Read log file from bz2 file in objective-c

Question

I would like to read the contents of a logfile that has been rotated to a bz2 file. How can I do this while using as little memory as possible?

Answer 1

I just figured it out using these scripts: http://www.cocoadev.com/index.pl?BzipValueTransformer & http://www.cocoadev.com/index.pl?NSDataPlusBzip

What you need to do is include the libbz2.a which I found in /opt/local/lib/libbz2.a since I installed bzip2 using macports. I draged the file into my project and wrote the code:

- (void)bunzip
{
    NSString *path = @"/var/log/kernel.log.1.bz2";

    NSData *data = [NSData dataWithContentsOfFile:path];

    NSString *dataString = [[Bzip2ValueTransformer alloc] transformedValue:data];

    NSLog(@"Data: %@", dataString);
}

Result:

Dec 16 23:26:58 Paul-Peelens-MacBook-Pro kernel[0]: wlEvent: en1 en1 Link UP
Dec 16 23:26:58 Paul-Peelens-MacBook-Pro kernel[0]: AirPort: Link Up on en1
Dec 16 23:26:58 Paul-Peelens-MacBook-Pro kernel[0]: en1: BSSID changed to 32:7b:98:82:9d:7f
Dec 16 23:30:10 paul-peelens-macbook-pro newsyslog[13862]: logfile turned over due to size>1000K