1 // Copyright 2016 The Chromium OS Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef _BSDIFF_MEMORY_FILE_H_
6 #define _BSDIFF_MEMORY_FILE_H_
7 
8 #include <memory>
9 
10 #include "bsdiff/file_interface.h"
11 
12 namespace bsdiff {
13 
14 class MemoryFile : public FileInterface {
15  public:
16   // Creates a read only MemoryFile based on the underlying |data| passed.
17   // The MemoryFile will use data starting from |data| with length of |size| as
18   // the file content. Write is not supported.
19   MemoryFile(const uint8_t* data, size_t size);
20 
21   ~MemoryFile() = default;
22 
23   // FileInterface overrides.
24   bool Read(void* buf, size_t count, size_t* bytes_read) override;
25   bool Write(const void* buf, size_t count, size_t* bytes_written) override;
26   bool Seek(off_t pos) override;
27   bool Close() override;
28   bool GetSize(uint64_t* size) override;
29 
30  private:
31   const uint8_t* data_ = nullptr;
32   size_t size_ = 0;
33   off_t offset_ = 0;
34 };
35 
36 }  // namespace bsdiff
37 
38 #endif  // _BSDIFF_MEMORY_FILE_H_
39