Header Magic
Version 1.03
Author: byuu
Release date: 2011-07-12


About:
The original Lunar Magic application requires a header to be appended before it can edit the files.
By using Header Magic, headerless ROMs can be opened and edited directly, without the need for a header to ever be appended.
Unlike simple batch scripts, Header Magic will not simply create hidden copies of the file.
It truly extends Lunar Magic to seamlessly support headerless ROMs.


Support:
Permission was granted by FuSoYa to make this application.
However, there is absolutely no support provided by FuSoYa for this application.
Please do not contact FuSoYa about Header Magic.


Download:
Lunar Magic does not allow its distribution in any form other than its own ZIP archive.
As such, wget and unzip have been included to automatically download lm182.zip and extract the program.
This will only happen once upon first launch of the application.
You are then free to remove wget.exe and unzip.exe, as they are no longer necessary.


Technical details:
Header Magic.exe is a launcher application. It will load in Lunar Magic.dll as a new debuggee process.
It will then overwrite the program entry point to perform a DLL injection for Header Magic.dll.
Once Header Magic.dll is loaded into the process, it will hook all file access functions from the process´ copy of kernel32.
The original entry point for Lunar Magic will then be restored, and the program will be allowed to run normally.
Command-line arguments are forwarded along, so drag-and-drop still works seamlessly.
When Lunar Magic attempts to work with SNES ROM images, Header Magic will intervene.
If it detects a headerless ROM, it will tell Lunar Magic that there is indeed a header, and adjust the ROM offsets to compensate.
If it detects a headered ROM, operation will be identical to the standard Lunar Magic.
The entire process is 100% seamless and transparent. Absolutely no modifications have been made to the Lunar Magic binary.
The Lunar Magic binary was simply renamed to a DLL so that it is not accidentally launched instead of Header Magic.


Extensibility:
Full source code can be obtained from http://byuu.org/programming/
Both previous and future versions of Lunar Magic should be fully compatible with Header Magic.
In fact, the technique is easily extensive to virtually any Windows application that does not support headerless ROMs.