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      1 // Copyright 2014 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 "public/fpdfview.h"
      8 
      9 #include <memory>
     10 #include <utility>
     11 
     12 #include "core/fpdfapi/cpdf_modulemgr.h"
     13 #include "core/fpdfapi/cpdf_pagerendercontext.h"
     14 #include "core/fpdfapi/page/cpdf_page.h"
     15 #include "core/fpdfapi/parser/cpdf_array.h"
     16 #include "core/fpdfapi/parser/cpdf_document.h"
     17 #include "core/fpdfapi/parser/fpdf_parser_decode.h"
     18 #include "core/fpdfapi/render/cpdf_progressiverenderer.h"
     19 #include "core/fpdfapi/render/cpdf_renderoptions.h"
     20 #include "core/fpdfdoc/cpdf_annotlist.h"
     21 #include "core/fpdfdoc/cpdf_nametree.h"
     22 #include "core/fpdfdoc/cpdf_occontext.h"
     23 #include "core/fpdfdoc/cpdf_viewerpreferences.h"
     24 #include "core/fxcodec/fx_codec.h"
     25 #include "core/fxcrt/fx_memory.h"
     26 #include "core/fxcrt/fx_safe_types.h"
     27 #include "core/fxge/cfx_fxgedevice.h"
     28 #include "core/fxge/cfx_gemodule.h"
     29 #include "fpdfsdk/cpdfsdk_formfillenvironment.h"
     30 #include "fpdfsdk/cpdfsdk_pageview.h"
     31 #include "fpdfsdk/fsdk_define.h"
     32 #include "fpdfsdk/fsdk_pauseadapter.h"
     33 #include "fpdfsdk/javascript/ijs_runtime.h"
     34 #include "public/fpdf_ext.h"
     35 #include "public/fpdf_progressive.h"
     36 #include "third_party/base/numerics/safe_conversions_impl.h"
     37 #include "third_party/base/ptr_util.h"
     38 
     39 #ifdef PDF_ENABLE_XFA
     40 #include "fpdfsdk/fpdfxfa/cpdfxfa_context.h"
     41 #include "fpdfsdk/fpdfxfa/cpdfxfa_page.h"
     42 #include "fpdfsdk/fpdfxfa/cxfa_fwladaptertimermgr.h"
     43 #include "public/fpdf_formfill.h"
     44 #include "xfa/fxbarcode/BC_Library.h"
     45 #endif  // PDF_ENABLE_XFA
     46 
     47 #ifdef PDF_ENABLE_XFA_BMP
     48 #include "core/fxcodec/codec/ccodec_bmpmodule.h"
     49 #endif
     50 
     51 #ifdef PDF_ENABLE_XFA_GIF
     52 #include "core/fxcodec/codec/ccodec_gifmodule.h"
     53 #endif
     54 
     55 #ifdef PDF_ENABLE_XFA_PNG
     56 #include "core/fxcodec/codec/ccodec_pngmodule.h"
     57 #endif
     58 
     59 #ifdef PDF_ENABLE_XFA_TIFF
     60 #include "core/fxcodec/codec/ccodec_tiffmodule.h"
     61 #endif
     62 
     63 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
     64 #include "core/fxge/cfx_windowsdevice.h"
     65 #endif
     66 
     67 namespace {
     68 
     69 // Also indicates whether library is currently initialized.
     70 CCodec_ModuleMgr* g_pCodecModule = nullptr;
     71 
     72 void RenderPageImpl(CPDF_PageRenderContext* pContext,
     73                     CPDF_Page* pPage,
     74                     const CFX_Matrix& matrix,
     75                     const FX_RECT& clipping_rect,
     76                     int flags,
     77                     bool bNeedToRestore,
     78                     IFSDK_PAUSE_Adapter* pause) {
     79   if (!pContext->m_pOptions)
     80     pContext->m_pOptions = pdfium::MakeUnique<CPDF_RenderOptions>();
     81 
     82   if (flags & FPDF_LCD_TEXT)
     83     pContext->m_pOptions->m_Flags |= RENDER_CLEARTYPE;
     84   else
     85     pContext->m_pOptions->m_Flags &= ~RENDER_CLEARTYPE;
     86 
     87   if (flags & FPDF_NO_NATIVETEXT)
     88     pContext->m_pOptions->m_Flags |= RENDER_NO_NATIVETEXT;
     89   if (flags & FPDF_RENDER_LIMITEDIMAGECACHE)
     90     pContext->m_pOptions->m_Flags |= RENDER_LIMITEDIMAGECACHE;
     91   if (flags & FPDF_RENDER_FORCEHALFTONE)
     92     pContext->m_pOptions->m_Flags |= RENDER_FORCE_HALFTONE;
     93 #ifndef PDF_ENABLE_XFA
     94   if (flags & FPDF_RENDER_NO_SMOOTHTEXT)
     95     pContext->m_pOptions->m_Flags |= RENDER_NOTEXTSMOOTH;
     96   if (flags & FPDF_RENDER_NO_SMOOTHIMAGE)
     97     pContext->m_pOptions->m_Flags |= RENDER_NOIMAGESMOOTH;
     98   if (flags & FPDF_RENDER_NO_SMOOTHPATH)
     99     pContext->m_pOptions->m_Flags |= RENDER_NOPATHSMOOTH;
    100 #endif  // PDF_ENABLE_XFA
    101 
    102   // Grayscale output
    103   if (flags & FPDF_GRAYSCALE) {
    104     pContext->m_pOptions->m_ColorMode = RENDER_COLOR_GRAY;
    105     pContext->m_pOptions->m_ForeColor = 0;
    106     pContext->m_pOptions->m_BackColor = 0xffffff;
    107   }
    108 
    109   const CPDF_OCContext::UsageType usage =
    110       (flags & FPDF_PRINTING) ? CPDF_OCContext::Print : CPDF_OCContext::View;
    111   pContext->m_pOptions->m_AddFlags = flags >> 8;
    112   pContext->m_pOptions->m_pOCContext =
    113       pdfium::MakeRetain<CPDF_OCContext>(pPage->m_pDocument, usage);
    114 
    115   pContext->m_pDevice->SaveState();
    116   pContext->m_pDevice->SetClip_Rect(clipping_rect);
    117 
    118   pContext->m_pContext = pdfium::MakeUnique<CPDF_RenderContext>(pPage);
    119   pContext->m_pContext->AppendLayer(pPage, &matrix);
    120 
    121   if (flags & FPDF_ANNOT) {
    122     pContext->m_pAnnots = pdfium::MakeUnique<CPDF_AnnotList>(pPage);
    123     bool bPrinting = pContext->m_pDevice->GetDeviceClass() != FXDC_DISPLAY;
    124     pContext->m_pAnnots->DisplayAnnots(pPage, pContext->m_pContext.get(),
    125                                        bPrinting, &matrix, false, nullptr);
    126   }
    127 
    128   pContext->m_pRenderer = pdfium::MakeUnique<CPDF_ProgressiveRenderer>(
    129       pContext->m_pContext.get(), pContext->m_pDevice.get(),
    130       pContext->m_pOptions.get());
    131   pContext->m_pRenderer->Start(pause);
    132   if (bNeedToRestore)
    133     pContext->m_pDevice->RestoreState(false);
    134 }
    135 
    136 class CPDF_CustomAccess final : public IFX_SeekableReadStream {
    137  public:
    138   static CFX_RetainPtr<CPDF_CustomAccess> Create(FPDF_FILEACCESS* pFileAccess) {
    139     return CFX_RetainPtr<CPDF_CustomAccess>(new CPDF_CustomAccess(pFileAccess));
    140   }
    141 
    142   // IFX_SeekableReadStream
    143   FX_FILESIZE GetSize() override;
    144   bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
