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Side by Side Diff: mojo/embedder/simple_platform_shared_buffer_win.cc

Issue 621153003: Move mojo edk into mojo/edk (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: fix checkdeps Created 6 years, 2 months ago
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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
3 // found in the LICENSE file.
4
5 #include "mojo/embedder/simple_platform_shared_buffer.h"
6
7 #include <windows.h>
8
9 #include <limits>
10
11 #include "base/logging.h"
12 #include "base/sys_info.h"
13 #include "mojo/embedder/platform_handle.h"
14 #include "mojo/embedder/scoped_platform_handle.h"
15
16 namespace mojo {
17 namespace embedder {
18
19 // SimplePlatformSharedBuffer --------------------------------------------------
20
21 bool SimplePlatformSharedBuffer::Init() {
22 DCHECK(!handle_.is_valid());
23
24 // TODO(vtl): Currently, we only support mapping up to 2^32-1 bytes.
25 if (static_cast<uint64_t>(num_bytes_) >
26 static_cast<uint64_t>(std::numeric_limits<DWORD>::max())) {
27 return false;
28 }
29
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
32 // object.
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
35 // when we get there. crbug.com/210609
36 handle_.reset(PlatformHandle(CreateFileMapping(INVALID_HANDLE_VALUE,
37 nullptr,
38 PAGE_READWRITE,
39 0,
40 static_cast<DWORD>(num_bytes_),
41 nullptr)));
42 if (!handle_.is_valid()) {
43 PLOG(ERROR) << "CreateFileMapping";
44 return false;
45 }
46
47 return true;
48 }
49
50 bool SimplePlatformSharedBuffer::InitFromPlatformHandle(
51 ScopedPlatformHandle platform_handle) {
52 DCHECK(!handle_.is_valid());
53
54 // TODO(vtl): Implement.
55 NOTIMPLEMENTED();
56 return false;
57 }
58
59 scoped_ptr<PlatformSharedBufferMapping> SimplePlatformSharedBuffer::MapImpl(
60 size_t offset,
61 size_t length) {
62 size_t offset_rounding = offset % base::SysInfo::VMAllocationGranularity();
63 size_t real_offset = offset - offset_rounding;
64 size_t real_length = length + offset_rounding;
65
66 // This should hold (since we checked |num_bytes| versus the maximum value of
67 // |off_t| on creation, but it never hurts to be paranoid.
68 DCHECK_LE(static_cast<uint64_t>(real_offset),
69 static_cast<uint64_t>(std::numeric_limits<DWORD>::max()));
70
71 void* real_base = MapViewOfFile(handle_.get().handle,
72 FILE_MAP_READ | FILE_MAP_WRITE,
73 0,
74 static_cast<DWORD>(real_offset),
75 real_length);
76 if (!real_base) {
77 PLOG(ERROR) << "MapViewOfFile";
78 return nullptr;
79 }
80
81 void* base = static_cast<char*>(real_base) + offset_rounding;
82 return make_scoped_ptr(new SimplePlatformSharedBufferMapping(
83 base, length, real_base, real_length));
84 }
85
86 // SimplePlatformSharedBufferMapping -------------------------------------------
87
88 void SimplePlatformSharedBufferMapping::Unmap() {
89 BOOL result = UnmapViewOfFile(real_base_);
90 PLOG_IF(ERROR, !result) << "UnmapViewOfFile";
91 }
92
93 } // namespace embedder
94 } // namespace mojo
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