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
67namespace {
68
69// Also indicates whether library is currently initialized.
70CCodec_ModuleMgr* g_pCodecModule = nullptr;
71
72void 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
136class 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
152CPDF_CustomAccess::CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess)
153    : m_FileAccess(*pFileAccess) {}
154
155FX_FILESIZE CPDF_CustomAccess::GetSize() {
156  return m_FileAccess.m_FileLen;
157}
158
159bool 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
176class 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
201CFPDF_FileStream::CFPDF_FileStream(FPDF_FILEHANDLER* pFS) {
202  m_pFS = pFS;
203  m_nCurPos = 0;
204}
205
206CFPDF_FileStream::~CFPDF_FileStream() {
207  if (m_pFS && m_pFS->Release)
208    m_pFS->Release(m_pFS->clientData);
209}
210
211FX_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
217bool CFPDF_FileStream::IsEOF() {
218  return m_nCurPos >= GetSize();
219}
220
221FX_FILESIZE CFPDF_FileStream::GetPosition() {
222  return m_nCurPos;
223}
224
225bool 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
239size_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
258bool 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
272bool 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
282UnderlyingDocumentType* UnderlyingFromFPDFDocument(FPDF_DOCUMENT doc) {
283  return static_cast<UnderlyingDocumentType*>(doc);
284}
285
286FPDF_DOCUMENT FPDFDocumentFromUnderlying(UnderlyingDocumentType* doc) {
287  return static_cast<FPDF_DOCUMENT>(doc);
288}
289
290UnderlyingPageType* UnderlyingFromFPDFPage(FPDF_PAGE page) {
291  return static_cast<UnderlyingPageType*>(page);
292}
293
294CPDF_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
302FPDF_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
312CPDF_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
320CFX_DIBitmap* CFXBitmapFromFPDFBitmap(FPDF_BITMAP bitmap) {
321  return static_cast<CFX_DIBitmap*>(bitmap);
322}
323
324CFX_RetainPtr<IFX_SeekableReadStream> MakeSeekableReadStream(
325    FPDF_FILEACCESS* pFileAccess) {
326  return CPDF_CustomAccess::Create(pFileAccess);
327}
328
329#ifdef PDF_ENABLE_XFA
330CFX_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
337static uint32_t foxit_sandbox_policy = 0xFFFFFFFF;
338
339void 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
352FPDF_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
361DLLEXPORT void STDCALL FPDF_InitLibrary() {
362  FPDF_InitLibraryWithConfig(nullptr);
363}
364
365DLLEXPORT void STDCALL
366FPDF_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
411DLLEXPORT 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
430int g_LastError;
431void SetLastError(int err) {
432  g_LastError = err;
433}
434
435int GetLastError() {
436  return g_LastError;
437}
438#endif  // _WIN32
439
440void 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
463DLLEXPORT 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)
470DLLEXPORT void STDCALL
471FPDF_SetTypefaceAccessibleFunc(PDFiumEnsureTypefaceCharactersAccessible func) {
472  g_pdfium_typeface_accessible_func = func;
473}
474
475DLLEXPORT 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
480DLLEXPORT 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
488DLLEXPORT 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
511DLLEXPORT 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
538DLLEXPORT FPDF_BOOL STDCALL FPDF_LoadXFA(FPDF_DOCUMENT document) {
539  return document && (static_cast<CPDFXFA_Context*>(document))->LoadXFADoc();
540}
541#endif  // PDF_ENABLE_XFA
542
543class 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
570DLLEXPORT 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
588DLLEXPORT FPDF_DOCUMENT STDCALL
589FPDF_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
607DLLEXPORT 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).
627DLLEXPORT 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
641DLLEXPORT 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
650DLLEXPORT int STDCALL FPDF_GetPageCount(FPDF_DOCUMENT document) {
651  UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
652  return pDoc ? pDoc->GetPageCount() : 0;
653}
654
655DLLEXPORT 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
677DLLEXPORT double STDCALL FPDF_GetPageWidth(FPDF_PAGE page) {
678  UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
679  return pPage ? pPage->GetPageWidth() : 0.0;
680}
681
682DLLEXPORT 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)
688DLLEXPORT 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
742DLLEXPORT 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
774DLLEXPORT 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_
813DLLEXPORT 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
832DLLEXPORT 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
864DLLEXPORT void STDCALL FPDF_CloseDocument(FPDF_DOCUMENT document) {
865  delete UnderlyingFromFPDFDocument(document);
866}
867
868DLLEXPORT unsigned long STDCALL FPDF_GetLastError() {
869  return GetLastError();
870}
871
872DLLEXPORT 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
902DLLEXPORT 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
931DLLEXPORT 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
941DLLEXPORT 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
968DLLEXPORT 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
986DLLEXPORT void* STDCALL FPDFBitmap_GetBuffer(FPDF_BITMAP bitmap) {
987  return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetBuffer() : nullptr;
988}
989
990DLLEXPORT int STDCALL FPDFBitmap_GetWidth(FPDF_BITMAP bitmap) {
991  return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetWidth() : 0;
992}
993
994DLLEXPORT int STDCALL FPDFBitmap_GetHeight(FPDF_BITMAP bitmap) {
995  return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetHeight() : 0;
996}
997
998DLLEXPORT int STDCALL FPDFBitmap_GetStride(FPDF_BITMAP bitmap) {
999  return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetPitch() : 0;
1000}
1001
1002DLLEXPORT void STDCALL FPDFBitmap_Destroy(FPDF_BITMAP bitmap) {
1003  delete CFXBitmapFromFPDFBitmap(bitmap);
1004}
1005
1006void 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
1026DLLEXPORT 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
1056DLLEXPORT FPDF_BOOL STDCALL
1057FPDF_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
1065DLLEXPORT 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
1073DLLEXPORT FPDF_PAGERANGE STDCALL
1074FPDF_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
1082DLLEXPORT FPDF_DUPLEXTYPE STDCALL
1083FPDF_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
1098DLLEXPORT 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
1117DLLEXPORT 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
1138DLLEXPORT 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
1152DLLEXPORT 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
1160DLLEXPORT 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
1191DLLEXPORT 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
1204DLLEXPORT 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