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
108
109
110
111
112
113
114
|
/*
* Copyright (C) 2016 Igalia S.L.
* Copyright (C) 2021 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.
*/
#pragma once
#include "JavaScriptCore/ArrayBuffer.h"
#include "JavaScriptCore/ArrayBufferView.h"
#include "wtf/RefPtr.h"
#include <variant>
namespace WebCore {
class BufferSource {
public:
using VariantType = std::variant<RefPtr<JSC::ArrayBufferView>, RefPtr<JSC::ArrayBuffer>>;
BufferSource() {}
BufferSource(VariantType&& variant)
: m_variant(WTFMove(variant))
{
}
const VariantType& variant() const { return m_variant; }
const uint8_t* data() const
{
return std::visit([](auto& buffer) -> const uint8_t* {
return buffer ? static_cast<const uint8_t*>(buffer->data()) : nullptr;
},
m_variant);
}
void* mutableData() const
{
return std::visit([](auto& buffer) -> void* {
return buffer->data();
},
m_variant);
}
size_t length() const
{
return std::visit([](auto& buffer) -> size_t {
return buffer ? buffer->byteLength() : 0;
},
m_variant);
}
template<class Encoder> void encode(Encoder&) const;
template<class Decoder> static std::optional<BufferSource> decode(Decoder&);
private:
VariantType m_variant;
};
template<class Encoder>
void BufferSource::encode(Encoder& encoder) const
{
encoder << static_cast<uint64_t>(length());
if (!length())
return;
encoder.encodeFixedLengthData(data(), length() * sizeof(uint8_t), alignof(uint8_t));
}
template<class Decoder>
std::optional<BufferSource> BufferSource::decode(Decoder& decoder)
{
std::optional<uint64_t> size;
decoder >> size;
if (!size)
return std::nullopt;
if (!*size)
return BufferSource();
auto dataSize = CheckedSize { *size };
if (UNLIKELY(dataSize.hasOverflowed()))
return std::nullopt;
const uint8_t* data = decoder.decodeFixedLengthReference(dataSize, alignof(uint8_t));
if (!data)
return std::nullopt;
return BufferSource(JSC::ArrayBuffer::tryCreate(static_cast<const void*>(data), dataSize.value()));
}
inline BufferSource toBufferSource(const uint8_t* data, size_t length)
{
return BufferSource(JSC::ArrayBuffer::tryCreate(data, length));
}
} // namespace WebCore
|
