| // 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/cpdfsdk_helpers.h" |
| #include "public/fpdf_formfill.h" |
| #include "third_party/base/ptr_util.h" |
| |
| #ifdef PDF_ENABLE_XFA |
| #include "fpdfsdk/fpdfxfa/cpdfxfa_context.h" |
| #endif // PDF_ENABLE_XFA |
| |
| // 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 final : 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 final : public IFX_SeekableReadStream { |
| public: |
| template <typename T, typename... Args> |
| friend RetainPtr<T> pdfium::MakeRetain(Args&&... args); |
| |
| 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, |
| static_cast<uint8_t*>(buffer), size); |
| } |
| |
| private: |
| FPDF_FileAccessContext() : m_pFileAccess(nullptr) {} |
| ~FPDF_FileAccessContext() override = default; |
| |
| FPDF_FILEACCESS* m_pFileAccess; |
| }; |
| |
| class FPDF_DownloadHintsContext final : 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; |
| CPDF_Parser::Error error; |
| std::unique_ptr<CPDF_Document> document; |
| std::tie(error, document) = pDataAvail->m_pDataAvail->ParseDocument(password); |
| if (error != CPDF_Parser::SUCCESS) { |
| ProcessParseError(error); |
| return nullptr; |
| } |
| |
| #ifdef PDF_ENABLE_XFA |
| document->SetExtension(pdfium::MakeUnique<CPDFXFA_Context>(document.get())); |
| #endif // PDF_ENABLE_XFA |
| |
| ReportUnsupportedFeatures(document.get()); |
| return FPDFDocumentFromCPDFDocument(document.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(); |
| } |