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// 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/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"
#include "third_party/base/numerics/safe_conversions.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::base::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::base::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::base::checked_cast<unsigned long>(offset), buffer.data(),
pdfium::base::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();
}