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Side by Side Diff: base/files/memory_mapped_file.h

Issue 1499423004: Remove kint32max. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@kint9
Patch Set: rebase Created 5 years ago
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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"
10 #include "base/files/file.h" 9 #include "base/files/file.h"
10 #include "base/macros.h"
11 #include "build/build_config.h" 11 #include "build/build_config.h"
12 12
13 #if defined(OS_WIN) 13 #if defined(OS_WIN)
14 #include <windows.h> 14 #include <windows.h>
15 #endif 15 #endif
16 16
17 namespace base { 17 namespace base {
18 18
19 class FilePath; 19 class FilePath;
20 20
21 class BASE_EXPORT MemoryMappedFile { 21 class BASE_EXPORT MemoryMappedFile {
22 public: 22 public:
23 // The default constructor sets all members to invalid/null values. 23 // The default constructor sets all members to invalid/null values.
24 MemoryMappedFile(); 24 MemoryMappedFile();
25 ~MemoryMappedFile(); 25 ~MemoryMappedFile();
26 26
27 // Used to hold information about a region [offset + size] of a file. 27 // Used to hold information about a region [offset + size] of a file.
28 struct BASE_EXPORT Region { 28 struct BASE_EXPORT Region {
29 static const Region kWholeFile; 29 static const Region kWholeFile;
30 30
31 bool operator==(const Region& other) const; 31 bool operator==(const Region& other) const;
32 bool operator!=(const Region& other) const; 32 bool operator!=(const Region& other) const;
33 33
34 // Start of the region (measured in bytes from the beginning of the file). 34 // Start of the region (measured in bytes from the beginning of the file).
35 int64 offset; 35 int64_t offset;
36 36
37 // Length of the region in bytes. 37 // Length of the region in bytes.
38 int64 size; 38 int64_t size;
39 }; 39 };
40 40
41 // Opens an existing file and maps it into memory. Access is restricted to 41 // Opens an existing file and maps it into memory. Access is restricted to
42 // read only. If this object already points to a valid memory mapped file 42 // read only. If this object already points to a valid memory mapped file
43 // then this method will fail and return false. If it cannot open the file, 43 // then this method will fail and return false. If it cannot open the file,
44 // the file does not exist, or the memory mapping fails, it will return false. 44 // the file does not exist, or the memory mapping fails, it will return false.
45 // Later we may want to allow the user to specify access. 45 // Later we may want to allow the user to specify access.
46 bool Initialize(const FilePath& file_name); 46 bool Initialize(const FilePath& file_name);
47 47
48 // As above, but works with an already-opened file. MemoryMappedFile takes 48 // As above, but works with an already-opened file. MemoryMappedFile takes
49 // ownership of |file| and closes it when done. 49 // ownership of |file| and closes it when done.
50 bool Initialize(File file); 50 bool Initialize(File file);
51 51
52 // As above, but works with a region of an already-opened file. 52 // As above, but works with a region of an already-opened file.
53 bool Initialize(File file, const Region& region); 53 bool Initialize(File file, const Region& region);
54 54
55 #if defined(OS_WIN) 55 #if defined(OS_WIN)
56 // Opens an existing file and maps it as an image section. Please refer to 56 // Opens an existing file and maps it as an image section. Please refer to
57 // the Initialize function above for additional information. 57 // the Initialize function above for additional information.
58 bool InitializeAsImageSection(const FilePath& file_name); 58 bool InitializeAsImageSection(const FilePath& file_name);
59 #endif // OS_WIN 59 #endif // OS_WIN
60 60
61 const uint8* data() const { return data_; } 61 const uint8_t* data() const { return data_; }
62 size_t length() const { return length_; } 62 size_t length() const { return length_; }
63 63
64 // Is file_ a valid file handle that points to an open, memory mapped file? 64 // Is file_ a valid file handle that points to an open, memory mapped file?
65 bool IsValid() const; 65 bool IsValid() const;
66 66
67 private: 67 private:
68 // Given the arbitrarily aligned memory region [start, size], returns the 68 // Given the arbitrarily aligned memory region [start, size], returns the
69 // boundaries of the region aligned to the granularity specified by the OS, 69 // boundaries of the region aligned to the granularity specified by the OS,
70 // (a page on Linux, ~32k on Windows) as follows: 70 // (a page on Linux, ~32k on Windows) as follows:
71 // - |aligned_start| is page aligned and <= |start|. 71 // - |aligned_start| is page aligned and <= |start|.
72 // - |aligned_size| is a multiple of the VM granularity and >= |size|. 72 // - |aligned_size| is a multiple of the VM granularity and >= |size|.
73 // - |offset| is the displacement of |start| w.r.t |aligned_start|. 73 // - |offset| is the displacement of |start| w.r.t |aligned_start|.
74 static void CalculateVMAlignedBoundaries(int64 start, 74 static void CalculateVMAlignedBoundaries(int64_t start,
75 int64 size, 75 int64_t size,
76 int64* aligned_start, 76 int64_t* aligned_start,
77 int64* aligned_size, 77 int64_t* aligned_size,
78 int32* offset); 78 int32_t* offset);
79 79
80 // Map the file to memory, set data_ to that memory address. Return true on 80 // Map the file to memory, set data_ to that memory address. Return true on
81 // success, false on any kind of failure. This is a helper for Initialize(). 81 // success, false on any kind of failure. This is a helper for Initialize().
82 bool MapFileRegionToMemory(const Region& region); 82 bool MapFileRegionToMemory(const Region& region);
83 83
84 // Closes all open handles. 84 // Closes all open handles.
85 void CloseHandles(); 85 void CloseHandles();
86 86
87 File file_; 87 File file_;
88 uint8* data_; 88 uint8_t* data_;
89 size_t length_; 89 size_t length_;
90 90
91 #if defined(OS_WIN) 91 #if defined(OS_WIN)
92 win::ScopedHandle file_mapping_; 92 win::ScopedHandle file_mapping_;
93 bool image_; // Map as an image. 93 bool image_; // Map as an image.
94 #endif 94 #endif
95 95
96 DISALLOW_COPY_AND_ASSIGN(MemoryMappedFile); 96 DISALLOW_COPY_AND_ASSIGN(MemoryMappedFile);
97 }; 97 };
98 98
99 } // namespace base 99 } // namespace base
100 100
101 #endif // BASE_FILES_MEMORY_MAPPED_FILE_H_ 101 #endif // BASE_FILES_MEMORY_MAPPED_FILE_H_
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