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 #include <vector>
12 
13 #include "core/fpdfapi/cpdf_modulemgr.h"
14 #include "core/fpdfapi/cpdf_pagerendercontext.h"
15 #include "core/fpdfapi/page/cpdf_image.h"
16 #include "core/fpdfapi/page/cpdf_imageobject.h"
17 #include "core/fpdfapi/page/cpdf_page.h"
18 #include "core/fpdfapi/page/cpdf_pageobject.h"
19 #include "core/fpdfapi/page/cpdf_pathobject.h"
20 #include "core/fpdfapi/parser/cpdf_array.h"
21 #include "core/fpdfapi/parser/cpdf_dictionary.h"
22 #include "core/fpdfapi/parser/cpdf_document.h"
23 #include "core/fpdfapi/parser/fpdf_parser_decode.h"
24 #include "core/fpdfapi/render/cpdf_progressiverenderer.h"
25 #include "core/fpdfapi/render/cpdf_renderoptions.h"
26 #include "core/fpdfdoc/cpdf_annotlist.h"
27 #include "core/fpdfdoc/cpdf_nametree.h"
28 #include "core/fpdfdoc/cpdf_occontext.h"
29 #include "core/fpdfdoc/cpdf_viewerpreferences.h"
30 #include "core/fxcrt/fx_memory.h"
31 #include "core/fxcrt/fx_safe_types.h"
32 #include "core/fxcrt/fx_stream.h"
33 #include "core/fxge/cfx_defaultrenderdevice.h"
34 #include "core/fxge/cfx_gemodule.h"
35 #include "fpdfsdk/cpdfsdk_formfillenvironment.h"
36 #include "fpdfsdk/cpdfsdk_pageview.h"
37 #include "fpdfsdk/fsdk_define.h"
38 #include "fpdfsdk/fsdk_pauseadapter.h"
39 #include "fxjs/ijs_runtime.h"
40 #include "public/fpdf_edit.h"
41 #include "public/fpdf_ext.h"
42 #include "public/fpdf_formfill.h"
43 #include "public/fpdf_progressive.h"
44 #include "third_party/base/allocator/partition_allocator/partition_alloc.h"
45 #include "third_party/base/numerics/safe_conversions_impl.h"
46 #include "third_party/base/ptr_util.h"
47 
48 #ifdef PDF_ENABLE_XFA
49 #include "fpdfsdk/fpdfxfa/cpdfxfa_context.h"
50 #include "fpdfsdk/fpdfxfa/cpdfxfa_page.h"
51 #include "fpdfsdk/fpdfxfa/cxfa_fwladaptertimermgr.h"
52 #include "fxbarcode/BC_Library.h"
53 #endif  // PDF_ENABLE_XFA
54 
55 #if _FX_PLATFORM_ == _FX_PLATFORM_WINDOWS_
56 #include "core/fxge/cfx_windowsrenderdevice.h"
57 
58 // These checks are here because core/ and public/ cannot depend on each other.
59 static_assert(WindowsPrintMode::kModeEmf == FPDF_PRINTMODE_EMF,
60               "WindowsPrintMode::kModeEmf value mismatch");
61 static_assert(WindowsPrintMode::kModeTextOnly == FPDF_PRINTMODE_TEXTONLY,
62               "WindowsPrintMode::kModeTextOnly value mismatch");
63 static_assert(WindowsPrintMode::kModePostScript2 == FPDF_PRINTMODE_POSTSCRIPT2,
64               "WindowsPrintMode::kModePostScript2 value mismatch");
65 static_assert(WindowsPrintMode::kModePostScript3 == FPDF_PRINTMODE_POSTSCRIPT3,
66               "WindowsPrintMode::kModePostScript3 value mismatch");
67 #endif
68 
69 namespace {
70 
71 bool g_bLibraryInitialized = false;
72 
RenderPageImpl(CPDF_PageRenderContext * pContext,CPDF_Page * pPage,const CFX_Matrix & matrix,const FX_RECT & clipping_rect,int flags,bool bNeedToRestore,IFSDK_PAUSE_Adapter * pause)73 void RenderPageImpl(CPDF_PageRenderContext* pContext,
74                     CPDF_Page* pPage,
75                     const CFX_Matrix& matrix,
76                     const FX_RECT& clipping_rect,
77                     int flags,
78                     bool bNeedToRestore,
79                     IFSDK_PAUSE_Adapter* pause) {
80   if (!pContext->m_pOptions)
81     pContext->m_pOptions = pdfium::MakeUnique<CPDF_RenderOptions>();
82 
83   uint32_t option_flags = pContext->m_pOptions->GetFlags();
84   if (flags & FPDF_LCD_TEXT)
85     option_flags |= RENDER_CLEARTYPE;
86   else
87     option_flags &= ~RENDER_CLEARTYPE;
88 
89   if (flags & FPDF_NO_NATIVETEXT)
90     option_flags |= RENDER_NO_NATIVETEXT;
91   if (flags & FPDF_RENDER_LIMITEDIMAGECACHE)
92     option_flags |= RENDER_LIMITEDIMAGECACHE;
93   if (flags & FPDF_RENDER_FORCEHALFTONE)
94     option_flags |= RENDER_FORCE_HALFTONE;
95 #ifndef PDF_ENABLE_XFA
96   if (flags & FPDF_RENDER_NO_SMOOTHTEXT)
97     option_flags |= RENDER_NOTEXTSMOOTH;
98   if (flags & FPDF_RENDER_NO_SMOOTHIMAGE)
99     option_flags |= RENDER_NOIMAGESMOOTH;
100   if (flags & FPDF_RENDER_NO_SMOOTHPATH)
101     option_flags |= RENDER_NOPATHSMOOTH;
102 #endif  // PDF_ENABLE_XFA
103   pContext->m_pOptions->SetFlags(option_flags);
104 
105   // Grayscale output
106   if (flags & FPDF_GRAYSCALE)
107     pContext->m_pOptions->SetColorMode(CPDF_RenderOptions::kGray);
108 
109   const CPDF_OCContext::UsageType usage =
110       (flags & FPDF_PRINTING) ? CPDF_OCContext::Print : CPDF_OCContext::View;
111   pContext->m_pOptions->SetOCContext(
112       pdfium::MakeRetain<CPDF_OCContext>(pPage->m_pDocument.Get(), usage));
113 
114   pContext->m_pDevice->SaveState();
115   pContext->m_pDevice->SetClip_Rect(clipping_rect);
116   pContext->m_pContext = pdfium::MakeUnique<CPDF_RenderContext>(pPage);
117   pContext->m_pContext->AppendLayer(pPage, &matrix);
118 
119   if (flags & FPDF_ANNOT) {
120     pContext->m_pAnnots = pdfium::MakeUnique<CPDF_AnnotList>(pPage);
121     bool bPrinting = pContext->m_pDevice->GetDeviceClass() != FXDC_DISPLAY;
122     pContext->m_pAnnots->DisplayAnnots(pPage, pContext->m_pContext.get(),
123                                        bPrinting, &matrix, false, nullptr);
124   }
125 
126   pContext->m_pRenderer = pdfium::MakeUnique<CPDF_ProgressiveRenderer>(
127       pContext->m_pContext.get(), pContext->m_pDevice.get(),
128       pContext->m_pOptions.get());
129   pContext->m_pRenderer->Start(pause);
130   if (bNeedToRestore)
131     pContext->m_pDevice->RestoreState(false);
132 }
133 
134 class CPDF_CustomAccess final : public IFX_SeekableReadStream {
135  public:
136   template <typename T, typename... Args>
137   friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);
138 
139   // IFX_SeekableReadStream
140   FX_FILESIZE GetSize() override;
141   bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
142 
143  private:
144   explicit CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess);
145 
146   FPDF_FILEACCESS m_FileAccess;
147 };
148 
CPDF_CustomAccess(FPDF_FILEACCESS * pFileAccess)149 CPDF_CustomAccess::CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess)
150     : m_FileAccess(*pFileAccess) {}
151 
GetSize()152 FX_FILESIZE CPDF_CustomAccess::GetSize() {
153   return m_FileAccess.m_FileLen;
154 }
155 
ReadBlock(void * buffer,FX_FILESIZE offset,size_t size)156 bool CPDF_CustomAccess::ReadBlock(void* buffer,
157                                   FX_FILESIZE offset,
158                                   size_t size) {
159   if (offset < 0)
160     return false;
161 
162   FX_SAFE_FILESIZE newPos = pdfium::base::checked_cast<FX_FILESIZE>(size);
163   newPos += offset;
164   if (!newPos.IsValid() ||
165       newPos.ValueOrDie() > static_cast<FX_FILESIZE>(m_FileAccess.m_FileLen)) {
166     return false;
167   }
168   return !!m_FileAccess.m_GetBlock(m_FileAccess.m_Param, offset,
169                                    static_cast<uint8_t*>(buffer), size);
170 }
171 
172 #ifdef PDF_ENABLE_XFA
173 class FPDF_FileHandlerContext : public IFX_SeekableStream {
174  public:
175   template <typename T, typename... Args>
176   friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);
177 
178   ~FPDF_FileHandlerContext() override;
179 
180   // IFX_SeekableStream:
181   FX_FILESIZE GetSize() override;
182   bool IsEOF() override;
183   FX_FILESIZE GetPosition() override;
184   bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
185   size_t ReadBlock(void* buffer, size_t size) override;
186   bool WriteBlock(const void* buffer, FX_FILESIZE offset, size_t size) override;
187   bool Flush() override;
188 
SetPosition(FX_FILESIZE pos)189   void SetPosition(FX_FILESIZE pos) { m_nCurPos = pos; }
190 
191  protected:
192   explicit FPDF_FileHandlerContext(FPDF_FILEHANDLER* pFS);
193 
194   FPDF_FILEHANDLER* m_pFS;
195   FX_FILESIZE m_nCurPos;
196 };
197 
FPDF_FileHandlerContext(FPDF_FILEHANDLER * pFS)198 FPDF_FileHandlerContext::FPDF_FileHandlerContext(FPDF_FILEHANDLER* pFS) {
199   m_pFS = pFS;
200   m_nCurPos = 0;
201 }
202 
