1 files changed, 545 insertions, 0 deletions

diff --git a/core/fpdfapi/page/cpdf_docpagedata.cpp b/core/fpdfapi/page/cpdf_docpagedata.cpp
new file mode 100644
index 0000000000..7a85e60da2
--- /dev/null
+++ b/core/fpdfapi/page/cpdf_docpagedata.cpp
@@ -0,0 +1,545 @@
+// Copyright 2014 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/fpdfapi/page/cpdf_docpagedata.h"
+
+#include <algorithm>
+#include <set>
+
+#include "core/fdrm/crypto/fx_crypt.h"
+#include "core/fpdfapi/cpdf_modulemgr.h"
+#include "core/fpdfapi/font/cpdf_type1font.h"
+#include "core/fpdfapi/font/font_int.h"
+#include "core/fpdfapi/page/cpdf_image.h"
+#include "core/fpdfapi/page/cpdf_pagemodule.h"
+#include "core/fpdfapi/page/cpdf_pattern.h"
+#include "core/fpdfapi/page/cpdf_shadingpattern.h"
+#include "core/fpdfapi/page/cpdf_tilingpattern.h"
+#include "core/fpdfapi/parser/cpdf_array.h"
+#include "core/fpdfapi/parser/cpdf_dictionary.h"
+#include "core/fpdfapi/parser/cpdf_document.h"
+#include "core/fpdfapi/parser/cpdf_stream_acc.h"
+#include "third_party/base/stl_util.h"
+
+CPDF_DocPageData::CPDF_DocPageData(CPDF_Document* pPDFDoc)
+    : m_pPDFDoc(pPDFDoc), m_bForceClear(false) {}
+
+CPDF_DocPageData::~CPDF_DocPageData() {
+  Clear(false);
+  Clear(true);
+
+  for (auto& it : m_PatternMap)
+    delete it.second;
+  m_PatternMap.clear();
+
+  for (auto& it : m_FontMap)
+    delete it.second;
+  m_FontMap.clear();
+
+  for (auto& it : m_ColorSpaceMap)
+    delete it.second;
+  m_ColorSpaceMap.clear();
+}
+
+void CPDF_DocPageData::Clear(bool bForceRelease) {
+  m_bForceClear = bForceRelease;
+
+  for (auto& it : m_PatternMap) {
+    CPDF_CountedPattern* ptData = it.second;
+    if (!ptData->get())
+      continue;
+
+    if (bForceRelease || ptData->use_count() < 2)
+      ptData->clear();
+  }
+
+  for (auto& it : m_FontMap) {
+    CPDF_CountedFont* fontData = it.second;
+    if (!fontData->get())
+      continue;
+
+    if (bForceRelease || fontData->use_count() < 2) {
+      fontData->clear();
+    }
+  }
+
+  for (auto& it : m_ColorSpaceMap) {
+    CPDF_CountedColorSpace* csData = it.second;
+    if (!csData->get())
+      continue;
+
+    if (bForceRelease || csData->use_count() < 2) {
+      csData->get()->Release();
+      csData->reset(nullptr);
+    }
+  }
+
+  for (auto it = m_IccProfileMap.begin(); it != m_IccProfileMap.end();) {
+    auto curr_it = it++;
+    CPDF_CountedIccProfile* ipData = curr_it->second;
+    if (!ipData->get())
+      continue;
+
+    if (bForceRelease || ipData->use_count() < 2) {
+      for (auto hash_it = m_HashProfileMap.begin();
+           hash_it != m_HashProfileMap.end(); ++hash_it) {
+        if (curr_it->first == hash_it->second) {
+          m_HashProfileMap.erase(hash_it);
+          break;
+        }
+      }
+      delete ipData->get();
+      delete ipData;
+      m_IccProfileMap.erase(curr_it);
+    }
+  }
+
+  for (auto it = m_FontFileMap.begin(); it != m_FontFileMap.end();) {
+    auto curr_it = it++;
+    CPDF_CountedStreamAcc* pCountedFont = curr_it->second;
