qt，怎么解压缩一个.zip包

qt，如何解压缩一个.zip包
如题，qt是用哪个库函数来读取zip包，刚接触qt，望指点

http://www.qtcn.org/bbs/read.php?tid=15037&uid=72698

QProcess gzip;
gzip.start("gzip", QStringList() << "-c");
if (!gzip.waitForStarted())
return false;

gzip.write("Qt rocks!");
gzip.closeWriteChannel();

if (!gzip.waitForFinished())
return false;

QByteArray result = gzip.readAll();