~FPDF_FileHandlerContext()203 FPDF_FileHandlerContext::~FPDF_FileHandlerContext() {
204   if (m_pFS && m_pFS->Release)
205     m_pFS->Release(m_pFS->clientData);
206 }
207 
GetSize()208 FX_FILESIZE FPDF_FileHandlerContext::GetSize() {
209   if (m_pFS && m_pFS->GetSize)
210     return (FX_FILESIZE)m_pFS->GetSize(m_pFS->clientData);
211   return 0;
212 }
213 
IsEOF()214 bool FPDF_FileHandlerContext::IsEOF() {
215   return m_nCurPos >= GetSize();
216 }
217 
GetPosition()218 FX_FILESIZE FPDF_FileHandlerContext::GetPosition() {
219   return m_nCurPos;
220 }
221 
ReadBlock(void * buffer,FX_FILESIZE offset,size_t size)222 bool FPDF_FileHandlerContext::ReadBlock(void* buffer,
223                                         FX_FILESIZE offset,
224                                         size_t size) {
225   if (!buffer || !size || !m_pFS->ReadBlock)
226     return false;
227 
228   if (m_pFS->ReadBlock(m_pFS->clientData, (FPDF_DWORD)offset, buffer,
229                        (FPDF_DWORD)size) == 0) {
230     m_nCurPos = offset + size;
231     return true;
232   }
233   return false;
234 }
235 
ReadBlock(void * buffer,size_t size)236 size_t FPDF_FileHandlerContext::ReadBlock(void* buffer, size_t size) {
237   if (!buffer || !size || !m_pFS->ReadBlock)
238     return 0;
239 
240   FX_FILESIZE nSize = GetSize();
241   if (m_nCurPos >= nSize)
242     return 0;
243   FX_FILESIZE dwAvail = nSize - m_nCurPos;
244   if (dwAvail < (FX_FILESIZE)size)
245     size = static_cast<size_t>(dwAvail);
246   if (m_pFS->ReadBlock(m_pFS->clientData, (FPDF_DWORD)m_nCurPos, buffer,
247                        (FPDF_DWORD)size) == 0) {
248     m_nCurPos += size;
249     return size;
250   }
251 
252   return 0;
253 }
254 
WriteBlock(const void * buffer,FX_FILESIZE offset,size_t size)255 bool FPDF_FileHandlerContext::WriteBlock(const void* buffer,
256                                          FX_FILESIZE offset,
257                                          size_t size) {
258   if (!m_pFS || !m_pFS->WriteBlock)
259     return false;
260 
261   if (m_pFS->WriteBlock(m_pFS->clientData, (FPDF_DWORD)offset, buffer,
262                         (FPDF_DWORD)size) == 0) {
263     m_nCurPos = offset + size;
264     return true;
265   }
266   return false;
267 }
268 
Flush()269 bool FPDF_FileHandlerContext::Flush() {
270   if (!m_pFS || !m_pFS->Flush)
271     return true;
272 
273   return m_pFS->Flush(m_pFS->clientData) == 0;
274 }
275 #endif  // PDF_ENABLE_XFA
276 
LoadDocumentImpl(const RetainPtr<IFX_SeekableReadStream> & pFileAccess,FPDF_BYTESTRING password)277 FPDF_DOCUMENT LoadDocumentImpl(
278     const RetainPtr<IFX_SeekableReadStream>& pFileAccess,
279     FPDF_BYTESTRING password) {
280   if (!pFileAccess) {
281     ProcessParseError(CPDF_Parser::FILE_ERROR);
282     return nullptr;
283   }
284 
285   auto pParser = pdfium::MakeUnique<CPDF_Parser>();
286   pParser->SetPassword(password);
287 
288   auto pDocument = pdfium::MakeUnique<CPDF_Document>(std::move(pParser));
289   CPDF_Parser::Error error =
290       pDocument->GetParser()->StartParse(pFileAccess, pDocument.get());
291   if (error != CPDF_Parser::SUCCESS) {
292     ProcessParseError(error);
293     return nullptr;
294   }
295   CheckUnSupportError(pDocument.get(), error);
296   return FPDFDocumentFromCPDFDocument(pDocument.release());
297 }
298 
299 }  // namespace
300 
UnderlyingFromFPDFDocument(FPDF_DOCUMENT doc)301 UnderlyingDocumentType* UnderlyingFromFPDFDocument(FPDF_DOCUMENT doc) {
302   return static_cast<UnderlyingDocumentType*>(doc);
303 }
304 
FPDFDocumentFromUnderlying(UnderlyingDocumentType * doc)305 FPDF_DOCUMENT FPDFDocumentFromUnderlying(UnderlyingDocumentType* doc) {
306   return static_cast<FPDF_DOCUMENT>(doc);
307 }
308 
UnderlyingFromFPDFPage(FPDF_PAGE page)309 UnderlyingPageType* UnderlyingFromFPDFPage(FPDF_PAGE page) {
310   return static_cast<UnderlyingPageType*>(page);
311 }
312 
CPDFDocumentFromFPDFDocument(FPDF_DOCUMENT doc)313 CPDF_Document* CPDFDocumentFromFPDFDocument(FPDF_DOCUMENT doc) {
314 #ifdef PDF_ENABLE_XFA
315   return doc ? UnderlyingFromFPDFDocument(doc)->GetPDFDoc() : nullptr;
316 #else   // PDF_ENABLE_XFA
317   return UnderlyingFromFPDFDocument(doc);
318 #endif  // PDF_ENABLE_XFA
319 }
320 
FPDFDocumentFromCPDFDocument(CPDF_Document * doc)321 FPDF_DOCUMENT FPDFDocumentFromCPDFDocument(CPDF_Document* doc) {
322 #ifdef PDF_ENABLE_XFA
323   return doc ? FPDFDocumentFromUnderlying(
324                    new CPDFXFA_Context(pdfium::WrapUnique(doc)))
325              : nullptr;
326 #else   // PDF_ENABLE_XFA
327   return FPDFDocumentFromUnderlying(doc);
328 #endif  // PDF_ENABLE_XFA
329 }
330 
CPDFPageFromFPDFPage(FPDF_PAGE page)331 CPDF_Page* CPDFPageFromFPDFPage(FPDF_PAGE page) {
332 #ifdef PDF_ENABLE_XFA
333   return page ? UnderlyingFromFPDFPage(page)->GetPDFPage() : nullptr;
334 #else   // PDF_ENABLE_XFA
335   return UnderlyingFromFPDFPage(page);
336 #endif  // PDF_ENABLE_XFA
337 }
338 
CPDFPathObjectFromFPDFPageObject(FPDF_PAGEOBJECT page_object)339 CPDF_PathObject* CPDFPathObjectFromFPDFPageObject(FPDF_PAGEOBJECT page_object) {
340   auto* obj = CPDFPageObjectFromFPDFPageObject(page_object);
341   return obj ? obj->AsPath() : nullptr;
342 }
343 
CPDFPageObjectFromFPDFPageObject(FPDF_PAGEOBJECT page_object)344 CPDF_PageObject* CPDFPageObjectFromFPDFPageObject(FPDF_PAGEOBJECT page_object) {
345   return static_cast<CPDF_PageObject*>(page_object);
346 }
347 
CPDFObjectFromFPDFAttachment(FPDF_ATTACHMENT attachment)348 CPDF_Object* CPDFObjectFromFPDFAttachment(FPDF_ATTACHMENT attachment) {
349   return static_cast<CPDF_Object*>(attachment);
350 }
351 
CFXByteStringFromFPDFWideString(FPDF_WIDESTRING wide_string)352 ByteString CFXByteStringFromFPDFWideString(FPDF_WIDESTRING wide_string) {
353   return WideString::FromUTF16LE(wide_string,
354                                  WideString::WStringLength(wide_string))
355       .UTF8Encode();
356 }
357 
CFXBitmapFromFPDFBitmap(FPDF_BITMAP bitmap)358 CFX_DIBitmap* CFXBitmapFromFPDFBitmap(FPDF_BITMAP bitmap) {
359   return static_cast<CFX_DIBitmap*>(bitmap);
360 }
361 
CFXFloatRectFromFSRECTF(const FS_RECTF & rect)362 CFX_FloatRect CFXFloatRectFromFSRECTF(const FS_RECTF& rect) {
363   return CFX_FloatRect(rect.left, rect.bottom, rect.right, rect.top);
364 }
365 
FSRECTFFromCFXFloatRect(const CFX_FloatRect & rect,FS_RECTF * out_rect)366 void FSRECTFFromCFXFloatRect(const CFX_FloatRect& rect, FS_RECTF* out_rect) {
367   out_rect->left = rect.left;
368   out_rect->top = rect.top;
369   out_rect->right = rect.right;
370   out_rect->bottom = rect.bottom;
371 }
372 
FXPathPointFromFPDFPathSegment(FPDF_PATHSEGMENT segment)373 const FX_PATHPOINT* FXPathPointFromFPDFPathSegment(FPDF_PATHSEGMENT segment) {
374   return static_cast<const FX_PATHPOINT*>(segment);
375 }
376 
Utf16EncodeMaybeCopyAndReturnLength(const WideString & text,void * buffer,unsigned long buflen)377 unsigned long Utf16EncodeMaybeCopyAndReturnLength(const WideString& text,
378                                                   void* buffer,
379                                                   unsigned long buflen) {
380   ByteString encoded_text = text.UTF16LE_Encode();
381   unsigned long len = encoded_text.GetLength();
382   if (buffer && len <= buflen)
383     memcpy(buffer, encoded_text.c_str(), len);
384   return len;
385 }
386 
DecodeStreamMaybeCopyAndReturnLength(const CPDF_Stream * stream,void * buffer,unsigned long buflen)387 unsigned long DecodeStreamMaybeCopyAndReturnLength(const CPDF_Stream* stream,
388                                                    void* buffer,
389                                                    unsigned long buflen) {
390   ASSERT(stream);
391   uint8_t* data = stream->GetRawData();
392   uint32_t len = stream->GetRawSize();
393   CPDF_Dictionary* dict = stream->GetDict();
394   CPDF_Object* decoder = dict ? dict->GetDirectObjectFor("Filter") : nullptr;
395   if (decoder && (decoder->IsArray() || decoder->IsName())) {
396     // Decode the stream if one or more stream filters are specified.