+    if (!pCountedFont->get())
+      continue;
+
+    if (bForceRelease || pCountedFont->use_count() < 2) {
+      delete pCountedFont->get();
+      delete pCountedFont;
+      m_FontFileMap.erase(curr_it);
+    }
+  }
+
+  for (auto it = m_ImageMap.begin(); it != m_ImageMap.end();) {
+    auto curr_it = it++;
+    CPDF_CountedImage* pCountedImage = curr_it->second;
+    if (!pCountedImage->get())
+      continue;
+
+    if (bForceRelease || pCountedImage->use_count() < 2) {
+      delete pCountedImage->get();
+      delete pCountedImage;
+      m_ImageMap.erase(curr_it);
+    }
+  }
+}
+
+CPDF_Font* CPDF_DocPageData::GetFont(CPDF_Dictionary* pFontDict) {
+  if (!pFontDict)
+    return nullptr;
+
+  CPDF_CountedFont* pFontData = nullptr;
+  auto it = m_FontMap.find(pFontDict);
+  if (it != m_FontMap.end()) {
+    pFontData = it->second;
+    if (pFontData->get()) {
+      return pFontData->AddRef();
+    }
+  }
+  std::unique_ptr<CPDF_Font> pFont = CPDF_Font::Create(m_pPDFDoc, pFontDict);
+  if (!pFont)
+    return nullptr;
+
+  if (pFontData) {
+    pFontData->reset(pFont.release());
+  } else {
+    pFontData = new CPDF_CountedFont(pFont.release());
+    m_FontMap[pFontDict] = pFontData;
+  }
+  return pFontData->AddRef();
+}
+
+CPDF_Font* CPDF_DocPageData::GetStandardFont(const CFX_ByteString& fontName,
+                                             CPDF_FontEncoding* pEncoding) {
+  if (fontName.IsEmpty())
+    return nullptr;
+
+  for (auto& it : m_FontMap) {
+    CPDF_CountedFont* fontData = it.second;
+    CPDF_Font* pFont = fontData->get();
+    if (!pFont)
+      continue;
+    if (pFont->GetBaseFont() != fontName)
+      continue;
+    if (pFont->IsEmbedded())
+      continue;
+    if (!pFont->IsType1Font())
+      continue;
+    if (pFont->GetFontDict()->KeyExist("Widths"))
+      continue;
+
+    CPDF_Type1Font* pT1Font = pFont->AsType1Font();
+    if (pEncoding && !pT1Font->GetEncoding()->IsIdentical(pEncoding))
+      continue;
+
+    return fontData->AddRef();
+  }
+
+  CPDF_Dictionary* pDict = new CPDF_Dictionary(m_pPDFDoc->GetByteStringPool());
+  pDict->SetNameFor("Type", "Font");
+  pDict->SetNameFor("Subtype", "Type1");
+  pDict->SetNameFor("BaseFont", fontName);
+  if (pEncoding) {
+    pDict->SetFor("Encoding",
+                  pEncoding->Realize(m_pPDFDoc->GetByteStringPool()));
+  }
+  m_pPDFDoc->AddIndirectObject(pDict);
+  std::unique_ptr<CPDF_Font> pFont = CPDF_Font::Create(m_pPDFDoc, pDict);
+  if (!pFont)
+    return nullptr;
+
+  CPDF_CountedFont* fontData = new CPDF_CountedFont(pFont.release());
+  m_FontMap[pDict] = fontData;
+  return fontData->AddRef();
+}
+
+void CPDF_DocPageData::ReleaseFont(const CPDF_Dictionary* pFontDict) {
+  if (!pFontDict)
+    return;
+
+  auto it = m_FontMap.find(pFontDict);
+  if (it == m_FontMap.end())
+    return;
+
+  CPDF_CountedFont* pFontData = it->second;
+  if (!pFontData->get())
+    return;
+
+  pFontData->RemoveRef();
+  if (pFontData->use_count() > 1)
+    return;
+
+  // We have font data only in m_FontMap cache. Clean it.
