// Copyright 2014 PDFium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com #include "public/fpdfview.h" #include <memory> #include <utility> #include <vector> #include "core/fpdfapi/cpdf_modulemgr.h" #include "core/fpdfapi/cpdf_pagerendercontext.h" #include "core/fpdfapi/page/cpdf_image.h" #include "core/fpdfapi/page/cpdf_imageobject.h" #include "core/fpdfapi/page/cpdf_page.h" #include "core/fpdfapi/page/cpdf_pageobject.h" #include "core/fpdfapi/page/cpdf_pathobject.h" #include "core/fpdfapi/parser/cpdf_array.h" #include "core/fpdfapi/parser/cpdf_dictionary.h" #include "core/fpdfapi/parser/cpdf_document.h" #include "core/fpdfapi/parser/fpdf_parser_decode.h" #include "core/fpdfapi/render/cpdf_progressiverenderer.h" #include "core/fpdfapi/render/cpdf_renderoptions.h" #include "core/fpdfdoc/cpdf_annotlist.h" #include "core/fpdfdoc/cpdf_nametree.h" #include "core/fpdfdoc/cpdf_occontext.h" #include "core/fpdfdoc/cpdf_viewerpreferences.h" #include "core/fxcodec/fx_codec.h" #include "core/fxcrt/fx_memory.h" #include "core/fxcrt/fx_safe_types.h" #include "core/fxge/cfx_defaultrenderdevice.h" #include "core/fxge/cfx_gemodule.h" #include "fpdfsdk/cpdfsdk_formfillenvironment.h" #include "fpdfsdk/cpdfsdk_pageview.h" #include "fpdfsdk/fsdk_define.h" #include "fpdfsdk/fsdk_pauseadapter.h" #include "fpdfsdk/javascript/ijs_runtime.h" #include "public/fpdf_edit.h" #include "public/fpdf_ext.h" #include "public/fpdf_progressive.h" #include "third_party/base/allocator/partition_allocator/partition_alloc.h" #include "third_party/base/numerics/safe_conversions_impl.h" #include "third_party/base/ptr_util.h" #ifdef PDF_ENABLE_XFA #include "fpdfsdk/fpdfxfa/cpdfxfa_context.h" #include "fpdfsdk/fpdfxfa/cpdfxfa_page.h" #include "fpdfsdk/fpdfxfa/cxfa_fwladaptertimermgr.h" #include "fxbarcode/BC_Library.h" #include "public/fpdf_formfill.h" #endif // PDF_ENABLE_XFA #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_ #include "core/fxge/cfx_windowsrenderdevice.h" // These checks are here because core/ and public/ cannot depend on each other. static_assert(WindowsPrintMode::kModeEmf == FPDF_PRINTMODE_EMF, "WindowsPrintMode::kModeEmf value mismatch"); static_assert(WindowsPrintMode::kModeTextOnly == FPDF_PRINTMODE_TEXTONLY, "WindowsPrintMode::kModeTextOnly value mismatch"); static_assert(WindowsPrintMode::kModePostScript2 == FPDF_PRINTMODE_POSTSCRIPT2, "WindowsPrintMode::kModePostScript2 value mismatch"); static_assert(WindowsPrintMode::kModePostScript3 == FPDF_PRINTMODE_POSTSCRIPT3, "WindowsPrintMode::kModePostScript3 value mismatch"); #endif namespace { bool g_bLibraryInitialized = false; void RenderPageImpl(CPDF_PageRenderContext* pContext, CPDF_Page* pPage, const CFX_Matrix& matrix, const FX_RECT& clipping_rect, int flags, bool bNeedToRestore, IFSDK_PAUSE_Adapter* pause) { if (!pContext->m_pOptions) pContext->m_pOptions = pdfium::MakeUnique<CPDF_RenderOptions>(); if (flags & FPDF_LCD_TEXT) pContext->m_pOptions->m_Flags |= RENDER_CLEARTYPE; else pContext->m_pOptions->m_Flags &= ~RENDER_CLEARTYPE; if (flags & FPDF_NO_NATIVETEXT) pContext->m_pOptions->m_Flags |= RENDER_NO_NATIVETEXT; if (flags & FPDF_RENDER_LIMITEDIMAGECACHE) pContext->m_pOptions->m_Flags |= RENDER_LIMITEDIMAGECACHE; if (flags & FPDF_RENDER_FORCEHALFTONE) pContext->m_pOptions->m_Flags |= RENDER_FORCE_HALFTONE; #ifndef PDF_ENABLE_XFA if (flags & FPDF_RENDER_NO_SMOOTHTEXT) pContext->m_pOptions->m_Flags |= RENDER_NOTEXTSMOOTH; if (flags & FPDF_RENDER_NO_SMOOTHIMAGE) pContext->m_pOptions->m_Flags |= RENDER_NOIMAGESMOOTH; if (flags & FPDF_RENDER_NO_SMOOTHPATH) pContext->m_pOptions->m_Flags |= RENDER_NOPATHSMOOTH; #endif // PDF_ENABLE_XFA // Grayscale output if (flags & FPDF_GRAYSCALE) pContext->m_pOptions->m_ColorMode = CPDF_RenderOptions::kGray; const CPDF_OCContext::UsageType usage = (flags & FPDF_PRINTING) ? CPDF_OCContext::Print : CPDF_OCContext::View; pContext->m_pOptions->m_pOCContext = pdfium::MakeRetain<CPDF_OCContext>(pPage->m_pDocument.Get(), usage); pContext->m_pDevice->SaveState(); pContext->m_pDevice->SetClip_Rect(clipping_rect); pContext->m_pContext = pdfium::MakeUnique<CPDF_RenderContext>(pPage); pContext->m_pContext->AppendLayer(pPage, &matrix); if (flags & FPDF_ANNOT) { pContext->m_pAnnots = pdfium::MakeUnique<CPDF_AnnotList>(pPage); bool bPrinting = pContext->m_pDevice->GetDeviceClass() != FXDC_DISPLAY; pContext->m_pAnnots->DisplayAnnots(pPage, pContext->m_pContext.get(), bPrinting, &matrix, false, nullptr); } pContext->m_pRenderer = pdfium::MakeUnique<CPDF_ProgressiveRenderer>( pContext->m_pContext.get(), pContext->m_pDevice.get(), pContext->m_pOptions.get()); pContext->m_pRenderer->Start(pause); if (bNeedToRestore) pContext->m_pDevice->RestoreState(false); } class CPDF_CustomAccess final : public IFX_SeekableReadStream { public: template <typename T, typename... Args> friend CFX_RetainPtr<T> pdfium::MakeRetain(Args&&... args); // IFX_SeekableReadStream