CODEWITHSUNDEEP
iosswiftstringdecoding
Daniil Sencov
Daniil Sencov

Reputation: 36

Swift, decoding "iso-8859-5"

I receive a line in the format "iso-8859-5", but I can not decode it correctly. I think the problem is that I'm not converting the string correctly to data. But I do not know how to correctly convert a string to a data, without using a encoding.

Please help.

let string = "\\X2\\041F043504400435043A0440044B044204380435\\X0\\:\\X2\\042D\\X0\\_\\X2\\041F043B043804420430\\X0\\"
let encodingName = "iso-8859-5"

let cfe = CFStringConvertIANACharSetNameToEncoding(encodingName as CFString!)
if cfe != kCFStringEncodingInvalidId {
    let encoding = CFStringConvertEncodingToNSStringEncoding(cfe)
    let decString: String = NSString(data: string.data(using: String.Encoding.utf8)!, encoding: String.Encoding(rawValue: UInt(encoding)).rawValue)! as String  
    print("string: " + decString)
}

Upvotes: 1

Views: 903

Answers (2)

Gereon
Gereon

Reputation: 17844

Your encoded string consists of sequences 16-bit Unicode values (the hex digits between the \X2\ and \X0 separators). When you extract the values from that, you'll get this:

let bytes = [ 0x041F, 0x0435, 0x0440, 0x0435, 0x043A, 0x0440, 0x044B, 0x0442, 0x0438, 0x0435 ]

which you can convert to a String using this:

var s = ""
s.unicodeScalars.append(contentsOf: bytes.flatMap { UnicodeScalar($0) } )
print(s) // prints "Перекрытие"

Upvotes: 1

rob mayoff
rob mayoff

Reputation: 385500

You can't stick arbitrary bytes into a string literal in Swift. You need to store it as a array of UInt8 or as a Data. Example:

let bytes: [UInt8] = [0x41, 0xF0, 0x43, 0x50, 0x44, 0x43, 0x50, 0x43, 0xA0, 0x44]
let data = Data(bytes)
let cfEncoding = CFStringConvertIANACharSetNameToEncoding("iso-8859-5" as CFString)
let nsEncoding = CFStringConvertEncodingToNSStringEncoding(cfEncoding)
let string = NSString(data: data, encoding: nsEncoding) as String

Upvotes: 1

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