+  pFontData->clear();
+}
+
+CPDF_ColorSpace* CPDF_DocPageData::GetColorSpace(
+    CPDF_Object* pCSObj,
+    const CPDF_Dictionary* pResources) {
+  std::set<CPDF_Object*> visited;
+  return GetColorSpaceImpl(pCSObj, pResources, &visited);
+}
+
+CPDF_ColorSpace* CPDF_DocPageData::GetColorSpaceImpl(
+    CPDF_Object* pCSObj,
+    const CPDF_Dictionary* pResources,
+    std::set<CPDF_Object*>* pVisited) {
+  if (!pCSObj)
+    return nullptr;
+
+  if (pdfium::ContainsKey(*pVisited, pCSObj))
+    return nullptr;
+
+  if (pCSObj->IsName()) {
+    CFX_ByteString name = pCSObj->GetString();
+    CPDF_ColorSpace* pCS = CPDF_ColorSpace::ColorspaceFromName(name);
+    if (!pCS && pResources) {
+      CPDF_Dictionary* pList = pResources->GetDictFor("ColorSpace");
+      if (pList) {
+        pdfium::ScopedSetInsertion<CPDF_Object*> insertion(pVisited, pCSObj);
+        return GetColorSpaceImpl(pList->GetDirectObjectFor(name), nullptr,
+                                 pVisited);
+      }
+    }
+    if (!pCS || !pResources)
+      return pCS;
+
+    CPDF_Dictionary* pColorSpaces = pResources->GetDictFor("ColorSpace");
+    if (!pColorSpaces)
+      return pCS;
+
+    CPDF_Object* pDefaultCS = nullptr;
+    switch (pCS->GetFamily()) {
+      case PDFCS_DEVICERGB:
+        pDefaultCS = pColorSpaces->GetDirectObjectFor("DefaultRGB");
+        break;
+      case PDFCS_DEVICEGRAY:
+        pDefaultCS = pColorSpaces->GetDirectObjectFor("DefaultGray");
+        break;
+      case PDFCS_DEVICECMYK:
+        pDefaultCS = pColorSpaces->GetDirectObjectFor("DefaultCMYK");
+        break;
+    }
+    if (!pDefaultCS)
+      return pCS;
+
+    pdfium::ScopedSetInsertion<CPDF_Object*> insertion(pVisited, pCSObj);
+    return GetColorSpaceImpl(pDefaultCS, nullptr, pVisited);
+  }
+
+  CPDF_Array* pArray = pCSObj->AsArray();
+  if (!pArray || pArray->IsEmpty())
+    return nullptr;
+
+  if (pArray->GetCount() == 1) {
+    pdfium::ScopedSetInsertion<CPDF_Object*> insertion(pVisited, pCSObj);
+    return GetColorSpaceImpl(pArray->GetDirectObjectAt(0), pResources,
+                             pVisited);
+  }
+
+  CPDF_CountedColorSpace* csData = nullptr;
+  auto it = m_ColorSpaceMap.find(pCSObj);
+  if (it != m_ColorSpaceMap.end()) {
+    csData = it->second;
+    if (csData->get()) {
+      return csData->AddRef();
+    }
+  }
+
+  std::unique_ptr<CPDF_ColorSpace> pCS =
+      CPDF_ColorSpace::Load(m_pPDFDoc, pArray);
+  if (!pCS)
+    return nullptr;
+
+  if (!csData) {
+    csData = new CPDF_CountedColorSpace(pCS.release());
+    m_ColorSpaceMap[pCSObj] = csData;
+  } else {
+    csData->reset(pCS.release());
+  }
+  return csData->AddRef();
+}
+
+CPDF_ColorSpace* CPDF_DocPageData::GetCopiedColorSpace(CPDF_Object* pCSObj) {
+  if (!pCSObj)
+    return nullptr;
+
+  auto it = m_ColorSpaceMap.find(pCSObj);
+  if (it != m_ColorSpaceMap.end())
+    return it->second->AddRef();
+
+  return nullptr;
+}
+
+void CPDF_DocPageData::ReleaseColorSpace(const CPDF_Object* pColorSpace) {
+  if (!pColorSpace)
+    return;
+
+  auto it = m_ColorSpaceMap.find(pColorSpace);
+  if (it == m_ColorSpaceMap.end())
+    return;
+
+  CPDF_CountedColorSpace* pCountedColorSpace = it->second;
+  if (!pCountedColorSpace->get())
+    return;
+
+  pCountedColorSpace->RemoveRef();
+  if (pCountedColorSpace->use_count() > 1)
+    return;
+
+  // We have item only in m_ColorSpaceMap cache. Clean it.
