34 lines
1.2 KiB
Swift
34 lines
1.2 KiB
Swift
import Foundation
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public enum BonjourEscapes {
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/// mDNS / DNS-SD commonly escapes bytes in instance names as `\DDD` (decimal-encoded),
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/// e.g. spaces are `\032`.
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public static func decode(_ input: String) -> String {
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var out = ""
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var i = input.startIndex
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while i < input.endIndex {
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if input[i] == "\\",
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let d0 = input.index(i, offsetBy: 1, limitedBy: input.index(before: input.endIndex)),
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let d1 = input.index(i, offsetBy: 2, limitedBy: input.index(before: input.endIndex)),
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let d2 = input.index(i, offsetBy: 3, limitedBy: input.index(before: input.endIndex)),
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input[d0].isNumber,
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input[d1].isNumber,
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input[d2].isNumber
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{
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let digits = String(input[d0...d2])
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if let value = Int(digits),
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let scalar = UnicodeScalar(value)
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{
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out.append(Character(scalar))
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i = input.index(i, offsetBy: 4)
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continue
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}
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}
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out.append(input[i])
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i = input.index(after: i)
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}
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return out
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}
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}
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