Is your disk partitioned using the MBR, GPT, or a hybrid scheme? If it's GPT or hybrid, Apple's Disk Utility can resize an HFS partition, although I'm not sure offhand if it can do this for the currently-booted active partition. (You may need to reboot into the installer to do the job.) If Windows boots from the same disk, chances are your system uses either a straight MBR or a hybrid configuration. If it's hybrid, Disk Utility should be able to handle it; but if it's MBR, Disk Utility can't resize it. If the only problem with GNU Parted is an incorrect icon in Chameleon, then chances are that can be corrected. My hunch is that this would be caused by Parted setting an incorrect partition type code. You could use Linux fdisk, OS X fdisk, or various other utilities to change the code back of 0xAF (decimal 175).