    145 
    146  private:
    147   explicit CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess);
    148 
    149   FPDF_FILEACCESS m_FileAccess;
    150 };
    151 
    152 CPDF_CustomAccess::CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess)
    153     : m_FileAccess(*pFileAccess) {}
    154 
    155 FX_FILESIZE CPDF_CustomAccess::GetSize() {
    156   return m_FileAccess.m_FileLen;
    157 }
    158 
    159 bool CPDF_CustomAccess::ReadBlock(void* buffer,
    160                                   FX_FILESIZE offset,
    161                                   size_t size) {
    162   if (offset < 0)
    163     return false;
    164 
    165   FX_SAFE_FILESIZE newPos = pdfium::base::checked_cast<FX_FILESIZE>(size);
    166   newPos += offset;
    167   if (!newPos.IsValid() ||
    168       newPos.ValueOrDie() > static_cast<FX_FILESIZE>(m_FileAccess.m_FileLen)) {
    169     return false;
    170   }
    171   return !!m_FileAccess.m_GetBlock(m_FileAccess.m_Param, offset,
    172                                    reinterpret_cast<uint8_t*>(buffer), size);
    173 }
    174 
    175 #ifdef PDF_ENABLE_XFA
    176 class CFPDF_FileStream : public IFX_SeekableStream {
    177  public:
    178   static CFX_RetainPtr<CFPDF_FileStream> Create(FPDF_FILEHANDLER* pFS) {
    179     return CFX_RetainPtr<CFPDF_FileStream>(new CFPDF_FileStream(pFS));
    180   }
    181   ~CFPDF_FileStream() override;
    182 
    183   // IFX_SeekableStream:
    184   FX_FILESIZE GetSize() override;
    185   bool IsEOF() override;
    186   FX_FILESIZE GetPosition() override;
    187   bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
    188   size_t ReadBlock(void* buffer, size_t size) override;
    189   bool WriteBlock(const void* buffer, FX_FILESIZE offset, size_t size) override;
    190   bool Flush() override;
    191 
    192   void SetPosition(FX_FILESIZE pos) { m_nCurPos = pos; }
    193 
    194  protected:
    195   explicit CFPDF_FileStream(FPDF_FILEHANDLER* pFS);
    196 
    197   FPDF_FILEHANDLER* m_pFS;
    198   FX_FILESIZE m_nCurPos;
    199 };
    200 
    201 CFPDF_FileStream::CFPDF_FileStream(FPDF_FILEHANDLER* pFS) {
    202   m_pFS = pFS;
    203   m_nCurPos = 0;
    204 }
    205 
    206 CFPDF_FileStream::~CFPDF_FileStream() {
    207   if (m_pFS && m_pFS->Release)
    208     m_pFS->Release(m_pFS->clientData);
    209 }
    210 
    211 FX_FILESIZE CFPDF_FileStream::GetSize() {
    212   if (m_pFS && m_pFS->GetSize)
    213     return (FX_FILESIZE)m_pFS->GetSize(m_pFS->clientData);
    214   return 0;
    215 }
    216 
    217 bool CFPDF_FileStream::IsEOF() {
    218   return m_nCurPos >= GetSize();
    219 }
    220 
    221 FX_FILESIZE CFPDF_FileStream::GetPosition() {
    222   return m_nCurPos;
    223 }
    224 
    225 bool CFPDF_FileStream::ReadBlock(void* buffer,
    226                                  FX_FILESIZE offset,
    227                                  size_t size) {
    228   if (!buffer || !size || !m_pFS->ReadBlock)
    229     return false;
    230 
    231   if (m_pFS->ReadBlock(m_pFS->clientData, (FPDF_DWORD)offset, buffer,
    232                        (FPDF_DWORD)size) == 0) {
    233     m_nCurPos = offset + size;
    234     return true;
    235   }
    236   return false;
    237 }
    238 
    239 size_t CFPDF_FileStream::ReadBlock(void* buffer, size_t size) {
    240   if (!buffer || !size || !m_pFS->ReadBlock)
    241     return 0;
    242 
    243   FX_FILESIZE nSize = GetSize();
    244   if (m_nCurPos >= nSize)
    245     return 0;
    246   FX_FILESIZE dwAvail = nSize - m_nCurPos;
    247   if (dwAvail < (FX_FILESIZE)size)
    248     size = (size_t)dwAvail;
    249   if (m_pFS->ReadBlock(m_pFS->clientData, (FPDF_DWORD)m_nCurPos, buffer,
    250                        (FPDF_DWORD)size) == 0) {
    251     m_nCurPos += size;
    252     return size;
    253   }
    254 
    255   return 0;
    256 }
    257 
    258 bool CFPDF_FileStream::WriteBlock(const void* buffer,
    259                                   FX_FILESIZE offset,
    260                                   size_t size) {
    261   if (!m_pFS || !m_pFS->WriteBlock)
    262     return false;
    263 
    264   if (m_pFS->WriteBlock(m_pFS->clientData, (FPDF_DWORD)offset, buffer,
    265                         (FPDF_DWORD)size) == 0) {
    266     m_nCurPos = offset + size;
    267     return true;
    268   }
    269   return false;
    270 }
    271 
    272 bool CFPDF_FileStream::Flush() {
    273   if (!m_pFS || !m_pFS->Flush)
    274     return true;
    275 
    276   return m_pFS->Flush(m_pFS->clientData) == 0;
    277 }
    278 #endif  // PDF_ENABLE_XFA
    279 
    280 }  // namespace
    281 
    282 UnderlyingDocumentType* UnderlyingFromFPDFDocument(FPDF_DOCUMENT doc) {
    283   return static_cast<UnderlyingDocumentType*>(doc);
    284 }
    285 
    286 FPDF_DOCUMENT FPDFDocumentFromUnderlying(UnderlyingDocumentType* doc) {
    287   return static_cast<FPDF_DOCUMENT>(doc);
    288 }
    289 
    290 UnderlyingPageType* UnderlyingFromFPDFPage(FPDF_PAGE page) {
    291   return static_cast<UnderlyingPageType*>(page);
    292 }
    293 
    294 CPDF_Document* CPDFDocumentFromFPDFDocument(FPDF_DOCUMENT doc) {
    295 #ifdef PDF_ENABLE_XFA
    296   return doc ? UnderlyingFromFPDFDocument(doc)->GetPDFDoc() : nullptr;
    297 #else   // PDF_ENABLE_XFA
    298   return UnderlyingFromFPDFDocument(doc);
    299 #endif  // PDF_ENABLE_XFA
    300 }
    301 
    302 FPDF_DOCUMENT FPDFDocumentFromCPDFDocument(CPDF_Document* doc) {
    303 #ifdef PDF_ENABLE_XFA
    304   return doc ? FPDFDocumentFromUnderlying(
    305                    new CPDFXFA_Context(pdfium::WrapUnique(doc)))
    306              : nullptr;
    307 #else   // PDF_ENABLE_XFA
    308   return FPDFDocumentFromUnderlying(doc);
    309 #endif  // PDF_ENABLE_XFA
    310 }
    311 
    312 CPDF_Page* CPDFPageFromFPDFPage(FPDF_PAGE page) {
    313 #ifdef PDF_ENABLE_XFA
    314   return page ? UnderlyingFromFPDFPage(page)->GetPDFPage() : nullptr;
