// Copyright 2018 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "base/memory/writable_shared_memory_region.h" #include #include "build/build_config.h" namespace base { WritableSharedMemoryRegion::CreateFunction* WritableSharedMemoryRegion::create_hook_ = nullptr; // static WritableSharedMemoryRegion WritableSharedMemoryRegion::Create(size_t size) { if (create_hook_) return create_hook_(size); subtle::PlatformSharedMemoryRegion handle = subtle::PlatformSharedMemoryRegion::CreateWritable(size); return WritableSharedMemoryRegion(std::move(handle)); } // static WritableSharedMemoryRegion WritableSharedMemoryRegion::Deserialize( subtle::PlatformSharedMemoryRegion handle) { return WritableSharedMemoryRegion(std::move(handle)); } // static subtle::PlatformSharedMemoryRegion WritableSharedMemoryRegion::TakeHandleForSerialization( WritableSharedMemoryRegion region) { return std::move(region.handle_); } // static ReadOnlySharedMemoryRegion WritableSharedMemoryRegion::ConvertToReadOnly( WritableSharedMemoryRegion region) { subtle::PlatformSharedMemoryRegion handle = std::move(region.handle_); if (!handle.ConvertToReadOnly()) return {}; return ReadOnlySharedMemoryRegion::Deserialize(std::move(handle)); } UnsafeSharedMemoryRegion WritableSharedMemoryRegion::ConvertToUnsafe( WritableSharedMemoryRegion region) { subtle::PlatformSharedMemoryRegion handle = std::move(region.handle_); if (!handle.ConvertToUnsafe()) return {}; return UnsafeSharedMemoryRegion::Deserialize(std::move(handle)); } WritableSharedMemoryRegion::WritableSharedMemoryRegion() = default; WritableSharedMemoryRegion::WritableSharedMemoryRegion( WritableSharedMemoryRegion&& region) = default; WritableSharedMemoryRegion& WritableSharedMemoryRegion::operator=( WritableSharedMemoryRegion&& region) = default; WritableSharedMemoryRegion::~WritableSharedMemoryRegion() = default; WritableSharedMemoryMapping WritableSharedMemoryRegion::Map( SharedMemoryMapper* mapper) const { return MapAt(0, handle_.GetSize(), mapper); } WritableSharedMemoryMapping WritableSharedMemoryRegion::MapAt( uint64_t offset, size_t size, SharedMemoryMapper* mapper) const { if (!IsValid()) return {}; auto result = handle_.MapAt(offset, size, mapper); if (!result.has_value()) return {}; return WritableSharedMemoryMapping(result.value(), size, handle_.GetGUID(), mapper); } bool WritableSharedMemoryRegion::IsValid() const { return handle_.IsValid(); } WritableSharedMemoryRegion::WritableSharedMemoryRegion( subtle::PlatformSharedMemoryRegion handle) : handle_(std::move(handle)) { if (handle_.IsValid()) { CHECK_EQ(handle_.GetMode(), subtle::PlatformSharedMemoryRegion::Mode::kWritable); } } } // namespace base