Move fpdfsdk/src up to fpdfsdk/.

This CL moves the files in fpdfsdk/src/ up one level to fpdfsdk/ and fixes
up the include paths, include guards and build files.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1799773002 .

1 files changed, 1145 insertions, 0 deletions

diff --git a/fpdfsdk/fpdfview.cpp b/fpdfsdk/fpdfview.cpp
new file mode 100644
index 0000000000..48fe0664a2
--- /dev/null
+++ b/fpdfsdk/fpdfview.cpp
@@ -0,0 +1,1145 @@
+// 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 "public/fpdfview.h"
+
+#include <memory>
+
+#include "core/include/fpdfapi/cpdf_array.h"
+#include "core/include/fpdfapi/cpdf_document.h"
+#include "core/include/fxcodec/fx_codec.h"
+#include "core/include/fxcrt/fx_safe_types.h"
+#include "fpdfsdk/include/fsdk_define.h"
+#include "fpdfsdk/include/fsdk_mgr.h"
+#include "fpdfsdk/include/fsdk_rendercontext.h"
+#include "fpdfsdk/include/javascript/IJavaScript.h"
+#include "public/fpdf_ext.h"
+#include "public/fpdf_progressive.h"
+#include "third_party/base/numerics/safe_conversions_impl.h"
+
+#ifdef PDF_ENABLE_XFA
+#include "core/include/fpdfapi/fpdf_module.h"
+#include "fpdfsdk/include/fpdfxfa/fpdfxfa_app.h"
+#include "fpdfsdk/include/fpdfxfa/fpdfxfa_doc.h"
+#include "fpdfsdk/include/fpdfxfa/fpdfxfa_page.h"
+#include "fpdfsdk/include/fpdfxfa/fpdfxfa_util.h"
+#include "public/fpdf_formfill.h"
+#endif  // PDF_ENABLE_XFA
+
+UnderlyingDocumentType* UnderlyingFromFPDFDocument(FPDF_DOCUMENT doc) {
+  return static_cast<UnderlyingDocumentType*>(doc);
+}
+
+FPDF_DOCUMENT FPDFDocumentFromUnderlying(UnderlyingDocumentType* doc) {
+  return static_cast<FPDF_DOCUMENT>(doc);
+}
+
+UnderlyingPageType* UnderlyingFromFPDFPage(FPDF_PAGE page) {
+  return static_cast<UnderlyingPageType*>(page);
+}
+
+CPDF_Document* CPDFDocumentFromFPDFDocument(FPDF_DOCUMENT doc) {
+#ifdef PDF_ENABLE_XFA
+  return doc ? UnderlyingFromFPDFDocument(doc)->GetPDFDoc() : nullptr;
+#else   // PDF_ENABLE_XFA
+  return UnderlyingFromFPDFDocument(doc);
+#endif  // PDF_ENABLE_XFA
+}
+
+FPDF_DOCUMENT FPDFDocumentFromCPDFDocument(CPDF_Document* doc) {
+#ifdef PDF_ENABLE_XFA
+  return doc ? FPDFDocumentFromUnderlying(
+                   new CPDFXFA_Document(doc, CPDFXFA_App::GetInstance()))
+             : nullptr;
+#else   // PDF_ENABLE_XFA
+  return FPDFDocumentFromUnderlying(doc);
+#endif  // PDF_ENABLE_XFA
+}
+
+CPDF_Page* CPDFPageFromFPDFPage(FPDF_PAGE page) {
+#ifdef PDF_ENABLE_XFA
+  return page ? UnderlyingFromFPDFPage(page)->GetPDFPage() : nullptr;
+#else   // PDF_ENABLE_XFA
+  return UnderlyingFromFPDFPage(page);
+#endif  // PDF_ENABLE_XFA
+}
+
+#ifdef PDF_ENABLE_XFA
+CFPDF_FileStream::CFPDF_FileStream(FPDF_FILEHANDLER* pFS) {
+  m_pFS = pFS;
+  m_nCurPos = 0;
+}
+
+IFX_FileStream* CFPDF_FileStream::Retain() {
+  return this;
+}
+
+void CFPDF_FileStream::Release() {
+  if (m_pFS && m_pFS->Release)
+    m_pFS->Release(m_pFS->clientData);
+  delete this;
+}
+
+FX_FILESIZE CFPDF_FileStream::GetSize() {
+  if (m_pFS && m_pFS->GetSize)
+    return (FX_FILESIZE)m_pFS->GetSize(m_pFS->clientData);
+  return 0;
+}
+
+FX_BOOL CFPDF_FileStream::IsEOF() {
+  return m_nCurPos >= GetSize();
+}
+
+FX_BOOL CFPDF_FileStream::ReadBlock(void* buffer,
+                                    FX_FILESIZE offset,
+                                    size_t size) {
+  if (!buffer || !size || !m_pFS->ReadBlock)
+    return FALSE;
+
+  if (m_pFS->ReadBlock(m_pFS->clientData, (FPDF_DWORD)offset, buffer,
+                       (FPDF_DWORD)size) == 0) {
+    m_nCurPos = offset + size;
+    return TRUE;
+  }
+  return FALSE;
+}
+
+size_t CFPDF_FileStream::ReadBlock(void* buffer, size_t size) {
+  if (!buffer || !size || !m_pFS->ReadBlock)
+    return 0;
+
+  FX_FILESIZE nSize = GetSize();
+  if (m_nCurPos >= nSize)
+    return 0;
+  FX_FILESIZE dwAvail = nSize - m_nCurPos;
+  if (dwAvail < (FX_FILESIZE)size)
+    size = (size_t)dwAvail;
+  if (m_pFS->ReadBlock(m_pFS->clientData, (FPDF_DWORD)m_nCurPos, buffer,
+                       (FPDF_DWORD)size) == 0) {
+    m_nCurPos += size;
+    return size;
+  }
+
+  return 0;
+}
+
+FX_BOOL CFPDF_FileStream::WriteBlock(const void* buffer,
+                                     FX_FILESIZE offset,
+                                     size_t size) {
+  if (!m_pFS || !m_pFS->WriteBlock)
+    return FALSE;
+
+  if (m_pFS->WriteBlock(m_pFS->clientData, (FPDF_DWORD)offset, buffer,
+                        (FPDF_DWORD)size) == 0) {
+    m_nCurPos = offset + size;
