cfx_read_only_vector_stream.h

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// Copyright 2022 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef CORE_FXCRT_CFX_READ_ONLY_VECTOR_STREAM_H_
#define CORE_FXCRT_CFX_READ_ONLY_VECTOR_STREAM_H_
 
#include <stdint.h>
 
#include "core/fxcrt/data_vector.h"
#include "core/fxcrt/fixed_size_data_vector.h"
#include "core/fxcrt/fx_stream.h"
#include "core/fxcrt/retain_ptr.h"
 
class CFX_ReadOnlySpanStream;
 
class CFX_ReadOnlyVectorStream final : public IFX_SeekableReadStream {
 public:
  CONSTRUCT_VIA_MAKE_RETAIN;
 
  // IFX_SeekableReadStream:
  FX_FILESIZE GetSize() override;
  bool ReadBlockAtOffset(pdfium::span<uint8_t> buffer,
                         FX_FILESIZE offset) override;
 
 private:
  explicit CFX_ReadOnlyVectorStream(DataVector<uint8_t> data);
  explicit CFX_ReadOnlyVectorStream(FixedSizeDataVector<uint8_t> data);
  ~CFX_ReadOnlyVectorStream() override;
 
  const DataVector<uint8_t> data_;
  const FixedSizeDataVector<uint8_t> fixed_data_;
  // Spans over either `data_` or `fixed_data_`.
  const RetainPtr<CFX_ReadOnlySpanStream> stream_;
};
 
#endif  // CORE_FXCRT_CFX_READ_ONLY_VECTOR_STREAM_H_