397     uint8_t* decoded_data = nullptr;
398     uint32_t decoded_len = 0;
399     ByteString dummy_last_decoder;
400     CPDF_Dictionary* dummy_last_param;
401     if (PDF_DataDecode(data, len, dict, dict->GetIntegerFor("DL"), false,
402                        &decoded_data, &decoded_len, &dummy_last_decoder,
403                        &dummy_last_param)) {
404       if (buffer && buflen >= decoded_len)
405         memcpy(buffer, decoded_data, decoded_len);
406 
407       // Free the buffer for the decoded data if it was allocated by
408       // PDF_DataDecode(). Note that for images with a single image-specific
409       // filter, |decoded_data| is directly assigned to be |data|, so
410       // |decoded_data| does not need to be freed.
411       if (decoded_data != data)
412         FX_Free(decoded_data);
413 
414       return decoded_len;
415     }
416   }
417   // Copy the raw data and return its length if there is no valid filter
418   // specified or if decoding failed.
419   if (buffer && buflen >= len)
420     memcpy(buffer, data, len);
421 
422   return len;
423 }
424 
MakeSeekableReadStream(FPDF_FILEACCESS * pFileAccess)425 RetainPtr<IFX_SeekableReadStream> MakeSeekableReadStream(
426     FPDF_FILEACCESS* pFileAccess) {
427   return pdfium::MakeRetain<CPDF_CustomAccess>(pFileAccess);
428 }
429 
430 #ifdef PDF_ENABLE_XFA
MakeSeekableStream(FPDF_FILEHANDLER * pFilehandler)431 RetainPtr<IFX_SeekableStream> MakeSeekableStream(
432     FPDF_FILEHANDLER* pFilehandler) {
433   return pdfium::MakeRetain<FPDF_FileHandlerContext>(pFilehandler);
434 }
435 #endif  // PDF_ENABLE_XFA
436 
437 // 0 bit: FPDF_POLICY_MACHINETIME_ACCESS
438 static uint32_t foxit_sandbox_policy = 0xFFFFFFFF;
439 
FSDK_SetSandBoxPolicy(FPDF_DWORD policy,FPDF_BOOL enable)440 void FSDK_SetSandBoxPolicy(FPDF_DWORD policy, FPDF_BOOL enable) {
441   switch (policy) {
442     case FPDF_POLICY_MACHINETIME_ACCESS: {
443       if (enable)
444         foxit_sandbox_policy |= 0x01;
445       else
446         foxit_sandbox_policy &= 0xFFFFFFFE;
447     } break;
448     default:
449       break;
450   }
451 }
452 
FSDK_IsSandBoxPolicyEnabled(FPDF_DWORD policy)453 FPDF_BOOL FSDK_IsSandBoxPolicyEnabled(FPDF_DWORD policy) {
454   switch (policy) {
455     case FPDF_POLICY_MACHINETIME_ACCESS:
456       return !!(foxit_sandbox_policy & 0x01);
457     default:
458       return false;
459   }
460 }
461 
FPDF_InitLibrary()462 FPDF_EXPORT void FPDF_CALLCONV FPDF_InitLibrary() {
463   FPDF_InitLibraryWithConfig(nullptr);
464 }
465 
466 FPDF_EXPORT void FPDF_CALLCONV
FPDF_InitLibraryWithConfig(const FPDF_LIBRARY_CONFIG * cfg)467 FPDF_InitLibraryWithConfig(const FPDF_LIBRARY_CONFIG* cfg) {
468   if (g_bLibraryInitialized)
469     return;
470 
471   FXMEM_InitializePartitionAlloc();
472 
473   CFX_GEModule* pModule = CFX_GEModule::Get();
474   pModule->Init(cfg ? cfg->m_pUserFontPaths : nullptr);
475 
476   CPDF_ModuleMgr* pModuleMgr = CPDF_ModuleMgr::Get();
477   pModuleMgr->Init();
478 
479 #ifdef PDF_ENABLE_XFA
480   BC_Library_Init();
481 #endif  // PDF_ENABLE_XFA
482   if (cfg && cfg->version >= 2)
483     IJS_Runtime::Initialize(cfg->m_v8EmbedderSlot, cfg->m_pIsolate);
484 
485   g_bLibraryInitialized = true;
486 }
487 
FPDF_DestroyLibrary()488 FPDF_EXPORT void FPDF_CALLCONV FPDF_DestroyLibrary() {
489   if (!g_bLibraryInitialized)
490     return;
491 
492 #ifdef PDF_ENABLE_XFA
493   BC_Library_Destroy();
494 #endif  // PDF_ENABLE_XFA
495 
496   CPDF_ModuleMgr::Destroy();
497   CFX_GEModule::Destroy();
498 
499   IJS_Runtime::Destroy();
500 
501   g_bLibraryInitialized = false;
502 }
503 
504 #ifndef _WIN32
505 int g_LastError;
SetLastError(int err)506 void SetLastError(int err) {
507   g_LastError = err;
508 }
509 
GetLastError()510 int GetLastError() {
511   return g_LastError;
512 }
513 #endif  // _WIN32
514 
ProcessParseError(CPDF_Parser::Error err)515 void ProcessParseError(CPDF_Parser::Error err) {
516   uint32_t err_code = FPDF_ERR_SUCCESS;
517   // Translate FPDFAPI error code to FPDFVIEW error code
518   switch (err) {
519     case CPDF_Parser::SUCCESS:
520       err_code = FPDF_ERR_SUCCESS;
521       break;
522     case CPDF_Parser::FILE_ERROR:
523       err_code = FPDF_ERR_FILE;
524       break;
525     case CPDF_Parser::FORMAT_ERROR:
526       err_code = FPDF_ERR_FORMAT;
527       break;
528     case CPDF_Parser::PASSWORD_ERROR:
529       err_code = FPDF_ERR_PASSWORD;
530       break;
531     case CPDF_Parser::HANDLER_ERROR:
532       err_code = FPDF_ERR_SECURITY;
533       break;
534   }
535   SetLastError(err_code);
536 }
537 
FPDF_SetSandBoxPolicy(FPDF_DWORD policy,FPDF_BOOL enable)538 FPDF_EXPORT void FPDF_CALLCONV FPDF_SetSandBoxPolicy(FPDF_DWORD policy,
539                                                      FPDF_BOOL enable) {
540   return FSDK_SetSandBoxPolicy(policy, enable);
541 }
542 
543 #if defined(_WIN32)
544 #if defined(PDFIUM_PRINT_TEXT_WITH_GDI)
545 FPDF_EXPORT void FPDF_CALLCONV
FPDF_SetTypefaceAccessibleFunc(PDFiumEnsureTypefaceCharactersAccessible func)546 FPDF_SetTypefaceAccessibleFunc(PDFiumEnsureTypefaceCharactersAccessible func) {
547   g_pdfium_typeface_accessible_func = func;
548 }
549 
FPDF_SetPrintTextWithGDI(FPDF_BOOL use_gdi)550 FPDF_EXPORT void FPDF_CALLCONV FPDF_SetPrintTextWithGDI(FPDF_BOOL use_gdi) {
551   g_pdfium_print_text_with_gdi = !!use_gdi;
552 }
553 #endif  // PDFIUM_PRINT_TEXT_WITH_GDI
554 
555 FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDF_SetPrintPostscriptLevel(int postscript_level)556 FPDF_SetPrintPostscriptLevel(int postscript_level) {
557   return postscript_level != 1 && FPDF_SetPrintMode(postscript_level);
558 }
559 
FPDF_SetPrintMode(int mode)560 FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_SetPrintMode(int mode) {
561   if (mode < FPDF_PRINTMODE_EMF || mode > FPDF_PRINTMODE_POSTSCRIPT3)
562     return FALSE;
563   g_pdfium_print_mode = mode;
564   return TRUE;
565 }
566 #endif  // defined(_WIN32)
567 
568 FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV
FPDF_LoadDocument(FPDF_STRING file_path,FPDF_BYTESTRING password)569 FPDF_LoadDocument(FPDF_STRING file_path, FPDF_BYTESTRING password) {
570   // NOTE: the creation of the file needs to be by the embedder on the
571   // other side of this API.