    315 #else   // PDF_ENABLE_XFA
    316   return UnderlyingFromFPDFPage(page);
    317 #endif  // PDF_ENABLE_XFA
    318 }
    319 
    320 CFX_DIBitmap* CFXBitmapFromFPDFBitmap(FPDF_BITMAP bitmap) {
    321   return static_cast<CFX_DIBitmap*>(bitmap);
    322 }
    323 
    324 CFX_RetainPtr<IFX_SeekableReadStream> MakeSeekableReadStream(
    325     FPDF_FILEACCESS* pFileAccess) {
    326   return CPDF_CustomAccess::Create(pFileAccess);
    327 }
    328 
    329 #ifdef PDF_ENABLE_XFA
    330 CFX_RetainPtr<IFX_SeekableStream> MakeSeekableStream(
    331     FPDF_FILEHANDLER* pFilehandler) {
    332   return CFPDF_FileStream::Create(pFilehandler);
    333 }
    334 #endif  // PDF_ENABLE_XFA
    335 
    336 // 0 bit: FPDF_POLICY_MACHINETIME_ACCESS
    337 static uint32_t foxit_sandbox_policy = 0xFFFFFFFF;
    338 
    339 void FSDK_SetSandBoxPolicy(FPDF_DWORD policy, FPDF_BOOL enable) {
    340   switch (policy) {
    341     case FPDF_POLICY_MACHINETIME_ACCESS: {
    342       if (enable)
    343         foxit_sandbox_policy |= 0x01;
    344       else
    345         foxit_sandbox_policy &= 0xFFFFFFFE;
    346     } break;
    347     default:
    348       break;
    349   }
    350 }
    351 
    352 FPDF_BOOL FSDK_IsSandBoxPolicyEnabled(FPDF_DWORD policy) {
    353   switch (policy) {
    354     case FPDF_POLICY_MACHINETIME_ACCESS:
    355       return !!(foxit_sandbox_policy & 0x01);
    356     default:
    357       return false;
    358   }
    359 }
    360 
    361 DLLEXPORT void STDCALL FPDF_InitLibrary() {
    362   FPDF_InitLibraryWithConfig(nullptr);
    363 }
    364 
    365 DLLEXPORT void STDCALL
    366 FPDF_InitLibraryWithConfig(const FPDF_LIBRARY_CONFIG* cfg) {
    367   if (g_pCodecModule)
    368     return;
    369 
    370   g_pCodecModule = new CCodec_ModuleMgr();
    371 
    372   CFX_GEModule* pModule = CFX_GEModule::Get();
    373   pModule->Init(cfg ? cfg->m_pUserFontPaths : nullptr, g_pCodecModule);
    374 
    375   CPDF_ModuleMgr* pModuleMgr = CPDF_ModuleMgr::Get();
    376   pModuleMgr->SetCodecModule(g_pCodecModule);
    377   pModuleMgr->InitPageModule();
    378   pModuleMgr->LoadEmbeddedGB1CMaps();
    379   pModuleMgr->LoadEmbeddedJapan1CMaps();
    380   pModuleMgr->LoadEmbeddedCNS1CMaps();
    381   pModuleMgr->LoadEmbeddedKorea1CMaps();
    382 
    383 #ifdef PDF_ENABLE_XFA_BMP
    384   pModuleMgr->GetCodecModule()->SetBmpModule(
    385       pdfium::MakeUnique<CCodec_BmpModule>());
    386 #endif
    387 
    388 #ifdef PDF_ENABLE_XFA_GIF
    389   pModuleMgr->GetCodecModule()->SetGifModule(
    390       pdfium::MakeUnique<CCodec_GifModule>());
    391 #endif
    392 
    393 #ifdef PDF_ENABLE_XFA_PNG
    394   pModuleMgr->GetCodecModule()->SetPngModule(
    395       pdfium::MakeUnique<CCodec_PngModule>());
    396 #endif
    397 
    398 #ifdef PDF_ENABLE_XFA_TIFF
    399   pModuleMgr->GetCodecModule()->SetTiffModule(
    400       pdfium::MakeUnique<CCodec_TiffModule>());
    401 #endif
    402 
    403 #ifdef PDF_ENABLE_XFA
    404   FXJSE_Initialize();
    405   BC_Library_Init();
    406 #endif  // PDF_ENABLE_XFA
    407   if (cfg && cfg->version >= 2)
    408     IJS_Runtime::Initialize(cfg->m_v8EmbedderSlot, cfg->m_pIsolate);
    409 }
    410 
    411 DLLEXPORT void STDCALL FPDF_DestroyLibrary() {
    412   if (!g_pCodecModule)
    413     return;
    414 
    415 #ifdef PDF_ENABLE_XFA
    416   BC_Library_Destory();
    417   FXJSE_Finalize();
    418 #endif  // PDF_ENABLE_XFA
    419 
    420   CPDF_ModuleMgr::Destroy();
    421   CFX_GEModule::Destroy();
    422 
    423   delete g_pCodecModule;
    424   g_pCodecModule = nullptr;
    425 
    426   IJS_Runtime::Destroy();
    427 }
    428 
    429 #ifndef _WIN32
    430 int g_LastError;
    431 void SetLastError(int err) {
    432   g_LastError = err;
    433 }
    434 
    435 int GetLastError() {
    436   return g_LastError;
    437 }
    438 #endif  // _WIN32
    439 
    440 void ProcessParseError(CPDF_Parser::Error err) {
    441   uint32_t err_code = FPDF_ERR_SUCCESS;
    442   // Translate FPDFAPI error code to FPDFVIEW error code
    443   switch (err) {
    444     case CPDF_Parser::SUCCESS:
    445       err_code = FPDF_ERR_SUCCESS;
    446       break;
    447     case CPDF_Parser::FILE_ERROR:
    448       err_code = FPDF_ERR_FILE;
    449       break;
    450     case CPDF_Parser::FORMAT_ERROR:
    451       err_code = FPDF_ERR_FORMAT;
    452       break;
    453     case CPDF_Parser::PASSWORD_ERROR:
    454       err_code = FPDF_ERR_PASSWORD;
    455       break;
    456     case CPDF_Parser::HANDLER_ERROR:
    457       err_code = FPDF_ERR_SECURITY;
    458       break;
    459   }
    460   SetLastError(err_code);
    461 }
    462 
    463 DLLEXPORT void STDCALL FPDF_SetSandBoxPolicy(FPDF_DWORD policy,
    464                                              FPDF_BOOL enable) {
    465   return FSDK_SetSandBoxPolicy(policy, enable);
    466 }
    467 
    468 #if defined(_WIN32)
    469 #if defined(PDFIUM_PRINT_TEXT_WITH_GDI)
    470 DLLEXPORT void STDCALL
    471 FPDF_SetTypefaceAccessibleFunc(PDFiumEnsureTypefaceCharactersAccessible func) {
    472   g_pdfium_typeface_accessible_func = func;
    473 }
    474 
    475 DLLEXPORT void STDCALL FPDF_SetPrintTextWithGDI(FPDF_BOOL use_gdi) {
    476   g_pdfium_print_text_with_gdi = !!use_gdi;
    477 }
    478 #endif  // PDFIUM_PRINT_TEXT_WITH_GDI
    479 
    480 DLLEXPORT FPDF_BOOL STDCALL FPDF_SetPrintPostscriptLevel(int postscript_level) {
    481   if (postscript_level != 0 && postscript_level != 2 && postscript_level != 3)
    482     return FALSE;
    483   g_pdfium_print_postscript_level = postscript_level;
    484   return TRUE;
    485 }
    486 #endif  // defined(_WIN32)
    487 
    488 DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadDocument(FPDF_STRING file_path,
    489                                                   FPDF_BYTESTRING password) {
    490   // NOTE: the creation of the file needs to be by the embedder on the
    491   // other side of this API.
