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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 #include "base/files/memory_mapped_file.h" | 5 #include "base/files/memory_mapped_file.h" |
| 6 | 6 |
| 7 #include "base/files/file_path.h" | 7 #include "base/files/file_path.h" |
| 8 #include "base/logging.h" | 8 #include "base/logging.h" |
| 9 #include "base/sys_info.h" | 9 #include "base/sys_info.h" |
| 10 | 10 |
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| 67 } | 67 } |
| 68 | 68 |
| 69 return true; | 69 return true; |
| 70 } | 70 } |
| 71 | 71 |
| 72 bool MemoryMappedFile::IsValid() const { | 72 bool MemoryMappedFile::IsValid() const { |
| 73 return data_ != NULL; | 73 return data_ != NULL; |
| 74 } | 74 } |
| 75 | 75 |
| 76 // static | 76 // static |
| 77 void MemoryMappedFile::CalculateVMAlignedBoundaries(int64 start, | 77 void MemoryMappedFile::CalculateVMAlignedBoundaries(int64_t start, |
| 78 int64 size, | 78 int64_t size, |
| 79 int64* aligned_start, | 79 int64_t* aligned_start, |
| 80 int64* aligned_size, | 80 int64_t* aligned_size, |
| 81 int32* offset) { | 81 int32_t* offset) { |
| 82 // Sadly, on Windows, the mmap alignment is not just equal to the page size. | 82 // Sadly, on Windows, the mmap alignment is not just equal to the page size. |
| 83 const int64 mask = static_cast<int64>(SysInfo::VMAllocationGranularity()) - 1; | 83 const int64_t mask = |
| 84 DCHECK_LT(mask, std::numeric_limits<int32>::max()); | 84 static_cast<int64_t>(SysInfo::VMAllocationGranularity()) - 1; |
| 85 DCHECK_LT(mask, std::numeric_limits<int32_t>::max()); |
| 85 *offset = start & mask; | 86 *offset = start & mask; |
| 86 *aligned_start = start & ~mask; | 87 *aligned_start = start & ~mask; |
| 87 *aligned_size = (size + *offset + mask) & ~mask; | 88 *aligned_size = (size + *offset + mask) & ~mask; |
| 88 } | 89 } |
| 89 #endif | 90 #endif |
| 90 | 91 |
| 91 } // namespace base | 92 } // namespace base |
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