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// 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 <memory>
#include <set>
#include <utility>
#include "core/fdrm/crypto/fx_crypt.h"
#include "core/fpdfapi/cpdf_modulemgr.h"
#include "core/fpdfapi/font/cpdf_type1font.h"
#include "core/fpdfapi/page/cpdf_iccprofile.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_name.h"
#include "core/fpdfapi/parser/cpdf_stream_acc.h"
#include "third_party/base/stl_util.h"
CPDF_DocPageData::CPDF_DocPageData(CPDF_Document* pPDFDoc)
: m_bForceClear(false), m_pPDFDoc(pPDFDoc) {
assert(m_pPDFDoc);
}
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;
// This is needed because if |bForceRelease| is true we will destroy any
// pattern we see regardless of the ref-count. The tiling pattern owns a
// Form object which owns a ShadingObject. The ShadingObject has an unowned
// pointer to a ShadingPattern. The ShadingPattern is owned by the
// DocPageData. So, we loop through and clear any tiling patterns before we
// do the same for any shading patterns, otherwise we may free the
// ShadingPattern before the ShadingObject and trigger an unowned pointer
// probe warning.
for (auto& it : m_PatternMap) {
CPDF_CountedPattern* ptData = it.second;
if (!ptData->get() || !ptData->get()->AsTilingPattern())
continue;
if (bForceRelease || ptData->use_count() < 2)
ptData->clear();
}
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++;
if (bForceRelease || curr_it->second->HasOneRef()) {
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;
}
}
m_IccProfileMap.erase(curr_it);
}
}
for (auto it = m_FontFileMap.begin(); it != m_FontFileMap.end();) {
auto curr_it = it++;
if (bForceRelease || curr_it->second->HasOneRef())
m_FontFileMap.erase(curr_it);
}
m_ImageMap.clear();
}
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.Get(), pFontDict);
if (!pFont)
return nullptr;
if (pFontData) {
pFontData->reset(std::move(pFont));
} else {
pFontData = new CPDF_CountedFont(std::move(pFont));
m_FontMap[pFontDict] = pFontData;
}
return pFontData->AddRef();
}
CPDF_Font* CPDF_DocPageData::GetStandardFont(const 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 = m_pPDFDoc->NewIndirect<CPDF_Dictionary>();
pDict->SetNewFor<CPDF_Name>("Type", "Font");
pDict->SetNewFor<CPDF_Name>("Subtype", "Type1");
pDict->SetNewFor<CPDF_Name>("BaseFont", fontName);
if (pEncoding) {
pDict->SetFor("Encoding",
pEncoding->Realize(m_pPDFDoc->GetByteStringPool()));
}
std::unique_ptr<CPDF_Font> pFont = CPDF_Font::Create(m_pPDFDoc.Get(), pDict);
if (!pFont)
return nullptr;
CPDF_CountedFont* fontData = new CPDF_CountedFont(std::move(pFont));
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(
const CPDF_Object* pCSObj,
const CPDF_Dictionary* pResources) {
std::set<const CPDF_Object*> visited;
return GetColorSpaceGuarded(pCSObj, pResources, &visited);
}
CPDF_ColorSpace* CPDF_DocPageData::GetColorSpaceGuarded(
const CPDF_Object* pCSObj,
const CPDF_Dictionary* pResources,
std::set<const CPDF_Object*>* pVisited) {
std::set<const CPDF_Object*> visitedLocal;
return GetColorSpaceInternal(pCSObj, pResources, pVisited, &visitedLocal);
}
CPDF_ColorSpace* CPDF_DocPageData::GetColorSpaceInternal(
const CPDF_Object* pCSObj,
const CPDF_Dictionary* pResources,
std::set<const CPDF_Object*>* pVisited,
std::set<const CPDF_Object*>* pVisitedInternal) {
if (!pCSObj)
return nullptr;
if (pdfium::ContainsKey(*pVisitedInternal, pCSObj))
return nullptr;
pdfium::ScopedSetInsertion<const CPDF_Object*> insertion(pVisitedInternal,
pCSObj);
if (pCSObj->IsName()) {
ByteString name = pCSObj->GetString();
CPDF_ColorSpace* pCS = CPDF_ColorSpace::ColorspaceFromName(name);
if (!pCS && pResources) {
const CPDF_Dictionary* pList = pResources->GetDictFor("ColorSpace");
if (pList) {
return GetColorSpaceInternal(pList->GetDirectObjectFor(name), nullptr,
pVisited, pVisitedInternal);
}
}
if (!pCS || !pResources)
return pCS;
const CPDF_Dictionary* pColorSpaces = pResources->GetDictFor("ColorSpace");
if (!pColorSpaces)
return pCS;
