| // Copyright 2014 The PDFium Authors |
| // 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/page/cpdf_docpagedata.h" |
| #include "core/fpdfapi/parser/cpdf_data_avail.h" |
| #include "core/fpdfapi/parser/cpdf_document.h" |
| #include "core/fpdfapi/render/cpdf_docrenderdata.h" |
| #include "core/fxcrt/fx_safe_types.h" |
| #include "core/fxcrt/fx_stream.h" |
| #include "core/fxcrt/numerics/safe_conversions.h" |
| #include "core/fxcrt/retain_ptr.h" |
| #include "core/fxcrt/unowned_ptr.h" |
| #include "core/fxcrt/unowned_ptr_exclusion.h" |
| #include "fpdfsdk/cpdfsdk_helpers.h" |
| #include "public/fpdf_formfill.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::kDataError == PDF_DATA_ERROR, |
| "CPDF_DataAvail::kDataError value mismatch"); |
| static_assert(CPDF_DataAvail::kDataNotAvailable == PDF_DATA_NOTAVAIL, |
| "CPDF_DataAvail::kDataNotAvailable value mismatch"); |
| static_assert(CPDF_DataAvail::kDataAvailable == PDF_DATA_AVAIL, |
| "CPDF_DataAvail::kDataAvailable value mismatch"); |
| |
| static_assert(CPDF_DataAvail::kLinearizationUnknown == |
| PDF_LINEARIZATION_UNKNOWN, |
| "CPDF_DataAvail::kLinearizationUnknown value mismatch"); |
| static_assert(CPDF_DataAvail::kNotLinearized == PDF_NOT_LINEARIZED, |
| "CPDF_DataAvail::kNotLinearized value mismatch"); |
| static_assert(CPDF_DataAvail::kLinearized == PDF_LINEARIZED, |
| "CPDF_DataAvail::kLinearized value mismatch"); |
| |
| static_assert(CPDF_DataAvail::kFormError == PDF_FORM_ERROR, |
| "CPDF_DataAvail::kFormError value mismatch"); |
| static_assert(CPDF_DataAvail::kFormNotAvailable == PDF_FORM_NOTAVAIL, |
| "CPDF_DataAvail::kFormNotAvailable value mismatch"); |
| static_assert(CPDF_DataAvail::kFormAvailable == PDF_FORM_AVAIL, |
| "CPDF_DataAvail::kFormAvailable value mismatch"); |
| static_assert(CPDF_DataAvail::kFormNotExist == PDF_FORM_NOTEXIST, |
| "CPDF_DataAvail::kFormNotExist value mismatch"); |
| |
| namespace { |
| |
| class FPDF_FileAvailContext final : public CPDF_DataAvail::FileAvail { |
| public: |
| explicit FPDF_FileAvailContext(FX_FILEAVAIL* avail) : avail_(avail) {} |
| ~FPDF_FileAvailContext() override = default; |
| |
| // CPDF_DataAvail::FileAvail: |
| bool IsDataAvail(FX_FILESIZE offset, size_t size) override { |
| return !!avail_->IsDataAvail(avail_, pdfium::checked_cast<size_t>(offset), |
| size); |
| } |
| |
| private: |
| // TODO(tsepez): fix murky ownership in tests. |
| UNOWNED_PTR_EXCLUSION FX_FILEAVAIL* const avail_; |
| }; |
| |
| class FPDF_FileAccessContext final : public IFX_SeekableReadStream { |
| public: |
| CONSTRUCT_VIA_MAKE_RETAIN; |
| |
| // IFX_SeekableReadStream: |
| FX_FILESIZE GetSize() override { return file_->m_FileLen; } |
| |
| bool ReadBlockAtOffset(pdfium::span<uint8_t> buffer, |
| FX_FILESIZE offset) override { |
| if (buffer.empty() || offset < 0) |
| return false; |
| |
| if (!pdfium::IsValueInRangeForNumericType<FX_FILESIZE>(buffer.size())) { |
| return false; |
| } |
| |
| FX_SAFE_FILESIZE new_pos = buffer.size(); |
| new_pos += offset; |
| return new_pos.IsValid() && new_pos.ValueOrDie() <= GetSize() && |
| file_->m_GetBlock( |
| file_->m_Param, pdfium::checked_cast<unsigned long>(offset), |
| buffer.data(), |
| pdfium::checked_cast<unsigned long>(buffer.size())); |
| } |
| |
| private: |
| explicit FPDF_FileAccessContext(FPDF_FILEACCESS* file) : file_(file) {} |
| ~FPDF_FileAccessContext() override = default; |
| |
| // TODO(tsepez): fix murky ownership in tests. |
| UNOWNED_PTR_EXCLUSION FPDF_FILEACCESS* const file_; |
| }; |
| |
| class FPDF_DownloadHintsContext final : public CPDF_DataAvail::DownloadHints { |
