// 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/fpdf_dataavail.h" #include <memory> #include <utility> #include "core/fpdfapi/parser/cpdf_data_avail.h" #include "core/fpdfapi/parser/cpdf_document.h" #include "core/fxcrt/fx_stream.h" #include "core/fxcrt/retain_ptr.h" #include "fpdfsdk/fsdk_define.h" #include "public/fpdf_formfill.h" #include "third_party/base/ptr_util.h" // These checks are here because core/ and public/ cannot depend on each other. static_assert(CPDF_DataAvail::DataError == PDF_DATA_ERROR, "CPDF_DataAvail::DataError value mismatch"); static_assert(CPDF_DataAvail::DataNotAvailable == PDF_DATA_NOTAVAIL, "CPDF_DataAvail::DataNotAvailable value mismatch"); static_assert(CPDF_DataAvail::DataAvailable == PDF_DATA_AVAIL, "CPDF_DataAvail::DataAvailable value mismatch"); static_assert(CPDF_DataAvail::LinearizationUnknown == PDF_LINEARIZATION_UNKNOWN, "CPDF_DataAvail::LinearizationUnknown value mismatch"); static_assert(CPDF_DataAvail::NotLinearized == PDF_NOT_LINEARIZED, "CPDF_DataAvail::NotLinearized value mismatch"); static_assert(CPDF_DataAvail::Linearized == PDF_LINEARIZED, "CPDF_DataAvail::Linearized value mismatch"); static_assert(CPDF_DataAvail::FormError == PDF_FORM_ERROR, "CPDF_DataAvail::FormError value mismatch"); static_assert(CPDF_DataAvail::FormNotAvailable == PDF_FORM_NOTAVAIL, "CPDF_DataAvail::FormNotAvailable value mismatch"); static_assert(CPDF_DataAvail::FormAvailable == PDF_FORM_AVAIL, "CPDF_DataAvail::FormAvailable value mismatch"); static_assert(CPDF_DataAvail::FormNotExist == PDF_FORM_NOTEXIST, "CPDF_DataAvail::FormNotExist value mismatch"); namespace { class FPDF_FileAvailContext : public CPDF_DataAvail::FileAvail { public: FPDF_FileAvailContext() : m_pfileAvail(nullptr) {} ~FPDF_FileAvailContext() override {} void Set(FX_FILEAVAIL* pfileAvail) { m_pfileAvail = pfileAvail; } // CPDF_DataAvail::FileAvail: bool IsDataAvail(FX_FILESIZE offset, size_t size) override { return !!m_pfileAvail->IsDataAvail(m_pfileAvail, offset, size); } private: FX_FILEAVAIL* m_pfileAvail; }; class FPDF_FileAccessContext : public IFX_SeekableReadStream { public: template <typename T, typename... Args> friend RetainPtr<T> pdfium::MakeRetain(Args&&... args); ~FPDF_FileAccessContext() override {} void Set(FPDF_FILEACCESS* pFile) { m_pFileAccess = pFile; } // IFX_SeekableReadStream FX_FILESIZE GetSize() override { return m_pFileAccess->m_FileLen; } bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override { return !!m_pFileAccess->m_GetBlock(m_pFileAccess->m_Param, offset, (uint8_t*)buffer, size); } private: FPDF_FileAccessContext() : m_pFileAccess(nullptr) {} FPDF_FILEACCESS* m_pFileAccess; }; class FPDF_DownloadHintsContext : public CPDF_DataAvail::DownloadHints { public: explicit FPDF_DownloadHintsContext(FX_DOWNLOADHINTS* pDownloadHints) { m_pDownloadHints = pDownloadHints; } ~FPDF_DownloadHintsContext() override {} public: // IFX_DownloadHints void AddSegment(FX_FILESIZE offset, size_t size) override { if (m_pDownloadHints) m_pDownloadHints->AddSegment(m_pDownloadHints, offset, size); } private: FX_DOWNLOADHINTS* m_pDownloadHints; }; class FPDF_AvailContext { public: FPDF_AvailContext() : m_FileAvail(pdfium::MakeUnique<FPDF_FileAvailContext>()), m_FileRead(pdfium::MakeRetain<FPDF_FileAccessContext>()) {} ~FPDF_AvailContext() {} std::unique_ptr<FPDF_FileAvailContext> m_FileAvail; RetainPtr<FPDF_FileAccessContext> m_FileRead; std::unique_ptr<CPDF_DataAvail> m_pDataAvail; }; FPDF_AvailContext* FPDFAvailContextFromFPDFAvail(FPDF_AVAIL avail) { return static_cast<FPDF_AvailContext*>(avail); } } // namespace FPDF_EXPORT FPDF_AVAIL FPDF_CALLCONV FPDFAvail_Create(FX_FILEAVAIL* file_avail, FPDF_FILEACCESS* file) { auto pAvail = pdfium::MakeUnique<FPDF_AvailContext>(); pAvail->m_FileAvail->Set(file_avail); pAvail->m_FileRead->Set(file); pAvail->m_pDataAvail = pdfium::MakeUnique<CPDF_DataAvail>( pAvail->m_FileAvail.get(), pAvail->m_FileRead, true); return pAvail.release(); // Caller takes ownership. } FPDF_EXPORT void FPDF_CALLCONV FPDFAvail_Destroy(FPDF_AVAIL avail) { // Take ownership back from caller and destroy. std::unique_ptr<FPDF_AvailContext>(FPDFAvailContextFromFPDFAvail(avail)); } FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_IsDocAvail(FPDF_AVAIL avail, FX_DOWNLOADHINTS* hints) { if (!avail) return PDF_DATA_ERROR; FPDF_DownloadHintsContext hints_context(hints); return FPDFAvailContextFromFPDFAvail(avail)->m_pDataAvail->IsDocAvail( &hints_context); } FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV FPDFAvail_GetDocument(FPDF_AVAIL avail, FPDF_BYTESTRING password) { auto* pDataAvail = FPDFAvailContextFromFPDFAvail(avail); if (!pDataAvail) 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()->StartLinearizedParse( pDataAvail->m_pDataAvail->GetFileRead(), pDocument.get()); if (error != CPDF_Parser::SUCCESS) { ProcessParseError(error); return nullptr; } pDataAvail->m_pDataAvail->SetDocument(pDocument.get()); CheckUnSupportError(pDocument.get(), FPDF_ERR_SUCCESS); return FPDFDocumentFromCPDFDocument(pDocument.release()); } FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_GetFirstPageNum(FPDF_DOCUMENT doc) { CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(doc); return pDoc ? pDoc->GetParser()->GetFirstPageNo() : 0; } FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_IsPageAvail(FPDF_AVAIL avail, int page_index, FX_DOWNLOADHINTS* hints) { if (!avail) return PDF_DATA_ERROR; if (page_index < 0) return PDF_DATA_NOTAVAIL; FPDF_DownloadHintsContext hints_context(hints); return FPDFAvailContextFromFPDFAvail(avail)->m_pDataAvail->IsPageAvail( page_index, &hints_context); } FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_IsFormAvail(FPDF_AVAIL avail, FX_DOWNLOADHINTS* hints) { if (!avail) return PDF_FORM_ERROR; FPDF_DownloadHintsContext hints_context(hints); return FPDFAvailContextFromFPDFAvail(avail)->m_pDataAvail->IsFormAvail( &hints_context); } FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_IsLinearized(FPDF_AVAIL avail) { if (!avail) return PDF_LINEARIZATION_UNKNOWN; return FPDFAvailContextFromFPDFAvail(avail)->m_pDataAvail->IsLinearizedPDF(); }