+    return TRUE;
+  }
+  return FALSE;
+}
+
+FX_BOOL CFPDF_FileStream::Flush() {
+  if (!m_pFS || !m_pFS->Flush)
+    return TRUE;
+
+  return m_pFS->Flush(m_pFS->clientData) == 0;
+}
+#endif  // PDF_ENABLE_XFA
+
+CPDF_CustomAccess::CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess) {
+  m_FileAccess = *pFileAccess;
+#ifdef PDF_ENABLE_XFA
+  m_BufferOffset = (FX_DWORD)-1;
+#endif  // PDF_ENABLE_XFA
+}
+
+#ifdef PDF_ENABLE_XFA
+FX_BOOL CPDF_CustomAccess::GetByte(FX_DWORD pos, uint8_t& ch) {
+  if (pos >= m_FileAccess.m_FileLen)
+    return FALSE;
+  if (m_BufferOffset == (FX_DWORD)-1 || pos < m_BufferOffset ||
+      pos >= m_BufferOffset + 512) {
+    // Need to read from file access
+    m_BufferOffset = pos;
+    int size = 512;
+    if (pos + 512 > m_FileAccess.m_FileLen)
+      size = m_FileAccess.m_FileLen - pos;
+    if (!m_FileAccess.m_GetBlock(m_FileAccess.m_Param, m_BufferOffset, m_Buffer,
+                                 size))
+      return FALSE;
+  }
+  ch = m_Buffer[pos - m_BufferOffset];
+  return TRUE;
+}
+
+FX_BOOL CPDF_CustomAccess::GetBlock(FX_DWORD pos,
+                                    uint8_t* pBuf,
+                                    FX_DWORD size) {
+  if (pos + size > m_FileAccess.m_FileLen)
+    return FALSE;
+  return m_FileAccess.m_GetBlock(m_FileAccess.m_Param, pos, pBuf, size);
+}
+#endif  // PDF_ENABLE_XFA
+
+FX_BOOL CPDF_CustomAccess::ReadBlock(void* buffer,
+                                     FX_FILESIZE offset,
+                                     size_t size) {
+  if (offset < 0) {
+    return FALSE;
+  }
+  FX_SAFE_FILESIZE newPos =
+      pdfium::base::checked_cast<FX_FILESIZE, size_t>(size);
+  newPos += offset;
+  if (!newPos.IsValid() || newPos.ValueOrDie() > m_FileAccess.m_FileLen) {
+    return FALSE;
+  }
+  return m_FileAccess.m_GetBlock(m_FileAccess.m_Param, offset, (uint8_t*)buffer,
+                                 size);
+}
+
+// 0 bit: FPDF_POLICY_MACHINETIME_ACCESS
+static FX_DWORD foxit_sandbox_policy = 0xFFFFFFFF;
+
+void FSDK_SetSandBoxPolicy(FPDF_DWORD policy, FPDF_BOOL enable) {
+  switch (policy) {
+    case FPDF_POLICY_MACHINETIME_ACCESS: {
+      if (enable)
+        foxit_sandbox_policy |= 0x01;
+      else
+        foxit_sandbox_policy &= 0xFFFFFFFE;
+    } break;
+    default:
+      break;
+  }
+}
+
+FPDF_BOOL FSDK_IsSandBoxPolicyEnabled(FPDF_DWORD policy) {
+  switch (policy) {
+    case FPDF_POLICY_MACHINETIME_ACCESS:
+      return !!(foxit_sandbox_policy & 0x01);
+    default:
+      return FALSE;
+  }
+}
+
+CCodec_ModuleMgr* g_pCodecModule = nullptr;
+
+DLLEXPORT void STDCALL FPDF_InitLibrary() {
+  FPDF_InitLibraryWithConfig(nullptr);
+}
+
+DLLEXPORT void STDCALL
+FPDF_InitLibraryWithConfig(const FPDF_LIBRARY_CONFIG* cfg) {
+  g_pCodecModule = new CCodec_ModuleMgr();
+
+  CFX_GEModule::Create(cfg ? cfg->m_pUserFontPaths : nullptr);
+  CFX_GEModule::Get()->SetCodecModule(g_pCodecModule);
+
+  CPDF_ModuleMgr::Create();
+  CPDF_ModuleMgr* pModuleMgr = CPDF_ModuleMgr::Get();
+  pModuleMgr->SetCodecModule(g_pCodecModule);
+  pModuleMgr->InitPageModule();
+  pModuleMgr->InitRenderModule();
+#ifdef PDF_ENABLE_XFA
+  CPDFXFA_App::GetInstance()->Initialize(
+      (cfg && cfg->version >= 2)
+          ? reinterpret_cast<FXJSE_HRUNTIME>(cfg->m_pIsolate)
+          : nullptr);
+#else   // PDF_ENABLE_XFA
+  pModuleMgr->LoadEmbeddedGB1CMaps();
+  pModuleMgr->LoadEmbeddedJapan1CMaps();
+  pModuleMgr->LoadEmbeddedCNS1CMaps();
+  pModuleMgr->LoadEmbeddedKorea1CMaps();
+#endif  // PDF_ENABLE_XFA
+  if (cfg && cfg->version >= 2)
+    IJS_Runtime::Initialize(cfg->m_v8EmbedderSlot, cfg->m_pIsolate);
+}
+
+DLLEXPORT void STDCALL FPDF_DestroyLibrary() {
+#ifdef PDF_ENABLE_XFA
+  CPDFXFA_App::ReleaseInstance();
+#endif  // PDF_ENABLE_XFA
+  CPDF_ModuleMgr::Destroy();
+  CFX_GEModule::Destroy();
+
+  delete g_pCodecModule;
+  g_pCodecModule = nullptr;
+}
+
+#ifndef _WIN32
+int g_LastError;
+void SetLastError(int err) {
+  g_LastError = err;
+}
+
+int GetLastError() {
+  return g_LastError;
+}
+#endif  // _WIN32
+
+void ProcessParseError(CPDF_Parser::Error err) {
+  FX_DWORD err_code;
+  // Translate FPDFAPI error code to FPDFVIEW error code
+  switch (err) {
+    case CPDF_Parser::SUCCESS:
+      err_code = FPDF_ERR_SUCCESS;
+      break;
+    case CPDF_Parser::FILE_ERROR:
+      err_code = FPDF_ERR_FILE;
+      break;
+    case CPDF_Parser::FORMAT_ERROR:
+      err_code = FPDF_ERR_FORMAT;
+      break;
+    case CPDF_Parser::PASSWORD_ERROR:
