[U-Boot-Users] uImage wrapper removal?

Does anyone know if there's a utility to remove the U-Boot wrapper from a uImage (gzipped kernel, etc)? I'm creating a single uImage with kernel and ramdisk and I need to extract the kernel, replace the ramdisk and put it all back together after my Linux kernel has booted. I believe objcopy will allow me to extract the kernel from kernel/ramdisk ELF image but that's off-topic.

Just checking to see if there's something already out there of if this has been discussed before.

Thanks,

Tom