| public: |
| explicit FPDF_DownloadHintsContext(FX_DOWNLOADHINTS* pDownloadHints) |
| : m_pDownloadHints(pDownloadHints) {} |
| ~FPDF_DownloadHintsContext() override = default; |
| |
| // IFX_DownloadHints |
| void AddSegment(FX_FILESIZE offset, size_t size) override { |
| if (m_pDownloadHints) { |
| m_pDownloadHints->AddSegment(m_pDownloadHints, |
| static_cast<size_t>(offset), size); |
| } |
| } |
| |
| private: |
| UnownedPtr<FX_DOWNLOADHINTS> m_pDownloadHints; |
| }; |
| |
| class FPDF_AvailContext { |
| public: |
| FPDF_AvailContext(FX_FILEAVAIL* file_avail, FPDF_FILEACCESS* file) |
| : file_avail_(std::make_unique<FPDF_FileAvailContext>(file_avail)), |
| file_read_(pdfium::MakeRetain<FPDF_FileAccessContext>(file)), |
| data_avail_( |
| std::make_unique<CPDF_DataAvail>(file_avail_.get(), file_read_)) {} |
| ~FPDF_AvailContext() = default; |
| |
| CPDF_DataAvail* data_avail() { return data_avail_.get(); } |
| |
| private: |
| std::unique_ptr<FPDF_FileAvailContext> const file_avail_; |
| RetainPtr<FPDF_FileAccessContext> const file_read_; |
| std::unique_ptr<CPDF_DataAvail> const data_avail_; |
| }; |
| |
| FPDF_AvailContext* FPDFAvailContextFromFPDFAvail(FPDF_AVAIL avail) { |
| return reinterpret_cast<FPDF_AvailContext*>(avail); |
| } |
| |
| FPDF_AVAIL FPDFAvailFromFPDFAvailContext(FPDF_AvailContext* pAvailContext) { |
| return reinterpret_cast<FPDF_AVAIL>(pAvailContext); |
| } |
| |
| } // namespace |
| |
| FPDF_EXPORT FPDF_AVAIL FPDF_CALLCONV FPDFAvail_Create(FX_FILEAVAIL* file_avail, |
| FPDF_FILEACCESS* file) { |
| auto pAvail = std::make_unique<FPDF_AvailContext>(file_avail, file); |
| |
| // Caller takes ownership. |
| return FPDFAvailFromFPDFAvailContext(pAvail.release()); |
| } |
| |
| 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) { |
| auto* avail_context = FPDFAvailContextFromFPDFAvail(avail); |
| if (!avail_context) |
| return PDF_DATA_ERROR; |
| FPDF_DownloadHintsContext hints_context(hints); |
| return avail_context->data_avail()->IsDocAvail(&hints_context); |
| } |
| |
| FPDF_EXPORT FPDF_DOCUMENT FPDF_CALLCONV |
| FPDFAvail_GetDocument(FPDF_AVAIL avail, FPDF_BYTESTRING password) { |
| auto* avail_context = FPDFAvailContextFromFPDFAvail(avail); |
| if (!avail_context) |
| return nullptr; |
| CPDF_Parser::Error error; |
| std::unique_ptr<CPDF_Document> document; |
| std::tie(error, document) = avail_context->data_avail()->ParseDocument( |
| std::make_unique<CPDF_DocRenderData>(), |
| std::make_unique<CPDF_DocPageData>(), password); |
| if (error != CPDF_Parser::SUCCESS) { |
| ProcessParseError(error); |
| return nullptr; |
| } |
| |
| 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) { |
| auto* avail_context = FPDFAvailContextFromFPDFAvail(avail); |
| if (!avail_context) |
| return PDF_DATA_ERROR; |
| if (page_index < 0) |
| return PDF_DATA_NOTAVAIL; |
| FPDF_DownloadHintsContext hints_context(hints); |
| return avail_context->data_avail()->IsPageAvail(page_index, &hints_context); |
| } |
| |
| FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_IsFormAvail(FPDF_AVAIL avail, |
| FX_DOWNLOADHINTS* hints) { |
| auto* avail_context = FPDFAvailContextFromFPDFAvail(avail); |
| if (!avail_context) |
| return PDF_FORM_ERROR; |
| FPDF_DownloadHintsContext hints_context(hints); |
| return avail_context->data_avail()->IsFormAvail(&hints_context); |
| } |
| |
| FPDF_EXPORT int FPDF_CALLCONV FPDFAvail_IsLinearized(FPDF_AVAIL avail) { |
| auto* avail_context = FPDFAvailContextFromFPDFAvail(avail); |
| if (!avail_context) |
| return PDF_LINEARIZATION_UNKNOWN; |
| return avail_context->data_avail()->IsLinearizedPDF(); |
| } |