+      err_code = FPDF_ERR_PASSWORD;
+      break;
+    case CPDF_Parser::HANDLER_ERROR:
+      err_code = FPDF_ERR_SECURITY;
+      break;
+  }
+  SetLastError(err_code);
+}
+
+DLLEXPORT void STDCALL FPDF_SetSandBoxPolicy(FPDF_DWORD policy,
+                                             FPDF_BOOL enable) {
+  return FSDK_SetSandBoxPolicy(policy, enable);
+}
+
+DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadDocument(FPDF_STRING file_path,
+                                                  FPDF_BYTESTRING password) {
+  // NOTE: the creation of the file needs to be by the embedder on the
+  // other side of this API.
+  IFX_FileRead* pFileAccess = FX_CreateFileRead((const FX_CHAR*)file_path);
+  if (!pFileAccess) {
+    return nullptr;
+  }
+
+  CPDF_Parser* pParser = new CPDF_Parser;
+  pParser->SetPassword(password);
+
+  CPDF_Parser::Error error = pParser->StartParse(pFileAccess);
+  if (error != CPDF_Parser::SUCCESS) {
+    delete pParser;
+    ProcessParseError(error);
+    return NULL;
+  }
+#ifdef PDF_ENABLE_XFA
+  CPDF_Document* pPDFDoc = pParser->GetDocument();
+  if (!pPDFDoc)
+    return NULL;
+
+  CPDFXFA_App* pProvider = CPDFXFA_App::GetInstance();
+  return new CPDFXFA_Document(pPDFDoc, pProvider);
+#else   // PDF_ENABLE_XFA
+  return pParser->GetDocument();
+#endif  // PDF_ENABLE_XFA
+}
+
+#ifdef PDF_ENABLE_XFA
+DLLEXPORT FPDF_BOOL STDCALL FPDF_HasXFAField(FPDF_DOCUMENT document,
+                                             int* docType) {
+  if (!document)
+    return FALSE;
+
+  CPDF_Document* pdfDoc =
+      (static_cast<CPDFXFA_Document*>(document))->GetPDFDoc();
+  if (!pdfDoc)
+    return FALSE;
+
+  CPDF_Dictionary* pRoot = pdfDoc->GetRoot();
+  if (!pRoot)
+    return FALSE;
+
+  CPDF_Dictionary* pAcroForm = pRoot->GetDictBy("AcroForm");
+  if (!pAcroForm)
+    return FALSE;
+
+  CPDF_Object* pXFA = pAcroForm->GetElement("XFA");
+  if (!pXFA)
+    return FALSE;
+
+  FX_BOOL bDynamicXFA = pRoot->GetBooleanBy("NeedsRendering", FALSE);
+
+  if (bDynamicXFA)
+    *docType = DOCTYPE_DYNAMIC_XFA;
+  else
+    *docType = DOCTYPE_STATIC_XFA;
+
+  return TRUE;
+}
+
+DLLEXPORT FPDF_BOOL STDCALL FPDF_LoadXFA(FPDF_DOCUMENT document) {
+  return document && (static_cast<CPDFXFA_Document*>(document))->LoadXFADoc();
+}
+#endif  // PDF_ENABLE_XFA
+
+class CMemFile final : public IFX_FileRead {
+ public:
+  CMemFile(uint8_t* pBuf, FX_FILESIZE size) : m_pBuf(pBuf), m_size(size) {}
+
+  void Release() override { delete this; }
+  FX_FILESIZE GetSize() override { return m_size; }
+  FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override {
+    if (offset < 0) {
+      return FALSE;
+    }
+    FX_SAFE_FILESIZE newPos =
+        pdfium::base::checked_cast<FX_FILESIZE, size_t>(size);
+    newPos += offset;
+    if (!newPos.IsValid() || newPos.ValueOrDie() > (FX_DWORD)m_size) {
+      return FALSE;
+    }
+    FXSYS_memcpy(buffer, m_pBuf + offset, size);
+    return TRUE;
+  }
+
+ private:
+  ~CMemFile() override {}
+
+  uint8_t* const m_pBuf;
+  const FX_FILESIZE m_size;
+};
+
+DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadMemDocument(const void* data_buf,
+                                                     int size,
+                                                     FPDF_BYTESTRING password) {
+  CPDF_Parser* pParser = new CPDF_Parser;
+  pParser->SetPassword(password);
+  CMemFile* pMemFile = new CMemFile((uint8_t*)data_buf, size);
+  CPDF_Parser::Error error = pParser->StartParse(pMemFile);
+  if (error != CPDF_Parser::SUCCESS) {
+    delete pParser;
+    ProcessParseError(error);
+    return NULL;
+  }
+  CPDF_Document* pDoc = NULL;
+  pDoc = pParser ? pParser->GetDocument() : NULL;
+  CheckUnSupportError(pDoc, error);
+  return FPDFDocumentFromCPDFDocument(pParser->GetDocument());
+}
+
+DLLEXPORT FPDF_DOCUMENT STDCALL
+FPDF_LoadCustomDocument(FPDF_FILEACCESS* pFileAccess,
+                        FPDF_BYTESTRING password) {
+  CPDF_Parser* pParser = new CPDF_Parser;
+  pParser->SetPassword(password);
+  CPDF_CustomAccess* pFile = new CPDF_CustomAccess(pFileAccess);
+  CPDF_Parser::Error error = pParser->StartParse(pFile);
+  if (error != CPDF_Parser::SUCCESS) {
+    delete pParser;
+    ProcessParseError(error);
+    return NULL;
+  }
+  CPDF_Document* pDoc = NULL;
+  pDoc = pParser ? pParser->GetDocument() : NULL;
+  CheckUnSupportError(pDoc, error);
+  return FPDFDocumentFromCPDFDocument(pParser->GetDocument());
+}
+
