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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 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 "mojo/edk/embedder/simple_platform_shared_buffer.h" | 5 #include "mojo/edk/embedder/simple_platform_shared_buffer.h" |
6 | 6 |
7 #include <windows.h> | 7 #include <windows.h> |
8 | 8 |
9 #include <limits> | 9 #include <limits> |
10 | 10 |
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26 static_cast<uint64_t>(std::numeric_limits<DWORD>::max())) { | 26 static_cast<uint64_t>(std::numeric_limits<DWORD>::max())) { |
27 return false; | 27 return false; |
28 } | 28 } |
29 | 29 |
30 // IMPORTANT NOTE: Unnamed objects are NOT SECURABLE. Thus if we ever want to | 30 // IMPORTANT NOTE: Unnamed objects are NOT SECURABLE. Thus if we ever want to |
31 // share read-only to other processes, we'll have to name our file mapping | 31 // share read-only to other processes, we'll have to name our file mapping |
32 // object. | 32 // object. |
33 // TODO(vtl): Unlike |base::SharedMemory|, we don't round up the size (to a | 33 // TODO(vtl): Unlike |base::SharedMemory|, we don't round up the size (to a |
34 // multiple of 64 KB). This may cause problems with NaCl. Cross this bridge | 34 // multiple of 64 KB). This may cause problems with NaCl. Cross this bridge |
35 // when we get there. crbug.com/210609 | 35 // when we get there. crbug.com/210609 |
36 handle_.reset(PlatformHandle( | 36 handle_.reset(PlatformHandle(CreateFileMapping(INVALID_HANDLE_VALUE, |
37 CreateFileMapping(INVALID_HANDLE_VALUE, nullptr, PAGE_READWRITE, 0, | 37 nullptr, |
38 static_cast<DWORD>(num_bytes_), nullptr))); | 38 PAGE_READWRITE, |
| 39 0, |
| 40 static_cast<DWORD>(num_bytes_), |
| 41 nullptr))); |
39 if (!handle_.is_valid()) { | 42 if (!handle_.is_valid()) { |
40 PLOG(ERROR) << "CreateFileMapping"; | 43 PLOG(ERROR) << "CreateFileMapping"; |
41 return false; | 44 return false; |
42 } | 45 } |
43 | 46 |
44 return true; | 47 return true; |
45 } | 48 } |
46 | 49 |
47 bool SimplePlatformSharedBuffer::InitFromPlatformHandle( | 50 bool SimplePlatformSharedBuffer::InitFromPlatformHandle( |
48 ScopedPlatformHandle platform_handle) { | 51 ScopedPlatformHandle platform_handle) { |
49 DCHECK(!handle_.is_valid()); | 52 DCHECK(!handle_.is_valid()); |
50 | 53 |
51 // TODO(vtl): Implement. | 54 // TODO(vtl): Implement. |
52 NOTIMPLEMENTED(); | 55 NOTIMPLEMENTED(); |
53 return false; | 56 return false; |
54 } | 57 } |
55 | 58 |
56 scoped_ptr<PlatformSharedBufferMapping> SimplePlatformSharedBuffer::MapImpl( | 59 scoped_ptr<PlatformSharedBufferMapping> SimplePlatformSharedBuffer::MapImpl( |
57 size_t offset, | 60 size_t offset, |
58 size_t length) { | 61 size_t length) { |
59 size_t offset_rounding = offset % base::SysInfo::VMAllocationGranularity(); | 62 size_t offset_rounding = offset % base::SysInfo::VMAllocationGranularity(); |
60 size_t real_offset = offset - offset_rounding; | 63 size_t real_offset = offset - offset_rounding; |
61 size_t real_length = length + offset_rounding; | 64 size_t real_length = length + offset_rounding; |
62 | 65 |
63 // This should hold (since we checked |num_bytes| versus the maximum value of | 66 // This should hold (since we checked |num_bytes| versus the maximum value of |
64 // |off_t| on creation, but it never hurts to be paranoid. | 67 // |off_t| on creation, but it never hurts to be paranoid. |
65 DCHECK_LE(static_cast<uint64_t>(real_offset), | 68 DCHECK_LE(static_cast<uint64_t>(real_offset), |
66 static_cast<uint64_t>(std::numeric_limits<DWORD>::max())); | 69 static_cast<uint64_t>(std::numeric_limits<DWORD>::max())); |
67 | 70 |
68 void* real_base = | 71 void* real_base = MapViewOfFile(handle_.get().handle, |
69 MapViewOfFile(handle_.get().handle, FILE_MAP_READ | FILE_MAP_WRITE, 0, | 72 FILE_MAP_READ | FILE_MAP_WRITE, |
70 static_cast<DWORD>(real_offset), real_length); | 73 0, |
| 74 static_cast<DWORD>(real_offset), |
| 75 real_length); |
71 if (!real_base) { | 76 if (!real_base) { |
72 PLOG(ERROR) << "MapViewOfFile"; | 77 PLOG(ERROR) << "MapViewOfFile"; |
73 return nullptr; | 78 return nullptr; |
74 } | 79 } |
75 | 80 |
76 void* base = static_cast<char*>(real_base) + offset_rounding; | 81 void* base = static_cast<char*>(real_base) + offset_rounding; |
77 return make_scoped_ptr(new SimplePlatformSharedBufferMapping( | 82 return make_scoped_ptr(new SimplePlatformSharedBufferMapping( |
78 base, length, real_base, real_length)); | 83 base, length, real_base, real_length)); |
79 } | 84 } |
80 | 85 |
81 // SimplePlatformSharedBufferMapping ------------------------------------------- | 86 // SimplePlatformSharedBufferMapping ------------------------------------------- |
82 | 87 |
83 void SimplePlatformSharedBufferMapping::Unmap() { | 88 void SimplePlatformSharedBufferMapping::Unmap() { |
84 BOOL result = UnmapViewOfFile(real_base_); | 89 BOOL result = UnmapViewOfFile(real_base_); |
85 PLOG_IF(ERROR, !result) << "UnmapViewOfFile"; | 90 PLOG_IF(ERROR, !result) << "UnmapViewOfFile"; |
86 } | 91 } |
87 | 92 |
88 } // namespace embedder | 93 } // namespace embedder |
89 } // namespace mojo | 94 } // namespace mojo |
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