(Objective-C) GZip Create / Extract .gz File

Demonstrates how to compress a file to create a .gz (GZip) file.

Note: The .gz file format is a compressed file format. It contains a single file. The .gz file format is not an archive format (i.e. it does not contain a collection of files/directories such as with the .zip, .rar, or .tar file formats). GZip is often combined with TAR to create a .tgz (or .tar.gz).

Note: It is possible for a .gz to contain more than one file, but this is very uncommon.

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#import <CkoGzip.h>
#import <NSString.h>

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

CkoGzip *gzip = [[CkoGzip alloc] init];

// File-to-file GZip:
// Compress "hamlet.xml" to create "hamlet.xml.gz"
BOOL success = [gzip CompressFile: @"hamlet.xml" destPath: @"hamlet.xml.gz"];
if (success != YES) {
    NSLog(@"%@",gzip.LastErrorText);
    return;
}

// File-to-file ungzip
// Decompress "hamlet.xml.gz" to create "hamletOut.xml"
success = [gzip UncompressFile: @"hamlet.xml.gz" destPath: @"hamletOut.xml"];
if (success != YES) {
    NSLog(@"%@",gzip.LastErrorText);
    return;
}

// File-to-string ungzip
// Decompress the contents of a .gz directly to a string variable:
// The 2nd argument indicates the charset of the character
// data after it is decompressed.
NSString *xmlStr = 0;
xmlStr = [gzip UncompressFileToString: @"hamlet.xml.gz" inCharset: @"utf-8"];
if (success != YES) {
    NSLog(@"%@",gzip.LastErrorText);
    return;
}

NSLog(@"%@",xmlStr);

// The Chilkat GZip API provides much more flexibility than shown
// here.  See the reference documentation at 
// http://www.chilkatsoft.com/refdoc for more information