+DLLEXPORT FPDF_BOOL STDCALL FPDF_GetFileVersion(FPDF_DOCUMENT doc,
+                                                int* fileVersion) {
+  if (!fileVersion)
+    return FALSE;
+
+  *fileVersion = 0;
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(doc);
+  if (!pDoc)
+    return FALSE;
+
+  CPDF_Parser* pParser = pDoc->GetParser();
+  if (!pParser)
+    return FALSE;
+
+  *fileVersion = pParser->GetFileVersion();
+  return TRUE;
+}
+
+// jabdelmalek: changed return type from FX_DWORD to build on Linux (and match
+// header).
+DLLEXPORT unsigned long STDCALL FPDF_GetDocPermissions(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+#ifndef PDF_ENABLE_XFA
+    return 0;
+#else   // PDF_ENABLE_XFA
+    return (FX_DWORD)-1;
+#endif  // PDF_ENABLE_XFA
+
+  CPDF_Dictionary* pDict = pDoc->GetParser()->GetEncryptDict();
+  return pDict ? pDict->GetIntegerBy("P") : (FX_DWORD)-1;
+}
+
+DLLEXPORT int STDCALL FPDF_GetSecurityHandlerRevision(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return -1;
+
+  CPDF_Dictionary* pDict = pDoc->GetParser()->GetEncryptDict();
+  return pDict ? pDict->GetIntegerBy("R") : -1;
+}
+
+DLLEXPORT int STDCALL FPDF_GetPageCount(FPDF_DOCUMENT document) {
+  UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
+  return pDoc ? pDoc->GetPageCount() : 0;
+}
+
+DLLEXPORT FPDF_PAGE STDCALL FPDF_LoadPage(FPDF_DOCUMENT document,
+                                          int page_index) {
+  UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
+  if (!pDoc)
+    return nullptr;
+
+  if (page_index < 0 || page_index >= pDoc->GetPageCount())
+    return nullptr;
+
+#ifdef PDF_ENABLE_XFA
+  return pDoc->GetPage(page_index);
+#else   // PDF_ENABLE_XFA
+  CPDF_Dictionary* pDict = pDoc->GetPage(page_index);
+  if (!pDict)
+    return NULL;
+  CPDF_Page* pPage = new CPDF_Page;
+  pPage->Load(pDoc, pDict);
+  pPage->ParseContent(nullptr);
+  return pPage;
+#endif  // PDF_ENABLE_XFA
+}
+
+DLLEXPORT double STDCALL FPDF_GetPageWidth(FPDF_PAGE page) {
+  UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
+  return pPage ? pPage->GetPageWidth() : 0.0;
+}
+
+DLLEXPORT double STDCALL FPDF_GetPageHeight(FPDF_PAGE page) {
+  UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
+  return pPage ? pPage->GetPageHeight() : 0.0;
+}
+
+void DropContext(void* data) {
+  delete (CRenderContext*)data;
+}
+
+#if defined(_WIN32)
+DLLEXPORT void STDCALL FPDF_RenderPage(HDC dc,
+                                       FPDF_PAGE page,
+                                       int start_x,
+                                       int start_y,
+                                       int size_x,
+                                       int size_y,
+                                       int rotate,
+                                       int flags) {
+  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
+  if (!pPage)
+    return;
+
+  CRenderContext* pContext = new CRenderContext;
+  pPage->SetPrivateData((void*)1, pContext, DropContext);
+
+#if !defined(_WIN32_WCE)
+  CFX_DIBitmap* pBitmap = nullptr;
+  FX_BOOL bBackgroundAlphaNeeded = pPage->BackgroundAlphaNeeded();
+  FX_BOOL bHasImageMask = pPage->HasImageMask();
+  if (bBackgroundAlphaNeeded || bHasImageMask) {
+    pBitmap = new CFX_DIBitmap;
+    pBitmap->Create(size_x, size_y, FXDIB_Argb);
+    pBitmap->Clear(0x00ffffff);
+#ifdef _SKIA_SUPPORT_
+    pContext->m_pDevice = new CFX_SkiaDevice;
+    ((CFX_SkiaDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)pBitmap);
+#else
+    pContext->m_pDevice = new CFX_FxgeDevice;
+    ((CFX_FxgeDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)pBitmap);
+#endif
+  } else {
+    pContext->m_pDevice = new CFX_WindowsDevice(dc);
+  }
+
+  FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
+                         rotate, flags, TRUE, NULL);
+
+  if (bBackgroundAlphaNeeded || bHasImageMask) {
+    if (pBitmap) {
+      CFX_WindowsDevice WinDC(dc);
+
+      if (WinDC.GetDeviceCaps(FXDC_DEVICE_CLASS) == FXDC_PRINTER) {
+        CFX_DIBitmap* pDst = new CFX_DIBitmap;
+        int pitch = pBitmap->GetPitch();
+        pDst->Create(size_x, size_y, FXDIB_Rgb32);
+        FXSYS_memset(pDst->GetBuffer(), -1, pitch * size_y);
+        pDst->CompositeBitmap(0, 0, size_x, size_y, pBitmap, 0, 0,
+                              FXDIB_BLEND_NORMAL, NULL, FALSE, NULL);
+        WinDC.StretchDIBits(pDst, 0, 0, size_x, size_y);
+        delete pDst;
+      } else {
+        WinDC.SetDIBits(pBitmap, 0, 0);
