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// Copyright 2018 The Chromium Authors
// 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 <utility>
#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
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