FX_FILESIZE GetSize() override; bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override; private: explicit CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess); FPDF_FILEACCESS m_FileAccess; }; CPDF_CustomAccess::CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess) : m_FileAccess(*pFileAccess) {} FX_FILESIZE CPDF_CustomAccess::GetSize() { return m_FileAccess.m_FileLen; } bool CPDF_CustomAccess::ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) { if (offset < 0) return false; FX_SAFE_FILESIZE newPos = pdfium::base::checked_cast<FX_FILESIZE>(size); newPos += offset; if (!newPos.IsValid() || newPos.ValueOrDie() > static_cast<FX_FILESIZE>(m_FileAccess.m_FileLen)) { return false; } return !!m_FileAccess.m_GetBlock(m_FileAccess.m_Param, offset, static_cast<uint8_t*>(buffer), size); } #ifdef PDF_ENABLE_XFA class CFPDF_FileStream : public IFX_SeekableStream { public: template <typename T, typename... Args> friend CFX_RetainPtr<T> pdfium::MakeRetain(Args&&... args); ~CFPDF_FileStream() override; // IFX_SeekableStream: FX_FILESIZE GetSize() override; bool IsEOF() override; FX_FILESIZE GetPosition() override; bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override; size_t ReadBlock(void* buffer, size_t size) override; bool WriteBlock(const void* buffer, FX_FILESIZE offset, size_t size) override; bool Flush() override; void SetPosition(FX_FILESIZE pos) { m_nCurPos = pos; } protected: explicit CFPDF_FileStream(FPDF_FILEHANDLER* pFS); FPDF_FILEHANDLER* m_pFS; FX_FILESIZE m_nCurPos; }; CFPDF_FileStream::CFPDF_FileStream(FPDF_FILEHANDLER* pFS) { m_pFS = pFS; m_nCurPos = 0; } CFPDF_FileStream::~CFPDF_FileStream() { if (m_pFS && m_pFS->Release) m_pFS->Release(m_pFS->clientData); } FX_FILESIZE CFPDF_FileStream::GetSize() { if (m_pFS && m_pFS->GetSize) return (FX_FILESIZE)m_pFS->GetSize(m_pFS->clientData); return 0; } bool CFPDF_FileStream::IsEOF() { return m_nCurPos >= GetSize(); } FX_FILESIZE CFPDF_FileStream::GetPosition() { return m_nCurPos; } bool CFPDF_FileStream::ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) { if (!buffer || !size || !m_pFS->ReadBlock) return false; if (m_pFS->ReadBlock(m_pFS->clientData, (FPDF_DWORD)offset, buffer, (FPDF_DWORD)size) == 0) { m_nCurPos = offset + size; return true; } return false; } size_t CFPDF_FileStream::ReadBlock(void* buffer, size_t size) { if (!buffer || !size || !m_pFS->ReadBlock) return 0; FX_FILESIZE nSize = GetSize(); if (m_nCurPos >= nSize) return 0; FX_FILESIZE dwAvail = nSize - m_nCurPos; if (dwAvail < (FX_FILESIZE)size) size = (size_t)dwAvail; if (m_pFS->ReadBlock(m_pFS->clientData, (FPDF_DWORD)m_nCurPos, buffer, (FPDF_DWORD)size) == 0) { m_nCurPos += size; return size; } return 0; } bool CFPDF_FileStream::WriteBlock(const void* buffer, FX_FILESIZE offset, size_t size) { if (!m_pFS || !m_pFS->WriteBlock) return false; if (m_pFS->WriteBlock(m_pFS->clientData, (FPDF_DWORD)offset, buffer, (FPDF_DWORD)size) == 0) { m_nCurPos = offset + size; return true; } return false; } bool CFPDF_FileStream::Flush() { if (!m_pFS || !m_pFS->Flush) return true; return m_pFS->Flush(m_pFS->clientData) == 0; } #endif // PDF_ENABLE_XFA } // namespace UnderlyingDocumentType* UnderlyingFromFPDFDocument(FPDF_DOCUMENT doc) { return static_cast<UnderlyingDocumentType*>(doc); } FPDF_DOCUMENT FPDFDocumentFromUnderlying(UnderlyingDocumentType* doc) { return static_cast<FPDF_DOCUMENT>(doc); } UnderlyingPageType* UnderlyingFromFPDFPage(FPDF_PAGE page) { return static_cast<UnderlyingPageType*>(page); } CPDF_Document* CPDFDocumentFromFPDFDocument(FPDF_DOCUMENT doc) { #ifdef PDF_ENABLE_XFA return doc ? UnderlyingFromFPDFDocument(doc)->GetPDFDoc() : nullptr; #else // PDF_ENABLE_XFA return UnderlyingFromFPDFDocument(doc); #endif // PDF_ENABLE_XFA } FPDF_DOCUMENT FPDFDocumentFromCPDFDocument(CPDF_Document* doc) { #ifdef PDF_ENABLE_XFA return doc ? FPDFDocumentFromUnderlying( new CPDFXFA_Context(pdfium::WrapUnique(doc))) : nullptr; #else // PDF_ENABLE_XFA return FPDFDocumentFromUnderlying(doc); #endif // PDF_ENABLE_XFA } CPDF_Page* CPDFPageFromFPDFPage(FPDF_PAGE page) { #ifdef PDF_ENABLE_XFA return page ? UnderlyingFromFPDFPage(page)->GetPDFPage() : nullptr; #else // PDF_ENABLE_XFA return UnderlyingFromFPDFPage(page); #endif // PDF_ENABLE_XFA } CPDF_PathObject* CPDFPathObjectFromFPDFPageObject(FPDF_PAGEOBJECT page_object) { return static_cast<CPDF_PathObject*>(page_object); } CPDF_PageObject* CPDFPageObjectFromFPDFPageObject(FPDF_PAGEOBJECT page_object) { return static_cast<CPDF_PageObject*>(page_object); } CPDF_Object* CPDFObjectFromFPDFAttachment(FPDF_ATTACHMENT attachment) { return static_cast<CPDF_Object*>(attachment); } CFX_ByteString CFXByteStringFromFPDFWideString(FPDF_WIDESTRING wide_string) { return CFX_WideString::FromUTF16LE(wide_string, CFX_WideString::WStringLength(wide_string)) .UTF8Encode(); } CFX_DIBitmap* CFXBitmapFromFPDFBitmap(FPDF_BITMAP