Swift String decoding, how to decode 8859 ( latin 1 ) string?

Question

Here is the data source, encoded by ISO-8859-1:

"x%DAe%91%C1%92%9B0%0C%86%9F%A5%3A%B3%C1%84%98%89%B9%F4%D0%F3%3EA%E9xd%5B%807%06S%23%B2%DD%EE%EC%BB%D7%24%E9%B4%9D%1E%3CcI%BF%A5O%BF%DF%21D%7B%D1%AF%23%21C%0BP%00%C7e%D5%26Et%16W%A6%04%ED%D7w%D8%BC%CB%D5s%D3%08%21T%16%AD6%26%82V%3Cn%BA%8Fi%DA%1B%EC%09%E2%DB%2B%A5%0A%C0e%E9%D1f%21%8C%CCK%DB%95%5D9%FA%80O%D5%E15%A2wq%1E%F6s%B0sW6%95%11%A7%DE%08el%D5%98S%D3H%A4%B3%B4u%AD%B0%E9%E5%09%0F%2F%CB%F0%D9O8%D0s%1C%D2%B1%2B%BFo%18%3C%BFue%25%C4%A7%AE%5C%FDOz%0A%7E%F2%DC%95gq%C9%99%1D%93%7E%40%5B%15%FB%8E%C8%3E%CE%19%E4%CB%E8g%CC%A5%D9%DB%CB%8C%D3%CE%26%A5%CC%89%40W%0A%D0%1E%B3%BC%0F8%40%3Bo%21%14%90b+%CDo%0B%DD%1A%E1%E6%7C%7C%DE%98%DC-%BCzG%BF%C3%BCz%22%0C%EC%27%FA%23%C0%8D%C7%982%E6%A3E%16e%A7%9D%1E%E3%1C%93%DEM%CD%F4b%9F%19%FC%95VF%BE%8B%B6%95%92%FE%D7Z%10%19r%B9%E8%87%F5w%BA5%26%BE3%27%1BW%D6%8F%25%B2%F5%7F%87%C7%EA%E3%5B%01%93%93%FA%FF%CF%05%7B%A6Z%2A%EC%8DR%27ekS%F7R%D6X%2BS%29stX%C1%C7%2F%7B%CD%B12"

I guess in swift, ISO-8859-1 is String.Encoding.isoLatin1

The content contained is

{"lock_wheat":"","topsSth":[{"uid":"8660009","score":0,"score_format":0,"setter":99,"appface":"http:hahaha","sex":1,"location":"China","nickname":"555","level":21,"flag":null,"role_type":1,"audioMuted":1,"videoMuted":0,"realtimeMuted":1,"authority_type":0,"head_honor_id":100021,"livestate":0,"user_score_format":"0","pk_score":null,"sort":21,"rcost_level":9,"cost_level":21}],"md5_tops_broadcaster":"666"}

PS: I edited some words above

---

I need to convert to the following Java code to Swift

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.zip.Inflater;


public class HelloWorld {
    public static String decompress(String data, String charset) throws UnsupportedEncodingException {
        byte[] bytes = data.getBytes(charset);
        byte[] output = new byte[0];

        Inflater decompresser = new Inflater();
        decompresser.reset();
        decompresser.setInput(bytes);

        ByteArrayOutputStream o = new ByteArrayOutputStream(bytes.length);
        try {
            byte[] buf = new byte[1024];
            while (!decompresser.finished()) {
                int i = decompresser.inflate(buf);
                o.write(buf, 0, i);
            }
            output = o.toByteArray();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                o.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        decompresser.end();
        return new String(output);
    }



    public static String decompress(String data) throws UnsupportedEncodingException {
        String decodeTmp = URLDecoder.decode(data, "ISO-8859-1");
        System.out.println(decodeTmp);
        return decompress(decodeTmp, "ISO-8859-1");
    }



