faeaf9259e
I really tried to use "cvar_changed" as name, but it bothered me so much to look that weird I could not keep it.
79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
// vim: set ts=4 sw=4 tw=99 noet:
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//
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// AMX Mod X, based on AMX Mod by Aleksander Naszko ("OLO").
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// Copyright (C) The AMX Mod X Development Team.
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//
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// This software is licensed under the GNU General Public License, version 3 or higher.
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// Additional exceptions apply. For full license details, see LICENSE.txt or visit:
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// https://alliedmods.net/amxmodx-license
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#include "cvars.h"
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#include "amxmodx.h"
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#include <CDetour/detours.h>
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CDetour *Cvar_DirectSetDetour;
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DETOUR_DECL_STATIC2(Cvar_DirectSet, void, struct cvar_s*, var, const char*, value)
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{
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if (var && value)
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{
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if (strcmp(var->string, value) != 0)
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{
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if (executeForwards(FF_CvarChanged, reinterpret_cast<cell>(var), var->string, value, var->name) > 0)
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{
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return;
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}
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}
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}
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DETOUR_STATIC_CALL(Cvar_DirectSet)(var, value);
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}
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void CreateCvarHook(void)
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{
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// void PF_Cvar_DirectSet(struct cvar_s *var, const char *value) // = pfnCvar_DirectSet
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// {
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// Cvar_DirectSet(var, value); // <- We want to hook this.
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// }
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byte *baseAddress = (byte *)g_engfuncs.pfnCvar_DirectSet;
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uintptr_t *functionAddress = nullptr;
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#if defined(WIN32)
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// 55 push ebp
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// 8B EC mov ebp, esp
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// 8B 45 0C mov eax, [ebp+arg_4]
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// 8B 4D 08 mov ecx, [ebp+arg_0]
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// 50 push eax
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// 51 push ecx
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// E8 XX XX XX XX call Cvar_DirectSet
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const byte opcodeJump = 0xE8;
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#else
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// E9 XX XX XX XX jmp Cvar_DirectSet
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const byte opcodeJump = 0xE9;
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#endif
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const byte opcodeJumpSize = 5;
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const byte opcodeJumpByteSize = 1;
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const int maxBytesLimit = 20;
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for (size_t i = 0; i < maxBytesLimit; ++i, ++baseAddress)
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{
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if (*baseAddress == opcodeJump)
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{
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functionAddress = (uintptr_t *)(&baseAddress[opcodeJumpSize] + *(uintptr_t *)&baseAddress[opcodeJumpByteSize]);
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break;
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}
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}
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if (functionAddress)
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{
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CDetour *Cvar_DirectSetDetour = DETOUR_CREATE_STATIC_FIXED(Cvar_DirectSet, (void *)functionAddress);
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if (Cvar_DirectSetDetour)
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{
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Cvar_DirectSetDetour->EnableDetour();
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}
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}
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} |