bitmap) { return static_cast<CFX_DIBitmap*>(bitmap); } unsigned long Utf16EncodeMaybeCopyAndReturnLength(const CFX_WideString& text, void* buffer, unsigned long buflen) { CFX_ByteString encodedText = text.UTF16LE_Encode(); unsigned long len = encodedText.GetLength(); if (buffer && len <= buflen) memcpy(buffer, encodedText.c_str(), len); return len; } CFX_RetainPtr<IFX_SeekableReadStream> MakeSeekableReadStream( FPDF_FILEACCESS* pFileAccess) { return pdfium::MakeRetain<CPDF_CustomAccess>(pFileAccess); } #ifdef PDF_ENABLE_XFA CFX_RetainPtr<IFX_SeekableStream> MakeSeekableStream( FPDF_FILEHANDLER* pFilehandler) { return pdfium::MakeRetain<CFPDF_FileStream>(pFilehandler); } #endif // PDF_ENABLE_XFA // 0 bit: FPDF_POLICY_MACHINETIME_ACCESS static uint32_t foxit_sandbox_policy = 0xFFFFFFFF; void FSDK_SetSandBoxPolicy(FPDF_DWORD policy, FPDF_BOOL enable) { switch (policy) { case FPDF_POLICY_MACHINETIME_ACCESS: { if (enable) foxit_sandbox_policy |= 0x01; else foxit_sandbox_policy &= 0xFFFFFFFE; } break; default: break; } } FPDF_BOOL FSDK_IsSandBoxPolicyEnabled(FPDF_DWORD policy) { switch (policy) { case FPDF_POLICY_MACHINETIME_ACCESS: return !!(foxit_sandbox_policy & 0x01); default: return false; } } DLLEXPORT void STDCALL FPDF_InitLibrary() { FPDF_InitLibraryWithConfig(nullptr); } DLLEXPORT void STDCALL FPDF_InitLibraryWithConfig(const FPDF_LIBRARY_CONFIG* cfg) { if (g_bLibraryInitialized) return; FXMEM_InitializePartitionAlloc(); CFX_GEModule* pModule = CFX_GEModule::Get(); pModule->Init(cfg ? cfg->m_pUserFontPaths : nullptr); CPDF_ModuleMgr* pModuleMgr = CPDF_ModuleMgr::Get(); pModuleMgr->Init(); #ifdef PDF_ENABLE_XFA FXJSE_Initialize(); BC_Library_Init(); #endif // PDF_ENABLE_XFA if (cfg && cfg->version >= 2) IJS_Runtime::Initialize(cfg->m_v8EmbedderSlot, cfg->m_pIsolate); g_bLibraryInitialized = true; } DLLEXPORT void STDCALL FPDF_DestroyLibrary() { if (!g_bLibraryInitialized) return; #ifdef PDF_ENABLE_XFA BC_Library_Destroy(); FXJSE_Finalize(); #endif // PDF_ENABLE_XFA CPDF_ModuleMgr::Destroy(); CFX_GEModule::Destroy(); IJS_Runtime::Destroy(); g_bLibraryInitialized = false; } #ifndef _WIN32 int g_LastError; void SetLastError(int err) { g_LastError = err; } int GetLastError() { return g_LastError; } #endif // _WIN32 void ProcessParseError(CPDF_Parser::Error err) { uint32_t err_code = FPDF_ERR_SUCCESS; // Translate FPDFAPI error code to FPDFVIEW error code switch (err) { case CPDF_Parser::SUCCESS: err_code = FPDF_ERR_SUCCESS; break; case CPDF_Parser::FILE_ERROR: err_code = FPDF_ERR_FILE; break; case CPDF_Parser::FORMAT_ERROR: err_code = FPDF_ERR_FORMAT; break; case CPDF_Parser::PASSWORD_ERROR: err_code = FPDF_ERR_PASSWORD; break; case CPDF_Parser::HANDLER_ERROR: err_code = FPDF_ERR_SECURITY; break; } SetLastError(err_code); } DLLEXPORT void STDCALL FPDF_SetSandBoxPolicy(FPDF_DWORD policy, FPDF_BOOL enable) { return FSDK_SetSandBoxPolicy(policy, enable); } #if defined(_WIN32) #if defined(PDFIUM_PRINT_TEXT_WITH_GDI) DLLEXPORT void STDCALL FPDF_SetTypefaceAccessibleFunc(PDFiumEnsureTypefaceCharactersAccessible func) { g_pdfium_typeface_accessible_func = func; } DLLEXPORT void STDCALL FPDF_SetPrintTextWithGDI(FPDF_BOOL use_gdi) { g_pdfium_print_text_with_gdi = !!use_gdi; } #endif // PDFIUM_PRINT_TEXT_WITH_GDI DLLEXPORT FPDF_BOOL STDCALL FPDF_SetPrintPostscriptLevel(int postscript_level) { return postscript_level != 1 && FPDF_SetPrintMode(postscript_level); } DLLEXPORT FPDF_BOOL STDCALL FPDF_SetPrintMode(int mode) { if (mode < FPDF_PRINTMODE_EMF || mode > FPDF_PRINTMODE_POSTSCRIPT3) return FALSE; g_pdfium_print_mode = mode; return TRUE; } #endif // defined(_WIN32) DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadDocument(FPDF_STRING file_path, FPDF_BYTESTRING password) { // NOTE: the creation of the file needs to be by the embedder on the // other side of this API. CFX_RetainPtr<IFX_SeekableReadStream> pFileAccess = IFX_SeekableReadStream::CreateFromFilename((const char*)file_path); if (!pFileAccess) return nullptr; auto pParser = pdfium::MakeUnique<CPDF_Parser>(); pParser->SetPassword(password); auto pDocument = pdfium::MakeUnique<CPDF_Document>(std::move(pParser)); CPDF_Parser::Error error = pDocument->GetParser()->StartParse(pFileAccess, pDocument.get()); if (error != CPDF_Parser::SUCCESS) { ProcessParseError(error); return nullptr; } CheckUnSupportError(pDocument.get(), error); return FPDFDocumentFromCPDFDocument(pDocument.release()); } #ifdef PDF_ENABLE_XFA DLLEXPORT FPDF_BOOL STDCALL FPDF_HasXFAField(FPDF_DOCUMENT document, int* docType) { if (!document) return false; CPDF_Document* pdfDoc = (static_cast<CPDFXFA_Context*>(document))->GetPDFDoc(); if (!pdfDoc) return false; CPDF_Dictionary* pRoot = pdfDoc->GetRoot(); if (!pRoot) return false; CPDF_Dictionary* pAcroForm = pRoot->GetDictFor("AcroForm"); if (!pAcroForm) return false; CPDF_Object* pXFA = pAcroForm->GetObjectFor("XFA"); if (!pXFA) return false; bool bDynamicXFA = pRoot->GetBooleanFor("NeedsRendering", false); *docType = bDynamicXFA ? DOCTYPE_DYNAMIC_XFA : DOCTYPE_STATIC_XFA; return true; } DLLEXPORT FPDF_BOOL STDCALL FPDF_LoadXFA(FPDF_DOCUMENT document) { return document && (static_cast<CPDFXFA_Context*>(document))->LoadXFADoc(); } #endif // PDF_ENABLE_XFA class CMemFile final : public IFX_SeekableReadStream { public: static CFX_RetainPtr<CMemFile> Create(uint8_t* pBuf, FX_FILESIZE size) { return CFX_RetainPtr<CMemFile>(new CMemFile(pBuf, size)); } FX_FILESIZE GetSize() override { return m_size; } bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override { if (offset < 0) return false; FX_SAFE_FILESIZE newPos = pdfium::base::checked_cast<FX_FILESIZE>(size); newPos += offset; if (!newPos.IsValid() || newPos.ValueOrDie() > m_size) return false; memcpy(buffer, m_pBuf + offset, size); return true; } private: CMemFile(uint8_t* pBuf, FX_FILESIZE size) : m_pBuf(pBuf), m_size(size) {} uint8_t* const m_pBuf; const FX_FILESIZE m_size; }; DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadMemDocument(const void* data_buf, int size, FPDF_BYTESTRING password) { CFX_RetainPtr<CMemFile> pMemFile = CMemFile::Create((uint8_t*)data_buf, size); auto pParser = pdfium::MakeUnique<CPDF_Parser>(); pParser->SetPassword(password); auto pDocument = pdfium::MakeUnique<CPDF_Document>(std::move(pParser)); CPDF_Parser::Error error = pDocument->GetParser()->StartParse(pMemFile, pDocument.get()); if (error != CPDF_Parser::SUCCESS) { ProcessParseError(error); return nullptr; } CheckUnSupportError(pDocument.get(), error); return FPDFDocumentFromCPDFDocument(pDocument.release()); } DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadCustomDocument(FPDF_FILEACCESS* pFileAccess, FPDF_BYTESTRING password) { auto pFile = pdfium::MakeRetain<CPDF_CustomAccess>(pFileAccess); auto pParser = pdfium::MakeUnique<CPDF_Parser>(); pParser->SetPassword(password); auto pDocument = pdfium::MakeUnique<CPDF_Document>(std::move(pParser)); CPDF_Parser::Error error = pDocument->GetParser()->StartParse(pFile, pDocument.get()); if (error != CPDF_Parser::SUCCESS) { ProcessParseError(error); return nullptr; } CheckUnSupportError(pDocument.get(), error); return FPDFDocumentFromCPDFDocument(pDocument.release()); } DLLEXPORT FPDF_BOOL STDCALL FPDF_GetFileVersion(FPDF_DOCUMENT doc, int* fileVersion) { if (!fileVersion) return false; *fileVersion = 0; CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(doc); if (!pDoc) return false; CPDF_Parser* pParser = pDoc->GetParser(); if (!pParser) return false; *fileVersion = pParser->GetFileVersion(); return true; } // jabdelmalek: changed return type from uint32_t to build on Linux (and match // header). DLLEXPORT unsigned long STDCALL FPDF_GetDocPermissions(FPDF_DOCUMENT document) { CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); // https://bugs.chromium.org/p/pdfium/issues/detail?id=499 if (!pDoc) { #ifndef PDF_ENABLE_XFA return 0; #else // PDF_ENABLE_XFA return 0xFFFFFFFF; #endif // PDF_ENABLE_XFA } return pDoc->GetUserPermissions(); } DLLEXPORT int STDCALL FPDF_GetSecurityHandlerRevision(FPDF_DOCUMENT document) { CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); if (!pDoc || !pDoc->GetParser()) return -1; CPDF_Dictionary* pDict = pDoc->GetParser()->GetEncryptDict(); return pDict ? pDict->GetIntegerFor("R") : -1; } DLLEXPORT int STDCALL FPDF_GetPageCount(FPDF_DOCUMENT document) { UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document); return pDoc ? pDoc->GetPageCount() : 0; } DLLEXPORT FPDF_PAGE STDCALL FPDF_LoadPage(FPDF_DOCUMENT document, int page_index) { UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document); if (!pDoc) return nullptr; if (page_index < 0 || page_index >= pDoc->GetPageCount()) return nullptr; #ifdef PDF_ENABLE_XFA return pDoc->GetXFAPage(page_index).Leak(); #else // PDF_ENABLE_XFA CPDF_Dictionary* pDict = pDoc->GetPage(page_index); if (!pDict) return nullptr; CPDF_Page* pPage = new CPDF_Page(pDoc, pDict, true); pPage->ParseContent(); return pPage; #endif // PDF_ENABLE_XFA } DLLEXPORT double STDCALL FPDF_GetPageWidth(FPDF_PAGE page) { UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page); return pPage ? pPage->GetPageWidth() : 0.0; } DLLEXPORT double STDCALL FPDF_GetPageHeight(FPDF_PAGE page) { UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page); return pPage ? pPage->GetPageHeight() : 0.0; } #if defined(_WIN32) namespace { const double kEpsilonSize = 0.01f; void GetScaling(CPDF_Page* pPage, int size_x, int size_y, int rotate, double* scale_x, double* scale_y) { ASSERT(pPage); ASSERT(scale_x); ASSERT(scale_y); double page_width = pPage->GetPageWidth(); double page_height = pPage->GetPageHeight(); if (page_width < kEpsilonSize || page_height < kEpsilonSize) return; if (rotate % 2 == 0) { *scale_x = size_x / page_width; *scale_y = size_y / page_height; } else { *scale_x = size_y / page_width; *scale_y = size_x / page_height; } } FX_RECT GetMaskDimensionsAndOffsets(CPDF_Page* pPage, int start_x, int start_y, int size_x, int size_y, int rotate, const CFX_FloatRect& mask_box) { double scale_x = 0.0f; double scale_y = 0.0f; GetScaling(pPage, size_x, size_y, rotate, &scale_x, &scale_y); if (scale_x < kEpsilonSize || scale_y < kEpsilonSize) return FX_RECT(); // Compute sizes in page points. Round down to catch the entire bitmap. int start_x_bm = static_cast<int>(mask_box.left * scale_x); int start_y_bm = static_cast<int>(mask_box.bottom * scale_y); int size_x_bm = static_cast<int>(mask_box.right * scale_x + 1.0f) - static_cast<int>(mask_box.left * scale_x); int size_y_bm = static_cast<int>(mask_box.top * scale_y + 1.0f) - static_cast<int>(mask_box.bottom * scale_y); // Get page rotation int page_rotation = pPage->GetPageRotation(); // Compute offsets int offset_x = 0; int offset_y = 0; switch ((rotate + page_rotation) % 4) { case 0: offset_x = start_x_bm + start_x; offset_y = start_y + size_y - size_y_bm - start_y_bm; break; case 1: offset_x = start_y_bm + start_x; offset_y = start_x_bm + start_y; break; case 2: offset_x = start_x + size_x - size_x_bm - start_x_bm; offset_y = start_y_bm + start_y; break; case 3: offset_x = start_x + size_x - size_x_bm - start_y_bm; offset_y = start_y + size_y - size_y_bm - start_x_bm; break; } return FX_RECT(offset_x, offset_y, offset_x + size_x_bm, offset_y + size_y_bm); } // Get a bitmap of just the mask section defined by |mask_box| from a full page // bitmap |pBitmap|. CFX_RetainPtr<CFX_DIBitmap> GetMaskBitmap(CPDF_Page* pPage, int start_x, int start_y, int size_x, int size_y, int rotate, CFX_RetainPtr<CFX_DIBitmap>& pSrc, const CFX_FloatRect& mask_box, FX_RECT* bitmap_area) { ASSERT(bitmap_area); *bitmap_area = GetMaskDimensionsAndOffsets(pPage, start_x, start_y, size_x, size_y, rotate, mask_box); if (bitmap_area->IsEmpty()) return nullptr; // Create a new bitmap to transfer part of the page bitmap to. CFX_RetainPtr<CFX_DIBitmap> pDst = pdfium::MakeRetain<CFX_DIBitmap>(); pDst->Create(bitmap_area->Width(), bitmap_area->Height(), FXDIB_Argb); pDst->Clear(0x00ffffff); pDst->TransferBitmap(0, 0, bitmap_area->Width(), bitmap_area->Height(), pSrc, bitmap_area->left, bitmap_area->top); return pDst; } void RenderBitmap(CFX_RenderDevice* device, const CFX_RetainPtr<CFX_DIBitmap>& pSrc, const FX_RECT& mask_area) { int size_x_bm = mask_area.Width(); int size_y_bm = mask_area.Height(); if (size_x_bm == 0 || size_y_bm == 0) return; // Create a new bitmap from the old one CFX_RetainPtr<CFX_DIBitmap> pDst = pdfium::MakeRetain<CFX_DIBitmap>(); pDst->Create(size_x_bm, size_y_bm, FXDIB_Rgb32); pDst->Clear(0xffffffff); pDst->CompositeBitmap(0, 0, size_x_bm, size_y_bm, pSrc, 0, 0, FXDIB_BLEND_NORMAL, nullptr, false); if (device->GetDeviceCaps(FXDC_DEVICE_CLASS) == FXDC_PRINTER) { device->StretchDIBitsWithFlagsAndBlend(pDst, mask_area.left, mask_area.top, size_x_bm, size_y_bm, 0, FXDIB_BLEND_NORMAL); } else { device->SetDIBits(pDst, mask_area.left, mask_area.top); } } } // namespace DLLEXPORT void STDCALL FPDF_RenderPage(HDC dc, FPDF_PAGE page, int start_x, int start_y, int size_x, int size_y, int rotate, int flags) { CPDF_Page* pPage = CPDFPageFromFPDFPage(page); if (!pPage) return; pPage->SetRenderContext(pdfium::MakeUnique<CPDF_PageRenderContext>()); CPDF_PageRenderContext* pContext = pPage->GetRenderContext(); CFX_RetainPtr<CFX_DIBitmap> pBitmap; // Don't render the full page to bitmap for a mask unless there are a lot // of masks. Full page bitmaps result in large spool sizes, so they should // only be used when necessary. For large numbers of masks, rendering each // individually is inefficient and unlikely to significantly improve spool // size. const bool bNewBitmap = pPage->BackgroundAlphaNeeded() || (pPage->HasImageMask() && pPage->GetMaskBoundingBoxes().size() > 100); const bool bHasMask = pPage->HasImageMask() && !bNewBitmap; if (bNewBitmap || bHasMask) { pBitmap = pdfium::MakeRetain<CFX_DIBitmap>(); pBitmap->Create(size_x, size_y, FXDIB_Argb); pBitmap->Clear(0x00ffffff); CFX_DefaultRenderDevice* pDevice = new CFX_DefaultRenderDevice; pContext->m_pDevice = pdfium::WrapUnique(pDevice); pDevice->Attach(pBitmap, false, nullptr, false); if (bHasMask) { pContext->m_pOptions = pdfium::MakeUnique<CPDF_RenderOptions>(); pContext->m_pOptions->m_Flags |= RENDER_BREAKFORMASKS; } } else { pContext->m_pDevice = pdfium::MakeUnique<CFX_WindowsRenderDevice>(dc); } FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y, rotate, flags, true, nullptr); if (bHasMask) { // Finish rendering the page to bitmap and copy the correct segments // of the page to individual image mask bitmaps. const std::vector<CFX_FloatRect>& mask_boxes = pPage->GetMaskBoundingBoxes(); std::vector<FX_RECT> bitmap_areas(mask_boxes.size()); std::vector<CFX_RetainPtr<CFX_DIBitmap>> bitmaps(mask_boxes.size()); for (size_t i = 0; i < mask_boxes.size(); i++) { bitmaps[i] = GetMaskBitmap(pPage, start_x, start_y, size_x, size_y, rotate, pBitmap, mask_boxes[i], &bitmap_areas[i]); pContext->m_pRenderer->Continue(nullptr); } // Reset rendering context pPage->SetRenderContext(nullptr); // Begin rendering to the printer. Add flag to indicate the renderer should // pause after each image mask. pPage->SetRenderContext(pdfium::MakeUnique<CPDF_PageRenderContext>()); pContext = pPage->GetRenderContext(); pContext->m_pDevice = pdfium::MakeUnique<CFX_WindowsRenderDevice>(dc); pContext->m_pOptions = pdfium::MakeUnique<CPDF_RenderOptions>(); pContext->m_pOptions->m_Flags |= RENDER_BREAKFORMASKS; FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y, rotate, flags, true, nullptr); // Render masks for (size_t i = 0; i < mask_boxes.size(); i++) { // Render the bitmap for the mask and free the bitmap. if (bitmaps[i]) { // will be null if mask has zero area RenderBitmap(pContext->m_pDevice.get(), bitmaps[i], bitmap_areas[i]); } // Render the next portion of page. pContext->m_pRenderer->Continue(nullptr); } } else if (bNewBitmap) { CFX_WindowsRenderDevice WinDC(dc); if (WinDC.GetDeviceCaps(FXDC_DEVICE_CLASS) == FXDC_PRINTER) { auto pDst = pdfium::MakeRetain<CFX_DIBitmap>(); int pitch = pBitmap->GetPitch(); pDst->Create(size_x, size_y, FXDIB_Rgb32); memset(pDst->GetBuffer(), -1, pitch * size_y); pDst->CompositeBitmap(0, 0, size_x, size_y, pBitmap, 0, 0, FXDIB_BLEND_NORMAL, nullptr, false); WinDC.StretchDIBits(pDst, 0, 0, size_x, size_y); } else { WinDC.SetDIBits(pBitmap, 0, 0); } } pPage->SetRenderContext(nullptr); } #endif // defined(_WIN32) DLLEXPORT void STDCALL FPDF_RenderPageBitmap(FPDF_BITMAP bitmap, FPDF_PAGE page, int start_x, int start_y, int size_x, int size_y, int rotate, int flags) { if (!bitmap) return; CPDF_Page* pPage = CPDFPageFromFPDFPage(page); if (!pPage) return; CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext; pPage->SetRenderContext(pdfium::WrapUnique(pContext)); CFX_DefaultRenderDevice* pDevice = new CFX_DefaultRenderDevice; pContext->m_pDevice.reset(pDevice); CFX_RetainPtr<CFX_DIBitmap> pBitmap(CFXBitmapFromFPDFBitmap(bitmap)); pDevice->Attach(pBitmap, !!(flags & FPDF_REVERSE_BYTE_ORDER), nullptr, false); FPDF_RenderPage_Retail(pContext, page, start_x, start_y, size_x, size_y, rotate, flags, true, nullptr); #ifdef _SKIA_SUPPORT_PATHS_ pDevice->Flush(); pBitmap->UnPreMultiply(); #endif pPage->SetRenderContext(nullptr); } DLLEXPORT void STDCALL FPDF_RenderPageBitmapWithMatrix(FPDF_BITMAP bitmap, FPDF_PAGE page, const FS_MATRIX* matrix, const FS_RECTF* clipping, int flags) { if (!bitmap) return; CPDF_Page* pPage = CPDFPageFromFPDFPage(page); if (!pPage) return; CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext; pPage->SetRenderContext(pdfium::WrapUnique(pContext)); CFX_DefaultRenderDevice* pDevice = new CFX_DefaultRenderDevice; pContext->m_pDevice.reset(pDevice); CFX_RetainPtr<CFX_DIBitmap> pBitmap(CFXBitmapFromFPDFBitmap(bitmap)); pDevice->Attach(pBitmap, !!(flags & FPDF_REVERSE_BYTE_ORDER), nullptr, false); CFX_Matrix transform_matrix = pPage->GetPageMatrix(); if (matrix) { transform_matrix.Concat(CFX_Matrix(matrix->a, matrix->b, matrix->c, matrix->d, matrix->e, matrix->f)); } CFX_FloatRect clipping_rect; if (clipping) { clipping_rect.left = clipping->left; clipping_rect.bottom = clipping->bottom; clipping_rect.right = clipping->right; clipping_rect.top = clipping->top; } RenderPageImpl(pContext, pPage, transform_matrix, clipping_rect.ToFxRect(), flags, true, nullptr); pPage->SetRenderContext(nullptr); } #ifdef _SKIA_SUPPORT_ DLLEXPORT FPDF_RECORDER STDCALL FPDF_RenderPageSkp(FPDF_PAGE page, int size_x, int size_y) { CPDF_Page* pPage = CPDFPageFromFPDFPage(page); if (!pPage) return nullptr; CPDF_PageRenderContext* pContext = new CPDF_PageRenderContext; pPage->SetRenderContext(pdfium::WrapUnique(pContext)); CFX_DefaultRenderDevice* skDevice = new CFX_DefaultRenderDevice; FPDF_RECORDER recorder = skDevice->CreateRecorder(size_x, size_y); pContext->m_pDevice.reset(skDevice); FPDF_RenderPage_Retail(pContext, page, 0, 0, size_x, size_y, 0, 0, true, nullptr); pPage->SetRenderContext(nullptr); return recorder; } #endif DLLEXPORT void STDCALL FPDF_ClosePage(FPDF_PAGE page) { UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page); if (!page) return; #ifdef PDF_ENABLE_XFA // Take it back across the API and throw it away. CFX_RetainPtr<CPDFXFA_Page>().Unleak(pPage); #else // PDF_ENABLE_XFA CPDFSDK_PageView* pPageView = static_cast<CPDFSDK_PageView*>(pPage->GetView()); if (pPageView) { // We're already destroying the pageview, so bail early. if (pPageView->IsBeingDestroyed()) return; if (pPageView->IsLocked()) { pPageView->TakePageOwnership(); return; } bool owned = pPageView->OwnsPage(); // This will delete the |pPageView| object. We