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      1 // Copyright 2016 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #include "fpdfsdk/cpdfsdk_pageview.h"
      8 
      9 #include <memory>
     10 #include <vector>
     11 
     12 #include "core/fpdfapi/parser/cpdf_document.h"
     13 #include "core/fpdfapi/render/cpdf_renderoptions.h"
     14 #include "core/fpdfdoc/cpdf_annotlist.h"
     15 #include "core/fpdfdoc/cpdf_interform.h"
     16 #include "fpdfsdk/cpdfsdk_annot.h"
     17 #include "fpdfsdk/cpdfsdk_annothandlermgr.h"
     18 #include "fpdfsdk/cpdfsdk_annotiteration.h"
     19 #include "fpdfsdk/cpdfsdk_formfillenvironment.h"
     20 #include "fpdfsdk/cpdfsdk_interform.h"
     21 #include "third_party/base/ptr_util.h"
     22 
     23 #ifdef PDF_ENABLE_XFA
     24 #include "fpdfsdk/fpdfxfa/cpdfxfa_page.h"
     25 #include "xfa/fxfa/xfa_ffdocview.h"
     26 #include "xfa/fxfa/xfa_ffpageview.h"
     27 #include "xfa/fxfa/xfa_ffwidgethandler.h"
     28 #include "xfa/fxfa/xfa_rendercontext.h"
     29 #include "xfa/fxgraphics/cfx_graphics.h"
     30 #endif  // PDF_ENABLE_XFA
     31 
     32 CPDFSDK_PageView::CPDFSDK_PageView(CPDFSDK_FormFillEnvironment* pFormFillEnv,
     33                                    UnderlyingPageType* page)
     34     : m_page(page),
     35       m_pFormFillEnv(pFormFillEnv),
     36 #ifndef PDF_ENABLE_XFA
     37       m_bOwnsPage(false),
     38 #endif  // PDF_ENABLE_XFA
     39       m_bEnterWidget(false),
     40       m_bExitWidget(false),
     41       m_bOnWidget(false),
     42       m_bValid(false),
     43       m_bLocked(false),
     44       m_bBeingDestroyed(false) {
     45   CPDFSDK_InterForm* pInterForm = pFormFillEnv->GetInterForm();
     46   if (pInterForm) {
     47     CPDF_InterForm* pPDFInterForm = pInterForm->GetInterForm();
     48 #ifdef PDF_ENABLE_XFA
     49     if (page->GetPDFPage())
     50       pPDFInterForm->FixPageFields(page->GetPDFPage());
     51 #else   // PDF_ENABLE_XFA
     52     pPDFInterForm->FixPageFields(page);
     53 #endif  // PDF_ENABLE_XFA
     54   }
     55 #ifndef PDF_ENABLE_XFA
     56   m_page->SetView(this);
     57 #endif  // PDF_ENABLE_XFA
     58 }
     59 
     60 CPDFSDK_PageView::~CPDFSDK_PageView() {
     61 #ifndef PDF_ENABLE_XFA
     62   // The call to |ReleaseAnnot| can cause the page pointed to by |m_page| to
     63   // be freed, which will cause issues if we try to cleanup the pageview pointer
     64   // in |m_page|. So, reset the pageview pointer before doing anything else.
