swift removePercentEncoding不适用于gb2312字符串 [英] swift removingPercentEncoding not work with a gb2312 string

问题描述

服务器返回已由urlencode函数处理的gb2312字符串：

The server returns a gb2312 string that has been processed by the urlencode function:

％D7％CF％BD％FB％B3 ％C7％C4％A7％D6％E4_％CE％DE％CF％DE％D0％A1％CB％B5％CD％F8_www.55x.cn.rar

%D7%CF%BD%FB%B3%C7%C4%A7%D6%E4_%CE%DE%CF%DE%D0%A1%CB%B5%CD%F8_www.55x.cn.rar

如何将其解码回gb2312字符串：

How to decode it back to gb2312 string:

紫禁城魔咒_无限小说网_www。 55x.cn.rar

紫禁城魔咒_无限小说网_www.55x.cn.rar

推荐答案

不考虑UTF-8以外的其他编码的百分比编码在最近的www世界中是一种推荐的方式，所以你可能需要自己实现这样的转换。

Percent encoding on other encodings than UTF-8 is not considered to be a recommended way in recent www world, so you may need to implement such conversion by yourself.

它可能是这样的：

extension String.Encoding {
    static let gb_18030_2000 = String.Encoding(rawValue: CFStringConvertEncodingToNSStringEncoding(CFStringEncoding(CFStringEncodings.GB_18030_2000.rawValue)))
}

extension String {
    func bytesByRemovingPercentEncoding(using encoding: String.Encoding) -> Data {
        struct My {
            static let regex = try! NSRegularExpression(pattern: "(%[0-9A-F]{2})|(.)", options: .caseInsensitive)
        }
        var bytes = Data()
        let nsSelf = self as NSString
        for match in My.regex.matches(in: self, range: NSRange(0..<self.utf16.count)) {
            if match.rangeAt(1).location != NSNotFound {
                let hexString = nsSelf.substring(with: NSMakeRange(match.rangeAt(1).location+1, 2))
                bytes.append(UInt8(hexString, radix: 16)!)
            } else {
                let singleChar = nsSelf.substring(with: match.rangeAt(2))
                bytes.append(singleChar.data(using: encoding) ?? "?".data(using: .ascii)!)
            }
        }
        return bytes
    }
    func removingPercentEncoding(using encoding: String.Encoding) -> String? {
        return String(data: bytesByRemovingPercentEncoding(using: encoding), encoding: encoding)
    }
}

let origStr = "%D7%CF%BD%FB%B3%C7%C4%A7%D6%E4_%CE%DE%CF%DE%D0%A1%CB%B5%CD%F8_www.55x.cn.rar"
print(origStr.removingPercentEncoding(using: .gb_18030_2000)) //->Optional("紫禁城魔咒_无限小说网_www.55x.cn.rar")

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