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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_FILES_MEMORY_MAPPED_FILE_H_ | 5 #ifndef BASE_FILES_MEMORY_MAPPED_FILE_H_ |
6 #define BASE_FILES_MEMORY_MAPPED_FILE_H_ | 6 #define BASE_FILES_MEMORY_MAPPED_FILE_H_ |
7 | 7 |
8 #include "base/base_export.h" | 8 #include "base/base_export.h" |
9 #include "base/basictypes.h" | 9 #include "base/basictypes.h" |
10 #include "base/files/file.h" | 10 #include "base/files/file.h" |
11 #include "build/build_config.h" | 11 #include "build/build_config.h" |
12 | 12 |
13 #if defined(OS_WIN) | |
14 #include <windows.h> | |
15 #endif | |
16 | |
17 namespace base { | 13 namespace base { |
18 | 14 |
19 class FilePath; | 15 class FilePath; |
20 | 16 |
21 class BASE_EXPORT MemoryMappedFile { | 17 class BASE_EXPORT MemoryMappedFile { |
22 public: | 18 public: |
23 // The default constructor sets all members to invalid/null values. | 19 // The default constructor sets all members to invalid/null values. |
24 MemoryMappedFile(); | 20 MemoryMappedFile(); |
25 ~MemoryMappedFile(); | 21 ~MemoryMappedFile(); |
26 | 22 |
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52 // Later we may want to allow the user to specify access. | 48 // Later we may want to allow the user to specify access. |
53 bool Initialize(const FilePath& file_name); | 49 bool Initialize(const FilePath& file_name); |
54 | 50 |
55 // As above, but works with an already-opened file. MemoryMappedFile takes | 51 // As above, but works with an already-opened file. MemoryMappedFile takes |
56 // ownership of |file| and closes it when done. | 52 // ownership of |file| and closes it when done. |
57 bool Initialize(File file); | 53 bool Initialize(File file); |
58 | 54 |
59 // As above, but works with a region of an already-opened file. | 55 // As above, but works with a region of an already-opened file. |
60 bool Initialize(File file, const Region& region); | 56 bool Initialize(File file, const Region& region); |
61 | 57 |
62 #if defined(OS_WIN) | |
63 // Opens an existing file and maps it as an image section. Please refer to | |
64 // the Initialize function above for additional information. | |
65 bool InitializeAsImageSection(const FilePath& file_name); | |
66 #endif // OS_WIN | |
67 | |
68 const uint8* data() const { return data_; } | 58 const uint8* data() const { return data_; } |
69 size_t length() const { return length_; } | 59 size_t length() const { return length_; } |
70 | 60 |
71 // Is file_ a valid file handle that points to an open, memory mapped file? | 61 // Is file_ a valid file handle that points to an open, memory mapped file? |
72 bool IsValid() const; | 62 bool IsValid() const; |
73 | 63 |
74 private: | 64 private: |
75 // Given the arbitrarily aligned memory region [start, size], returns the | 65 // Given the arbitrarily aligned memory region [start, size], returns the |
76 // boundaries of the region aligned to the granularity specified by the OS, | 66 // boundaries of the region aligned to the granularity specified by the OS, |
77 // (a page on Linux, ~32k on Windows) as follows: | 67 // (a page on Linux, ~32k on Windows) as follows: |
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88 // success, false on any kind of failure. This is a helper for Initialize(). | 78 // success, false on any kind of failure. This is a helper for Initialize(). |
89 bool MapFileRegionToMemory(const Region& region); | 79 bool MapFileRegionToMemory(const Region& region); |
90 | 80 |
91 // Closes all open handles. | 81 // Closes all open handles. |
92 void CloseHandles(); | 82 void CloseHandles(); |
93 | 83 |
94 File file_; | 84 File file_; |
95 uint8* data_; | 85 uint8* data_; |
96 size_t length_; | 86 size_t length_; |
97 | 87 |
98 #if defined(OS_WIN) | |
99 win::ScopedHandle file_mapping_; | |
100 bool image_; // Map as an image. | |
101 #endif | |
102 | |
103 DISALLOW_COPY_AND_ASSIGN(MemoryMappedFile); | 88 DISALLOW_COPY_AND_ASSIGN(MemoryMappedFile); |
104 }; | 89 }; |
105 | 90 |
106 } // namespace base | 91 } // namespace base |
107 | 92 |
108 #endif // BASE_FILES_MEMORY_MAPPED_FILE_H_ | 93 #endif // BASE_FILES_MEMORY_MAPPED_FILE_H_ |
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