     65   m_page->SetView(nullptr);
     66 #endif  // PDF_ENABLE_XFA
     67 
     68   CPDFSDK_AnnotHandlerMgr* pAnnotHandlerMgr =
     69       m_pFormFillEnv->GetAnnotHandlerMgr();
     70   for (CPDFSDK_Annot* pAnnot : m_SDKAnnotArray)
     71     pAnnotHandlerMgr->ReleaseAnnot(pAnnot);
     72 
     73   m_SDKAnnotArray.clear();
     74   m_pAnnotList.reset();
     75 
     76 #ifndef PDF_ENABLE_XFA
     77   if (m_bOwnsPage)
     78     delete m_page;
     79 #endif  // PDF_ENABLE_XFA
     80 }
     81 
     82 void CPDFSDK_PageView::PageView_OnDraw(CFX_RenderDevice* pDevice,
     83                                        CFX_Matrix* pUser2Device,
     84 #ifdef PDF_ENABLE_XFA
     85                                        CPDF_RenderOptions* pOptions,
     86                                        const FX_RECT& pClip) {
     87 #else
     88                                        CPDF_RenderOptions* pOptions) {
     89 #endif  // PDF_ENABLE_XFA
     90   m_curMatrix = *pUser2Device;
     91 
     92 #ifdef PDF_ENABLE_XFA
     93   CPDFXFA_Page* pPage = GetPDFXFAPage();
     94   if (!pPage)
     95     return;
     96 
     97   if (pPage->GetContext()->GetDocType() == DOCTYPE_DYNAMIC_XFA) {
     98     CFX_Graphics gs(pDevice);
     99     CFX_RectF rectClip(static_cast<FX_FLOAT>(pClip.left),
    100                        static_cast<FX_FLOAT>(pClip.top),
    101                        static_cast<FX_FLOAT>(pClip.Width()),
    102                        static_cast<FX_FLOAT>(pClip.Height()));
    103     gs.SetClipRect(rectClip);
    104     std::unique_ptr<CXFA_RenderContext> pRenderContext(new CXFA_RenderContext);
    105     CXFA_RenderOptions renderOptions;
    106     renderOptions.m_bHighlight = true;
    107     CXFA_FFPageView* xfaView = pPage->GetXFAPageView();
    108     pRenderContext->StartRender(xfaView, &gs, *pUser2Device, renderOptions);
    109     pRenderContext->DoRender();
    110     pRenderContext->StopRender();
    111     CXFA_FFDocView* docView = xfaView->GetDocView();
    112     if (!docView)
    113       return;
    114     CPDFSDK_Annot* annot = GetFocusAnnot();
    115     if (!annot)
    116       return;
    117     // Render the focus widget
    118     docView->GetWidgetHandler()->RenderWidget(annot->GetXFAWidget(), &gs,
    119                                               pUser2Device, false);
    120     return;
    121   }
    122 #endif  // PDF_ENABLE_XFA
    123 
    124   // for pdf/static xfa.
    125   CPDFSDK_AnnotIteration annotIteration(this, true);
    126   for (const auto& pSDKAnnot : annotIteration) {
    127     m_pFormFillEnv->GetAnnotHandlerMgr()->Annot_OnDraw(
    128         this, pSDKAnnot.Get(), pDevice, pUser2Device, pOptions->m_bDrawAnnots);
    129   }
    130 }
    131 
    132 CPDFSDK_Annot* CPDFSDK_PageView::GetFXAnnotAtPoint(const CFX_PointF& point) {
    133   CPDFSDK_AnnotHandlerMgr* pAnnotMgr = m_pFormFillEnv->GetAnnotHandlerMgr();
    134   CPDFSDK_AnnotIteration annotIteration(this, false);
    135   for (const auto& pSDKAnnot : annotIteration) {
    136     CFX_FloatRect rc = pAnnotMgr->Annot_OnGetViewBBox(this, pSDKAnnot.Get());