    public static void main(String[] args) {
    
        String data = "x%DAe%91%C1%92%9B0%0C%86%9F%A5%3A%B3%C1%84%98%89%B9%F4%D0%F3%3EA%E9xd%5B%807%06S%23%B2%DD%EE%EC%BB%D7%24%E9%B4%9D%1E%3CcI%BF%A5O%BF%DF%21D%7B%D1%AF%23%21C%0BP%00%C7e%D5%26Et%16W%A6%04%ED%D7w%D8%BC%CB%D5s%D3%08%21T%16%AD6%26%82V%3Cn%BA%8Fi%DA%1B%EC%09%E2%DB%2B%A5%0A%C0e%E9%D1f%21%8C%CCK%DB%95%5D9%FA%80O%D5%E15%A2wq%1E%F6s%B0sW6%95%11%A7%DE%08el%D5%98S%D3H%A4%B3%B4u%AD%B0%E9%E5%09%0F%2F%CB%F0%D9O8%D0s%1C%D2%B1%2B%BFo%18%3C%BFue%25%C4%A7%AE%5C%FDOz%0A%7E%F2%DC%95gq%C9%99%1D%93%7E%40%5B%15%FB%8E%C8%3E%CE%19%E4%CB%E8g%CC%A5%D9%DB%CB%8C%D3%CE%26%A5%CC%89%40W%0A%D0%1E%B3%BC%0F8%40%3Bo%21%14%90b+%CDo%0B%DD%1A%E1%E6%7C%7C%DE%98%DC-%BCzG%BF%C3%BCz%22%0C%EC%27%FA%23%C0%8D%C7%982%E6%A3E%16e%A7%9D%1E%E3%1C%93%DEM%CD%F4b%9F%19%FC%95VF%BE%8B%B6%95%92%FE%D7Z%10%19r%B9%E8%87%F5w%BA5%26%BE3%27%1BW%D6%8F%25%B2%F5%7F%87%C7%EA%E3%5B%01%93%93%FA%FF%CF%05%7B%A6Z%2A%EC%8DR%27ekS%F7R%D6X%2BS%29stX%C1%C7%2F%7B%CD%B12";
         try {
             String dateNew = decompress(data);
             System.out.println(dateNew);
          } catch (Exception e) {
                e.printStackTrace();
          }
    }
}

Here is what I tried:

I am obstructed at this java line

String decodeTmp = URLDecoder.decode(data, "ISO-8859-1");

Here prints

xÚeÁ0 ¥:³Á¹ôÐó>Aéxd[7S#²Ýîì»×$é´<cI¿¥O¿ß!D{ѯ#!C PÇeÕ&EtW¦í×wؼËÕs!T­6&V<nºiÚì âÛ+¥ ÀeéÑf!ÌKÛ]9úOÕá5¢wqös°sW6§elÕSÓH¤³´u­°éå /ËðÙO8ÐsÒ±+¿o<¿ue%ħ®\ýOz ~òÜgqÉ~@[ûÈ>ÎäËègÌ¥ÙÛËÓÎ&¥Ì@W г¼8@;o!b Ío Ýáæ||ÞÜ-¼zG¿Ã¼z" ì'ú#ÀÇ2æ£Ee§ãÞMÍôbüVF¾¶þ×Zr¹èõwº5&¾3'Ö%²õÇêã[úÿÏ{¦Z*ìR'ekS÷R

as for URLDecoder in Java, I don't know such thing in Swift.

Answer 1

Here is Objective - C solution:

as @Martin R said, zlib

as @Sulthan said, deprecated since iOS 9

#include <zlib.h>

@implementation NSData (Compression)

#pragma mark -
#pragma mark Zlib Compression routines
- (NSData *) zlibInflate
{
    if ([self length] == 0) return self;
    
    unsigned full_length = [self length];
    unsigned half_length = [self length] / 2;
    