+      }
+    }
+  }
+#else
+  // get clip region
+  RECT rect, cliprect;
+  rect.left = start_x;
+  rect.top = start_y;
+  rect.right = start_x + size_x;
+  rect.bottom = start_y + size_y;
+  GetClipBox(dc, &cliprect);
+  IntersectRect(&rect, &rect, &cliprect);
+  int width = rect.right - rect.left;
+  int height = rect.bottom - rect.top;
+
+  // Create a DIB section
+  LPVOID pBuffer;
+  BITMAPINFOHEADER bmih;
+  FXSYS_memset(&bmih, 0, sizeof bmih);
+  bmih.biSize = sizeof bmih;
+  bmih.biBitCount = 24;
+  bmih.biHeight = -height;
+  bmih.biPlanes = 1;
+  bmih.biWidth = width;
+  pContext->m_hBitmap = CreateDIBSection(dc, (BITMAPINFO*)&bmih, DIB_RGB_COLORS,
+                                         &pBuffer, NULL, 0);
+  FXSYS_memset(pBuffer, 0xff, height * ((width * 3 + 3) / 4 * 4));
+
+  // Create a device with this external buffer
+  pContext->m_pBitmap = new CFX_DIBitmap;
+  pContext->m_pBitmap->Create(width, height, FXDIB_Rgb, (uint8_t*)pBuffer);
+  pContext->m_pDevice = new CPDF_FxgeDevice;
+  ((CPDF_FxgeDevice*)pContext->m_pDevice)->Attach(pContext->m_pBitmap);
+
+  // output to bitmap device
+  FPDF_RenderPage_Retail(pContext, page, start_x - rect.left,
+                         start_y - rect.top, size_x, size_y, rotate, flags);
+
+  // Now output to real device
+  HDC hMemDC = CreateCompatibleDC(dc);
+  HGDIOBJ hOldBitmap = SelectObject(hMemDC, pContext->m_hBitmap);
+
+  BitBlt(dc, rect.left, rect.top, width, height, hMemDC, 0, 0, SRCCOPY);
+  SelectObject(hMemDC, hOldBitmap);
+  DeleteDC(hMemDC);
+
+#endif  // !defined(_WIN32_WCE)
+  if (bBackgroundAlphaNeeded || bHasImageMask)
+    delete pBitmap;
+
+  delete pContext;
+  pPage->RemovePrivateData((void*)1);
+}
+#endif  // defined(_WIN32)
+
+DLLEXPORT void STDCALL FPDF_RenderPageBitmap(FPDF_BITMAP bitmap,
+                                             FPDF_PAGE page,
+                                             int start_x,
+                                             int start_y,
+                                             int size_x,
+                                             int size_y,
+                                             int rotate,
+                                             int flags) {
+  if (!bitmap)
+    return;
+  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
+  if (!pPage)
+    return;
+  CRenderContext* pContext = new CRenderContext;
+  pPage->SetPrivateData((void*)1, pContext, DropContext);
+#ifdef _SKIA_SUPPORT_
+  pContext->m_pDevice = new CFX_SkiaDevice;
+
+  if (flags & FPDF_REVERSE_BYTE_ORDER)
+    ((CFX_SkiaDevice*)pContext->m_pDevice)
+        ->Attach((CFX_DIBitmap*)bitmap, 0, TRUE);
+  else
+    ((CFX_SkiaDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)bitmap);
+#else
+  pContext->m_pDevice = new CFX_FxgeDevice;
+
+  if (flags & FPDF_REVERSE_BYTE_ORDER)
+    ((CFX_FxgeDevice*)pContext->m_pDevice)
+        ->Attach((CFX_DIBitmap*)bitmap, 0, TRUE);
+  else
+    ((CFX_FxgeDevice*)pContext->m_pDevice)->Attach((CFX_DIBitmap*)bitmap);
+#endif
+
+  FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
+                         rotate, flags, TRUE, NULL);
+
+  delete pContext;
+  pPage->RemovePrivateData((void*)1);
+}
+
+DLLEXPORT void STDCALL FPDF_ClosePage(FPDF_PAGE page) {
+  if (!page)
+    return;
+#ifdef PDF_ENABLE_XFA
+  CPDFXFA_Page* pPage = (CPDFXFA_Page*)page;
+  pPage->Release();
+#else   // PDF_ENABLE_XFA
+  CPDFSDK_PageView* pPageView =
+      (CPDFSDK_PageView*)(((CPDF_Page*)page))->GetPrivateData((void*)page);
+  if (pPageView && pPageView->IsLocked()) {
+    pPageView->TakeOverPage();
+    return;
+  }
+  delete (CPDF_Page*)page;
+#endif  // PDF_ENABLE_XFA
+}
+
+DLLEXPORT void STDCALL FPDF_CloseDocument(FPDF_DOCUMENT document) {
+#ifdef PDF_ENABLE_XFA
+  delete UnderlyingFromFPDFDocument(document);
+#else   // PDF_ENABLE_XFA
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return;
+  CPDF_Parser* pParser = pDoc->GetParser();
+  if (!pParser) {
+    delete pDoc;
+    return;
+  }
+  delete pParser;
+#endif  // PDF_ENABLE_XFA
+}
+
+DLLEXPORT unsigned long STDCALL FPDF_GetLastError() {
+  return GetLastError();
+}
+
+DLLEXPORT void STDCALL FPDF_DeviceToPage(FPDF_PAGE page,
+                                         int start_x,
+                                         int start_y,
+                                         int size_x,
+                                         int size_y,
+                                         int rotate,
