Martin Michelsen
44 lines
1.5 KiB
ArmAsm
44 lines
1.5 KiB
ArmAsm
# Original patch by Soly, in Blue Burst Patch Project
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# https://github.com/Solybum/Blue-Burst-Patch-Project
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.meta name="No rare selling"
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.meta description="Stops you from accidentally\nselling rares to vendors"
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entry_ptr:
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reloc0:
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.offsetof start
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start:
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# This works by setting the item price to zero if it's rare, which causes
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# the game to prevent you from selling the item. For armors and weapons, this
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# is easy because there are easily-patchable opcodes within branches that
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# return a constant price for rare items.
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xor eax, eax
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mov [0x005D25AF], eax # Rare armors
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mov [0x005D26F1], eax # Unidentified weapons
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mov [0x005D2706], eax # Rare weapons
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# For tools, it's harder to implement this, because the price comes from the
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# ItemPMT tools table and there is no branch for rares. Still, we can add a
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# branch to a stub to handle tools.
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pop ecx
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push 5
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push 0x005D2528
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call get_code_size
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.deltaof patch_code, patch_code_end
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get_code_size:
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pop eax
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push dword [eax]
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call patch_code_end
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patch_code:
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# TODO: It'd be nice to have something like WriteJumpToAndFromCode, since
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# this hook is supposed to return to a different place than where it was
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# called, hence this mov [esp].
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mov dword [esp], 0x005D2576
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xor edi, edi
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test byte [eax + 0x14], 0x80 # flags & 0x80 = is rare
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cmovz edi, [eax + 0x10] # Use price from table if not rare
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ret
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patch_code_end:
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push ecx
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.include WriteCallToCode-59NL
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