    492   CFX_RetainPtr<IFX_SeekableReadStream> pFileAccess =
    493       IFX_SeekableReadStream::CreateFromFilename((const FX_CHAR*)file_path);
    494   if (!pFileAccess)
    495     return nullptr;
    496 
    497   auto pParser = pdfium::MakeUnique<CPDF_Parser>();
    498   pParser->SetPassword(password);
    499 
    500   auto pDocument = pdfium::MakeUnique<CPDF_Document>(std::move(pParser));
    501   CPDF_Parser::Error error =
    502       pDocument->GetParser()->StartParse(pFileAccess, pDocument.get());
    503   if (error != CPDF_Parser::SUCCESS) {
    504     ProcessParseError(error);
    505     return nullptr;
    506   }
    507   return FPDFDocumentFromCPDFDocument(pDocument.release());
    508 }
    509 
    510 #ifdef PDF_ENABLE_XFA
    511 DLLEXPORT FPDF_BOOL STDCALL FPDF_HasXFAField(FPDF_DOCUMENT document,
    512                                              int* docType) {
    513   if (!document)
    514     return false;
    515 
    516   CPDF_Document* pdfDoc =
    517       (static_cast<CPDFXFA_Context*>(document))->GetPDFDoc();
    518   if (!pdfDoc)
    519     return false;
    520 
    521   CPDF_Dictionary* pRoot = pdfDoc->GetRoot();
    522   if (!pRoot)
    523     return false;
    524 
    525   CPDF_Dictionary* pAcroForm = pRoot->GetDictFor("AcroForm");
    526   if (!pAcroForm)
    527     return false;
    528 
    529   CPDF_Object* pXFA = pAcroForm->GetObjectFor("XFA");
    530   if (!pXFA)
    531     return false;
    532 
    533   bool bDynamicXFA = pRoot->GetBooleanFor("NeedsRendering", false);
    534   *docType = bDynamicXFA ? DOCTYPE_DYNAMIC_XFA : DOCTYPE_STATIC_XFA;
    535   return true;
    536 }
    537 
    538 DLLEXPORT FPDF_BOOL STDCALL FPDF_LoadXFA(FPDF_DOCUMENT document) {
    539   return document && (static_cast<CPDFXFA_Context*>(document))->LoadXFADoc();
    540 }
    541 #endif  // PDF_ENABLE_XFA
    542 
    543 class CMemFile final : public IFX_SeekableReadStream {
    544  public:
    545   static CFX_RetainPtr<CMemFile> Create(uint8_t* pBuf, FX_FILESIZE size) {
    546     return CFX_RetainPtr<CMemFile>(new CMemFile(pBuf, size));
    547   }
    548 
    549   FX_FILESIZE GetSize() override { return m_size; }
    550   bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override {
    551     if (offset < 0)
    552       return false;
    553 
    554     FX_SAFE_FILESIZE newPos = pdfium::base::checked_cast<FX_FILESIZE>(size);
    555     newPos += offset;
    556     if (!newPos.IsValid() || newPos.ValueOrDie() > m_size)
    557       return false;
    558 
    559     FXSYS_memcpy(buffer, m_pBuf + offset, size);
    560     return true;
    561   }
    562 
    563  private:
    564   CMemFile(uint8_t* pBuf, FX_FILESIZE size) : m_pBuf(pBuf), m_size(size) {}
    565 
    566   uint8_t* const m_pBuf;
    567   const FX_FILESIZE m_size;
    568 };
    569 
    570 DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadMemDocument(const void* data_buf,
    571                                                      int size,
    572                                                      FPDF_BYTESTRING password) {
    573   CFX_RetainPtr<CMemFile> pMemFile = CMemFile::Create((uint8_t*)data_buf, size);
    574   auto pParser = pdfium::MakeUnique<CPDF_Parser>();
    575   pParser->SetPassword(password);
    576 
    577   auto pDocument = pdfium::MakeUnique<CPDF_Document>(std::move(pParser));
    578   CPDF_Parser::Error error =
    579       pDocument->GetParser()->StartParse(pMemFile, pDocument.get());
    580   if (error != CPDF_Parser::SUCCESS) {
    581     ProcessParseError(error);
    582     return nullptr;
    583   }
    584   CheckUnSupportError(pDocument.get(), error);
    585   return FPDFDocumentFromCPDFDocument(pDocument.release());
    586 }
    587 
    588 DLLEXPORT FPDF_DOCUMENT STDCALL
    589 FPDF_LoadCustomDocument(FPDF_FILEACCESS* pFileAccess,
    590                         FPDF_BYTESTRING password) {
    591   CFX_RetainPtr<CPDF_CustomAccess> pFile =
    592       CPDF_CustomAccess::Create(pFileAccess);
    593   auto pParser = pdfium::MakeUnique<CPDF_Parser>();
    594   pParser->SetPassword(password);
    595 
    596   auto pDocument = pdfium::MakeUnique<CPDF_Document>(std::move(pParser));
    597   CPDF_Parser::Error error =
    598       pDocument->GetParser()->StartParse(pFile, pDocument.get());
    599   if (error != CPDF_Parser::SUCCESS) {
    600     ProcessParseError(error);
    601     return nullptr;
    602   }
    603   CheckUnSupportError(pDocument.get(), error);
    604   return FPDFDocumentFromCPDFDocument(pDocument.release());
    605 }
    606 
    607 DLLEXPORT FPDF_BOOL STDCALL FPDF_GetFileVersion(FPDF_DOCUMENT doc,
    608                                                 int* fileVersion) {
    609   if (!fileVersion)
    610     return false;
    611 
    612   *fileVersion = 0;
    613   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(doc);
    614   if (!pDoc)
    615     return false;
    616 
    617   CPDF_Parser* pParser = pDoc->GetParser();
    618   if (!pParser)
    619     return false;
    620 
    621   *fileVersion = pParser->GetFileVersion();
    622   return true;
    623 }
    624 
    625 // jabdelmalek: changed return type from uint32_t to build on Linux (and match
    626 // header).
