109 lines
3.1 KiB
C++
109 lines
3.1 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "RawShmem.h"
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#include "mozilla/ipc/ProtocolUtils.h"
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namespace mozilla::ipc {
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UnsafeSharedMemoryHandle::UnsafeSharedMemoryHandle()
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: mHandle(ipc::SharedMemory::NULLHandle()), mSize(0) {}
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UnsafeSharedMemoryHandle::UnsafeSharedMemoryHandle(
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UnsafeSharedMemoryHandle&& aOther) noexcept
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: mHandle(std::move(aOther.mHandle)), mSize(aOther.mSize) {
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aOther.mHandle = ipc::SharedMemory::NULLHandle();
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aOther.mSize = 0;
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}
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UnsafeSharedMemoryHandle& UnsafeSharedMemoryHandle::operator=(
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UnsafeSharedMemoryHandle&& aOther) noexcept {
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if (this == &aOther) {
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return *this;
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}
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mHandle = std::move(aOther.mHandle);
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mSize = aOther.mSize;
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aOther.mHandle = ipc::SharedMemory::NULLHandle();
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aOther.mSize = 0;
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return *this;
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}
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Maybe<std::pair<UnsafeSharedMemoryHandle, WritableSharedMemoryMapping>>
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UnsafeSharedMemoryHandle::CreateAndMap(size_t aSize) {
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if (aSize == 0) {
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return Some(std::make_pair(UnsafeSharedMemoryHandle(),
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WritableSharedMemoryMapping()));
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}
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RefPtr<ipc::SharedMemory> shm = MakeAndAddRef<ipc::SharedMemory>();
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if (NS_WARN_IF(!shm->Create(aSize)) || NS_WARN_IF(!shm->Map(aSize))) {
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return Nothing();
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}
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auto handle = shm->TakeHandle();
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auto size = shm->Size();
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return Some(std::make_pair(UnsafeSharedMemoryHandle(std::move(handle), size),
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WritableSharedMemoryMapping(std::move(shm))));
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}
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WritableSharedMemoryMapping::WritableSharedMemoryMapping(
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RefPtr<ipc::SharedMemory>&& aRef)
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: mRef(aRef) {}
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Maybe<WritableSharedMemoryMapping> WritableSharedMemoryMapping::Open(
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UnsafeSharedMemoryHandle aHandle) {
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if (aHandle.mSize == 0) {
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return Some(WritableSharedMemoryMapping(nullptr));
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}
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RefPtr<ipc::SharedMemory> shm = MakeAndAddRef<ipc::SharedMemory>();
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if (NS_WARN_IF(!shm->SetHandle(std::move(aHandle.mHandle),
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ipc::SharedMemory::RightsReadWrite)) ||
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NS_WARN_IF(!shm->Map(aHandle.mSize))) {
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return Nothing();
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}
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shm->CloseHandle();
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return Some(WritableSharedMemoryMapping(std::move(shm)));
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}
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size_t WritableSharedMemoryMapping::Size() const {
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if (!mRef) {
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return 0;
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}
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return mRef->Size();
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}
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Span<uint8_t> WritableSharedMemoryMapping::Bytes() {
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if (!mRef) {
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return Span<uint8_t>();
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}
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uint8_t* mem = static_cast<uint8_t*>(mRef->Memory());
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return Span(mem, mRef->Size());
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}
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} // namespace mozilla::ipc
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namespace IPC {
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auto ParamTraits<mozilla::ipc::UnsafeSharedMemoryHandle>::Write(
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IPC::MessageWriter* aWriter, paramType&& aVar) -> void {
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IPC::WriteParam(aWriter, std::move(aVar.mHandle));
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IPC::WriteParam(aWriter, aVar.mSize);
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}
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auto ParamTraits<mozilla::ipc::UnsafeSharedMemoryHandle>::Read(
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IPC::MessageReader* aReader, paramType* aVar) -> bool {
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return IPC::ReadParam(aReader, &aVar->mHandle) &&
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IPC::ReadParam(aReader, &aVar->mSize);
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}
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} // namespace IPC
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