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// Copyright 2017 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.
#ifndef CORE_FPDFAPI_PARSER_CPDF_READ_VALIDATOR_H_
#define CORE_FPDFAPI_PARSER_CPDF_READ_VALIDATOR_H_
#include "core/fpdfapi/parser/cpdf_data_avail.h"
#include "core/fxcrt/fx_stream.h"
class CPDF_ReadValidator : public IFX_SeekableReadStream {
public:
class Session {
public:
explicit Session(CPDF_ReadValidator* validator);
~Session();
private:
UnownedPtr<CPDF_ReadValidator> validator_;
bool saved_read_error_;
bool saved_has_unavailable_data_;
};
void SetDownloadHints(CPDF_DataAvail::DownloadHints* hints) {
hints_ = hints;
}
template <typename T, typename... Args>
friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);
bool read_error() const { return read_error_; }
bool has_unavailable_data() const { return has_unavailable_data_; }
bool has_read_problems() const {
return read_error() || has_unavailable_data();
}
void ResetErrors();
bool IsWholeFileAvailable();
bool CheckDataRangeAndRequestIfUnavailable(FX_FILESIZE offset, size_t size);
bool CheckWholeFileAndRequestIfUnavailable();
// IFX_SeekableReadStream overrides:
bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
FX_FILESIZE GetSize() override;
protected:
CPDF_ReadValidator(const RetainPtr<IFX_SeekableReadStream>& file_read,
CPDF_DataAvail::FileAvail* file_avail);
~CPDF_ReadValidator() override;
private:
void ScheduleDownload(FX_FILESIZE offset, size_t size);
bool IsDataRangeAvailable(FX_FILESIZE offset, size_t size) const;
RetainPtr<IFX_SeekableReadStream> file_read_;
UnownedPtr<CPDF_DataAvail::FileAvail> file_avail_;
UnownedPtr<CPDF_DataAvail::DownloadHints> hints_;
bool read_error_;
bool has_unavailable_data_;
bool whole_file_already_available_;
const FX_FILESIZE file_size_;
};
#endif // CORE_FPDFAPI_PARSER_CPDF_READ_VALIDATOR_H_
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