    627 DLLEXPORT unsigned long STDCALL FPDF_GetDocPermissions(FPDF_DOCUMENT document) {
    628   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
    629   // https://bugs.chromium.org/p/pdfium/issues/detail?id=499
    630   if (!pDoc) {
    631 #ifndef PDF_ENABLE_XFA
    632     return 0;
    633 #else   // PDF_ENABLE_XFA
    634     return 0xFFFFFFFF;
    635 #endif  // PDF_ENABLE_XFA
    636   }
    637 
    638   return pDoc->GetUserPermissions();
    639 }
    640 
    641 DLLEXPORT int STDCALL FPDF_GetSecurityHandlerRevision(FPDF_DOCUMENT document) {
    642   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
    643   if (!pDoc || !pDoc->GetParser())
    644     return -1;
    645 
    646   CPDF_Dictionary* pDict = pDoc->GetParser()->GetEncryptDict();
    647   return pDict ? pDict->GetIntegerFor("R") : -1;
    648 }
    649 
    650 DLLEXPORT int STDCALL FPDF_GetPageCount(FPDF_DOCUMENT document) {
    651   UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
    652   return pDoc ? pDoc->GetPageCount() : 0;
    653 }
    654 
    655 DLLEXPORT FPDF_PAGE STDCALL FPDF_LoadPage(FPDF_DOCUMENT document,
    656                                           int page_index) {
    657   UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
    658   if (!pDoc)
    659     return nullptr;
    660 
    661   if (page_index < 0 || page_index >= pDoc->GetPageCount())
    662     return nullptr;
    663 
    664 #ifdef PDF_ENABLE_XFA
    665   return pDoc->GetXFAPage(page_index);
    666 #else   // PDF_ENABLE_XFA
    667   CPDF_Dictionary* pDict = pDoc->GetPage(page_index);
    668   if (!pDict)
    669     return nullptr;
    670 
    671   CPDF_Page* pPage = new CPDF_Page(pDoc, pDict, true);
    672   pPage->ParseContent();
    673   return pPage;
    674 #endif  // PDF_ENABLE_XFA
    675 }
    676 
    677 DLLEXPORT double STDCALL FPDF_GetPageWidth(FPDF_PAGE page) {
    678   UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
    679   return pPage ? pPage->GetPageWidth() : 0.0;
    680 }
    681 
    682 DLLEXPORT double STDCALL FPDF_GetPageHeight(FPDF_PAGE page) {
    683   UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
    684   return pPage ? pPage->GetPageHeight() : 0.0;
    685 }
    686 
    687 #if defined(_WIN32)
    688 DLLEXPORT void STDCALL FPDF_RenderPage(HDC dc,
    689                                        FPDF_PAGE page,
    690                                        int start_x,
    691                                        int start_y,
    692                                        int size_x,
    693                                        int size_y,
    694                                        int rotate,
    695                                        int flags) {
    696   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
    697   if (!pPage)
    698     return;
    699 
    700   CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext;
    701   pPage->SetRenderContext(pdfium::WrapUnique(pContext));
    702 
    703   std::unique_ptr<CFX_DIBitmap> pBitmap;
    704   // TODO: This results in unnecessary rasterization of some PDFs due to
    705   // HasImageMask() returning true. If any image on the page is a mask, the
    706   // entire page gets rasterized and the spool size gets huge.
    707   const bool bNewBitmap =
    708       pPage->BackgroundAlphaNeeded() || pPage->HasImageMask();
    709   if (bNewBitmap) {
    710     pBitmap = pdfium::MakeUnique<CFX_DIBitmap>();
    711     pBitmap->Create(size_x, size_y, FXDIB_Argb);
    712     pBitmap->Clear(0x00ffffff);
    713     CFX_FxgeDevice* pDevice = new CFX_FxgeDevice;
    714     pContext->m_pDevice = pdfium::WrapUnique(pDevice);
    715     pDevice->Attach(pBitmap.get(), false, nullptr, false);
    716   } else {
    717     pContext->m_pDevice = pdfium::MakeUnique<CFX_WindowsDevice>(dc);
    718   }
    719 
    720   FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
    721                          rotate, flags, true, nullptr);
    722 
    723   if (bNewBitmap) {
    724     CFX_WindowsDevice WinDC(dc);
    725     if (WinDC.GetDeviceCaps(FXDC_DEVICE_CLASS) == FXDC_PRINTER) {
    726       std::unique_ptr<CFX_DIBitmap> pDst = pdfium::MakeUnique<CFX_DIBitmap>();
    727       int pitch = pBitmap->GetPitch();
    728       pDst->Create(size_x, size_y, FXDIB_Rgb32);
    729       FXSYS_memset(pDst->GetBuffer(), -1, pitch * size_y);
    730       pDst->CompositeBitmap(0, 0, size_x, size_y, pBitmap.get(), 0, 0,
    731                             FXDIB_BLEND_NORMAL, nullptr, false, nullptr);
    732       WinDC.StretchDIBits(pDst.get(), 0, 0, size_x, size_y);
    733     } else {
    734       WinDC.SetDIBits(pBitmap.get(), 0, 0);
    735     }
    736   }
    737 
    738   pPage->SetRenderContext(nullptr);
    739 }
    740 #endif  // defined(_WIN32)
    741 
    742 DLLEXPORT void STDCALL FPDF_RenderPageBitmap(FPDF_BITMAP bitmap,
    743                                              FPDF_PAGE page,
    744                                              int start_x,
    745                                              int start_y,
    746                                              int size_x,
    747                                              int size_y,
    748                                              int rotate,
    749                                              int flags) {
    750   if (!bitmap)
    751     return;
    752 
    753   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
    754   if (!pPage)
    755     return;
    756 
    757   CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext;
    758   pPage->SetRenderContext(pdfium::WrapUnique(pContext));
    759   CFX_FxgeDevice* pDevice = new CFX_FxgeDevice;
    760   pContext->m_pDevice.reset(pDevice);
    761   CFX_DIBitmap* pBitmap = CFXBitmapFromFPDFBitmap(bitmap);
    762   pDevice->Attach(pBitmap, !!(flags & FPDF_REVERSE_BYTE_ORDER), nullptr, false);
    763 
    764   FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
    765                          rotate, flags, true, nullptr);
    766 
    767 #ifdef _SKIA_SUPPORT_PATHS_
    768   pDevice->Flush();
    769   pBitmap->UnPreMultiply();
    770 #endif
    771   pPage->SetRenderContext(nullptr);
    772 }
    773 
    774 DLLEXPORT void STDCALL FPDF_RenderPageBitmapWithMatrix(FPDF_BITMAP bitmap,
    775                                                        FPDF_PAGE page,
