chat hook

#include "main.h"

DWORD Hook_ChatMessage_Addr;
bool message_permission, hooks_is_created;

void __stdcall ChangeString(char* str)
{
    if (message_permission)
    {
        message_permission = false;
        return;
    }
    if (strstr(str, "Warning:"))
    {
        std::string newstr = str;
        newstr.replace(newstr.find("Warning"), newstr.find(":"), "NedoWarning");
        strcpy_s(str, 256, newstr.c_str());
    }
    else if (strstr(str, "<Warning>"))
    {
        std::string newstr = str;
        newstr.replace(newstr.find("<Warning>"), newstr.find(" "), "NedoWarning:");
        strcpy_s(str, 256, newstr.c_str());
    }
}

void __declspec(naked) Hook_ChatMessage()
{
    __asm
    {
        add esp, 0x4
        pop esi
        add esp, 0x48
        pushad
        pushfd
        push esi
        call ChangeString
        popfd
        popad
        ret 0xC
    }
}


void create_jmp_hook(DWORD addr, DWORD dwJumpTo, size_t size)
{
    DWORD old_protect;
    VirtualProtect((LPVOID)addr, size, PAGE_EXECUTE_READWRITE, &old_protect);

    *reinterpret_cast<BYTE*>(addr) = 0xE9;
    *reinterpret_cast<DWORD*>(addr + 0x1) = dwJumpTo - addr - 0x5;

    for (DWORD i = 0x5; i < size; i++)
        *reinterpret_cast<BYTE*>(addr + i) = 0x90;

    VirtualProtect((LPVOID)addr, size, old_protect, &old_protect);
}

void init_hooks()
{
    Hook_ChatMessage_Addr = (DWORD)GetModuleHandleA("samp.dll") + 0x63C8A;

    create_jmp_hook(Hook_ChatMessage_Addr, (DWORD)Hook_ChatMessage, 7);

    hooks_is_created = true;
}