+  pCountedColorSpace->get()->Release();
+  pCountedColorSpace->reset(nullptr);
+}
+
+CPDF_Pattern* CPDF_DocPageData::GetPattern(CPDF_Object* pPatternObj,
+                                           bool bShading,
+                                           const CFX_Matrix& matrix) {
+  if (!pPatternObj)
+    return nullptr;
+
+  CPDF_CountedPattern* ptData = nullptr;
+  auto it = m_PatternMap.find(pPatternObj);
+  if (it != m_PatternMap.end()) {
+    ptData = it->second;
+    if (ptData->get()) {
+      return ptData->AddRef();
+    }
+  }
+  CPDF_Pattern* pPattern = nullptr;
+  if (bShading) {
+    pPattern = new CPDF_ShadingPattern(m_pPDFDoc, pPatternObj, true, matrix);
+  } else {
+    CPDF_Dictionary* pDict = pPatternObj ? pPatternObj->GetDict() : nullptr;
+    if (pDict) {
+      int type = pDict->GetIntegerFor("PatternType");
+      if (type == CPDF_Pattern::TILING) {
+        pPattern = new CPDF_TilingPattern(m_pPDFDoc, pPatternObj, matrix);
+      } else if (type == CPDF_Pattern::SHADING) {
+        pPattern =
+            new CPDF_ShadingPattern(m_pPDFDoc, pPatternObj, false, matrix);
+      }
+    }
+  }
+  if (!pPattern)
+    return nullptr;
+
+  if (!ptData) {
+    ptData = new CPDF_CountedPattern(pPattern);
+    m_PatternMap[pPatternObj] = ptData;
+  } else {
+    ptData->reset(pPattern);
+  }
+  return ptData->AddRef();
+}
+
+void CPDF_DocPageData::ReleasePattern(const CPDF_Object* pPatternObj) {
+  if (!pPatternObj)
+    return;
+
+  auto it = m_PatternMap.find(pPatternObj);
+  if (it == m_PatternMap.end())
+    return;
+
+  CPDF_CountedPattern* pPattern = it->second;
+  if (!pPattern->get())
+    return;
+
+  pPattern->RemoveRef();
+  if (pPattern->use_count() > 1)
+    return;
+
+  // We have item only in m_PatternMap cache. Clean it.
+  pPattern->clear();
+}
+
+CPDF_Image* CPDF_DocPageData::GetImage(CPDF_Object* pImageStream) {
+  if (!pImageStream)
+    return nullptr;
+
+  const uint32_t dwImageObjNum = pImageStream->GetObjNum();
+  auto it = m_ImageMap.find(dwImageObjNum);
+  if (it != m_ImageMap.end())
+    return it->second->AddRef();
+
+  CPDF_CountedImage* pCountedImage = new CPDF_CountedImage(
+      new CPDF_Image(m_pPDFDoc, pImageStream->AsStream(), false));
+  m_ImageMap[dwImageObjNum] = pCountedImage;
+  return pCountedImage->AddRef();
+}
+
+void CPDF_DocPageData::ReleaseImage(const CPDF_Object* pImageStream) {
+  if (!pImageStream)
+    return;
+
+  uint32_t dwObjNum = pImageStream->GetObjNum();
+  if (!dwObjNum)
+    return;
+
+  auto it = m_ImageMap.find(dwObjNum);
+  if (it == m_ImageMap.end())
+    return;
+
+  CPDF_CountedImage* pCountedImage = it->second;
+  if (!pCountedImage)
+    return;
+
+  pCountedImage->RemoveRef();
+  if (pCountedImage->use_count() > 1)
+    return;
+
+  // We have item only in m_ImageMap cache. Clean it.
