This original UPS patcher is called Tsukuyomi UPS. UPS is completely future proof in that regard. But thanks to a condensed pointer encoding method, the file size can be infinite. The spec for UPS supports any file size, though the binary is currently limited to 4GB files due to libc limitations. The difficulty of implementing it is equal to IPS (it has trickier pointers, but no RLE magic). It is designed to be a direct replacement for IPS and to resolve all the problems that can occur with IPS, mainly it adds the so called checksum validation of the original file, which is being patched and therefore prevents any false patching and bugged roms (due to false patching).
The USP patching format is different from NINJA/xdelta/etc.
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