572   return LoadDocumentImpl(IFX_SeekableReadStream::CreateFromFilename(file_path),
573                           password);
574 }
575 
FPDF_GetFormType(FPDF_DOCUMENT document)576 FPDF_EXPORT int FPDF_CALLCONV FPDF_GetFormType(FPDF_DOCUMENT document) {
577   if (!document)
578     return false;
579 
580   const CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
581   if (!pDoc)
582     return FORMTYPE_NONE;
583 
584   const CPDF_Dictionary* pRoot = pDoc->GetRoot();
585   if (!pRoot)
586     return FORMTYPE_NONE;
587 
588   CPDF_Dictionary* pAcroForm = pRoot->GetDictFor("AcroForm");
589   if (!pAcroForm)
590     return FORMTYPE_NONE;
591 
592   CPDF_Object* pXFA = pAcroForm->GetObjectFor("XFA");
593   if (!pXFA)
594     return FORMTYPE_ACRO_FORM;
595 
596   bool needsRendering = pRoot->GetBooleanFor("NeedsRendering", false);
597   return needsRendering ? FORMTYPE_XFA_FULL : FORMTYPE_XFA_FOREGROUND;
598 }
599 
600 #ifdef PDF_ENABLE_XFA
FPDF_LoadXFA(FPDF_DOCUMENT document)601 FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_LoadXFA(FPDF_DOCUMENT document) {
602   return document && static_cast<CPDFXFA_Context*>(document)->LoadXFADoc();
603 }
604 #endif  // PDF_ENABLE_XFA
605 
606 class CMemFile final : public IFX_SeekableReadStream {
607  public:
Create(const uint8_t * pBuf,FX_FILESIZE size)608   static RetainPtr<CMemFile> Create(const uint8_t* pBuf, FX_FILESIZE size) {
609     return RetainPtr<CMemFile>(new CMemFile(pBuf, size));
610   }
611 
GetSize()612   FX_FILESIZE GetSize() override { return m_size; }
ReadBlock(void * buffer,FX_FILESIZE offset,size_t size)613   bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override {
614     if (offset < 0)
615       return false;
616 
617     FX_SAFE_FILESIZE newPos = pdfium::base::checked_cast<FX_FILESIZE>(size);
618     newPos += offset;
619     if (!newPos.IsValid() || newPos.ValueOrDie() > m_size)
620       return false;
621 
622     memcpy(buffer, m_pBuf + offset, size);
623     return true;
624   }
625 
626  private:
CMemFile(const uint8_t * pBuf,FX_FILESIZE size)627   CMemFile(const uint8_t* pBuf, FX_FILESIZE size)
628       : m_pBuf(pBuf), m_size(size) {}
629 
630   const uint8_t* const m_pBuf;
631   const FX_FILESIZE m_size;
632 };
633 
634 FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV
FPDF_LoadMemDocument(const void * data_buf,int size,FPDF_BYTESTRING password)635 FPDF_LoadMemDocument(const void* data_buf, int size, FPDF_BYTESTRING password) {
636   return LoadDocumentImpl(
637       CMemFile::Create(static_cast<const uint8_t*>(data_buf), size), password);
638 }
639 
640 FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV
FPDF_LoadCustomDocument(FPDF_FILEACCESS * pFileAccess,FPDF_BYTESTRING password)641 FPDF_LoadCustomDocument(FPDF_FILEACCESS* pFileAccess,
642                         FPDF_BYTESTRING password) {
643   return LoadDocumentImpl(pdfium::MakeRetain<CPDF_CustomAccess>(pFileAccess),
644                           password);
645 }
646 
FPDF_GetFileVersion(FPDF_DOCUMENT doc,int * fileVersion)647 FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_GetFileVersion(FPDF_DOCUMENT doc,
648                                                         int* fileVersion) {
649   if (!fileVersion)
650     return false;
651 
652   *fileVersion = 0;
653   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(doc);
654   if (!pDoc)
655     return false;
656 
657   const CPDF_Parser* pParser = pDoc->GetParser();
658   if (!pParser)
659     return false;
660 
661   *fileVersion = pParser->GetFileVersion();
662   return true;
663 }
664 
665 // jabdelmalek: changed return type from uint32_t to build on Linux (and match
666 // header).
667 FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDF_GetDocPermissions(FPDF_DOCUMENT document)668 FPDF_GetDocPermissions(FPDF_DOCUMENT document) {
669   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
670   // https://bugs.chromium.org/p/pdfium/issues/detail?id=499
671   if (!pDoc) {
672 #ifndef PDF_ENABLE_XFA
673     return 0;
674 #else   // PDF_ENABLE_XFA
675     return 0xFFFFFFFF;
676 #endif  // PDF_ENABLE_XFA
677   }
678 
679   return pDoc->GetUserPermissions();
680 }
681 
682 FPDF_EXPORT int FPDF_CALLCONV
FPDF_GetSecurityHandlerRevision(FPDF_DOCUMENT document)683 FPDF_GetSecurityHandlerRevision(FPDF_DOCUMENT document) {
684   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
685   if (!pDoc || !pDoc->GetParser())
686     return -1;
687 
688   CPDF_Dictionary* pDict = pDoc->GetParser()->GetEncryptDict();
689   return pDict ? pDict->GetIntegerFor("R") : -1;
690 }
691 
FPDF_GetPageCount(FPDF_DOCUMENT document)692 FPDF_EXPORT int FPDF_CALLCONV FPDF_GetPageCount(FPDF_DOCUMENT document) {
693   UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
694   return pDoc ? pDoc->GetPageCount() : 0;
695 }
696 
FPDF_LoadPage(FPDF_DOCUMENT document,int page_index)697 FPDF_EXPORT FPDF_PAGE FPDF_CALLCONV FPDF_LoadPage(FPDF_DOCUMENT document,
698                                                   int page_index) {
699   UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
700   if (!pDoc)
701     return nullptr;
702 
703   if (page_index < 0 || page_index >= pDoc->GetPageCount())
704     return nullptr;
705 
706 #ifdef PDF_ENABLE_XFA
707   return pDoc->GetXFAPage(page_index).Leak();
708 #else   // PDF_ENABLE_XFA
709   CPDF_Dictionary* pDict = pDoc->GetPage(page_index);
710   if (!pDict)
711     return nullptr;
712 
713   CPDF_Page* pPage = new CPDF_Page(pDoc, pDict, true);
714   pPage->ParseContent();
715   return pPage;
716 #endif  // PDF_ENABLE_XFA
717 }
718 
FPDF_GetPageWidth(FPDF_PAGE page)719 FPDF_EXPORT double FPDF_CALLCONV FPDF_GetPageWidth(FPDF_PAGE page) {
720   UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
721   return pPage ? pPage->GetPageWidth() : 0.0;
722 }
723 
FPDF_GetPageHeight(FPDF_PAGE page)724 FPDF_EXPORT double FPDF_CALLCONV FPDF_GetPageHeight(FPDF_PAGE page) {
725   UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
726   return pPage ? pPage->GetPageHeight() : 0.0;
727 }
728 
FPDF_GetPageBoundingBox(FPDF_PAGE page,FS_RECTF * rect)729 FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_GetPageBoundingBox(FPDF_PAGE page,
730                                                             FS_RECTF* rect) {
731   if (!rect)
732     return false;
733 
734   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
735   if (!pPage)
736     return false;
737 
738   FSRECTFFromCFXFloatRect(pPage->GetPageBBox(), rect);
739   return true;
740 }
741 
742 #if defined(_WIN32)
743 namespace {
744 
745 const double kEpsilonSize = 0.01f;
746 
GetScaling(CPDF_Page * pPage,int size_x,int size_y,int rotate,double * scale_x,double * scale_y)747 void GetScaling(CPDF_Page* pPage,
748                 int size_x,
749                 int size_y,
750                 int rotate,
751                 double* scale_x,
752                 double* scale_y) {
753   ASSERT(pPage);
754   ASSERT(scale_x);
755   ASSERT(scale_y);
756   double page_width = pPage->GetPageWidth();
757   double page_height = pPage->GetPageHeight();
758   if (page_width < kEpsilonSize || page_height < kEpsilonSize)
759     return;
760 
761   if (rotate % 2 == 0) {
762     *scale_x = size_x / page_width;
763     *scale_y = size_y / page_height;
764   } else {
765     *scale_x = size_y / page_width;
766     *scale_y = size_x / page_height;
767   }
768 }
769 
GetMaskDimensionsAndOffsets(CPDF_Page * pPage,int start_x,int start_y,int size_x,int size_y,int rotate,const CFX_FloatRect & mask_box)770 FX_RECT GetMaskDimensionsAndOffsets(CPDF_Page* pPage,
771                                     int start_x,
772                                     int start_y,
773                                     int size_x,
774                                     int size_y,
775                                     int rotate,
776                                     const CFX_FloatRect& mask_box) {
777   double scale_x = 0.0f;
778   double scale_y = 0.0f;
779   GetScaling(pPage, size_x, size_y, rotate, &scale_x, &scale_y);
780   if (scale_x < kEpsilonSize || scale_y < kEpsilonSize)
781     return FX_RECT();
782 
783   // Compute sizes in page points. Round down to catch the entire bitmap.
