Nov 8, 2009 at 6:32 AM
Join Date: Jun 22, 2008
Location:
Posts: 251
Well, I found myself with a little bit of spare time on my hands, and I was itching to work with assembly, cause I hadn't in a few months, so I made this hack to ML+.
The best part of this hack is that you can implement it into a mod at any time, and it won't screw up any ML+'s that you already are using. Before I go on, though, I should say:
THIS FUNCTION HAS NO ERROR CHECKING. IF YOU GIVE IT A BAD INPUT, IT WILL PROBABLY CRASH CAVE STORY.
Now, thats not to say don't use it. As long as you pay attention to what you are doing, you will be fine. Now, here is how to use the hack:
Saying ML+0XXX will still add XXX to your max and current health. This means you don't have to change your existing ML+'s unless you were adding more than 1000 health at once. Note: before I hacked this function, there was an automatic limit to your max health of 232. I had to remove this limit to save space, and I don't know what effects that will have. You won't run into this unless you plan to give quote more than 232 health anyway.
Saying ML+1XXX will subtract XXX from your max and current health. But be wary: If you subtract enough health that your max OR your current health is zero or less than zero, Cave Story will crash. You should be able to get around this by adding a LI+9999 before subtracting health.
Saying ML+2XXX will set your current and max health to XXX.
And, some examples!
Event 400 adds 3 health
Event 401 subtracts 3 health
Event 402 sets your health to 3
For you assembly junkies, here is the fully commented code used in this hack:
Since I changed the function entry point, I also had to change the one call to the function to reflect that. (Interesting note: I was a single byte short of being able to fit this in without having to change the call location. I considered removing the push/pop of EBP in the original function, but decided not to since I had already changed the call location anyway)
And, of course, I have a pre-hacked executable that you can use without needing to know any assembly at all. If you want to add this to an in progress mod, you may need to change some other settings, but starting a mod from scratch using this executable will work with no additional changes. It will even work in normal Cave Story.
Link. Enjoy!
The best part of this hack is that you can implement it into a mod at any time, and it won't screw up any ML+'s that you already are using. Before I go on, though, I should say:
THIS FUNCTION HAS NO ERROR CHECKING. IF YOU GIVE IT A BAD INPUT, IT WILL PROBABLY CRASH CAVE STORY.
Now, thats not to say don't use it. As long as you pay attention to what you are doing, you will be fine. Now, here is how to use the hack:
Saying ML+0XXX will still add XXX to your max and current health. This means you don't have to change your existing ML+'s unless you were adding more than 1000 health at once. Note: before I hacked this function, there was an automatic limit to your max health of 232. I had to remove this limit to save space, and I don't know what effects that will have. You won't run into this unless you plan to give quote more than 232 health anyway.
Saying ML+1XXX will subtract XXX from your max and current health. But be wary: If you subtract enough health that your max OR your current health is zero or less than zero, Cave Story will crash. You should be able to get around this by adding a LI+9999 before subtracting health.
Saying ML+2XXX will set your current and max health to XXX.
And, some examples!
Code:
#0400
<PRI<SOU0022<CMU0016
<MSG<GIT1006Got a =Life Capsule=!<WAI0160<NOD<RMU<ML+0003
Max health increased by 3!<NOD<END
#0401
<PRI<SOU0022<CMU0016
<MSG<GIT1006Got a =Life Capsule=!<WAI0160<NOD<RMU<ML+1003
Max health decreased by 3!<NOD<END
#0402
<PRI<SOU0022<CMU0016
<MSG<GIT1006Got a =Life Capsule=!<WAI0160<NOD<RMU<ML+2003
Max health set to 3!<NOD<ENDEvent 400 adds 3 health
Event 401 subtracts 3 health
Event 402 sets your health to 3
For you assembly junkies, here is the fully commented code used in this hack:
Code:
00419CA6 PUSH EBP ; saves old stack base
00419CA7 MOV EBP,ESP ; new stack base at current stack top
00419CA9 MOVSX EAX,WORD PTR SS:[EBP+8] ; puts ML+ param into EAX
00419CAD CMP EAX,7D0 ; compare ML+ param with 2000
00419CB2 JLE SHORT Doukutsu.00419CCD ; jump to next test
00419CB4 SUB EAX,7D0 ; subtracts 2000 from ML+ param, leaving the new number
00419CB9 MOV WORD PTR DS:[49E6D0],AX ; low 2 bytes of new health put into max health
00419CBF MOV WORD PTR DS:[49E6CC],AX ; low 2 bytes of new health put into current health
00419CC5 MOV WORD PTR DS:[49E6D4],AX ; low 2 bytes of new health put into displayed health (yellow bar)
00419CCB JMP SHORT Doukutsu.00419D0E ; jump to function exit point
00419CCD CMP EAX,3E8 ; compares ML+ param with 1000
00419CD2 JLE SHORT Doukutsu.00419CF0 ; jump to next test
00419CD4 SUB EAX,3E8 ; subtract 1000 from ML+ leaving number to be removed
00419CD9 SUB WORD PTR DS:[49E6D0],AX ; subtract number from max health
00419CE0 SUB WORD PTR DS:[49E6CC],AX ; subtract number from current health
00419CE7 SUB WORD PTR DS:[49E6D4],AX ; subtract number from displayed health (yellow bar)
00419CEE JMP SHORT Doukutsu.00419D0E ; jump to function exit point
00419CF0 ADD WORD PTR DS:[49E6D0],AX ; add number to max health
00419CF7 ADD WORD PTR DS:[49E6CC],AX ; add number to current health
00419CFE ADD WORD PTR DS:[49E6D4],AX ; add number to displayed health (yellow bar)
00419D05 NOP
00419D06 NOP
00419D07 NOP
00419D08 NOP
00419D09 NOP
00419D0A NOP
00419D0B NOP
00419D0C NOP
00419D0D NOP
00419D0E POP EBP ; return stack pointer from previous function
00419D0F RETN ; return to callerSince I changed the function entry point, I also had to change the one call to the function to reflect that. (Interesting note: I was a single byte short of being able to fit this in without having to change the call location. I considered removing the push/pop of EBP in the original function, but decided not to since I had already changed the call location anyway)
Code:
00422730 CALL Doukutsu.00419CA6And, of course, I have a pre-hacked executable that you can use without needing to know any assembly at all. If you want to add this to an in progress mod, you may need to change some other settings, but starting a mod from scratch using this executable will work with no additional changes. It will even work in normal Cave Story.
Link. Enjoy!
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