    137     if (pSDKAnnot->GetAnnotSubtype() == CPDF_Annot::Subtype::POPUP)
    138       continue;
    139     if (rc.Contains(point))
    140       return pSDKAnnot.Get();
    141   }
    142   return nullptr;
    143 }
    144 
    145 CPDFSDK_Annot* CPDFSDK_PageView::GetFXWidgetAtPoint(const CFX_PointF& point) {
    146   CPDFSDK_AnnotHandlerMgr* pAnnotMgr = m_pFormFillEnv->GetAnnotHandlerMgr();
    147   CPDFSDK_AnnotIteration annotIteration(this, false);
    148   for (const auto& pSDKAnnot : annotIteration) {
    149     bool bHitTest = pSDKAnnot->GetAnnotSubtype() == CPDF_Annot::Subtype::WIDGET;
    150 #ifdef PDF_ENABLE_XFA
    151     bHitTest = bHitTest ||
    152                pSDKAnnot->GetAnnotSubtype() == CPDF_Annot::Subtype::XFAWIDGET;
    153 #endif  // PDF_ENABLE_XFA
    154     if (bHitTest) {
    155       pAnnotMgr->Annot_OnGetViewBBox(this, pSDKAnnot.Get());
    156       if (pAnnotMgr->Annot_OnHitTest(this, pSDKAnnot.Get(), point))
    157         return pSDKAnnot.Get();
    158     }
    159   }
    160   return nullptr;
    161 }
    162 
    163 #ifdef PDF_ENABLE_XFA
    164 CPDFSDK_Annot* CPDFSDK_PageView::AddAnnot(CXFA_FFWidget* pPDFAnnot) {
    165   if (!pPDFAnnot)
    166     return nullptr;
    167 
    168   CPDFSDK_Annot* pSDKAnnot = GetAnnotByXFAWidget(pPDFAnnot);
    169   if (pSDKAnnot)
    170     return pSDKAnnot;
    171 
    172   CPDFSDK_AnnotHandlerMgr* pAnnotHandler = m_pFormFillEnv->GetAnnotHandlerMgr();
    173   pSDKAnnot = pAnnotHandler->NewAnnot(pPDFAnnot, this);
    174   if (!pSDKAnnot)
    175     return nullptr;
    176 
    177   m_SDKAnnotArray.push_back(pSDKAnnot);
    178   return pSDKAnnot;
    179 }
    180 
    181 bool CPDFSDK_PageView::DeleteAnnot(CPDFSDK_Annot* pAnnot) {
    182   if (!pAnnot)
    183     return false;
    184   CPDFXFA_Page* pPage = pAnnot->GetPDFXFAPage();
    185   if (!pPage || (pPage->GetContext()->GetDocType() != DOCTYPE_STATIC_XFA &&
    186                  pPage->GetContext()->GetDocType() != DOCTYPE_DYNAMIC_XFA))
    187     return false;
    188 
    189   if (GetFocusAnnot() == pAnnot)
    190     m_pFormFillEnv->KillFocusAnnot(0);
    191   CPDFSDK_AnnotHandlerMgr* pAnnotHandler = m_pFormFillEnv->GetAnnotHandlerMgr();
    192   if (pAnnotHandler)
    193     pAnnotHandler->ReleaseAnnot(pAnnot);
    194 
    195   auto it = std::find(m_SDKAnnotArray.begin(), m_SDKAnnotArray.end(), pAnnot);
    196   if (it != m_SDKAnnotArray.end())
    197     m_SDKAnnotArray.erase(it);
    198   if (m_pCaptureWidget.Get() == pAnnot)
    199     m_pCaptureWidget.Reset();
    200 
    201   return true;
    202 }
    203 #endif  // PDF_ENABLE_XFA
    204 
    205 CPDF_Document* CPDFSDK_PageView::GetPDFDocument() {
    206   if (m_page) {
    207 #ifdef PDF_ENABLE_XFA
    208     return m_page->GetContext()->GetPDFDoc();
    209 #else   // PDF_ENABLE_XFA
    210     return m_page->m_pDocument;
    211 #endif  // PDF_ENABLE_XFA
    212   }
    213   return nullptr;
    214 }
    215 
    216 CPDF_Page* CPDFSDK_PageView::GetPDFPage() const {
    217 #ifdef PDF_ENABLE_XFA
