mirror of
https://github.com/HIllya51/LunaHook.git
synced 2024-12-30 23:14:12 +08:00
147 lines
6.4 KiB
C++
147 lines
6.4 KiB
C++
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#include"FocasLens.h"
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/** jichi 2/6/2015 FocasLens (Touhou)
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* Sample game: [141227] [FocasLens] 幻想人形演<EFBFBD>
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*
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* Debugging method:
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* 1. Find first matched text, which has stable address
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* 2. Insert WRITE hw break point
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* 3. Find where the text is assigned
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*
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* The game also invokes GDI functions (GetGlyphOutlineA), where the access is cached and looped.
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*
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* Issues:
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* - This hook cannot find name thread
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* - Selected character name is hard-coded to the thread
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*
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* 001faaed cc int3
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* 001faaee cc int3
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* 001faaef cc int3
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* 001faaf0 55 push ebp
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* 001faaf1 8bec mov ebp,esp
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* 001faaf3 51 push ecx
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* 001faaf4 53 push ebx
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* 001faaf5 56 push esi
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* 001faaf6 57 push edi
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* 001faaf7 8bf0 mov esi,eax
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* 001faaf9 e8 98281500 call .0034d396
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* 001faafe 50 push eax
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* 001faaff a1 b08bb100 mov eax,dword ptr ds:[0xb18bb0]
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* 001fab04 03c6 add eax,esi
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* 001fab06 50 push eax
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* 001fab07 e8 9b241500 call .0034cfa7
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* 001fab0c 8b0d e88bb100 mov ecx,dword ptr ds:[0xb18be8]
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* 001fab12 8b3d b08bb100 mov edi,dword ptr ds:[0xb18bb0]
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* 001fab18 83c1 f7 add ecx,-0x9
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* 001fab1b 83c4 08 add esp,0x8
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* 001fab1e 8bd8 mov ebx,eax
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* 001fab20 390d ec8bb100 cmp dword ptr ds:[0xb18bec],ecx
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* 001fab26 7c 65 jl short .001fab8d
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* 001fab28 803c37 20 cmp byte ptr ds:[edi+esi],0x20
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* 001fab2c 74 41 je short .001fab6f
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* 001fab2e 803c37 81 cmp byte ptr ds:[edi+esi],0x81
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* 001fab32 75 4d jnz short .001fab81
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* 001fab34 807c37 01 42 cmp byte ptr ds:[edi+esi+0x1],0x42
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* 001fab39 74 34 je short .001fab6f
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* 001fab3b 803c37 81 cmp byte ptr ds:[edi+esi],0x81
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* 001fab3f 75 40 jnz short .001fab81
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* 001fab41 807c37 01 41 cmp byte ptr ds:[edi+esi+0x1],0x41
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* 001fab46 74 27 je short .001fab6f
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* 001fab48 803c37 81 cmp byte ptr ds:[edi+esi],0x81
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* 001fab4c 75 33 jnz short .001fab81
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* 001fab4e 807c37 01 48 cmp byte ptr ds:[edi+esi+0x1],0x48
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* 001fab53 74 1a je short .001fab6f
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* 001fab55 803c37 81 cmp byte ptr ds:[edi+esi],0x81
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* 001fab59 75 26 jnz short .001fab81
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* 001fab5b 807c37 01 49 cmp byte ptr ds:[edi+esi+0x1],0x49
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* 001fab60 74 0d je short .001fab6f
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* 001fab62 803c37 81 cmp byte ptr ds:[edi+esi],0x81
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* 001fab66 75 19 jnz short .001fab81
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* 001fab68 807c37 01 40 cmp byte ptr ds:[edi+esi+0x1],0x40
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* 001fab6d 75 12 jnz short .001fab81
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* 001fab6f 803d c58bb100 00 cmp byte ptr ds:[0xb18bc5],0x0
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* 001fab76 75 09 jnz short .001fab81
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* 001fab78 c605 c58bb100 01 mov byte ptr ds:[0xb18bc5],0x1
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* 001fab7f eb 0c jmp short .001fab8d
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* 001fab81 e8 7a000000 call .001fac00
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* 001fab86 c605 c58bb100 00 mov byte ptr ds:[0xb18bc5],0x0
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* 001fab8d 8b0d e48bb100 mov ecx,dword ptr ds:[0xb18be4]
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* 001fab93 33c0 xor eax,eax
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* 001fab95 85db test ebx,ebx
