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41 lines
1.2 KiB
41 lines
1.2 KiB
// 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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