+                                         int device_x,
+                                         int device_y,
+                                         double* page_x,
+                                         double* page_y) {
+  if (!page || !page_x || !page_y)
+    return;
+  UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
+#ifdef PDF_ENABLE_XFA
+  pPage->DeviceToPage(start_x, start_y, size_x, size_y, rotate, device_x,
+                      device_y, page_x, page_y);
+#else   // PDF_ENABLE_XFA
+  CFX_Matrix page2device;
+  pPage->GetDisplayMatrix(page2device, start_x, start_y, size_x, size_y,
+                          rotate);
+  CFX_Matrix device2page;
+  device2page.SetReverse(page2device);
+  FX_FLOAT page_x_f, page_y_f;
+  device2page.Transform((FX_FLOAT)(device_x), (FX_FLOAT)(device_y), page_x_f,
+                        page_y_f);
+  *page_x = (page_x_f);
+  *page_y = (page_y_f);
+#endif  // PDF_ENABLE_XFA
+}
+
+DLLEXPORT void STDCALL FPDF_PageToDevice(FPDF_PAGE page,
+                                         int start_x,
+                                         int start_y,
+                                         int size_x,
+                                         int size_y,
+                                         int rotate,
+                                         double page_x,
+                                         double page_y,
+                                         int* device_x,
+                                         int* device_y) {
+  if (!device_x || !device_y)
+    return;
+  UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
+  if (!pPage)
+    return;
+#ifdef PDF_ENABLE_XFA
+  pPage->PageToDevice(start_x, start_y, size_x, size_y, rotate, page_x, page_y,
+                      device_x, device_y);
+#else   // PDF_ENABLE_XFA
+  CFX_Matrix page2device;
+  pPage->GetDisplayMatrix(page2device, start_x, start_y, size_x, size_y,
+                          rotate);
+  FX_FLOAT device_x_f, device_y_f;
+  page2device.Transform(((FX_FLOAT)page_x), ((FX_FLOAT)page_y), device_x_f,
+                        device_y_f);
+  *device_x = FXSYS_round(device_x_f);
+  *device_y = FXSYS_round(device_y_f);
+#endif  // PDF_ENABLE_XFA
+}
+
+DLLEXPORT FPDF_BITMAP STDCALL FPDFBitmap_Create(int width,
+                                                int height,
+                                                int alpha) {
+  std::unique_ptr<CFX_DIBitmap> pBitmap(new CFX_DIBitmap);
+  if (!pBitmap->Create(width, height, alpha ? FXDIB_Argb : FXDIB_Rgb32)) {
+    return NULL;
+  }
+  return pBitmap.release();
+}
+
+DLLEXPORT FPDF_BITMAP STDCALL FPDFBitmap_CreateEx(int width,
+                                                  int height,
+                                                  int format,
+                                                  void* first_scan,
+                                                  int stride) {
+  FXDIB_Format fx_format;
+  switch (format) {
+    case FPDFBitmap_Gray:
+      fx_format = FXDIB_8bppRgb;
+      break;
+    case FPDFBitmap_BGR:
+      fx_format = FXDIB_Rgb;
+      break;
+    case FPDFBitmap_BGRx:
+      fx_format = FXDIB_Rgb32;
+      break;
+    case FPDFBitmap_BGRA:
+      fx_format = FXDIB_Argb;
+      break;
+    default:
+      return NULL;
+  }
+  CFX_DIBitmap* pBitmap = new CFX_DIBitmap;
+  pBitmap->Create(width, height, fx_format, (uint8_t*)first_scan, stride);
+  return pBitmap;
+}
+
+DLLEXPORT void STDCALL FPDFBitmap_FillRect(FPDF_BITMAP bitmap,
+                                           int left,
+                                           int top,
+                                           int width,
+                                           int height,
+                                           FPDF_DWORD color) {
+  if (!bitmap)
+    return;
+#ifdef _SKIA_SUPPORT_
+  CFX_SkiaDevice device;
+#else
+  CFX_FxgeDevice device;
+#endif
+  device.Attach((CFX_DIBitmap*)bitmap);
+  if (!((CFX_DIBitmap*)bitmap)->HasAlpha())
+    color |= 0xFF000000;
+  FX_RECT rect(left, top, left + width, top + height);
+  device.FillRect(&rect, color);
+}
+
+DLLEXPORT void* STDCALL FPDFBitmap_GetBuffer(FPDF_BITMAP bitmap) {
+  return bitmap ? ((CFX_DIBitmap*)bitmap)->GetBuffer() : nullptr;
+}
+
+DLLEXPORT int STDCALL FPDFBitmap_GetWidth(FPDF_BITMAP bitmap) {
+  return bitmap ? ((CFX_DIBitmap*)bitmap)->GetWidth() : 0;
+}
+
+DLLEXPORT int STDCALL FPDFBitmap_GetHeight(FPDF_BITMAP bitmap) {