784   int start_x_bm = static_cast<int>(mask_box.left * scale_x);
785   int start_y_bm = static_cast<int>(mask_box.bottom * scale_y);
786   int size_x_bm = static_cast<int>(mask_box.right * scale_x + 1.0f) -
787                   static_cast<int>(mask_box.left * scale_x);
788   int size_y_bm = static_cast<int>(mask_box.top * scale_y + 1.0f) -
789                   static_cast<int>(mask_box.bottom * scale_y);
790 
791   // Get page rotation
792   int page_rotation = pPage->GetPageRotation();
793 
794   // Compute offsets
795   int offset_x = 0;
796   int offset_y = 0;
797   if (size_x > size_y)
798     std::swap(size_x_bm, size_y_bm);
799 
800   switch ((rotate + page_rotation) % 4) {
801     case 0:
802       offset_x = start_x_bm + start_x;
803       offset_y = start_y + size_y - size_y_bm - start_y_bm;
804       break;
805     case 1:
806       offset_x = start_y_bm + start_x;
807       offset_y = start_x_bm + start_y;
808       break;
809     case 2:
810       offset_x = start_x + size_x - size_x_bm - start_x_bm;
811       offset_y = start_y_bm + start_y;
812       break;
813     case 3:
814       offset_x = start_x + size_x - size_x_bm - start_y_bm;
815       offset_y = start_y + size_y - size_y_bm - start_x_bm;
816       break;
817   }
818   return FX_RECT(offset_x, offset_y, offset_x + size_x_bm,
819                  offset_y + size_y_bm);
820 }
821 
822 // Get a bitmap of just the mask section defined by |mask_box| from a full page
823 // bitmap |pBitmap|.
GetMaskBitmap(CPDF_Page * pPage,int start_x,int start_y,int size_x,int size_y,int rotate,const RetainPtr<CFX_DIBitmap> & pSrc,const CFX_FloatRect & mask_box,FX_RECT * bitmap_area)824 RetainPtr<CFX_DIBitmap> GetMaskBitmap(CPDF_Page* pPage,
825                                       int start_x,
826                                       int start_y,
827                                       int size_x,
828                                       int size_y,
829                                       int rotate,
830                                       const RetainPtr<CFX_DIBitmap>& pSrc,
831                                       const CFX_FloatRect& mask_box,
832                                       FX_RECT* bitmap_area) {
833   ASSERT(bitmap_area);
834   *bitmap_area = GetMaskDimensionsAndOffsets(pPage, start_x, start_y, size_x,
835                                              size_y, rotate, mask_box);
836   if (bitmap_area->IsEmpty())
837     return nullptr;
838 
839   // Create a new bitmap to transfer part of the page bitmap to.
840   RetainPtr<CFX_DIBitmap> pDst = pdfium::MakeRetain<CFX_DIBitmap>();
841   pDst->Create(bitmap_area->Width(), bitmap_area->Height(), FXDIB_Argb);
842   pDst->Clear(0x00ffffff);
843   pDst->TransferBitmap(0, 0, bitmap_area->Width(), bitmap_area->Height(), pSrc,
844                        bitmap_area->left, bitmap_area->top);
845   return pDst;
846 }
847 
RenderBitmap(CFX_RenderDevice * device,const RetainPtr<CFX_DIBitmap> & pSrc,const FX_RECT & mask_area)848 void RenderBitmap(CFX_RenderDevice* device,
849                   const RetainPtr<CFX_DIBitmap>& pSrc,
850                   const FX_RECT& mask_area) {
851   int size_x_bm = mask_area.Width();
852   int size_y_bm = mask_area.Height();
853   if (size_x_bm == 0 || size_y_bm == 0)
854     return;
855 
856   // Create a new bitmap from the old one
857   RetainPtr<CFX_DIBitmap> pDst = pdfium::MakeRetain<CFX_DIBitmap>();
858   pDst->Create(size_x_bm, size_y_bm, FXDIB_Rgb32);
859   pDst->Clear(0xffffffff);
860   pDst->CompositeBitmap(0, 0, size_x_bm, size_y_bm, pSrc, 0, 0,
861                         FXDIB_BLEND_NORMAL, nullptr, false);
862 
863   if (device->GetDeviceCaps(FXDC_DEVICE_CLASS) == FXDC_PRINTER) {
864     device->StretchDIBits(pDst, mask_area.left, mask_area.top, size_x_bm,
865                           size_y_bm);
866   } else {
867     device->SetDIBits(pDst, mask_area.left, mask_area.top);
868   }
869 }
870 
871 }  // namespace
872 
FPDF_RenderPage(HDC dc,FPDF_PAGE page,int start_x,int start_y,int size_x,int size_y,int rotate,int flags)873 FPDF_EXPORT void FPDF_CALLCONV FPDF_RenderPage(HDC dc,
874                                                FPDF_PAGE page,
875                                                int start_x,
876                                                int start_y,
877                                                int size_x,
878                                                int size_y,
879                                                int rotate,
880                                                int flags) {
881   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
882   if (!pPage)
883     return;
884   pPage->SetRenderContext(pdfium::MakeUnique<CPDF_PageRenderContext>());
885   CPDF_PageRenderContext* pContext = pPage->GetRenderContext();
886 
887   RetainPtr<CFX_DIBitmap> pBitmap;
888   // Don't render the full page to bitmap for a mask unless there are a lot
889   // of masks. Full page bitmaps result in large spool sizes, so they should
890   // only be used when necessary. For large numbers of masks, rendering each
891   // individually is inefficient and unlikely to significantly improve spool
892   // size. TODO (rbpotter): Find out why this still breaks printing for some
893   // PDFs (see crbug.com/777837).
894   const bool bEnableImageMasks = false;
895   const bool bNewBitmap = pPage->BackgroundAlphaNeeded() ||
896                           (pPage->HasImageMask() && !bEnableImageMasks) ||
897                           pPage->GetMaskBoundingBoxes().size() > 100;
898   const bool bHasMask = pPage->HasImageMask() && !bNewBitmap;
899   if (bNewBitmap || bHasMask) {
900     pBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
901     pBitmap->Create(size_x, size_y, FXDIB_Argb);
902     pBitmap->Clear(0x00ffffff);
903     CFX_DefaultRenderDevice* pDevice = new CFX_DefaultRenderDevice;
904     pContext->m_pDevice = pdfium::WrapUnique(pDevice);
905     pDevice->Attach(pBitmap, false, nullptr, false);
906     if (bHasMask) {
907       pContext->m_pOptions = pdfium::MakeUnique<CPDF_RenderOptions>();
908       uint32_t option_flags = pContext->m_pOptions->GetFlags();
909       option_flags |= RENDER_BREAKFORMASKS;
910       pContext->m_pOptions->SetFlags(option_flags);
911     }
912   } else {
913     pContext->m_pDevice = pdfium::MakeUnique<CFX_WindowsRenderDevice>(dc);
914   }
915 
916   FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
917                          rotate, flags, true, nullptr);
918 
919   if (bHasMask) {
920     // Finish rendering the page to bitmap and copy the correct segments
921     // of the page to individual image mask bitmaps.
922     const std::vector<CFX_FloatRect>& mask_boxes =
923         pPage->GetMaskBoundingBoxes();
924     std::vector<FX_RECT> bitmap_areas(mask_boxes.size());
925     std::vector<RetainPtr<CFX_DIBitmap>> bitmaps(mask_boxes.size());
926     for (size_t i = 0; i < mask_boxes.size(); i++) {
927       bitmaps[i] =
928           GetMaskBitmap(pPage, start_x, start_y, size_x, size_y, rotate,
929                         pBitmap, mask_boxes[i], &bitmap_areas[i]);
930       pContext->m_pRenderer->Continue(nullptr);
931     }
932 
933     // Reset rendering context
934     pPage->SetRenderContext(nullptr);
935 
936     // Begin rendering to the printer. Add flag to indicate the renderer should
937     // pause after each image mask.
