Method AnyKextPatch

rEFIt_UEFI/Platform/kext_patcher.cpp:1111–1211

/////////////////////////////// Generic kext patch functions

//
//
VOID LOADER_ENTRY::AnyKextPatch(UINT8 *Driver, UINT32 DriverSize, CHAR8 *InfoPlist, UINT32 InfoPlistSize, size_t N)
{
  UINTN   Num = 0;

  // if we modify value directly at KernelAndKextPatches->KextPatches[N].SearchLen, it will be wrong for next driver
  const KEXT_PATCH& kextpatch = KernelAndKextPatches.KextPatches[N];
  UINTN   SearchLen = kextpatch.SearchLen;
  
  DBG_RT("\nAnyKextPatch %zu: driverAddr = %llx, driverSize = %x\n  Label = %s\n",
         N, (UINTN)Driver, DriverSize, kextpatch.Label.c_str());
  DBG("\nAnyKextPatch %zu: driverAddr = %llx, driverSize = %x\n  Label = %s\n",
      N, (UINTN)Driver, DriverSize, kextpatch.Label.c_str());

  if (!kextpatch.MenuItem.BValue) {
    return;
  }

  
  if (!SearchLen ||
      (SearchLen > DriverSize)) {
    SearchLen = DriverSize;
  }

  if (KernelAndKextPatches.KPDebug) {
    ExtractKextBundleIdentifier(InfoPlist);
  }

	DBG_RT("Kext: %s\n", gKextBundleIdentifier);

  if (!kextpatch.IsPlistPatch) {
    // kext binary patch
    DBG_RT("Binary patch\n");
    bool once = false;
    UINTN procLen = 0;
    UINTN procAddr = searchProcInDriver(Driver, DriverSize, kextpatch.ProcedureName);
    
    if (SearchLen == DriverSize) {
      procLen = DriverSize - procAddr;
      once = true;
    } else {
      procLen = SearchLen;
    }
    UINT8 * curs = &Driver[procAddr];
    UINTN j = 0;
    while (j < DriverSize) {
      if (kextpatch.StartPattern.isEmpty() || //old behavior
          CompareMemMask((const UINT8*)curs,
                         kextpatch.StartPattern.data(),
                         kextpatch.StartPattern.size(),
                         kextpatch.StartMask.data(),
                         kextpatch.StartPattern.size())) {
        DBG_RT(" StartPattern found\n");

        Num = SearchAndReplaceMask(curs,
                                   procLen,
                                   kextpatch.Data.data(),
                                   kextpatch.MaskFind.data(),
                                   kextpatch.Data.size(),