    776                                                        const FS_MATRIX* matrix,
    777                                                        const FS_RECTF* clipping,
    778                                                        int flags) {
    779   if (!bitmap)
    780     return;
    781 
    782   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
    783   if (!pPage)
    784     return;
    785 
    786   CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext;
    787   pPage->SetRenderContext(pdfium::WrapUnique(pContext));
    788   CFX_FxgeDevice* pDevice = new CFX_FxgeDevice;
    789   pContext->m_pDevice.reset(pDevice);
    790   CFX_DIBitmap* pBitmap = CFXBitmapFromFPDFBitmap(bitmap);
    791   pDevice->Attach(pBitmap, !!(flags & FPDF_REVERSE_BYTE_ORDER), nullptr, false);
    792 
    793   CFX_Matrix transform_matrix = pPage->GetPageMatrix();
    794   if (matrix) {
    795     transform_matrix.Concat(CFX_Matrix(matrix->a, matrix->b, matrix->c,
    796                                        matrix->d, matrix->e, matrix->f));
    797   }
    798 
    799   CFX_FloatRect clipping_rect;
    800   if (clipping) {
    801     clipping_rect.left = clipping->left;
    802     clipping_rect.bottom = clipping->bottom;
    803     clipping_rect.right = clipping->right;
    804     clipping_rect.top = clipping->top;
    805   }
    806   RenderPageImpl(pContext, pPage, transform_matrix, clipping_rect.ToFxRect(),
    807                  flags, true, nullptr);
    808 
    809   pPage->SetRenderContext(nullptr);
    810 }
    811 
    812 #ifdef _SKIA_SUPPORT_
    813 DLLEXPORT FPDF_RECORDER STDCALL FPDF_RenderPageSkp(FPDF_PAGE page,
    814                                                    int size_x,
    815                                                    int size_y) {
    816   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
    817   if (!pPage)
    818     return nullptr;
    819 
    820   CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext;
    821   pPage->SetRenderContext(pdfium::WrapUnique(pContext));
    822   CFX_FxgeDevice* skDevice = new CFX_FxgeDevice;
    823   FPDF_RECORDER recorder = skDevice->CreateRecorder(size_x, size_y);
    824   pContext->m_pDevice.reset(skDevice);
    825   FPDF_RenderPage_Retail(pContext, page, 0, 0, size_x, size_y, 0, 0, true,
    826                          nullptr);
    827   pPage->SetRenderContext(nullptr);
    828   return recorder;
    829 }
    830 #endif
    831 
    832 DLLEXPORT void STDCALL FPDF_ClosePage(FPDF_PAGE page) {
    833   UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
    834   if (!page)
    835     return;
    836 #ifdef PDF_ENABLE_XFA
    837   pPage->Release();
    838 #else   // PDF_ENABLE_XFA
    839   CPDFSDK_PageView* pPageView =
    840       static_cast<CPDFSDK_PageView*>(pPage->GetView());
    841   if (pPageView) {
    842     // We're already destroying the pageview, so bail early.
    843     if (pPageView->IsBeingDestroyed())
    844       return;
    845 
    846     if (pPageView->IsLocked()) {
    847       pPageView->TakePageOwnership();
    848       return;
    849     }
    850 
    851     bool owned = pPageView->OwnsPage();
    852     // This will delete the |pPageView| object. We must cleanup the PageView
    853     // first because it will attempt to reset the View on the |pPage| during
    854     // destruction.
    855     pPageView->GetFormFillEnv()->RemovePageView(pPage);
    856     // If the page was owned then the pageview will have deleted the page.
    857     if (owned)
    858       return;
    859   }
    860   delete pPage;
    861 #endif  // PDF_ENABLE_XFA
    862 }
    863 
    864 DLLEXPORT void STDCALL FPDF_CloseDocument(FPDF_DOCUMENT document) {
    865   delete UnderlyingFromFPDFDocument(document);
    866 }
    867 
    868 DLLEXPORT unsigned long STDCALL FPDF_GetLastError() {
    869   return GetLastError();
    870 }
    871 
    872 DLLEXPORT void STDCALL FPDF_DeviceToPage(FPDF_PAGE page,
    873                                          int start_x,
    874                                          int start_y,
    875                                          int size_x,
    876                                          int size_y,
    877                                          int rotate,
    878                                          int device_x,
    879                                          int device_y,
    880                                          double* page_x,
    881                                          double* page_y) {
    882   if (!page || !page_x || !page_y)
    883     return;
    884   UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
    885 #ifdef PDF_ENABLE_XFA
    886   pPage->DeviceToPage(start_x, start_y, size_x, size_y, rotate, device_x,
    887                       device_y, page_x, page_y);
    888 #else   // PDF_ENABLE_XFA
    889   CFX_Matrix page2device =
    890       pPage->GetDisplayMatrix(start_x, start_y, size_x, size_y, rotate);
    891   CFX_Matrix device2page;
    892   device2page.SetReverse(page2device);
    893 
    894   CFX_PointF pos = device2page.Transform(CFX_PointF(
    895       static_cast<FX_FLOAT>(device_x), static_cast<FX_FLOAT>(device_y)));
    896 
    897   *page_x = pos.x;
    898   *page_y = pos.y;
    899 #endif  // PDF_ENABLE_XFA
    900 }
    901 
    902 DLLEXPORT void STDCALL FPDF_PageToDevice(FPDF_PAGE page,
    903                                          int start_x,
    904                                          int start_y,
    905                                          int size_x,
    906                                          int size_y,
    907                                          int rotate,
    908                                          double page_x,
    909                                          double page_y,
    910                                          int* device_x,
    911                                          int* device_y) {
    912   if (!device_x || !device_y)
    913     return;
    914   UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
    915   if (!pPage)
    916     return;
    917 #ifdef PDF_ENABLE_XFA
    918   pPage->PageToDevice(start_x, start_y, size_x, size_y, rotate, page_x, page_y,
    919                       device_x, device_y);
    920 #else   // PDF_ENABLE_XFA
    921   CFX_Matrix page2device =
    922       pPage->GetDisplayMatrix(start_x, start_y, size_x, size_y, rotate);
