Patching 68K Software – SimpleText

6 months ago

Request to modify SimpleText to open a smaller text window at startup.
Initial assumption of an easy fix by overwriting constants proved incorrect.
Requires Apple developer CD's code editor in ResEdit for disassembling code resources.
Challenges in patching include avoiding resizing for different window types (pictures, video, about box).
Solution involves injecting a routine to detect text windows and substitute size without disrupting existing jumps.
Technique includes jumping to appended code and returning, ensuring registers are correctly managed.
Additional patches needed for window resizing after document content is read.
Workaround for storing variables within the code itself due to lack of global variables.
Use of direct system calls and register management tricks for efficiency.
Issues with CodeWarrior's limitations and ResEdit's template corruption noted.
Final solution includes a resource for easy future window size redefinition.

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