String where C.Element == UInt8 {
    // Nothing to process or radix outside of 2...36, return an empty string.
    guard !bytes.isEmpty, 2...36 ~= radix else { return "" }
    let bytes = isBigEndian ? bytes : C(bytes.reversed())
    // For efficiency in calculation, combine 7 bytes into one Int.
    let chunk = 7
    let numvalues = bytes.count
    var ints = Array(repeating: 0, count: (numvalues + chunk - 1)/chunk)
    var rem = numvalues % chunk == 0 ? chunk : numvalues % chunk
    var index = 0
    var accum = 0
    for value in bytes {
        accum = (accum << 8) + Int(value)
        rem -= 1
        if rem == 0 {
            rem = chunk
            ints[index] = accum
            index += 1
            accum = 0
        }
    }
    // Array to hold the result, in reverse order
    var digits = [Int]()
    // Repeatedly divide value by radix, accumulating the remainders.
    // Repeat until original number is zero
    while !ints.isEmpty {
        var carry = 0
        for (index, value) in ints.enumerated() {
            var total = (carry << (8 * chunk)) + value
            carry = total % radix
            total /= radix
            ints[index] = total
        }
        digits.append(carry)
        // Remove leading Ints that have become zero.
        ints = .init(ints.drop { $0 == 0 })
    }
    // Create mapping of digit Int to String
    let letterOffset = Int(UnicodeScalar(isUppercase ? "A" : "a").value - 10)
    let letters = (0 ..< radix).map { d in d < 10 ? "\(d)" : String(UnicodeScalar(letterOffset + d)!) }
    // Reverse the digits array, convert them to String, and join them
    return digits.reversed().map { letters[$0] }.joined()
}

예 :

let face: [UInt8] = [0xFA, 0xCE]
print(bytesToRadix(face, radix: 16))  // "face"
print(bytesToRadix(face, radix: 16, isUppercase: true))  // "FACE"
print(bytesToRadix(face, radix: 16, isBigEndian: false))  // "cefa""
print(bytesToRadix(face, radix: 16, isUppercase: true, isBigEndian: false))  // "CEFA"
print(bytesToRadix(face, radix: 10)) // "64206"
print(bytesToRadix(face, radix: 2))  // "111101011001110"
print(bytesToRadix(face, radix: 36)) // "1dji"
// also works with Data
let faceData = Data([0xFA, 0xCE])
print(bytesToRadix(face, radix: 16))  // "face"

일부 사례 :

print(bytesToRadix([9], radix: 16))   // "9"
print(bytesToRadix([10], radix: 16))  // "a"
print(bytesToRadix([15], radix: 16))  // "f"
print(bytesToRadix([16], radix: 16))  // "10"
print(bytesToRadix([35], radix: 36))  // "z"
print(bytesToRadix([36], radix: 36))  // "10"

대형 테스트 :

let bArray = (0...255).map(UInt8.init)
print(bytesToRadix(bArray, radix: 16, isBigEndian: false))

와이즈 비즈

 
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

와이즈 비즈 <시간>

샘플 데이터로 테스트 :

print(bytesToRadix(bArray, radix: 36))

와이즈 비즈

 
168swoi6iuzj4fbwknlnh695zl88v65qcfgnwrwepqcxb9dysmluowqahvt3r9gsc1v47ssxdivjda3nttl6r044pzz7zwhtgu2mkow5ts28x2mbwenh3wfz4s1sarspfhlrakvqrgpmzb66sgtz2lzbotl7r28wcq8925c747b44l60vrk3scrin4zvnwn7pdsukgo6lgjhu1nuwj7yt1h9ujpe3os17onsk7sp4ysmytu568do2tqetwnrmbxb2dtd8kqorcoakaizlm9svr8axe1acxfursz11nubrhighfd64yhmp99ucvzr944n8co01o4x64cmbd8be0hqbm2zy5uwe4uplc4sa50xajel4bkkxb1kh21pisna37eqwpbpq11ypr

와이즈 비즈 <시간>

역 기능 : let bArray: [UInt8] = [169, 74, 143, 229, 204, 177, 155, 166, 28, 76, 8, 115, 211, 145, 233, 135, 152, 47, 187, 211] print(bytesToRadix(bArray, radix: 16))

여기서 역 기능의 빠른 버전이 있습니다. 아직 대문자를 사용하거나 엔디안을 처리 할 수 ​​없습니다 (빅 엔디안이 가정 됨).

 
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데이터 (바이트)에서 정수로 변환 한 다음 기본 36으로 변환하려고하는 것 같습니다 :

print(bytesToRadix(bArray, radix: 36))

<시간>

 
jrwjerxiekdtj9k82lg930wpkr6tq6r

radixToBytes