    923   CFX_PointF pos = page2device.Transform(
    924       CFX_PointF(static_cast<FX_FLOAT>(page_x), static_cast<FX_FLOAT>(page_y)));
    925 
    926   *device_x = FXSYS_round(pos.x);
    927   *device_y = FXSYS_round(pos.y);
    928 #endif  // PDF_ENABLE_XFA
    929 }
    930 
    931 DLLEXPORT FPDF_BITMAP STDCALL FPDFBitmap_Create(int width,
    932                                                 int height,
    933                                                 int alpha) {
    934   auto pBitmap = pdfium::MakeUnique<CFX_DIBitmap>();
    935   if (!pBitmap->Create(width, height, alpha ? FXDIB_Argb : FXDIB_Rgb32))
    936     return nullptr;
    937 
    938   return pBitmap.release();
    939 }
    940 
    941 DLLEXPORT FPDF_BITMAP STDCALL FPDFBitmap_CreateEx(int width,
    942                                                   int height,
    943                                                   int format,
    944                                                   void* first_scan,
    945                                                   int stride) {
    946   FXDIB_Format fx_format;
    947   switch (format) {
    948     case FPDFBitmap_Gray:
    949       fx_format = FXDIB_8bppRgb;
    950       break;
    951     case FPDFBitmap_BGR:
    952       fx_format = FXDIB_Rgb;
    953       break;
    954     case FPDFBitmap_BGRx:
    955       fx_format = FXDIB_Rgb32;
    956       break;
    957     case FPDFBitmap_BGRA:
    958       fx_format = FXDIB_Argb;
    959       break;
    960     default:
    961       return nullptr;
    962   }
    963   CFX_DIBitmap* pBitmap = new CFX_DIBitmap;
    964   pBitmap->Create(width, height, fx_format, (uint8_t*)first_scan, stride);
    965   return pBitmap;
    966 }
    967 
    968 DLLEXPORT void STDCALL FPDFBitmap_FillRect(FPDF_BITMAP bitmap,
    969                                            int left,
    970                                            int top,
    971                                            int width,
    972                                            int height,
    973                                            FPDF_DWORD color) {
    974   if (!bitmap)
    975     return;
    976 
    977   CFX_FxgeDevice device;
    978   CFX_DIBitmap* pBitmap = CFXBitmapFromFPDFBitmap(bitmap);
    979   device.Attach(pBitmap, false, nullptr, false);
    980   if (!pBitmap->HasAlpha())
    981     color |= 0xFF000000;
    982   FX_RECT rect(left, top, left + width, top + height);
    983   device.FillRect(&rect, color);
    984 }
    985 
    986 DLLEXPORT void* STDCALL FPDFBitmap_GetBuffer(FPDF_BITMAP bitmap) {
    987   return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetBuffer() : nullptr;
    988 }
    989 
    990 DLLEXPORT int STDCALL FPDFBitmap_GetWidth(FPDF_BITMAP bitmap) {
    991   return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetWidth() : 0;
    992 }
    993 
    994 DLLEXPORT int STDCALL FPDFBitmap_GetHeight(FPDF_BITMAP bitmap) {
    995   return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetHeight() : 0;
    996 }
    997 
    998 DLLEXPORT int STDCALL FPDFBitmap_GetStride(FPDF_BITMAP bitmap) {
    999   return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetPitch() : 0;
   1000 }
   1001 
   1002 DLLEXPORT void STDCALL FPDFBitmap_Destroy(FPDF_BITMAP bitmap) {
   1003   delete CFXBitmapFromFPDFBitmap(bitmap);
   1004 }
   1005 
   1006 void FPDF_RenderPage_Retail(CPDF_PageRenderContext* pContext,
   1007                             FPDF_PAGE page,
   1008                             int start_x,
   1009                             int start_y,
   1010                             int size_x,
   1011                             int size_y,
   1012                             int rotate,
   1013                             int flags,
   1014                             bool bNeedToRestore,
   1015                             IFSDK_PAUSE_Adapter* pause) {
   1016   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   1017   if (!pPage)
   1018     return;
   1019 
   1020   RenderPageImpl(pContext, pPage, pPage->GetDisplayMatrix(
   1021                                       start_x, start_y, size_x, size_y, rotate),
   1022                  FX_RECT(start_x, start_y, start_x + size_x, start_y + size_y),
   1023                  flags, bNeedToRestore, pause);
   1024 }
   1025 
   1026 DLLEXPORT int STDCALL FPDF_GetPageSizeByIndex(FPDF_DOCUMENT document,
   1027                                               int page_index,
   1028                                               double* width,
   1029                                               double* height) {
   1030   UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
   1031   if (!pDoc)
   1032     return false;
   1033 
   1034 #ifdef PDF_ENABLE_XFA
   1035   int count = pDoc->GetPageCount();
   1036   if (page_index < 0 || page_index >= count)
   1037     return false;
   1038   CPDFXFA_Page* pPage = pDoc->GetXFAPage(page_index);
   1039   if (!pPage)
   1040     return false;
   1041   *width = pPage->GetPageWidth();
   1042   *height = pPage->GetPageHeight();
   1043 #else   // PDF_ENABLE_XFA
   1044   CPDF_Dictionary* pDict = pDoc->GetPage(page_index);
   1045   if (!pDict)
   1046     return false;
   1047 
   1048   CPDF_Page page(pDoc, pDict, true);
   1049   *width = page.GetPageWidth();
   1050   *height = page.GetPageHeight();
   1051 #endif  // PDF_ENABLE_XFA
   1052 
   1053   return true;
   1054 }
   1055 
   1056 DLLEXPORT FPDF_BOOL STDCALL
   1057 FPDF_VIEWERREF_GetPrintScaling(FPDF_DOCUMENT document) {
   1058   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
   1059   if (!pDoc)
   1060     return true;
   1061   CPDF_ViewerPreferences viewRef(pDoc);
   1062   return viewRef.PrintScaling();
   1063 }
   1064 
   1065 DLLEXPORT int STDCALL FPDF_VIEWERREF_GetNumCopies(FPDF_DOCUMENT document) {
   1066   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
   1067   if (!pDoc)
   1068     return 1;
   1069   CPDF_ViewerPreferences viewRef(pDoc);
   1070   return viewRef.NumCopies();
   1071 }
   1072 
   1073 DLLEXPORT FPDF_PAGERANGE STDCALL
   1074 FPDF_VIEWERREF_GetPrintPageRange(FPDF_DOCUMENT document) {
   1075   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
   1076   if (!pDoc)
   1077     return nullptr;
   1078   CPDF_ViewerPreferences viewRef(pDoc);
   1079   return viewRef.PrintPageRange();
   1080 }
   1081 
   1082 DLLEXPORT FPDF_DUPLEXTYPE STDCALL