    218   return m_page ? m_page->GetPDFPage() : nullptr;
    219 #else   // PDF_ENABLE_XFA
    220   return m_page;
    221 #endif  // PDF_ENABLE_XFA
    222 }
    223 
    224 CPDFSDK_Annot* CPDFSDK_PageView::GetAnnotByDict(CPDF_Dictionary* pDict) {
    225   for (CPDFSDK_Annot* pAnnot : m_SDKAnnotArray) {
    226     if (pAnnot->GetPDFAnnot()->GetAnnotDict() == pDict)
    227       return pAnnot;
    228   }
    229   return nullptr;
    230 }
    231 
    232 #ifdef PDF_ENABLE_XFA
    233 CPDFSDK_Annot* CPDFSDK_PageView::GetAnnotByXFAWidget(CXFA_FFWidget* hWidget) {
    234   if (!hWidget)
    235     return nullptr;
    236 
    237   for (CPDFSDK_Annot* pAnnot : m_SDKAnnotArray) {
    238     if (pAnnot->GetXFAWidget() == hWidget)
    239       return pAnnot;
    240   }
    241   return nullptr;
    242 }
    243 #endif  // PDF_ENABLE_XFA
    244 
    245 bool CPDFSDK_PageView::OnLButtonDown(const CFX_PointF& point, uint32_t nFlag) {
    246   CPDFSDK_Annot::ObservedPtr pAnnot(GetFXWidgetAtPoint(point));
    247   if (!pAnnot) {
    248     m_pFormFillEnv->KillFocusAnnot(nFlag);
    249     return false;
    250   }
    251 
    252   CPDFSDK_AnnotHandlerMgr* pAnnotHandlerMgr =
    253       m_pFormFillEnv->GetAnnotHandlerMgr();
    254   if (!pAnnotHandlerMgr->Annot_OnLButtonDown(this, &pAnnot, nFlag, point))
    255     return false;
    256 
    257   if (!pAnnot)
    258     return false;
    259 
    260   m_pFormFillEnv->SetFocusAnnot(&pAnnot);
    261   return true;
    262 }
    263 
    264 #ifdef PDF_ENABLE_XFA
    265 bool CPDFSDK_PageView::OnRButtonDown(const CFX_PointF& point, uint32_t nFlag) {
    266   CPDFSDK_Annot::ObservedPtr pAnnot(GetFXWidgetAtPoint(point));
    267   if (!pAnnot)
    268     return false;
    269 
    270   CPDFSDK_AnnotHandlerMgr* pAnnotHandlerMgr =
    271       m_pFormFillEnv->GetAnnotHandlerMgr();
    272   bool ok = pAnnotHandlerMgr->Annot_OnRButtonDown(this, &pAnnot, nFlag, point);
    273   if (!pAnnot)
    274     return false;
    275 
    276   if (ok)
    277     m_pFormFillEnv->SetFocusAnnot(&pAnnot);
    278 
    279   return true;
    280 }
    281 
    282 bool CPDFSDK_PageView::OnRButtonUp(const CFX_PointF& point, uint32_t nFlag) {
    283   CPDFSDK_AnnotHandlerMgr* pAnnotHandlerMgr =
    284       m_pFormFillEnv->GetAnnotHandlerMgr();
    285   CPDFSDK_Annot::ObservedPtr pFXAnnot(GetFXWidgetAtPoint(point));
    286   if (!pFXAnnot)
    287     return false;
    288 
    289   if (pAnnotHandlerMgr->Annot_OnRButtonUp(this, &pFXAnnot, nFlag, point))
    290     m_pFormFillEnv->SetFocusAnnot(&pFXAnnot);
    291 
    292   return true;
    293 }
    294 #endif  // PDF_ENABLE_XFA
    295 
    296 bool CPDFSDK_PageView::OnLButtonUp(const CFX_PointF& point, uint32_t nFlag) {
    297   CPDFSDK_AnnotHandlerMgr* pAnnotHandlerMgr =
    298       m_pFormFillEnv->GetAnnotHandlerMgr();
    299   CPDFSDK_Annot::ObservedPtr pFXAnnot(GetFXWidgetAtPoint(point));
    300   CPDFSDK_Annot::ObservedPtr pFocusAnnot(GetFocusAnnot());
    301   if (pFocusAnnot && pFocusAnnot != pFXAnnot) {
    302     // Last focus Annot gets a chance to handle the event.
