Developer Mode: Difference between revisions

You may want to read this if your Windows version of Oni is not covered by the above DLL (e.g. if you have an odd language version) or if you are on a Mac that cannot run the Intel build (if you're using an old PowerPC Mac, note that a Dev Mode-enabled version of The Omni Group's "Mac OS X port" is [[OMNI|HERE]]).

First, get a good hex editor. Ideally, it should allow you to search for sequences containing joker characters (that is, wildcards or bit masks). One such editor for Windows is [http://www.chmaas.handshake.de/delphi/freeware/xvi32/xvi32.htm XVI32]. On Macs, [http://www.cihexviewer.com/ CI Hex Viewer] is free, powerful, and can perform the search you need, but [http://ridiculousfish.com/hexfiend/ Hex Fiend] has a better comparison function so you can check your work afterward (open the original and edited binaries and choose File > Compare "Oni" and "Oni").

:When you type characters in the Pause screen, the text you enter is progressively compared with all the strings in the cheat table.

:When and if there is a match, the corresponding confirmation message is displayed for enablement/confirmation, or for disablement if the cheat was already on, and the corresponding cheat event takes effect when the Pause screen is closed.

:In the Windows retail/demo builds and The Omni Group's PPC Mac builds, every row of the lookup table takes up 16 bytes. The 3 pointers and the ID are 4-byte data words (little-endian in Windows, big-endian on PPC Macs). If a cheat has no "disabled" message, the row's third pointer is null.

:In Bungie's original Mac build (the retail version of the application), the pointers and the ID are 2-byte words (Big Endian). Regular rows take up 8 bytes, but for one-way cheats with no "disabled" message, weird stuff happens to the third pointer and to the ID, and the row takes up 10 bytes; here, the ID can be found in what would be the first byte of the ID field instead of the second, and the remaining 3 bytes are garbage. An additional garbage byte is added between consecutive one-way cheats (0x06 and 0x07).

====Let's kill "killmequick"====

In the Windows retail, Windows demo and Omni Group PPC builds, there's extra space at the end of the lookup table and where the cheat codes/messages are stored, so one can add '''thedayismine''' as an extra cheat. In Bungie's retail Mac builds, the data is packed tighter (and the text strings are stored together with their size), so the only easy way is to replace an existing cheat. Since replacing an existing cheat is the only solution that works on all platforms, the following mini-tutorial will explain how to bind the Developer Mode cheat event to the Ultra Mode cheat code '''killmequick''' (since hardly anyone uses that cheat).

Open the executable (or the data fork of the retail Mac build), after backing it up of course…. We shall look for the last three elements of the table, corresponding to '''fistsoflegend''', '''killmequick''' and '''carousel'''.

;In the Omni Group build, look for '''00 00 00 13 ## ## ## ## ## ## ## ## ## ## ## ## 00 00 00 14 ## ## ## ## ## ## ## ## ## ## ## ## 00 00 00 15''' ([[:File:Finding killmequick - Omni build.jpg|sample pic]])

;In the retail Mac build, look for '''00 13 ## ## ## ## ## ## 00 14 ## ## ## ## ## ## 00 15''' ([[:File:Finding killmequick - Mac OS 9 build.jpg|sample pic]])