1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "mojo/public/cpp/system/buffer.h"
namespace mojo {
// static
ScopedSharedBufferHandle SharedBufferHandle::Create(uint64_t num_bytes) {
MojoCreateSharedBufferOptions options = {sizeof(options),
MOJO_CREATE_SHARED_BUFFER_FLAG_NONE};
SharedBufferHandle handle;
MojoCreateSharedBuffer(num_bytes, &options, handle.mutable_value());
return MakeScopedHandle(handle);
}
ScopedSharedBufferHandle SharedBufferHandle::Clone(
SharedBufferHandle::AccessMode access_mode) const {
ScopedSharedBufferHandle result;
if (!is_valid())
return result;
MojoDuplicateBufferHandleOptions options = {
sizeof(options), MOJO_DUPLICATE_BUFFER_HANDLE_FLAG_NONE};
if (access_mode == AccessMode::READ_ONLY)
options.flags |= MOJO_DUPLICATE_BUFFER_HANDLE_FLAG_READ_ONLY;
SharedBufferHandle result_handle;
MojoDuplicateBufferHandle(value(), &options, result_handle.mutable_value());
result.reset(result_handle);
return result;
}
ScopedSharedBufferMapping SharedBufferHandle::Map(uint64_t size) const {
return MapAtOffset(size, 0);
}
ScopedSharedBufferMapping SharedBufferHandle::MapAtOffset(
uint64_t size,
uint64_t offset) const {
void* buffer = nullptr;
MojoMapBuffer(value(), offset, size, nullptr, &buffer);
return ScopedSharedBufferMapping(buffer);
}
uint64_t SharedBufferHandle::GetSize() const {
MojoSharedBufferInfo buffer_info;
buffer_info.struct_size = sizeof(buffer_info);
return MojoGetBufferInfo(value(), nullptr, &buffer_info) == MOJO_RESULT_OK
? buffer_info.size
: 0;
}
} // namespace mojo
|