+  delete pCountedImage->get();
+  delete pCountedImage;
+  m_ImageMap.erase(it);
+}
+
+CPDF_IccProfile* CPDF_DocPageData::GetIccProfile(
+    CPDF_Stream* pIccProfileStream) {
+  if (!pIccProfileStream)
+    return nullptr;
+
+  auto it = m_IccProfileMap.find(pIccProfileStream);
+  if (it != m_IccProfileMap.end())
+    return it->second->AddRef();
+
+  CPDF_StreamAcc stream;
+  stream.LoadAllData(pIccProfileStream, FALSE);
+  uint8_t digest[20];
+  CRYPT_SHA1Generate(stream.GetData(), stream.GetSize(), digest);
+  CFX_ByteString bsDigest(digest, 20);
+  auto hash_it = m_HashProfileMap.find(bsDigest);
+  if (hash_it != m_HashProfileMap.end()) {
+    auto it_copied_stream = m_IccProfileMap.find(hash_it->second);
+    if (it_copied_stream != m_IccProfileMap.end())
+      return it_copied_stream->second->AddRef();
+  }
+  CPDF_IccProfile* pProfile =
+      new CPDF_IccProfile(stream.GetData(), stream.GetSize());
+  CPDF_CountedIccProfile* ipData = new CPDF_CountedIccProfile(pProfile);
+  m_IccProfileMap[pIccProfileStream] = ipData;
+  m_HashProfileMap[bsDigest] = pIccProfileStream;
+  return ipData->AddRef();
+}
+
+void CPDF_DocPageData::ReleaseIccProfile(const CPDF_IccProfile* pIccProfile) {
+  ASSERT(pIccProfile);
+
+  for (auto it = m_IccProfileMap.begin(); it != m_IccProfileMap.end(); ++it) {
+    CPDF_CountedIccProfile* profile = it->second;
+    if (profile->get() != pIccProfile)
+      continue;
+
+    profile->RemoveRef();
+    if (profile->use_count() > 1)
+      continue;
+    // We have item only in m_IccProfileMap cache. Clean it.
+    delete profile->get();
+    delete profile;
+    m_IccProfileMap.erase(it);
+    return;
+  }
+}
+
+CPDF_StreamAcc* CPDF_DocPageData::GetFontFileStreamAcc(
+    CPDF_Stream* pFontStream) {
+  ASSERT(pFontStream);
+
+  auto it = m_FontFileMap.find(pFontStream);
+  if (it != m_FontFileMap.end())
+    return it->second->AddRef();
+
+  CPDF_Dictionary* pFontDict = pFontStream->GetDict();
+  int32_t org_size = pFontDict->GetIntegerFor("Length1") +
+                     pFontDict->GetIntegerFor("Length2") +
+                     pFontDict->GetIntegerFor("Length3");
+  org_size = std::max(org_size, 0);
+
+  CPDF_StreamAcc* pFontFile = new CPDF_StreamAcc;
+  pFontFile->LoadAllData(pFontStream, FALSE, org_size);
+
+  CPDF_CountedStreamAcc* pCountedFont = new CPDF_CountedStreamAcc(pFontFile);
+  m_FontFileMap[pFontStream] = pCountedFont;
+  return pCountedFont->AddRef();
+}
+
+void CPDF_DocPageData::ReleaseFontFileStreamAcc(
+    const CPDF_Stream* pFontStream) {
+  if (!pFontStream)
+    return;
+
+  auto it = m_FontFileMap.find(pFontStream);
+  if (it == m_FontFileMap.end())
+    return;
+
+  CPDF_CountedStreamAcc* pCountedStream = it->second;
+  if (!pCountedStream)
+    return;
+
+  pCountedStream->RemoveRef();
+  if (pCountedStream->use_count() > 1)
+    return;
+
+  // We have item only in m_FontFileMap cache. Clean it.
+  delete pCountedStream->get();
+  delete pCountedStream;
+  m_FontFileMap.erase(it);
+}
+
+CPDF_CountedColorSpace* CPDF_DocPageData::FindColorSpacePtr(
+    CPDF_Object* pCSObj) const {
+  if (!pCSObj)
+    return nullptr;
+
+  auto it = m_ColorSpaceMap.find(pCSObj);
+  return it != m_ColorSpaceMap.end() ? it->second : nullptr;
+}
+
+CPDF_CountedPattern* CPDF_DocPageData::FindPatternPtr(
+    CPDF_Object* pPatternObj) const {
+  if (!pPatternObj)
+    return nullptr;
+
+  auto it = m_PatternMap.find(pPatternObj);
+  return it != m_PatternMap.end() ? it->second : nullptr;
+}