938     pPage->SetRenderContext(pdfium::MakeUnique<CPDF_PageRenderContext>());
939     pContext = pPage->GetRenderContext();
940     pContext->m_pDevice = pdfium::MakeUnique<CFX_WindowsRenderDevice>(dc);
941     pContext->m_pOptions = pdfium::MakeUnique<CPDF_RenderOptions>();
942 
943     uint32_t option_flags = pContext->m_pOptions->GetFlags();
944     option_flags |= RENDER_BREAKFORMASKS;
945     pContext->m_pOptions->SetFlags(option_flags);
946 
947     FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
948                            rotate, flags, true, nullptr);
949 
950     // Render masks
951     for (size_t i = 0; i < mask_boxes.size(); i++) {
952       // Render the bitmap for the mask and free the bitmap.
953       if (bitmaps[i]) {  // will be null if mask has zero area
954         RenderBitmap(pContext->m_pDevice.get(), bitmaps[i], bitmap_areas[i]);
955       }
956       // Render the next portion of page.
957       pContext->m_pRenderer->Continue(nullptr);
958     }
959   } else if (bNewBitmap) {
960     CFX_WindowsRenderDevice WinDC(dc);
961     if (WinDC.GetDeviceCaps(FXDC_DEVICE_CLASS) == FXDC_PRINTER) {
962       auto pDst = pdfium::MakeRetain<CFX_DIBitmap>();
963       int pitch = pBitmap->GetPitch();
964       pDst->Create(size_x, size_y, FXDIB_Rgb32);
965       memset(pDst->GetBuffer(), -1, pitch * size_y);
966       pDst->CompositeBitmap(0, 0, size_x, size_y, pBitmap, 0, 0,
967                             FXDIB_BLEND_NORMAL, nullptr, false);
968       WinDC.StretchDIBits(pDst, 0, 0, size_x, size_y);
969     } else {
970       WinDC.SetDIBits(pBitmap, 0, 0);
971     }
972   }
973 
974   pPage->SetRenderContext(nullptr);
975 }
976 #endif  // defined(_WIN32)
977 
FPDF_RenderPageBitmap(FPDF_BITMAP bitmap,FPDF_PAGE page,int start_x,int start_y,int size_x,int size_y,int rotate,int flags)978 FPDF_EXPORT void FPDF_CALLCONV FPDF_RenderPageBitmap(FPDF_BITMAP bitmap,
979                                                      FPDF_PAGE page,
980                                                      int start_x,
981                                                      int start_y,
982                                                      int size_x,
983                                                      int size_y,
984                                                      int rotate,
985                                                      int flags) {
986   if (!bitmap)
987     return;
988 
989   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
990   if (!pPage)
991     return;
992 
993   CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext;
994   pPage->SetRenderContext(pdfium::WrapUnique(pContext));
995 
996   CFX_DefaultRenderDevice* pDevice = new CFX_DefaultRenderDevice;
997   pContext->m_pDevice.reset(pDevice);
998 
999   RetainPtr<CFX_DIBitmap> pBitmap(CFXBitmapFromFPDFBitmap(bitmap));
1000   pDevice->Attach(pBitmap, !!(flags & FPDF_REVERSE_BYTE_ORDER), nullptr, false);
1001   FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y,
1002                          rotate, flags, true, nullptr);
1003 
1004 #ifdef _SKIA_SUPPORT_PATHS_
1005   pDevice->Flush(true);
1006   pBitmap->UnPreMultiply();
1007 #endif
1008   pPage->SetRenderContext(nullptr);
1009 }
1010 
1011 FPDF_EXPORT void FPDF_CALLCONV
FPDF_RenderPageBitmapWithMatrix(FPDF_BITMAP bitmap,FPDF_PAGE page,const FS_MATRIX * matrix,const FS_RECTF * clipping,int flags)1012 FPDF_RenderPageBitmapWithMatrix(FPDF_BITMAP bitmap,
1013                                 FPDF_PAGE page,
1014                                 const FS_MATRIX* matrix,
1015                                 const FS_RECTF* clipping,
1016                                 int flags) {
1017   if (!bitmap)
1018     return;
1019 
1020   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
1021   if (!pPage)
1022     return;
1023 
1024   CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext;
1025   pPage->SetRenderContext(pdfium::WrapUnique(pContext));
1026 
1027   CFX_DefaultRenderDevice* pDevice = new CFX_DefaultRenderDevice;
1028   pContext->m_pDevice.reset(pDevice);
1029 
1030   RetainPtr<CFX_DIBitmap> pBitmap(CFXBitmapFromFPDFBitmap(bitmap));
1031   pDevice->Attach(pBitmap, !!(flags & FPDF_REVERSE_BYTE_ORDER), nullptr, false);
1032 
1033   CFX_FloatRect clipping_rect;
1034   if (clipping)
1035     clipping_rect = CFXFloatRectFromFSRECTF(*clipping);
1036   FX_RECT clip_rect = clipping_rect.ToFxRect();
1037 
1038   CFX_Matrix transform_matrix = pPage->GetDisplayMatrix(
1039       0, 0, pPage->GetPageWidth(), pPage->GetPageHeight(), 0);
1040 
1041   if (matrix) {
1042     transform_matrix.Concat(CFX_Matrix(matrix->a, matrix->b, matrix->c,
1043                                        matrix->d, matrix->e, matrix->f));
1044   }
1045   RenderPageImpl(pContext, pPage, transform_matrix, clip_rect, flags, true,
1046                  nullptr);
1047 
1048   pPage->SetRenderContext(nullptr);
1049 }
1050 
1051 #ifdef _SKIA_SUPPORT_
FPDF_RenderPageSkp(FPDF_PAGE page,int size_x,int size_y)1052 FPDF_EXPORT FPDF_RECORDER FPDF_CALLCONV FPDF_RenderPageSkp(FPDF_PAGE page,
1053                                                            int size_x,
1054                                                            int size_y) {
1055   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
1056   if (!pPage)
1057     return nullptr;
1058 
1059   CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext;
1060   pPage->SetRenderContext(pdfium::WrapUnique(pContext));
1061   CFX_DefaultRenderDevice* skDevice = new CFX_DefaultRenderDevice;
1062   FPDF_RECORDER recorder = skDevice->CreateRecorder(size_x, size_y);
1063   pContext->m_pDevice.reset(skDevice);
1064   FPDF_RenderPage_Retail(pContext, page, 0, 0, size_x, size_y, 0, 0, true,
1065                          nullptr);
1066   pPage->SetRenderContext(nullptr);
1067   return recorder;
1068 }
1069 #endif
1070 
FPDF_ClosePage(FPDF_PAGE page)1071 FPDF_EXPORT void FPDF_CALLCONV FPDF_ClosePage(FPDF_PAGE page) {
1072   UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
1073   if (!page)
1074     return;
1075 #ifdef PDF_ENABLE_XFA
1076   // Take it back across the API and throw it away.
1077   RetainPtr<CPDFXFA_Page>().Unleak(pPage);
1078 #else   // PDF_ENABLE_XFA
1079   CPDFSDK_PageView* pPageView =
1080       static_cast<CPDFSDK_PageView*>(pPage->GetView());
1081   if (pPageView) {
1082     // We're already destroying the pageview, so bail early.
1083     if (pPageView->IsBeingDestroyed())
1084       return;
1085 
1086     if (pPageView->IsLocked()) {
1087       pPageView->TakePageOwnership();
1088       return;
1089     }
1090 
1091     bool owned = pPageView->OwnsPage();
1092     // This will delete the |pPageView| object. We must cleanup the PageView
1093     // first because it will attempt to reset the View on the |pPage| during
1094     // destruction.
1095     pPageView->GetFormFillEnv()->RemovePageView(pPage);
1096     // If the page was owned then the pageview will have deleted the page.
