Convert gz to zip format

Question

Is possible do convert GZ to ZIP format use objective-c?

NSFileManager *fileManger = [NSFileManager defaultManager];
NSError *error;

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [paths objectAtIndex:0];
paths = nil;
path = [path stringByAppendingPathComponent:@"text.zip"];

if([fileManger fileExistsAtPath:path ] == NO){
NSString *testPath = [[NSBundle mainBundle] pathForResource:@"text" ofType:@"gz"];
[fileManger copyItemAtPath:@"" toPath:@"" error:&error]; 
}

converted gz file from mainBundle to zip file placed to docuemtn directory.

But can not open zip file by ZipArchive class.

*What* is compressed within the `.gz` file? Is it `tar`? – trojanfoe Nov 13 '14 at 10:37 — trojanfoe, Nov 13 '14 at 10:37

score 2 · Accepted Answer · edited May 23 '17 at 10:33

2

gzip is only compressing data, while ZIP is both a compressor and archiver. A gzip stream can only compress one file while ZIP can compress several. So simply renaming the file cannot work.

You need to decompress the gzip stream to a file, then recompress as ZIP.

edited May 23 '17 at 10:33

Community

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answered Nov 13 '14 at 10:35

DarkDust

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Often `.gz` is used with `tar`, so there is that. However the solution is to unpack into a temporary directory and re-pack that directory using `zip`. – trojanfoe Nov 13 '14 at 10:37
@trojanfoe: Right. But you'd either need to know/expect the file to be a `tar.gz/tgz` file or check by inspecting the decompressed file before you can [untar the file](http://stackoverflow.com/questions/1811608/untar-file-on-iphone) . – DarkDust Nov 13 '14 at 10:50

Convert gz to zip format

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