@Override
	public long truncateOffset(long offset) {
		if ((offset >= minOffset && offset <= maxOffset) || spaceSize == 0) {
			return offset;
		}
		if (signed) {
			offset = (offset + maxOffset + 1) % spaceSize;
			if (offset < 0) {
				offset += spaceSize;
			}
			return offset - maxOffset - 1;
		}
		// TODO: this could be a problem for large signed offset values within an unsigned space
		offset = offset % spaceSize;
		if (offset < 0) {
			offset += spaceSize;
		}
		return offset;
	}
No overlay translation necessary, this is a base addressSpace.

 (non-Javadoc)
@see ghidra.program.model.address.AddressSpace#getOverlayAddress(ghidra.program.model.address.Address)
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/address/AbstractAddressSpace.java