1097     if (owned)
1098       return;
1099   }
1100   delete pPage;
1101 #endif  // PDF_ENABLE_XFA
1102 }
1103 
FPDF_CloseDocument(FPDF_DOCUMENT document)1104 FPDF_EXPORT void FPDF_CALLCONV FPDF_CloseDocument(FPDF_DOCUMENT document) {
1105   delete UnderlyingFromFPDFDocument(document);
1106 }
1107 
FPDF_GetLastError()1108 FPDF_EXPORT unsigned long FPDF_CALLCONV FPDF_GetLastError() {
1109   return GetLastError();
1110 }
1111 
FPDF_DeviceToPage(FPDF_PAGE page,int start_x,int start_y,int size_x,int size_y,int rotate,int device_x,int device_y,double * page_x,double * page_y)1112 FPDF_EXPORT void FPDF_CALLCONV FPDF_DeviceToPage(FPDF_PAGE page,
1113                                                  int start_x,
1114                                                  int start_y,
1115                                                  int size_x,
1116                                                  int size_y,
1117                                                  int rotate,
1118                                                  int device_x,
1119                                                  int device_y,
1120                                                  double* page_x,
1121                                                  double* page_y) {
1122   if (!page || !page_x || !page_y)
1123     return;
1124   UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
1125 #ifdef PDF_ENABLE_XFA
1126   pPage->DeviceToPage(start_x, start_y, size_x, size_y, rotate, device_x,
1127                       device_y, page_x, page_y);
1128 #else   // PDF_ENABLE_XFA
1129   CFX_Matrix page2device =
1130       pPage->GetDisplayMatrix(start_x, start_y, size_x, size_y, rotate);
1131 
1132   CFX_PointF pos = page2device.GetInverse().Transform(
1133       CFX_PointF(static_cast<float>(device_x), static_cast<float>(device_y)));
1134 
1135   *page_x = pos.x;
1136   *page_y = pos.y;
1137 #endif  // PDF_ENABLE_XFA
1138 }
1139 
FPDF_PageToDevice(FPDF_PAGE page,int start_x,int start_y,int size_x,int size_y,int rotate,double page_x,double page_y,int * device_x,int * device_y)1140 FPDF_EXPORT void FPDF_CALLCONV FPDF_PageToDevice(FPDF_PAGE page,
1141                                                  int start_x,
1142                                                  int start_y,
1143                                                  int size_x,
1144                                                  int size_y,
1145                                                  int rotate,
1146                                                  double page_x,
1147                                                  double page_y,
1148                                                  int* device_x,
1149                                                  int* device_y) {
1150   if (!device_x || !device_y)
1151     return;
1152   UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page);
1153   if (!pPage)
1154     return;
1155 #ifdef PDF_ENABLE_XFA
1156   pPage->PageToDevice(start_x, start_y, size_x, size_y, rotate, page_x, page_y,
1157                       device_x, device_y);
1158 #else   // PDF_ENABLE_XFA
1159   CFX_Matrix page2device =
1160       pPage->GetDisplayMatrix(start_x, start_y, size_x, size_y, rotate);
1161   CFX_PointF pos = page2device.Transform(
1162       CFX_PointF(static_cast<float>(page_x), static_cast<float>(page_y)));
1163 
1164   *device_x = FXSYS_round(pos.x);
1165   *device_y = FXSYS_round(pos.y);
1166 #endif  // PDF_ENABLE_XFA
1167 }
1168 
FPDFBitmap_Create(int width,int height,int alpha)1169 FPDF_EXPORT FPDF_BITMAP FPDF_CALLCONV FPDFBitmap_Create(int width,
1170                                                         int height,
1171                                                         int alpha) {
1172   auto pBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
1173   if (!pBitmap->Create(width, height, alpha ? FXDIB_Argb : FXDIB_Rgb32))
1174     return nullptr;
1175 
1176   return pBitmap.Leak();
1177 }
1178 
FPDFBitmap_CreateEx(int width,int height,int format,void * first_scan,int stride)1179 FPDF_EXPORT FPDF_BITMAP FPDF_CALLCONV FPDFBitmap_CreateEx(int width,
1180                                                           int height,
1181                                                           int format,
1182                                                           void* first_scan,
1183                                                           int stride) {
1184   FXDIB_Format fx_format;
1185   switch (format) {
1186     case FPDFBitmap_Gray:
1187       fx_format = FXDIB_8bppRgb;
1188       break;
1189     case FPDFBitmap_BGR:
1190       fx_format = FXDIB_Rgb;
1191       break;
1192     case FPDFBitmap_BGRx:
1193       fx_format = FXDIB_Rgb32;
1194       break;
1195     case FPDFBitmap_BGRA:
1196       fx_format = FXDIB_Argb;
1197       break;
1198     default:
1199       return nullptr;
1200   }
1201   auto pBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
1202   pBitmap->Create(width, height, fx_format, static_cast<uint8_t*>(first_scan),
1203                   stride);
1204   return pBitmap.Leak();
1205 }
1206 
FPDFBitmap_GetFormat(FPDF_BITMAP bitmap)1207 FPDF_EXPORT int FPDF_CALLCONV FPDFBitmap_GetFormat(FPDF_BITMAP bitmap) {
1208   if (!bitmap)
1209     return FPDFBitmap_Unknown;
1210 
1211   FXDIB_Format format = CFXBitmapFromFPDFBitmap(bitmap)->GetFormat();
1212   switch (format) {
1213     case FXDIB_8bppRgb:
1214     case FXDIB_8bppMask:
1215       return FPDFBitmap_Gray;
1216     case FXDIB_Rgb:
1217       return FPDFBitmap_BGR;
1218     case FXDIB_Rgb32:
1219       return FPDFBitmap_BGRx;
1220     case FXDIB_Argb:
1221       return FPDFBitmap_BGRA;
1222     default:
1223       return FPDFBitmap_Unknown;
1224   }
1225 }
1226 
FPDFBitmap_FillRect(FPDF_BITMAP bitmap,int left,int top,int width,int height,FPDF_DWORD color)1227 FPDF_EXPORT void FPDF_CALLCONV FPDFBitmap_FillRect(FPDF_BITMAP bitmap,
1228                                                    int left,
1229                                                    int top,
1230                                                    int width,
1231                                                    int height,
1232                                                    FPDF_DWORD color) {
1233   if (!bitmap)
1234     return;
1235 
1236   CFX_DefaultRenderDevice device;
1237   RetainPtr<CFX_DIBitmap> pBitmap(CFXBitmapFromFPDFBitmap(bitmap));
1238   device.Attach(pBitmap, false, nullptr, false);
1239   if (!pBitmap->HasAlpha())
1240     color |= 0xFF000000;
1241   FX_RECT rect(left, top, left + width, top + height);
1242   device.FillRect(&rect, color);
1243 }
1244 
FPDFBitmap_GetBuffer(FPDF_BITMAP bitmap)1245 FPDF_EXPORT void* FPDF_CALLCONV FPDFBitmap_GetBuffer(FPDF_BITMAP bitmap) {
1246   return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetBuffer() : nullptr;
1247 }
1248 
FPDFBitmap_GetWidth(FPDF_BITMAP bitmap)1249 FPDF_EXPORT int FPDF_CALLCONV FPDFBitmap_GetWidth(FPDF_BITMAP bitmap) {
1250   return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetWidth() : 0;
1251 }
1252 
FPDFBitmap_GetHeight(FPDF_BITMAP bitmap)1253 FPDF_EXPORT int FPDF_CALLCONV FPDFBitmap_GetHeight(FPDF_BITMAP bitmap) {
1254   return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetHeight() : 0;
1255 }
1256 
FPDFBitmap_GetStride(FPDF_BITMAP bitmap)1257 FPDF_EXPORT int FPDF_CALLCONV FPDFBitmap_GetStride(FPDF_BITMAP bitmap) {
1258   return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetPitch() : 0;
1259 }
1260 
FPDFBitmap_Destroy(FPDF_BITMAP bitmap)1261 FPDF_EXPORT void FPDF_CALLCONV FPDFBitmap_Destroy(FPDF_BITMAP bitmap) {
1262   RetainPtr<CFX_DIBitmap> destroyer;
1263   destroyer.Unleak(CFXBitmapFromFPDFBitmap(bitmap));
1264 }
1265 
FPDF_RenderPage_Retail(CPDF_PageRenderContext * pContext,FPDF_PAGE page,int start_x,int start_y,int size_x,int size_y,int rotate,int flags,bool bNeedToRestore,IFSDK_PAUSE_Adapter * pause)1266 void FPDF_RenderPage_Retail(CPDF_PageRenderContext* pContext,
1267                             FPDF_PAGE page,
1268                             int start_x,
1269                             int start_y,
1270                             int size_x,
1271                             int size_y,
1272                             int rotate,
1273                             int flags,
1274                             bool bNeedToRestore,
1275                             IFSDK_PAUSE_Adapter* pause) {
1276   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
1277   if (!pPage)
1278     return;
1279 
1280   RenderPageImpl(pContext, pPage, pPage->GetDisplayMatrix(
1281                                       start_x, start_y, size_x, size_y, rotate),