    303     if (pAnnotHandlerMgr->Annot_OnLButtonUp(this, &pFocusAnnot, nFlag, point))
    304       return true;
    305   }
    306   return pFXAnnot &&
    307          pAnnotHandlerMgr->Annot_OnLButtonUp(this, &pFXAnnot, nFlag, point);
    308 }
    309 
    310 bool CPDFSDK_PageView::OnMouseMove(const CFX_PointF& point, int nFlag) {
    311   CPDFSDK_AnnotHandlerMgr* pAnnotHandlerMgr =
    312       m_pFormFillEnv->GetAnnotHandlerMgr();
    313   CPDFSDK_Annot::ObservedPtr pFXAnnot(GetFXAnnotAtPoint(point));
    314   if (pFXAnnot) {
    315     if (m_pCaptureWidget && m_pCaptureWidget != pFXAnnot) {
    316       m_bExitWidget = true;
    317       m_bEnterWidget = false;
    318       pAnnotHandlerMgr->Annot_OnMouseExit(this, &m_pCaptureWidget, nFlag);
    319     }
    320     m_pCaptureWidget.Reset(pFXAnnot.Get());
    321     m_bOnWidget = true;
    322     if (!m_bEnterWidget) {
    323       m_bEnterWidget = true;
    324       m_bExitWidget = false;
    325       pAnnotHandlerMgr->Annot_OnMouseEnter(this, &pFXAnnot, nFlag);
    326     }
    327     pAnnotHandlerMgr->Annot_OnMouseMove(this, &pFXAnnot, nFlag, point);
    328     return true;
    329   }
    330   if (m_bOnWidget) {
    331     m_bOnWidget = false;
    332     m_bExitWidget = true;
    333     m_bEnterWidget = false;
    334     if (m_pCaptureWidget) {
    335       pAnnotHandlerMgr->Annot_OnMouseExit(this, &m_pCaptureWidget, nFlag);
    336       m_pCaptureWidget.Reset();
    337     }
    338   }
    339   return false;
    340 }
    341 
    342 bool CPDFSDK_PageView::OnMouseWheel(double deltaX,
    343                                     double deltaY,
    344                                     const CFX_PointF& point,
    345                                     int nFlag) {
    346   CPDFSDK_Annot::ObservedPtr pAnnot(GetFXWidgetAtPoint(point));
    347   if (!pAnnot)
    348     return false;
    349 
    350   CPDFSDK_AnnotHandlerMgr* pAnnotHandlerMgr =
    351       m_pFormFillEnv->GetAnnotHandlerMgr();
    352   return pAnnotHandlerMgr->Annot_OnMouseWheel(this, &pAnnot, nFlag, (int)deltaY,
    353                                               point);
    354 }
    355 
    356 bool CPDFSDK_PageView::OnChar(int nChar, uint32_t nFlag) {
    357   if (CPDFSDK_Annot* pAnnot = GetFocusAnnot()) {
    358     CPDFSDK_AnnotHandlerMgr* pAnnotHandlerMgr =
    359         m_pFormFillEnv->GetAnnotHandlerMgr();
    360     return pAnnotHandlerMgr->Annot_OnChar(pAnnot, nChar, nFlag);
    361   }
    362 
    363   return false;
    364 }
    365 
    366 bool CPDFSDK_PageView::OnKeyDown(int nKeyCode, int nFlag) {
    367   if (CPDFSDK_Annot* pAnnot = GetFocusAnnot()) {
    368     CPDFSDK_AnnotHandlerMgr* pAnnotHandlerMgr =
    369         m_pFormFillEnv->GetAnnotHandlerMgr();
    370     return pAnnotHandlerMgr->Annot_OnKeyDown(pAnnot, nKeyCode, nFlag);
    371   }
    372   return false;
    373 }
    374 
    375 bool CPDFSDK_PageView::OnKeyUp(int nKeyCode, int nFlag) {
    376   return false;
    377 }
    378 
    379 void CPDFSDK_PageView::LoadFXAnnots() {
    380   CPDFSDK_AnnotHandlerMgr* pAnnotHandlerMgr =
    381       m_pFormFillEnv->GetAnnotHandlerMgr();
    382 
    383   SetLock(true);
    384 
    385 #ifdef PDF_ENABLE_XFA
    386   CFX_RetainPtr<CPDFXFA_Page> protector(m_page);
    387   if (m_pFormFillEnv->GetXFAContext()->GetDocType() == DOCTYPE_DYNAMIC_XFA) {
    388     CXFA_FFPageView* pageView = m_page->GetXFAPageView();
    389     std::unique_ptr<IXFA_WidgetIterator> pWidgetHander(
    390         pageView->CreateWidgetIterator(
    391             XFA_TRAVERSEWAY_Form,
    392             XFA_WidgetStatus_Visible | XFA_WidgetStatus_Viewable));
    393     if (!pWidgetHander) {
    394       SetLock(false);
    395       return;
    396     }
    397 
    398     while (CXFA_FFWidget* pXFAAnnot = pWidgetHander->MoveToNext()) {
    399       CPDFSDK_Annot* pAnnot = pAnnotHandlerMgr->NewAnnot(pXFAAnnot, this);
    400       if (!pAnnot)
    401         continue;
    402       m_SDKAnnotArray.push_back(pAnnot);
    403       pAnnotHandlerMgr->Annot_OnLoad(pAnnot);
    404     }
    405 
    406     SetLock(false);
    407     return;
    408   }
    409 #endif  // PDF_ENABLE_XFA
    410 
    411   CPDF_Page* pPage = GetPDFPage();
    412   ASSERT(pPage);
    413   bool bUpdateAP = CPDF_InterForm::IsUpdateAPEnabled();
    414   // Disable the default AP construction.