must cleanup the PageView // first because it will attempt to reset the View on the |pPage| during // destruction. pPageView->GetFormFillEnv()->RemovePageView(pPage); // If the page was owned then the pageview will have deleted the page. if (owned) return; } delete pPage; #endif // PDF_ENABLE_XFA } DLLEXPORT void STDCALL FPDF_CloseDocument(FPDF_DOCUMENT document) { delete UnderlyingFromFPDFDocument(document); } DLLEXPORT unsigned long STDCALL FPDF_GetLastError() { return GetLastError(); } DLLEXPORT void STDCALL FPDF_DeviceToPage(FPDF_PAGE page, int start_x, int start_y, int size_x, int size_y, int rotate, int device_x, int device_y, double* page_x, double* page_y) { if (!page || !page_x || !page_y) return; UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page); #ifdef PDF_ENABLE_XFA pPage->DeviceToPage(start_x, start_y, size_x, size_y, rotate, device_x, device_y, page_x, page_y); #else // PDF_ENABLE_XFA CFX_Matrix page2device = pPage->GetDisplayMatrix(start_x, start_y, size_x, size_y, rotate); CFX_PointF pos = page2device.GetInverse().Transform( CFX_PointF(static_cast<float>(device_x), static_cast<float>(device_y))); *page_x = pos.x; *page_y = pos.y; #endif // PDF_ENABLE_XFA } DLLEXPORT void STDCALL FPDF_PageToDevice(FPDF_PAGE page, int start_x, int start_y, int size_x, int size_y, int rotate, double page_x, double page_y, int* device_x, int* device_y) { if (!device_x || !device_y) return; UnderlyingPageType* pPage = UnderlyingFromFPDFPage(page); if (!pPage) return; #ifdef PDF_ENABLE_XFA pPage->PageToDevice(start_x, start_y, size_x, size_y, rotate, page_x, page_y, device_x, device_y); #else // PDF_ENABLE_XFA CFX_Matrix page2device = pPage->GetDisplayMatrix(start_x, start_y, size_x, size_y, rotate); CFX_PointF pos = page2device.Transform( CFX_PointF(static_cast<float>(page_x), static_cast<float>(page_y))); *device_x = FXSYS_round(pos.x); *device_y = FXSYS_round(pos.y); #endif // PDF_ENABLE_XFA } DLLEXPORT FPDF_BITMAP STDCALL FPDFBitmap_Create(int width, int height, int alpha) { auto pBitmap = pdfium::MakeRetain<CFX_DIBitmap>(); if (!pBitmap->Create(width, height, alpha ? FXDIB_Argb : FXDIB_Rgb32)) return nullptr; return pBitmap.Leak(); } DLLEXPORT FPDF_BITMAP STDCALL FPDFBitmap_CreateEx(int width, int height, int format, void* first_scan, int stride) { FXDIB_Format fx_format; switch (format) { case FPDFBitmap_Gray: fx_format = FXDIB_8bppRgb; break; case FPDFBitmap_BGR: fx_format = FXDIB_Rgb; break; case FPDFBitmap_BGRx: fx_format = FXDIB_Rgb32; break; case FPDFBitmap_BGRA: fx_format = FXDIB_Argb; break; default: return nullptr; } auto pBitmap = pdfium::MakeRetain<CFX_DIBitmap>(); pBitmap->Create(width, height, fx_format, (uint8_t*)first_scan, stride); return pBitmap.Leak(); } DLLEXPORT void STDCALL FPDFBitmap_FillRect(FPDF_BITMAP bitmap, int left, int top, int width, int height, FPDF_DWORD color) { if (!bitmap) return; CFX_DefaultRenderDevice device; CFX_RetainPtr<CFX_DIBitmap> pBitmap(CFXBitmapFromFPDFBitmap(bitmap)); device.Attach(pBitmap, false, nullptr, false); if (!pBitmap->HasAlpha()) color |= 0xFF000000; FX_RECT rect(left, top, left + width, top + height); device.FillRect(&rect, color); } DLLEXPORT void* STDCALL FPDFBitmap_GetBuffer(FPDF_BITMAP bitmap) { return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetBuffer() : nullptr; } DLLEXPORT int STDCALL FPDFBitmap_GetWidth(FPDF_BITMAP bitmap) { return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetWidth() : 0; } DLLEXPORT int STDCALL FPDFBitmap_GetHeight(FPDF_BITMAP bitmap) { return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetHeight() : 0; } DLLEXPORT int STDCALL FPDFBitmap_GetStride(FPDF_BITMAP bitmap) { return bitmap ? CFXBitmapFromFPDFBitmap(bitmap)->GetPitch() : 0; } DLLEXPORT void STDCALL FPDFBitmap_Destroy(FPDF_BITMAP bitmap) { CFX_RetainPtr<CFX_DIBitmap> destroyer; destroyer.Unleak(CFXBitmapFromFPDFBitmap(bitmap)); } void 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) { CPDF_Page* pPage = CPDFPageFromFPDFPage(page); if (!pPage) return; RenderPageImpl(pContext, pPage, pPage->GetDisplayMatrix( start_x, start_y, size_x, size_y, rotate), FX_RECT(start_x, start_y, start_x + size_x, start_y + size_y), flags, bNeedToRestore, pause); } DLLEXPORT int STDCALL FPDF_GetPageSizeByIndex(FPDF_DOCUMENT document, int page_index, double* width, double* height) { UnderlyingDocumentType* pDoc = UnderlyingFromFPDFDocument(document); if (!pDoc) return false; #ifdef PDF_ENABLE_XFA int count = pDoc->GetPageCount(); if (page_index < 0 || page_index >= count) return false; CFX_RetainPtr<CPDFXFA_Page> pPage = pDoc->GetXFAPage(page_index); if (!pPage) return false; *width = pPage->GetPageWidth(); *height = pPage->GetPageHeight(); #else // PDF_ENABLE_XFA CPDF_Dictionary* pDict = pDoc->GetPage(page_index); if (!pDict) return false; CPDF_Page page(pDoc, pDict, true); *width = page.GetPageWidth(); *height = page.GetPageHeight(); #endif // PDF_ENABLE_XFA return true; } DLLEXPORT FPDF_BOOL STDCALL FPDF_VIEWERREF_GetPrintScaling(FPDF_DOCUMENT document) { CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); if (!pDoc) return true; CPDF_ViewerPreferences viewRef(pDoc); return viewRef.PrintScaling(); } DLLEXPORT int STDCALL FPDF_VIEWERREF_GetNumCopies(FPDF_DOCUMENT document) { CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); if (!pDoc) return 1; CPDF_ViewerPreferences viewRef(pDoc); return viewRef.NumCopies(); } DLLEXPORT FPDF_PAGERANGE STDCALL FPDF_VIEWERREF_GetPrintPageRange(FPDF_DOCUMENT document) { CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); if (!pDoc) return nullptr; CPDF_ViewerPreferences viewRef(pDoc); return viewRef.PrintPageRange(); } DLLEXPORT FPDF_DUPLEXTYPE STDCALL FPDF_VIEWERREF_GetDuplex(FPDF_DOCUMENT document) { CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); if (!pDoc) return DuplexUndefined; CPDF_ViewerPreferences viewRef(pDoc); CFX_ByteString duplex = viewRef.Duplex(); if ("Simplex" == duplex) return Simplex; if ("DuplexFlipShortEdge" == duplex) return DuplexFlipShortEdge; if ("DuplexFlipLongEdge" == duplex) return DuplexFlipLongEdge; return DuplexUndefined; } DLLEXPORT unsigned long STDCALL FPDF_VIEWERREF_GetName(FPDF_DOCUMENT document, FPDF_BYTESTRING key, char* buffer, unsigned long length) { CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); if (!pDoc) return 0; CPDF_ViewerPreferences viewRef(pDoc); CFX_ByteString bsVal; if (!viewRef.GenericName(key, &bsVal)) return 0; unsigned long dwStringLen = bsVal.GetLength() + 1; if (buffer && length >= dwStringLen) memcpy(buffer, bsVal.c_str(), dwStringLen); return dwStringLen; } DLLEXPORT FPDF_DWORD STDCALL FPDF_CountNamedDests(FPDF_DOCUMENT document) { CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); if (!pDoc) return 0; CPDF_Dictionary* pRoot = pDoc->GetRoot(); if (!pRoot) return 0; CPDF_NameTree nameTree(pDoc, "Dests"); pdfium::base::CheckedNumeric<FPDF_DWORD> count = nameTree.GetCount(); CPDF_Dictionary* pDest = pRoot->GetDictFor("Dests"); if (pDest) count += pDest->GetCount(); if (!count.IsValid()) return 0; return count.ValueOrDie(); } DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDestByName(FPDF_DOCUMENT document, FPDF_BYTESTRING name) { if (!name || name[0] == 0) return nullptr; CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); if (!pDoc) return nullptr; CPDF_NameTree name_tree(pDoc, "Dests"); return name_tree.LookupNamedDest(pDoc, PDF_DecodeText(CFX_ByteString(name))); } #ifdef PDF_ENABLE_XFA DLLEXPORT FPDF_RESULT STDCALL FPDF_BStr_Init(FPDF_BSTR* str) { if (!str) return -1; memset(str, 0, sizeof(FPDF_BSTR)); return 0; } DLLEXPORT FPDF_RESULT STDCALL FPDF_BStr_Set(FPDF_BSTR* str, FPDF_LPCSTR bstr, int length) { if (!str) return -1; if (!bstr || !length) return -1; if (length == -1) length = FXSYS_strlen(bstr); if (length == 0) { if (str->str) { FX_Free(str->str); str->str = nullptr; } str->len = 0; return 0; } if (str->str && str->len < length) str->str = FX_Realloc(char, str->str, length + 1); else if (!str->str) str->str = FX_Alloc(char, length + 1); str->str[length] = 0; memcpy(str->str, bstr, length); str->len = length; return 0; } DLLEXPORT FPDF_RESULT STDCALL FPDF_BStr_Clear(FPDF_BSTR* str) { if (!str) return -1; if (str->str) { FX_Free(str->str); str->str = nullptr; } str->len = 0; return 0; } #endif // PDF_ENABLE_XFA DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDest(FPDF_DOCUMENT document, int index, void* buffer, long* buflen) { if (!buffer) *buflen = 0; if (index < 0) return nullptr; CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document); if (!pDoc) return nullptr; CPDF_Dictionary* pRoot = pDoc->GetRoot(); if (!pRoot) return nullptr; CPDF_Object* pDestObj = nullptr; CFX_ByteString bsName; CFX_WideString wsName; CPDF_NameTree nameTree(pDoc, "Dests"); int count = nameTree.GetCount(); if (index >= count) { CPDF_Dictionary* pDest = pRoot->GetDictFor("Dests"); if (!pDest) return nullptr; pdfium::base::CheckedNumeric<int> checked_count = count; checked_count += pDest->GetCount(); if (!checked_count.IsValid() || index >= checked_count.ValueOrDie()) return nullptr; index -= count; int i = 0; for (const auto& it : *pDest) { bsName = it.first; pDestObj = it.second.get(); if (!pDestObj) continue; if (i == index) break; i++; } wsName = PDF_DecodeText(bsName); } else { pDestObj = nameTree.LookupValueAndName(index, &wsName); } if (!pDestObj) return nullptr; if (CPDF_Dictionary* pDict = pDestObj->AsDictionary()) { pDestObj = pDict->GetArrayFor("D"); if (!pDestObj) return nullptr; } if (!pDestObj->IsArray()) return nullptr; CFX_ByteString utf16Name = wsName.UTF16LE_Encode(); int len = utf16Name.GetLength(); if (!buffer) { *buflen = len; } else if (len <= *buflen) { memcpy(buffer, utf16Name.c_str(), len); *buflen = len; } else { *buflen = -1; } return (FPDF_DEST)pDestObj; }