    NSMutableData *decompressed = [NSMutableData dataWithLength: full_length + half_length];
    BOOL done = NO;
    int status;
    
    z_stream strm;
    strm.next_in = (Bytef *)[self bytes];
    strm.avail_in = [self length];
    strm.total_out = 0;
    strm.zalloc = Z_NULL;
    strm.zfree = Z_NULL;
    
    if (inflateInit (&strm) != Z_OK) return nil;
    
    while (!done)
    {
        // Make sure we have enough room and reset the lengths.
        if (strm.total_out >= [decompressed length])
            [decompressed increaseLengthBy: half_length];
        strm.next_out = [decompressed mutableBytes] + strm.total_out;
        strm.avail_out = [decompressed length] - strm.total_out;
        
        // Inflate another chunk.
        status = inflate (&strm, Z_SYNC_FLUSH);
        if (status == Z_STREAM_END) done = YES;
        else if (status != Z_OK) break;
    }
    if (inflateEnd (&strm) != Z_OK) return nil;
    
    // Set real length.
    if (done)
    {
        [decompressed setLength: strm.total_out];
        return [NSData dataWithData: decompressed];
    }
    else return nil;
}


@end





@implementation NSString (ZlibData)

- (NSDictionary *)transformZLibData{
    NSString *str = [self stringByReplacingOccurrencesOfString:@"+" withString:@"%20"];
    
    NSString *latin1String = [str stringByReplacingPercentEscapesUsingEncoding:NSISOLatin1StringEncoding];
    
    NSData *latin1Data = [latin1String dataUsingEncoding:NSISOLatin1StringEncoding];
    
    NSData *inflateData = [latin1Data zlibInflate];
    
    if (![inflateData isKindOfClass:[NSData class]] || inflateData.length < 1) {
        return nil;
    }
    id jsonObj = [NSJSONSerialization JSONObjectWithData:inflateData options:NSJSONReadingAllowFragments error:nil];
    NSLog(@"%@", jsonObj);
    
    if (![jsonObj isKindOfClass:[NSDictionary class]]) {
        return nil;
    }
    return [NSDictionary dictionaryWithDictionary:(NSDictionary *)jsonObj];
}

@end

call like this:

let data = "x%DAe%91%C1%92%9B0%0C%86%9F%A5%3A%B3%C1%84%98%89%B9%F4%D0%F3%3EA%E9xd%5B%807%06S%23%B2%DD%EE%EC%BB%D7%24%E9%B4%9D%1E%3CcI%BF%A5O%BF%DF%21D%7B%D1%AF%23%21C%0BP%00%C7e%D5%26Et%16W%A6%04%ED%D7w%D8%BC%CB%D5s%D3%08%21T%16%AD6%26%82V%3Cn%BA%8Fi%DA%1B%EC%09%E2%DB%2B%A5%0A%C0e%E9%D1f%21%8C%CCK%DB%95%5D9%FA%80O%D5%E15%A2wq%1E%F6s%B0sW6%95%11%A7%DE%08el%D5%98S%D3H%A4%B3%B4u%AD%B0%E9%E5%09%0F%2F%CB%F0%D9O8%D0s%1C%D2%B1%2B%BFo%18%3C%BFue%25%C4%A7%AE%5C%FDOz%0A%7E%F2%DC%95gq%C9%99%1D%93%7E%40%5B%15%FB%8E%C8%3E%CE%19%E4%CB%E8g%CC%A5%D9%DB%CB%8C%D3%CE%26%A5%CC%89%40W%0A%D0%1E%B3%BC%0F8%40%3Bo%21%14%90b+%CDo%0B%DD%1A%E1%E6%7C%7C%DE%98%DC-%BCzG%BF%C3%BCz%22%0C%EC%27%FA%23%C0%8D%C7%982%E6%A3E%16e%A7%9D%1E%E3%1C%93%DEM%CD%F4b%9F%19%FC%95VF%BE%8B%B6%95%92%FE%D7Z%10%19r%B9%E8%87%F5w%BA5%26%BE3%27%1BW%D6%8F%25%B2%F5%7F%87%C7%EA%E3%5B%01%93%93%FA%FF%CF%05%7B%A6Z%2A%EC%8DR%27ekS%F7R%D6X%2BS%29stX%C1%C7%2F%7B%CD%B12"
        
if let dict = data.transformZLibData() as? [String:Any] { }