+  return bitmap ? ((CFX_DIBitmap*)bitmap)->GetHeight() : 0;
+}
+
+DLLEXPORT int STDCALL FPDFBitmap_GetStride(FPDF_BITMAP bitmap) {
+  return bitmap ? ((CFX_DIBitmap*)bitmap)->GetPitch() : 0;
+}
+
+DLLEXPORT void STDCALL FPDFBitmap_Destroy(FPDF_BITMAP bitmap) {
+  delete (CFX_DIBitmap*)bitmap;
+}
+
+void FPDF_RenderPage_Retail(CRenderContext* pContext,
+                            FPDF_PAGE page,
+                            int start_x,
+                            int start_y,
+                            int size_x,
+                            int size_y,
+                            int rotate,
+                            int flags,
+                            FX_BOOL bNeedToRestore,
+                            IFSDK_PAUSE_Adapter* pause) {
+  CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
+  if (!pPage)
+    return;
+
+  if (!pContext->m_pOptions)
+    pContext->m_pOptions = new CPDF_RenderOptions;
+
+  if (flags & FPDF_LCD_TEXT)
+    pContext->m_pOptions->m_Flags |= RENDER_CLEARTYPE;
+  else
+    pContext->m_pOptions->m_Flags &= ~RENDER_CLEARTYPE;
+  if (flags & FPDF_NO_NATIVETEXT)
+    pContext->m_pOptions->m_Flags |= RENDER_NO_NATIVETEXT;
+  if (flags & FPDF_RENDER_LIMITEDIMAGECACHE)
+    pContext->m_pOptions->m_Flags |= RENDER_LIMITEDIMAGECACHE;
+  if (flags & FPDF_RENDER_FORCEHALFTONE)
+    pContext->m_pOptions->m_Flags |= RENDER_FORCE_HALFTONE;
+#ifndef PDF_ENABLE_XFA
+  if (flags & FPDF_RENDER_NO_SMOOTHTEXT)
+    pContext->m_pOptions->m_Flags |= RENDER_NOTEXTSMOOTH;
+  if (flags & FPDF_RENDER_NO_SMOOTHIMAGE)
+    pContext->m_pOptions->m_Flags |= RENDER_NOIMAGESMOOTH;
+  if (flags & FPDF_RENDER_NO_SMOOTHPATH)
+    pContext->m_pOptions->m_Flags |= RENDER_NOPATHSMOOTH;
+#endif  // PDF_ENABLE_XFA
+  // Grayscale output
+  if (flags & FPDF_GRAYSCALE) {
+    pContext->m_pOptions->m_ColorMode = RENDER_COLOR_GRAY;
+    pContext->m_pOptions->m_ForeColor = 0;
+    pContext->m_pOptions->m_BackColor = 0xffffff;
+  }
+  const CPDF_OCContext::UsageType usage =
+      (flags & FPDF_PRINTING) ? CPDF_OCContext::Print : CPDF_OCContext::View;
+  pContext->m_pOptions->m_AddFlags = flags >> 8;
+  pContext->m_pOptions->m_pOCContext =
+      new CPDF_OCContext(pPage->m_pDocument, usage);
+
+  CFX_Matrix matrix;
+  pPage->GetDisplayMatrix(matrix, start_x, start_y, size_x, size_y, rotate);
+
+  pContext->m_pDevice->SaveState();
+  pContext->m_pDevice->SetClip_Rect(
+      FX_RECT(start_x, start_y, start_x + size_x, start_y + size_y));
+
+  pContext->m_pContext = new CPDF_RenderContext(pPage);
+  pContext->m_pContext->AppendLayer(pPage, &matrix);
+
+  if (flags & FPDF_ANNOT) {
+    pContext->m_pAnnots = new CPDF_AnnotList(pPage);
+    FX_BOOL bPrinting = pContext->m_pDevice->GetDeviceClass() != FXDC_DISPLAY;
+    pContext->m_pAnnots->DisplayAnnots(pPage, pContext->m_pContext, bPrinting,
+                                       &matrix, TRUE, NULL);
+  }
+
+  pContext->m_pRenderer = new CPDF_ProgressiveRenderer(
+      pContext->m_pContext, pContext->m_pDevice, pContext->m_pOptions);
+  pContext->m_pRenderer->Start(pause);
+  if (bNeedToRestore)
+    pContext->m_pDevice->RestoreState();
+}
+
+DLLEXPORT int STDCALL FPDF_GetPageSizeByIndex(FPDF_DOCUMENT document,
+                                              int page_index,
+                                              double* width,
+                                              double* height) {
+  UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
+  if (!pDoc)
+    return FALSE;
+
+#ifdef PDF_ENABLE_XFA
+  int count = pDoc->GetPageCount();
+  if (page_index < 0 || page_index >= count)
+    return FALSE;
+  CPDFXFA_Page* pPage = pDoc->GetPage(page_index);
+  if (!pPage)
+    return FALSE;
+  *width = pPage->GetPageWidth();
+  *height = pPage->GetPageHeight();
+#else   // PDF_ENABLE_XFA
+  CPDF_Dictionary* pDict = pDoc->GetPage(page_index);
+  if (!pDict)
+    return FALSE;
+  CPDF_Page page;
+  page.Load(pDoc, pDict);
+  *width = page.GetPageWidth();
+  *height = page.GetPageHeight();
+#endif  // PDF_ENABLE_XFA
+
+  return TRUE;
+}
+
+DLLEXPORT FPDF_BOOL STDCALL
+FPDF_VIEWERREF_GetPrintScaling(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return TRUE;
+  CPDF_ViewerPreferences viewRef(pDoc);
+  return viewRef.PrintScaling();
+}
+
+DLLEXPORT int STDCALL FPDF_VIEWERREF_GetNumCopies(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return 1;
+  CPDF_ViewerPreferences viewRef(pDoc);
+  return viewRef.NumCopies();
+}
+
+DLLEXPORT FPDF_PAGERANGE STDCALL