1282                  FX_RECT(start_x, start_y, start_x + size_x, start_y + size_y),
1283                  flags, bNeedToRestore, pause);
1284 }
1285 
FPDF_GetPageSizeByIndex(FPDF_DOCUMENT document,int page_index,double * width,double * height)1286 FPDF_EXPORT int FPDF_CALLCONV FPDF_GetPageSizeByIndex(FPDF_DOCUMENT document,
1287                                                       int page_index,
1288                                                       double* width,
1289                                                       double* height) {
1290   UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document);
1291   if (!pDoc)
1292     return false;
1293 
1294 #ifdef PDF_ENABLE_XFA
1295   int count = pDoc->GetPageCount();
1296   if (page_index < 0 || page_index >= count)
1297     return false;
1298   RetainPtr<CPDFXFA_Page> pPage = pDoc->GetXFAPage(page_index);
1299   if (!pPage)
1300     return false;
1301   *width = pPage->GetPageWidth();
1302   *height = pPage->GetPageHeight();
1303 #else   // PDF_ENABLE_XFA
1304   CPDF_Dictionary* pDict = pDoc->GetPage(page_index);
1305   if (!pDict)
1306     return false;
1307 
1308   CPDF_Page page(pDoc, pDict, true);
1309   *width = page.GetPageWidth();
1310   *height = page.GetPageHeight();
1311 #endif  // PDF_ENABLE_XFA
1312 
1313   return true;
1314 }
1315 
1316 FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDF_VIEWERREF_GetPrintScaling(FPDF_DOCUMENT document)1317 FPDF_VIEWERREF_GetPrintScaling(FPDF_DOCUMENT document) {
1318   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
1319   if (!pDoc)
1320     return true;
1321   CPDF_ViewerPreferences viewRef(pDoc);
1322   return viewRef.PrintScaling();
1323 }
1324 
1325 FPDF_EXPORT int FPDF_CALLCONV
FPDF_VIEWERREF_GetNumCopies(FPDF_DOCUMENT document)1326 FPDF_VIEWERREF_GetNumCopies(FPDF_DOCUMENT document) {
1327   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
1328   if (!pDoc)
1329     return 1;
1330   CPDF_ViewerPreferences viewRef(pDoc);
1331   return viewRef.NumCopies();
1332 }
1333 
1334 FPDF_EXPORT FPDF_PAGERANGE FPDF_CALLCONV
FPDF_VIEWERREF_GetPrintPageRange(FPDF_DOCUMENT document)1335 FPDF_VIEWERREF_GetPrintPageRange(FPDF_DOCUMENT document) {
1336   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
1337   if (!pDoc)
1338     return nullptr;
1339   CPDF_ViewerPreferences viewRef(pDoc);
1340   return viewRef.PrintPageRange();
1341 }
1342 
1343 FPDF_EXPORT FPDF_DUPLEXTYPE FPDF_CALLCONV
FPDF_VIEWERREF_GetDuplex(FPDF_DOCUMENT document)1344 FPDF_VIEWERREF_GetDuplex(FPDF_DOCUMENT document) {
1345   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
1346   if (!pDoc)
1347     return DuplexUndefined;
1348   CPDF_ViewerPreferences viewRef(pDoc);
1349   ByteString duplex = viewRef.Duplex();
1350   if ("Simplex" == duplex)
1351     return Simplex;
1352   if ("DuplexFlipShortEdge" == duplex)
1353     return DuplexFlipShortEdge;
1354   if ("DuplexFlipLongEdge" == duplex)
1355     return DuplexFlipLongEdge;
1356   return DuplexUndefined;
1357 }
1358 
1359 FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDF_VIEWERREF_GetName(FPDF_DOCUMENT document,FPDF_BYTESTRING key,char * buffer,unsigned long length)1360 FPDF_VIEWERREF_GetName(FPDF_DOCUMENT document,
1361                        FPDF_BYTESTRING key,
1362                        char* buffer,
1363                        unsigned long length) {
1364   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
1365   if (!pDoc)
1366     return 0;
1367 
1368   CPDF_ViewerPreferences viewRef(pDoc);
1369   ByteString bsVal;
1370   if (!viewRef.GenericName(key, &bsVal))
1371     return 0;
1372 
1373   unsigned long dwStringLen = bsVal.GetLength() + 1;
1374   if (buffer && length >= dwStringLen)
1375     memcpy(buffer, bsVal.c_str(), dwStringLen);
1376   return dwStringLen;
1377 }
1378 
1379 FPDF_EXPORT FPDF_DWORD FPDF_CALLCONV
FPDF_CountNamedDests(FPDF_DOCUMENT document)1380 FPDF_CountNamedDests(FPDF_DOCUMENT document) {
1381   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
1382   if (!pDoc)
1383     return 0;
1384 
1385   const CPDF_Dictionary* pRoot = pDoc->GetRoot();
1386   if (!pRoot)
1387     return 0;
1388 
1389   CPDF_NameTree nameTree(pDoc, "Dests");
1390   pdfium::base::CheckedNumeric<FPDF_DWORD> count = nameTree.GetCount();
1391   CPDF_Dictionary* pDest = pRoot->GetDictFor("Dests");
1392   if (pDest)
1393     count += pDest->GetCount();
1394 
1395   if (!count.IsValid())
1396     return 0;
1397 
1398   return count.ValueOrDie();
1399 }
1400 
1401 FPDF_EXPORT FPDF_DEST FPDF_CALLCONV
FPDF_GetNamedDestByName(FPDF_DOCUMENT document,FPDF_BYTESTRING name)1402 FPDF_GetNamedDestByName(FPDF_DOCUMENT document, FPDF_BYTESTRING name) {
1403   if (!name || name[0] == 0)
1404     return nullptr;
1405 
1406   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
1407   if (!pDoc)
1408     return nullptr;
1409 
1410   CPDF_NameTree name_tree(pDoc, "Dests");
1411   return name_tree.LookupNamedDest(pDoc, PDF_DecodeText(ByteString(name)));
1412 }
1413 
1414 #ifdef PDF_ENABLE_XFA
FPDF_BStr_Init(FPDF_BSTR * str)1415 FPDF_EXPORT FPDF_RESULT FPDF_CALLCONV FPDF_BStr_Init(FPDF_BSTR* str) {
1416   if (!str)
1417     return -1;
1418 
1419   memset(str, 0, sizeof(FPDF_BSTR));
1420   return 0;
1421 }
1422 
FPDF_BStr_Set(FPDF_BSTR * str,FPDF_LPCSTR bstr,int length)1423 FPDF_EXPORT FPDF_RESULT FPDF_CALLCONV FPDF_BStr_Set(FPDF_BSTR* str,
1424                                                     FPDF_LPCSTR bstr,
1425                                                     int length) {
1426   if (!str || !bstr || !length)
1427     return -1;
1428 
1429   if (length == -1)
1430     length = strlen(bstr);
1431 
1432   if (length == 0) {
1433     FPDF_BStr_Clear(str);
1434     return 0;
1435   }
1436 
1437   if (str->str && str->len < length)
1438     str->str = FX_Realloc(char, str->str, length + 1);
1439   else if (!str->str)
1440     str->str = FX_Alloc(char, length + 1);
1441 
1442   str->str[length] = 0;
1443   memcpy(str->str, bstr, length);
1444   str->len = length;
1445 
1446   return 0;
1447 }
1448 
FPDF_BStr_Clear(FPDF_BSTR * str)1449 FPDF_EXPORT FPDF_RESULT FPDF_CALLCONV FPDF_BStr_Clear(FPDF_BSTR* str) {
1450   if (!str)
1451     return -1;
1452 
1453   if (str->str) {
1454     FX_Free(str->str);
1455     str->str = nullptr;
1456   }
1457   str->len = 0;
1458   return 0;
1459 }
1460 #endif  // PDF_ENABLE_XFA
1461 
FPDF_GetNamedDest(FPDF_DOCUMENT document,int index,void * buffer,long * buflen)1462 FPDF_EXPORT FPDF_DEST FPDF_CALLCONV FPDF_GetNamedDest(FPDF_DOCUMENT document,
1463                                                       int index,
1464                                                       void* buffer,
1465                                                       long* buflen) {
1466   if (!buffer)
1467     *buflen = 0;
1468 
1469   if (index < 0)
1470     return nullptr;
1471 
1472   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
1473   if (!pDoc)
1474     return nullptr;
1475 
1476   const CPDF_Dictionary* pRoot = pDoc->GetRoot();
1477   if (!pRoot)
1478     return nullptr;
1479 
1480   CPDF_Object* pDestObj = nullptr;
1481   WideString wsName;
1482   CPDF_NameTree nameTree(pDoc, "Dests");
1483   int count = nameTree.GetCount();
1484   if (index >= count) {
1485     CPDF_Dictionary* pDest = pRoot->GetDictFor("Dests");
1486     if (!pDest)
1487       return nullptr;
1488 
1489     pdfium::base::CheckedNumeric<int> checked_count = count;
1490     checked_count += pDest->GetCount();
1491     if (!checked_count.IsValid() || index >= checked_count.ValueOrDie())
1492       return nullptr;
1493 
1494     index -= count;
1495     int i = 0;
1496     ByteString bsName;
1497     for (const auto& it : *pDest) {
1498       bsName = it.first;
1499       pDestObj = it.second.get();
1500       if (!pDestObj)
1501         continue;
1502       if (i == index)
1503         break;
1504       i++;
1505     }
1506     wsName = PDF_DecodeText(bsName);
1507   } else {
1508     pDestObj = nameTree.LookupValueAndName(index, &wsName);
1509   }
1510   if (!pDestObj)
1511     return nullptr;
1512   if (CPDF_Dictionary* pDict = pDestObj->AsDictionary()) {
1513     pDestObj = pDict->GetArrayFor("D");
1514     if (!pDestObj)
1515       return nullptr;
1516   }
1517   if (!pDestObj->IsArray())
1518     return nullptr;
1519 
1520   ByteString utf16Name = wsName.UTF16LE_Encode();
1521   int len = utf16Name.GetLength();
1522   if (!buffer) {
1523     *buflen = len;
1524   } else if (len <= *buflen) {
1525     memcpy(buffer, utf16Name.c_str(), len);
1526     *buflen = len;
1527   } else {
1528     *buflen = -1;
1529   }
1530   return (FPDF_DEST)pDestObj;
1531 }
1532