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// 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();
}
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