+FPDF_VIEWERREF_GetPrintPageRange(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return NULL;
+  CPDF_ViewerPreferences viewRef(pDoc);
+  return viewRef.PrintPageRange();
+}
+
+DLLEXPORT FPDF_DUPLEXTYPE STDCALL
+FPDF_VIEWERREF_GetDuplex(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return DuplexUndefined;
+  CPDF_ViewerPreferences viewRef(pDoc);
+  CFX_ByteString duplex = viewRef.Duplex();
+  if ("Simplex" == duplex)
+    return Simplex;
+  if ("DuplexFlipShortEdge" == duplex)
+    return DuplexFlipShortEdge;
+  if ("DuplexFlipLongEdge" == duplex)
+    return DuplexFlipLongEdge;
+  return DuplexUndefined;
+}
+
+DLLEXPORT FPDF_DWORD STDCALL FPDF_CountNamedDests(FPDF_DOCUMENT document) {
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return 0;
+
+  CPDF_Dictionary* pRoot = pDoc->GetRoot();
+  if (!pRoot)
+    return 0;
+
+  CPDF_NameTree nameTree(pDoc, "Dests");
+  pdfium::base::CheckedNumeric<FPDF_DWORD> count = nameTree.GetCount();
+  CPDF_Dictionary* pDest = pRoot->GetDictBy("Dests");
+  if (pDest)
+    count += pDest->GetCount();
+
+  if (!count.IsValid())
+    return 0;
+
+  return count.ValueOrDie();
+}
+
+DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDestByName(FPDF_DOCUMENT document,
+                                                    FPDF_BYTESTRING name) {
+  if (!name || name[0] == 0)
+    return nullptr;
+
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return nullptr;
+
+  CPDF_NameTree name_tree(pDoc, "Dests");
+  return name_tree.LookupNamedDest(pDoc, name);
+}
+
+#ifdef PDF_ENABLE_XFA
+FPDF_RESULT FPDF_BStr_Init(FPDF_BSTR* str) {
+  if (!str)
+    return -1;
+
+  FXSYS_memset(str, 0, sizeof(FPDF_BSTR));
+  return 0;
+}
+
+FPDF_RESULT FPDF_BStr_Set(FPDF_BSTR* str, FPDF_LPCSTR bstr, int length) {
+  if (!str)
+    return -1;
+  if (!bstr || !length)
+    return -1;
+  if (length == -1)
+    length = FXSYS_strlen(bstr);
+
+  if (length == 0) {
+    if (str->str) {
+      FX_Free(str->str);
+      str->str = NULL;
+    }
+    str->len = 0;
+    return 0;
+  }
+
+  if (str->str && str->len < length)
+    str->str = FX_Realloc(char, str->str, length + 1);
+  else if (!str->str)
+    str->str = FX_Alloc(char, length + 1);
+
+  str->str[length] = 0;
+  if (str->str == NULL)
+    return -1;
+
+  FXSYS_memcpy(str->str, bstr, length);
+  str->len = length;
+
+  return 0;
+}
+
+FPDF_RESULT FPDF_BStr_Clear(FPDF_BSTR* str) {
+  if (!str)
+    return -1;
+
+  if (str->str) {
+    FX_Free(str->str);
+    str->str = NULL;
+  }
+  str->len = 0;
+  return 0;
+}
+#endif  // PDF_ENABLE_XFA
+
+DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDest(FPDF_DOCUMENT document,
+                                              int index,
+                                              void* buffer,
+                                              long* buflen) {
+  if (!buffer)
+    *buflen = 0;
+
+  if (index < 0)
+    return nullptr;
+
+  CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
+  if (!pDoc)
+    return nullptr;
+
+  CPDF_Dictionary* pRoot = pDoc->GetRoot();
+  if (!pRoot)
+    return nullptr;
+
+  CPDF_Object* pDestObj = nullptr;
+  CFX_ByteString bsName;
+  CPDF_NameTree nameTree(pDoc, "Dests");
+  int count = nameTree.GetCount();
+  if (index >= count) {
+    CPDF_Dictionary* pDest = pRoot->GetDictBy("Dests");
+    if (!pDest)
+      return nullptr;
+
+    pdfium::base::CheckedNumeric<int> checked_count = count;
+    checked_count += pDest->GetCount();
+    if (!checked_count.IsValid() || index >= checked_count.ValueOrDie())
+      return nullptr;
+
+    index -= count;
+    int i = 0;
+    for (const auto& it : *pDest) {
+      bsName = it.first;
+      pDestObj = it.second;
+      if (!pDestObj)
+        continue;
+      if (i == index)
+        break;
+      i++;
+    }
+  } else {
+    pDestObj = nameTree.LookupValue(index, bsName);
+  }
+  if (!pDestObj)
+    return nullptr;
+  if (CPDF_Dictionary* pDict = pDestObj->AsDictionary()) {
+    pDestObj = pDict->GetArrayBy("D");
+    if (!pDestObj)
+      return nullptr;
+  }
+  if (!pDestObj->IsArray())
+    return nullptr;
+
+  CFX_WideString wsName = PDF_DecodeText(bsName);
+  CFX_ByteString utf16Name = wsName.UTF16LE_Encode();
+  unsigned int len = utf16Name.GetLength();
+  if (!buffer) {
+    *buflen = len;
+  } else if (*buflen >= len) {
+    memcpy(buffer, utf16Name.c_str(), len);
+    *buflen = len;
+  } else {
+    *buflen = -1;
+  }
+  return (FPDF_DEST)pDestObj;
+}