sf_asi.cpp

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#include "sf_asi.h"
 
namespace ASI
{
bool BeginRewrite(MemoryRegion &mem_region)
{
    return VirtualProtect((LPVOID)mem_region.memory_offset,
                          (SIZE_T)mem_region.memory_length, 0x40, // 0x40 - enable everything?
                          &mem_region.old_reg_perm);
}

bool EndRewrite(MemoryRegion &mem_region)
{
    DWORD tmp_old_region_permission;
    bool b = VirtualProtect((LPVOID)mem_region.memory_offset,
                            (SIZE_T)mem_region.memory_length,
                            mem_region.old_reg_perm,
                            &tmp_old_region_permission) != 0;
    if (b)
        FlushInstructionCache((HANDLE)0xFFFFFFFF, 0, 0);
    return b;
}
 
unsigned int GAME_BASE;
int WINDOW_OFFSET;
unsigned int APPMAIN_OFFSET;
void SetGameBase()
{
    GAME_BASE = (unsigned int)GetModuleHandleA("spellforce.exe");
}

bool Init(HMODULE lib_module)
{
    if (!DisableThreadLibraryCalls(lib_module))
        return false;
    ASI::SetGameBase();
    if (CheckSFVersion(SF_154))
    {
        WINDOW_OFFSET = 0x97CB5C;
        APPMAIN_OFFSET = 0x9644D0;
    }
    if (CheckSFVersion(SF_BETA))
    {
        WINDOW_OFFSET = 0x93A25C;
        APPMAIN_OFFSET = 0x9229A8; // FIXME
    }
    return true;
}

bool __stdcall CheckSFVersion(SF_Version sf_version)
{
    switch (sf_version)
    {
        case SF_154:
            if (*(int *)ASI::AddrOf(0xEFF8) == 75000)   // 1.54.75000
                return true;
            break;
        case SF_161:
            if (*(int *)ASI::AddrOf(0x1E6EE6) == 10180) // 1.61.10180
                return true;
            break;
        case SF_BETA:
            if (*(int *)ASI::AddrOf(0x177e63) == 11213) // 1.61.11213
                return true;
        default:
            return false;
    }
    return false;
}
}