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
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_ipc_SerializeToBytesUtil_h
#define mozilla_ipc_SerializeToBytesUtil_h
#include "chrome/common/ipc_message_utils.h"
#include "chrome/common/ipc_message.h"
namespace mozilla::ipc {
// This file contains a pair of functions which (ab-)use the IPC::ParamTraits
// serializers with a temporary on-stack IPC::Message to serialize &
// de-serialize a value from a byte span.
//
// NOTE: This is _not_ efficient, and is _not_ guaranteed to work for arbitrary
// types! Many IPC serializers depend on the IPC::Message supporting additional
// information, such as attached endpoints and file handles.
template <typename T>
void SerializeToBytesUtil(T&& aValue, nsTArray<char>& aBytes) {
IPC::Message tmpMessage(MSG_ROUTING_NONE, -1);
{
IPC::MessageWriter writer(tmpMessage);
IPC::WriteParam(&writer, std::forward<T>(aValue));
}
MOZ_RELEASE_ASSERT(!tmpMessage.has_any_attachments(),
"Value contains attachments (e.g. endpoints, file "
"handles) which cannot be serialized as bytes");
aBytes.SetLength(tmpMessage.size() - IPC::Message::HeaderSize());
IPC::MessageReader reader(tmpMessage);
bool readOk = reader.ReadBytesInto(aBytes.Elements(), aBytes.Length());
MOZ_RELEASE_ASSERT(readOk);
// Double-check that the entire Message body was used.
MOZ_RELEASE_ASSERT(!reader.HasBytesAvailable(1));
}
template <typename T>
IPC::ReadResult<T> DeserializeFromBytesUtil(const Span<char>& aBytes) {
IPC::Message tmpMessage(MSG_ROUTING_NONE, -1);
{
IPC::MessageWriter writer(tmpMessage);
writer.WriteBytes(aBytes.Elements(), aBytes.Length());
}
IPC::MessageReader reader(tmpMessage);
auto rv = IPC::ReadParam<T>(&reader);
if (rv.isOk() && reader.HasBytesAvailable(1)) {
// Unexpected trailing data after deserialization.
return {};
}
return rv;
}
} // namespace mozilla::ipc
#endif // mozilla_ipc_SerializeToBytesUtil_h
|
