111 lines
3.6 KiB
C++
111 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/ipc/BigBuffer.h"
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#include "chrome/common/ipc_message_utils.h"
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#include "nsDebug.h"
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namespace mozilla::ipc {
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BigBuffer::BigBuffer(Adopt, SharedMemoryMappingWithHandle&& aSharedMemory,
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size_t aSize)
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: mSize(aSize), mData(AsVariant(std::move(aSharedMemory))) {
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MOZ_RELEASE_ASSERT(mData.as<1>(), "shared memory must be valid");
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MOZ_RELEASE_ASSERT(mSize <= mData.as<1>().Size(),
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"shared memory region isn't large enough");
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}
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BigBuffer::BigBuffer(Adopt, uint8_t* aData, size_t aSize)
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: mSize(aSize), mData(AsVariant(UniqueFreePtr<uint8_t[]>{aData})) {}
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uint8_t* BigBuffer::Data() {
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return mData.is<0>() ? mData.as<0>().get() : mData.as<1>().DataAs<uint8_t>();
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}
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const uint8_t* BigBuffer::Data() const {
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return mData.is<0>() ? mData.as<0>().get()
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: mData.as<1>().DataAs<const uint8_t>();
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}
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auto BigBuffer::TryAllocBuffer(size_t aSize) -> Maybe<Storage> {
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if (aSize <= kShmemThreshold) {
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auto mem = UniqueFreePtr<uint8_t[]>{
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reinterpret_cast<uint8_t*>(malloc(aSize))}; // Fallible!
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if (!mem) return {};
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return Some(AsVariant(std::move(mem)));
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}
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size_t capacity = shared_memory::PageAlignedSize(aSize);
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auto mapping = shared_memory::Create(capacity).MapWithHandle();
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if (!mapping) {
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return {};
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}
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return Some(AsVariant(std::move(mapping)));
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}
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} // namespace mozilla::ipc
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void IPC::ParamTraits<mozilla::ipc::BigBuffer>::Write(MessageWriter* aWriter,
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paramType&& aParam) {
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using namespace mozilla::ipc;
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size_t size = std::exchange(aParam.mSize, 0);
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auto data = std::exchange(aParam.mData, BigBuffer::NoData());
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WriteParam(aWriter, size);
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bool isShmem = data.is<1>();
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WriteParam(aWriter, isShmem);
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if (isShmem) {
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auto handle = data.as<1>().Handle().Clone();
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if (!handle) {
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aWriter->FatalError("Failed to write data shmem");
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} else {
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WriteParam(aWriter, std::move(handle));
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}
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} else {
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aWriter->WriteBytes(data.as<0>().get(), size);
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}
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}
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bool IPC::ParamTraits<mozilla::ipc::BigBuffer>::Read(MessageReader* aReader,
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paramType* aResult) {
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using namespace mozilla::ipc;
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size_t size = 0;
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bool isShmem = false;
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if (!ReadParam(aReader, &size) || !ReadParam(aReader, &isShmem)) {
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aReader->FatalError("Failed to read data size and format");
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return false;
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}
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if (isShmem) {
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MutableSharedMemoryHandle handle;
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size_t expected_size = shared_memory::PageAlignedSize(size);
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if (!ReadParam(aReader, &handle) || !handle) {
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aReader->FatalError("Failed to read data shmem");
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return false;
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}
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auto mapping = std::move(handle).MapWithHandle();
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if (!mapping || mapping.Size() != expected_size) {
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aReader->FatalError("Failed to map data shmem");
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return false;
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}
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*aResult = BigBuffer(BigBuffer::Adopt{}, std::move(mapping), size);
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return true;
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}
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mozilla::UniqueFreePtr<uint8_t[]> buf{
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reinterpret_cast<uint8_t*>(malloc(size))};
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if (!buf) {
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aReader->FatalError("Failed to allocate data buffer");
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return false;
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}
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if (!aReader->ReadBytesInto(buf.get(), size)) {
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aReader->FatalError("Failed to read data");
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return false;
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}
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*aResult = BigBuffer(BigBuffer::Adopt{}, buf.release(), size);
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return true;
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}
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