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
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
/*
* Copyright (C) 2018-2022 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "SharedBufferReference.h"
#include "Decoder.h"
#include "Encoder.h"
#include <WebCore/SharedMemory.h>
namespace IPC {
using namespace WebCore;
#if !USE(UNIX_DOMAIN_SOCKETS)
SharedBufferReference::SharedBufferReference(std::optional<SerializableBuffer>&& serializableBuffer)
{
if (!serializableBuffer)
return;
if (!serializableBuffer->size) {
m_buffer = SharedBuffer::create();
return;
}
if (!serializableBuffer->handle)
return;
auto sharedMemoryBuffer = SharedMemory::map(WTFMove(*serializableBuffer->handle), SharedMemory::Protection::ReadOnly);
if (!sharedMemoryBuffer || sharedMemoryBuffer->size() < serializableBuffer->size)
return;
m_size = serializableBuffer->size;
m_memory = WTFMove(sharedMemoryBuffer);
}
auto SharedBufferReference::serializableBuffer() const -> std::optional<SerializableBuffer>
{
if (isNull())
return std::nullopt;
if (!m_size)
return SerializableBuffer { 0, std::nullopt };
auto sharedMemoryBuffer = m_memory ? m_memory : SharedMemory::copyBuffer(Ref { *m_buffer });
return SerializableBuffer { m_size, sharedMemoryBuffer->createHandle(SharedMemory::Protection::ReadOnly) };
}
#endif
RefPtr<WebCore::SharedBuffer> SharedBufferReference::unsafeBuffer() const
{
#if !USE(UNIX_DOMAIN_SOCKETS)
RELEASE_ASSERT_WITH_MESSAGE(isEmpty() || (!m_buffer && m_memory), "Must only be called on IPC's receiver side");
if (RefPtr memory = m_memory)
return memory->createSharedBuffer(m_size);
#endif
if (RefPtr buffer = m_buffer)
return buffer->makeContiguous();
return nullptr;
}
std::span<const uint8_t> SharedBufferReference::span() const
{
#if !USE(UNIX_DOMAIN_SOCKETS)
RELEASE_ASSERT_WITH_MESSAGE(isEmpty() || (!m_buffer && m_memory), "Must only be called on IPC's receiver side");
if (m_memory)
return m_memory->span().first(m_size);
#endif
if (!m_buffer)
return { };
if (!m_buffer->isContiguous())
m_buffer = RefPtr { m_buffer }->makeContiguous();
return downcast<SharedBuffer>(m_buffer.get())->span().first(m_size);
}
RefPtr<WebCore::SharedMemory> SharedBufferReference::sharedCopy() const
{
if (!m_size)
return nullptr;
return SharedMemory::copyBuffer(*unsafeBuffer());
}
} // namespace IPC
|
