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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 "core/fpdfdoc/cpdf_dest.h"
      8 
      9 #include "core/fpdfapi/parser/cpdf_array.h"
     10 #include "core/fpdfapi/parser/cpdf_document.h"
     11 #include "core/fpdfapi/parser/cpdf_name.h"
     12 #include "core/fpdfapi/parser/cpdf_number.h"
     13 
     14 namespace {
     15 
     16 const FX_CHAR* const g_sZoomModes[] = {"XYZ",  "Fit",   "FitH",  "FitV", "FitR",
     17                                        "FitB", "FitBH", "FitBV", nullptr};
     18 
     19 }  // namespace
     20 
     21 int CPDF_Dest::GetPageIndex(CPDF_Document* pDoc) {
     22   CPDF_Array* pArray = ToArray(m_pObj);
     23   if (!pArray)
     24     return 0;
     25 
     26   CPDF_Object* pPage = pArray->GetDirectObjectAt(0);
     27   if (!pPage)
     28     return 0;
     29   if (pPage->IsNumber())
     30     return pPage->GetInteger();
     31   if (!pPage->IsDictionary())
     32     return 0;
     33   return pDoc->GetPageIndex(pPage->GetObjNum());
     34 }
     35 
     36 uint32_t CPDF_Dest::GetPageObjNum() {
     37   CPDF_Array* pArray = ToArray(m_pObj);
     38   if (!pArray)
     39     return 0;
     40 
     41   CPDF_Object* pPage = pArray->GetDirectObjectAt(0);
     42   if (!pPage)
     43     return 0;
     44   if (pPage->IsNumber())
     45     return pPage->GetInteger();
     46   if (pPage->IsDictionary())
     47     return pPage->GetObjNum();
     48   return 0;
     49 }
     50 
     51 int CPDF_Dest::GetZoomMode() {
     52   CPDF_Array* pArray = ToArray(m_pObj);
     53   if (!pArray)
     54     return 0;
     55 
     56   CPDF_Object* pObj = pArray->GetDirectObjectAt(1);
     57   if (!pObj)
     58     return 0;
     59 
     60   CFX_ByteString mode = pObj->GetString();
     61   for (int i = 0; g_sZoomModes[i]; ++i) {
     62     if (mode == g_sZoomModes[i])
     63       return i + 1;
     64   }
     65 
     66   return 0;
     67 }
     68 
     69 bool CPDF_Dest::GetXYZ(bool* pHasX,
     70                        bool* pHasY,
     71                        bool* pHasZoom,
     72                        float* pX,
     73                        float* pY,
     74                        float* pZoom) const {
     75   *pHasX = false;
     76   *pHasY = false;
     77   *pHasZoom = false;
     78 
     79   CPDF_Array* pArray = ToArray(m_pObj);
     80   if (!pArray)
     81     return false;
     82 
     83   if (pArray->GetCount() < 5)
     84     return false;
     85 
     86   const CPDF_Name* xyz = ToName(pArray->GetDirectObjectAt(1));
     87   if (!xyz || xyz->GetString() != "XYZ")
     88     return false;
     89 
     90   const CPDF_Number* numX = ToNumber(pArray->GetDirectObjectAt(2));
     91   const CPDF_Number* numY = ToNumber(pArray->GetDirectObjectAt(3));
     92   const CPDF_Number* numZoom = ToNumber(pArray->GetDirectObjectAt(4));
     93 
     94   // If the value is a CPDF_Null then ToNumber will return nullptr.
     95   *pHasX = !!numX;
     96   *pHasY = !!numY;
     97   *pHasZoom = !!numZoom;
     98 
     99   if (numX)
    100     *pX = numX->GetNumber();
    101   if (numY)
    102     *pY = numY->GetNumber();
    103 
    104   // A zoom value of 0 is equivalent to a null value, so treat it as a null.
    105   if (numZoom) {
    106     float num = numZoom->GetNumber();
    107     if (num == 0.0)
    108       *pHasZoom = false;
    109     else
    110       *pZoom = num;
    111   }
    112 
    113   return true;
    114 }
    115 
    116 FX_FLOAT CPDF_Dest::GetParam(int index) {
    117   CPDF_Array* pArray = ToArray(m_pObj);
    118   return pArray ? pArray->GetNumberAt(2 + index) : 0;
    119 }
    120 
    121 CFX_ByteString CPDF_Dest::GetRemoteName() {
    122   return m_pObj ? m_pObj->GetString() : CFX_ByteString();
    123 }
    124