    415   CPDF_InterForm::SetUpdateAP(false);
    416   m_pAnnotList = pdfium::MakeUnique<CPDF_AnnotList>(pPage);
    417   CPDF_InterForm::SetUpdateAP(bUpdateAP);
    418 
    419   const size_t nCount = m_pAnnotList->Count();
    420   for (size_t i = 0; i < nCount; ++i) {
    421     CPDF_Annot* pPDFAnnot = m_pAnnotList->GetAt(i);
    422     CheckUnSupportAnnot(GetPDFDocument(), pPDFAnnot);
    423     CPDFSDK_Annot* pAnnot = pAnnotHandlerMgr->NewAnnot(pPDFAnnot, this);
    424     if (!pAnnot)
    425       continue;
    426     m_SDKAnnotArray.push_back(pAnnot);
    427     pAnnotHandlerMgr->Annot_OnLoad(pAnnot);
    428   }
    429 
    430   SetLock(false);
    431 }
    432 
    433 void CPDFSDK_PageView::UpdateRects(const std::vector<CFX_FloatRect>& rects) {
    434   for (const auto& rc : rects)
    435     m_pFormFillEnv->Invalidate(m_page, rc.ToFxRect());
    436 }
    437 
    438 void CPDFSDK_PageView::UpdateView(CPDFSDK_Annot* pAnnot) {
    439   CFX_FloatRect rcWindow = pAnnot->GetRect();
    440   m_pFormFillEnv->Invalidate(m_page, rcWindow.ToFxRect());
    441 }
    442 
    443 int CPDFSDK_PageView::GetPageIndex() const {
    444   if (!m_page)
    445     return -1;
    446 
    447 #ifdef PDF_ENABLE_XFA
    448   int nDocType = m_page->GetContext()->GetDocType();
    449   switch (nDocType) {
    450     case DOCTYPE_DYNAMIC_XFA: {
    451       CXFA_FFPageView* pPageView = m_page->GetXFAPageView();
    452       return pPageView ? pPageView->GetPageIndex() : -1;
    453     }
    454     case DOCTYPE_STATIC_XFA:
    455     case DOCTYPE_PDF:
    456       return GetPageIndexForStaticPDF();
    457     default:
    458       return -1;
    459   }
    460 #else   // PDF_ENABLE_XFA
    461   return GetPageIndexForStaticPDF();
    462 #endif  // PDF_ENABLE_XFA
    463 }
    464 
    465 bool CPDFSDK_PageView::IsValidAnnot(const CPDF_Annot* p) const {
    466   if (!p)
    467     return false;
    468 
    469   const auto& annots = m_pAnnotList->All();
    470   auto it = std::find_if(annots.begin(), annots.end(),
    471                          [p](const std::unique_ptr<CPDF_Annot>& annot) {
    472                            return annot.get() == p;
    473                          });
    474   return it != annots.end();
    475 }
    476 
    477 bool CPDFSDK_PageView::IsValidSDKAnnot(const CPDFSDK_Annot* p) const {
    478   if (!p)
    479     return false;
    480   return pdfium::ContainsValue(m_SDKAnnotArray, p);
    481 }
    482 
    483 CPDFSDK_Annot* CPDFSDK_PageView::GetFocusAnnot() {
    484   CPDFSDK_Annot* pFocusAnnot = m_pFormFillEnv->GetFocusAnnot();
    485   return IsValidSDKAnnot(pFocusAnnot) ? pFocusAnnot : nullptr;
    486 }
    487 
    488 int CPDFSDK_PageView::GetPageIndexForStaticPDF() const {
    489   CPDF_Dictionary* pDict = GetPDFPage()->m_pFormDict;
    490   CPDF_Document* pDoc = m_pFormFillEnv->GetPDFDocument();
    491   return (pDoc && pDict) ? pDoc->GetPageIndex(pDict->GetObjNum()) : -1;
    492 }
    493