const 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;
return GetColorSpaceInternal(pDefaultCS, nullptr, pVisited,
pVisitedInternal);
}
const CPDF_Array* pArray = pCSObj->AsArray();
if (!pArray || pArray->IsEmpty())
return nullptr;
if (pArray->GetCount() == 1) {
return GetColorSpaceInternal(pArray->GetDirectObjectAt(0), pResources,
pVisited, pVisitedInternal);
}
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.Get(), pArray, pVisited);
if (!pCS)
return nullptr;
if (csData) {
csData->reset(std::move(pCS));
} else {
csData = new CPDF_CountedColorSpace(std::move(pCS));
m_ColorSpaceMap[pCSObj] = csData;
}
return csData->AddRef();
}
CPDF_ColorSpace* CPDF_DocPageData::GetCopiedColorSpace(
const 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();
}
}
std::unique_ptr<CPDF_Pattern> pPattern;
if (bShading) {
pPattern = pdfium::MakeUnique<CPDF_ShadingPattern>(
m_pPDFDoc.Get(), pPatternObj, true, matrix);
} else {
CPDF_Dictionary* pDict = pPatternObj->GetDict();
if (!pDict)
return nullptr;
int type = pDict->GetIntegerFor("PatternType");
if (type == CPDF_Pattern::TILING) {
pPattern = pdfium::MakeUnique<CPDF_TilingPattern>(m_pPDFDoc.Get(),
pPatternObj, matrix);
} else if (type == CPDF_Pattern::SHADING) {
pPattern = pdfium::MakeUnique<CPDF_ShadingPattern>(
m_pPDFDoc.Get(), pPatternObj, false, matrix);
} else {
return nullptr;
}
}
if (ptData) {
ptData->reset(std::move(pPattern));
} else {
ptData = new CPDF_CountedPattern(std::move(pPattern));
m_PatternMap[pPatternObj] = ptData;
}
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();
}
RetainPtr<CPDF_Image> CPDF_DocPageData::GetImage(uint32_t dwStreamObjNum) {
ASSERT(dwStreamObjNum);
auto it = m_ImageMap.find(dwStreamObjNum);
if (it != m_ImageMap.end())
return it->second;
auto pImage = pdfium::MakeRetain<CPDF_Image>(m_pPDFDoc.Get(), dwStreamObjNum);
m_ImageMap[dwStreamObjNum] = pImage;
return pImage;
}
void CPDF_DocPageData::MaybePurgeImage(uint32_t dwStreamObjNum) {
ASSERT(dwStreamObjNum);
auto it = m_ImageMap.find(dwStreamObjNum);
if (it != m_ImageMap.end() && it->second->HasOneRef())
m_ImageMap.erase(it);
}
RetainPtr<CPDF_IccProfile> CPDF_DocPageData::GetIccProfile(
const CPDF_Stream* pProfileStream) {
if (!pProfileStream)
return nullptr;
auto it = m_IccProfileMap.find(pProfileStream);
if (it != m_IccProfileMap.end())
return it->second;
auto pAccessor = pdfium::MakeRetain<CPDF_StreamAcc>(pProfileStream);
pAccessor->LoadAllDataFiltered();
uint8_t digest[20];
CRYPT_SHA1Generate(pAccessor->GetData(), pAccessor->GetSize(), digest);
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;
}
auto pProfile = pdfium::MakeRetain<CPDF_IccProfile>(
pProfileStream, pAccessor->GetData(), pAccessor->GetSize());
m_IccProfileMap[pProfileStream] = pProfile;
m_HashProfileMap[bsDigest] = pProfileStream;
return pProfile;
}
void CPDF_DocPageData::MaybePurgeIccProfile(const CPDF_Stream* pProfileStream) {
ASSERT(pProfileStream);
auto it = m_IccProfileMap.find(pProfileStream);
if (it != m_IccProfileMap.end() && it->second->HasOneRef())
m_IccProfileMap.erase(it);
}
RetainPtr<CPDF_StreamAcc> CPDF_DocPageData::GetFontFileStreamAcc(
const CPDF_Stream* pFontStream) {
ASSERT(pFontStream);
auto it = m_FontFileMap.find(pFontStream);
if (it != m_FontFileMap.end())
return it->second;
const 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);
auto pFontAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pFontStream);
pFontAcc->LoadAllData(false, org_size, false);
m_FontFileMap[pFontStream] = pFontAcc;
return pFontAcc;
}
void CPDF_DocPageData::MaybePurgeFontFileStreamAcc(
const CPDF_Stream* pFontStream) {
if (!pFontStream)
return;
auto it = m_FontFileMap.find(pFontStream);
if (it != m_FontFileMap.end() && it->second->HasOneRef())
m_FontFileMap.erase(it);
}
CPDF_CountedColorSpace* CPDF_DocPageData::FindColorSpacePtr(
const 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(
const CPDF_Object* pPatternObj) const {
if (!pPatternObj)
return nullptr;
auto it = m_PatternMap.find(pPatternObj);
return it != m_PatternMap.end() ? it->second : nullptr;
}