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// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fpdfdoc/cpdf_dest.h"
#include <algorithm>
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_document.h"
#include "core/fpdfapi/parser/cpdf_name.h"
#include "core/fpdfapi/parser/cpdf_number.h"
namespace {
// These arrays are indexed by the PDFDEST_VIEW_* constants.
// Last element is a sentinel.
const char* const g_sZoomModes[] = {"Unknown", "XYZ", "Fit", "FitH",
"FitV", "FitR", "FitB", "FitBH",
"FitBV", nullptr};
const uint8_t g_sZoomModeMaxParamCount[] = {0, 3, 0, 1, 1, 4, 0, 1, 1, 0};
static_assert(FX_ArraySize(g_sZoomModes) ==
FX_ArraySize(g_sZoomModeMaxParamCount),
"Zoom mode count Mismatch");
} // namespace
CPDF_Dest::CPDF_Dest() {}
CPDF_Dest::CPDF_Dest(const CPDF_Dest& that) = default;
CPDF_Dest::CPDF_Dest(const CPDF_Array* pArray) : m_pArray(pArray) {}
CPDF_Dest::~CPDF_Dest() {}
int CPDF_Dest::GetDestPageIndex(CPDF_Document* pDoc) const {
if (!m_pArray)
return -1;
const CPDF_Object* pPage = m_pArray->GetDirectObjectAt(0);
if (!pPage)
return -1;
if (pPage->IsNumber())
return pPage->GetInteger();
if (!pPage->IsDictionary())
return -1;
return pDoc->GetPageIndex(pPage->GetObjNum());
}
uint32_t CPDF_Dest::GetPageObjNum() const {
if (!m_pArray)
return 0;
const CPDF_Object* pPage = m_pArray->GetDirectObjectAt(0);
if (!pPage)
return 0;
if (pPage->IsNumber())
return pPage->GetInteger();
if (pPage->IsDictionary())
return pPage->GetObjNum();
return 0;
}
int CPDF_Dest::GetZoomMode() const {
if (!m_pArray)
return 0;
const CPDF_Object* pArray = m_pArray->GetDirectObjectAt(1);
if (!pArray)
return 0;
ByteString mode = pArray->GetString();
for (int i = 1; g_sZoomModes[i]; ++i) {
if (mode == g_sZoomModes[i])
return i;
}
return 0;
}
bool CPDF_Dest::GetXYZ(bool* pHasX,
bool* pHasY,
bool* pHasZoom,
float* pX,
float* pY,
float* pZoom) const {
*pHasX = false;
*pHasY = false;
*pHasZoom = false;
if (!m_pArray)
return false;
if (m_pArray->GetCount() < 5)
return false;
const CPDF_Name* xyz = ToName(m_pArray->GetDirectObjectAt(1));
if (!xyz || xyz->GetString() != "XYZ")
return false;
const CPDF_Number* numX = ToNumber(m_pArray->GetDirectObjectAt(2));
const CPDF_Number* numY = ToNumber(m_pArray->GetDirectObjectAt(3));
const CPDF_Number* numZoom = ToNumber(m_pArray->GetDirectObjectAt(4));
// If the value is a CPDF_Null then ToNumber will return nullptr.
*pHasX = !!numX;
*pHasY = !!numY;
*pHasZoom = !!numZoom;
if (numX)
*pX = numX->GetNumber();
if (numY)
*pY = numY->GetNumber();
// A zoom value of 0 is equivalent to a null value, so treat it as a null.
if (numZoom) {
float num = numZoom->GetNumber();
if (num == 0.0)
*pHasZoom = false;
else
*pZoom = num;
}
return true;
}
unsigned long CPDF_Dest::GetNumParams() const {
if (!m_pArray || m_pArray->GetCount() < 2)
return 0;
unsigned long maxParamsForFitType = g_sZoomModeMaxParamCount[GetZoomMode()];
unsigned long numParamsInArray = m_pArray->GetCount() - 2;
return std::min(maxParamsForFitType, numParamsInArray);
}
float CPDF_Dest::GetParam(int index) const {
return m_pArray ? m_pArray->GetNumberAt(2 + index) : 0;
}
ByteString CPDF_Dest::GetRemoteName() const {
return m_pArray ? m_pArray->GetString() : ByteString();
}
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