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* 001fab97 7e 2b jle short .001fabc4
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* 001fab99 8d1437 lea edx,dword ptr ds:[edi+esi]
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* 001fab9c 8b35 ec8bb100 mov esi,dword ptr ds:[0xb18bec]
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* 001faba2 8955 fc mov dword ptr ss:[ebp-0x4],edx
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* 001faba5 8bd1 mov edx,ecx
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* 001faba7 0faf15 e88bb100 imul edx,dword ptr ds:[0xb18be8]
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* 001fabae 0315 bc8bb100 add edx,dword ptr ds:[0xb18bbc] ; .00b180f8
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* 001fabb4 03f2 add esi,edx
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* 001fabb6 8b55 fc mov edx,dword ptr ss:[ebp-0x4]
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* 001fabb9 8a1402 mov dl,byte ptr ds:[edx+eax]
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* 001fabbc 881406 mov byte ptr ds:[esi+eax],dl ; jichi: text is in dl in byte
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* 001fabbf 40 inc eax
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* 001fabc0 3bc3 cmp eax,ebx
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* 001fabc2 ^7c f2 jl short .001fabb6
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* 001fabc4 0faf0d e88bb100 imul ecx,dword ptr ds:[0xb18be8]
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* 001fabcb 030d bc8bb100 add ecx,dword ptr ds:[0xb18bbc] ; .00b180f8
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* 001fabd1 a1 ec8bb100 mov eax,dword ptr ds:[0xb18bec]
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* 001fabd6 03fb add edi,ebx
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* 001fabd8 893d b08bb100 mov dword ptr ds:[0xb18bb0],edi
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* 001fabde 5f pop edi
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* 001fabdf 03c8 add ecx,eax
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* 001fabe1 03c3 add eax,ebx
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* 001fabe3 5e pop esi
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* 001fabe4 c60419 00 mov byte ptr ds:[ecx+ebx],0x0
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* 001fabe8 a3 ec8bb100 mov dword ptr ds:[0xb18bec],eax
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* 001fabed 5b pop ebx
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* 001fabee 8be5 mov esp,ebp
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* 001fabf0 5d pop ebp
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* 001fabf1 c3 retn
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* 001fabf2 cc int3
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* 001fabf3 cc int3
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* 001fabf4 cc int3
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* 001fabf5 cc int3
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* 001fabf6 cc int3
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* 001fabf7 cc int3
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*/
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static void SpecialHookFocasLens(hook_stack* stack, HookParam *, uintptr_t *data, uintptr_t *split, size_t*len)
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{
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DWORD addr = (DWORD)stack->base + get_reg(regs::edx);
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if (*(char *)addr) {
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*data = addr;
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*len = 1;
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*split = FIXED_SPLIT_VALUE;
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}
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}
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bool InsertFocasLensHook()
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{
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const BYTE bytes[] = {
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0x8a,0x14,0x02, // 001fabb9 8a1402 mov dl,byte ptr ds:[edx+eax]
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0x88,0x14,0x06, // 001fabbc 881406 mov byte ptr ds:[esi+eax],dl ; jichi: text is in dl in byte
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0x40, // 001fabbf 40 inc eax
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0x3b,0xc3 // 001fabc0 3bc3 cmp eax,ebx
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};
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enum { addr_offset = 0x001fabbc - 0x001fabb9 };
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ULONG addr = MemDbg::findBytes(bytes, sizeof(bytes), processStartAddress, processStopAddress);
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//GROWL(addr);
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if (!addr) {
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ConsoleOutput("FocasLens: pattern not found");
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return false;
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}
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HookParam hp;
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hp.address = addr + addr_offset;
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hp.text_fun = SpecialHookFocasLens; // use special hook to force byte access
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hp.type = USING_STRING|USING_SPLIT|FIXING_SPLIT|NO_CONTEXT; // no context to get rid of relative function address
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ConsoleOutput("INSERT FocasLens");
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// GDI functions are kept in case the font is not cached
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//
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return NewHook(hp, "FocasLens");
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}
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bool FocasLens::attach_function() {
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return InsertFocasLensHook();
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}
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