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// Copyright 2018 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_FXCODEC_CODEC_CFX_CODEC_MEMORY_H_
#define CORE_FXCODEC_CODEC_CFX_CODEC_MEMORY_H_
#include <memory>
#include "core/fxcrt/fx_memory.h"
#include "core/fxcrt/retain_ptr.h"
#include "third_party/base/span.h"
class CFX_CodecMemory final : public Retainable {
public:
template <typename T, typename... Args>
friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);
pdfium::span<uint8_t> GetSpan() { return {buffer_.get(), size_}; }
uint8_t* GetBuffer() { return buffer_.get(); }
size_t GetSize() const { return size_; }
size_t GetPosition() const { return pos_; }
bool IsEOF() const { return pos_ >= size_; }
size_t ReadBlock(void* buffer, size_t size);
// Sets the cursor position to |pos| if possible.
bool Seek(size_t pos);
// Try to change the size of the buffer, keep the old one on failure.
bool TryResize(size_t new_buffer_size);
// Schlep the bytes down the buffer.
void Consume(size_t consumed);
private:
explicit CFX_CodecMemory(size_t buffer_size);
~CFX_CodecMemory() override;
std::unique_ptr<uint8_t, FxFreeDeleter> buffer_;
size_t size_ = 0;
size_t pos_ = 0;
};
#endif // CORE_FXCODEC_CODEC_CFX_CODEC_MEMORY_H_
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