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42 lines
1.2 KiB
42 lines
1.2 KiB
4 months ago
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// Copyright 2016 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef _BSDIFF_BUFFER_FILE_H_
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#define _BSDIFF_BUFFER_FILE_H_
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#include <memory>
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#include <vector>
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#include "bsdiff/file_interface.h"
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namespace bsdiff {
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class BufferFile : public FileInterface {
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public:
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// Creates a write only BufferFile based on the underlying |file| passed.
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// The BufferFile will cache all the write in a buffer and write everything
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// to |file| at once upon closing. Read and Seek are not supported.
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// |size| should be the estimated total file size, it is used to reserve
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// buffer space.
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BufferFile(std::unique_ptr<FileInterface> file, size_t size);
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~BufferFile() override;
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// FileInterface overrides.
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bool Read(void* buf, size_t count, size_t* bytes_read) override;
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bool Write(const void* buf, size_t count, size_t* bytes_written) override;
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bool Seek(off_t pos) override;
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bool Close() override;
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bool GetSize(uint64_t* size) override;
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private:
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// The underlying FileInterace instance.
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std::unique_ptr<FileInterface> file_ = nullptr;
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std::vector<uint8_t> buffer_;
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};
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} // namespace bsdiff
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#endif // _BSDIFF_BUFFER_FILE_H_
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