   1083 FPDF_VIEWERREF_GetDuplex(FPDF_DOCUMENT document) {
   1084   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
   1085   if (!pDoc)
   1086     return DuplexUndefined;
   1087   CPDF_ViewerPreferences viewRef(pDoc);
   1088   CFX_ByteString duplex = viewRef.Duplex();
   1089   if ("Simplex" == duplex)
   1090     return Simplex;
   1091   if ("DuplexFlipShortEdge" == duplex)
   1092     return DuplexFlipShortEdge;
   1093   if ("DuplexFlipLongEdge" == duplex)
   1094     return DuplexFlipLongEdge;
   1095   return DuplexUndefined;
   1096 }
   1097 
   1098 DLLEXPORT unsigned long STDCALL FPDF_VIEWERREF_GetName(FPDF_DOCUMENT document,
   1099                                                        FPDF_BYTESTRING key,
   1100                                                        char* buffer,
   1101                                                        unsigned long length) {
   1102   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
   1103   if (!pDoc)
   1104     return 0;
   1105 
   1106   CPDF_ViewerPreferences viewRef(pDoc);
   1107   CFX_ByteString bsVal;
   1108   if (!viewRef.GenericName(key, &bsVal))
   1109     return 0;
   1110 
   1111   unsigned long dwStringLen = bsVal.GetLength() + 1;
   1112   if (buffer && length >= dwStringLen)
   1113     memcpy(buffer, bsVal.c_str(), dwStringLen);
   1114   return dwStringLen;
   1115 }
   1116 
   1117 DLLEXPORT FPDF_DWORD STDCALL FPDF_CountNamedDests(FPDF_DOCUMENT document) {
   1118   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
   1119   if (!pDoc)
   1120     return 0;
   1121 
   1122   CPDF_Dictionary* pRoot = pDoc->GetRoot();
   1123   if (!pRoot)
   1124     return 0;
   1125 
   1126   CPDF_NameTree nameTree(pDoc, "Dests");
   1127   pdfium::base::CheckedNumeric<FPDF_DWORD> count = nameTree.GetCount();
   1128   CPDF_Dictionary* pDest = pRoot->GetDictFor("Dests");
   1129   if (pDest)
   1130     count += pDest->GetCount();
   1131 
   1132   if (!count.IsValid())
   1133     return 0;
   1134 
   1135   return count.ValueOrDie();
   1136 }
   1137 
   1138 DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDestByName(FPDF_DOCUMENT document,
   1139                                                     FPDF_BYTESTRING name) {
   1140   if (!name || name[0] == 0)
   1141     return nullptr;
   1142 
   1143   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
   1144   if (!pDoc)
   1145     return nullptr;
   1146 
   1147   CPDF_NameTree name_tree(pDoc, "Dests");
   1148   return name_tree.LookupNamedDest(pDoc, name);
   1149 }
   1150 
   1151 #ifdef PDF_ENABLE_XFA
   1152 DLLEXPORT FPDF_RESULT STDCALL FPDF_BStr_Init(FPDF_BSTR* str) {
   1153   if (!str)
   1154     return -1;
   1155 
   1156   FXSYS_memset(str, 0, sizeof(FPDF_BSTR));
   1157   return 0;
   1158 }
   1159 
   1160 DLLEXPORT FPDF_RESULT STDCALL FPDF_BStr_Set(FPDF_BSTR* str,
   1161                                             FPDF_LPCSTR bstr,
   1162                                             int length) {
   1163   if (!str)
   1164     return -1;
   1165   if (!bstr || !length)
   1166     return -1;
   1167   if (length == -1)
   1168     length = FXSYS_strlen(bstr);
   1169 
   1170   if (length == 0) {
   1171     if (str->str) {
   1172       FX_Free(str->str);
   1173       str->str = nullptr;
   1174     }
   1175     str->len = 0;
   1176     return 0;
   1177   }
   1178 
   1179   if (str->str && str->len < length)
   1180     str->str = FX_Realloc(char, str->str, length + 1);
   1181   else if (!str->str)
   1182     str->str = FX_Alloc(char, length + 1);
   1183 
   1184   str->str[length] = 0;
   1185   FXSYS_memcpy(str->str, bstr, length);
   1186   str->len = length;
   1187 
   1188   return 0;
   1189 }
   1190 
   1191 DLLEXPORT FPDF_RESULT STDCALL FPDF_BStr_Clear(FPDF_BSTR* str) {
   1192   if (!str)
   1193     return -1;
   1194 
   1195   if (str->str) {
   1196     FX_Free(str->str);
   1197     str->str = nullptr;
   1198   }
   1199   str->len = 0;
   1200   return 0;
   1201 }
   1202 #endif  // PDF_ENABLE_XFA
   1203 
   1204 DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDest(FPDF_DOCUMENT document,
   1205                                               int index,
   1206                                               void* buffer,
   1207                                               long* buflen) {
   1208   if (!buffer)
   1209     *buflen = 0;
   1210 
   1211   if (index < 0)
   1212     return nullptr;
   1213 
   1214   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
   1215   if (!pDoc)
   1216     return nullptr;
   1217 
   1218   CPDF_Dictionary* pRoot = pDoc->GetRoot();
   1219   if (!pRoot)
   1220     return nullptr;
   1221 
   1222   CPDF_Object* pDestObj = nullptr;
   1223   CFX_ByteString bsName;
   1224   CPDF_NameTree nameTree(pDoc, "Dests");
   1225   int count = nameTree.GetCount();
   1226   if (index >= count) {
   1227     CPDF_Dictionary* pDest = pRoot->GetDictFor("Dests");
   1228     if (!pDest)
   1229       return nullptr;
   1230 
   1231     pdfium::base::CheckedNumeric<int> checked_count = count;
   1232     checked_count += pDest->GetCount();
   1233     if (!checked_count.IsValid() || index >= checked_count.ValueOrDie())
   1234       return nullptr;
   1235 
   1236     index -= count;
   1237     int i = 0;
   1238     for (const auto& it : *pDest) {
   1239       bsName = it.first;
   1240       pDestObj = it.second.get();
   1241       if (!pDestObj)
   1242         continue;
   1243       if (i == index)
   1244         break;
   1245       i++;
   1246     }
   1247   } else {
   1248     pDestObj = nameTree.LookupValue(index, bsName);
   1249   }
   1250   if (!pDestObj)
   1251     return nullptr;
   1252   if (CPDF_Dictionary* pDict = pDestObj->AsDictionary()) {
   1253     pDestObj = pDict->GetArrayFor("D");
   1254     if (!pDestObj)
   1255       return nullptr;
   1256   }
   1257   if (!pDestObj->IsArray())
   1258     return nullptr;
   1259 
   1260   CFX_WideString wsName = PDF_DecodeText(bsName);
   1261   CFX_ByteString utf16Name = wsName.UTF16LE_Encode();
   1262   int len = utf16Name.GetLength();
   1263   if (!buffer) {
   1264     *buflen = len;
   1265   } else if (len <= *buflen) {
   1266     memcpy(buffer, utf16Name.c_str(), len);
   1267     *buflen = len;
   1268   } else {
   1269     *buflen = -1;
   1270   }
   1271   return (FPDF_DEST)pDestObj;
   1272 }
   1273