Function patchFunction

inject/injectee_iat.cpp:599–629

template< class T >
static BOOL
patchFunction(HMODULE hModule,
              const char *szModule,
              const char *pszDllName,
              T pImportDescriptor,
              const char *pszFunctionName,
              LPVOID lpOldAddress,
              LPVOID lpNewAddress)
{
    LPVOID* lpPatchAddress = getPatchAddress(hModule, pImportDescriptor, pszFunctionName, lpOldAddress);
    if (lpPatchAddress == NULL) {
        return FALSE;
    }

    if (*lpPatchAddress == lpNewAddress) {
        return TRUE;
    }

    DWORD Offset = (DWORD)(UINT_PTR)lpPatchAddress - (UINT_PTR)hModule;
    if (VERBOSITY > 0) {
        debugPrintf("inject: patching %s!0x%lx -> %s!%s\n", szModule, Offset, pszDllName, pszFunctionName);
    }

    BOOL bRet;
    bRet = replaceAddress(lpPatchAddress, lpNewAddress);
    if (!bRet) {
        debugPrintf("inject: failed to patch %s!0x%lx -> %s!%s\n", szModule, Offset, pszDllName, pszFunctionName);
    }

    return bRet;
}