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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#ifndef MOJO_CORE_IPCZ_DRIVER_SHARED_BUFFER_MAPPING_H_
#define MOJO_CORE_IPCZ_DRIVER_SHARED_BUFFER_MAPPING_H_
#include <cstdint>
#include <memory>
#include "base/containers/span.h"
#include "base/memory/platform_shared_memory_region.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/shared_memory_mapping.h"
#include "mojo/core/ipcz_driver/object.h"
#include "mojo/core/system_impl_export.h"
#include "mojo/public/cpp/platform/platform_handle.h"
namespace mojo::core::ipcz_driver {
// An active memory mapping of a driver-controlled shared buffer. Note that this
// is only used to manage read/writable mappings of unsafe regions by ipcz
// internals.
class MOJO_SYSTEM_IMPL_EXPORT SharedBufferMapping
: public Object<SharedBufferMapping> {
public:
SharedBufferMapping(std::unique_ptr<base::SharedMemoryMapping> mapping,
void* memory);
static constexpr Type object_type() { return kSharedBufferMapping; }
void* memory() const { return memory_; }
size_t size() const { return mapping_->size(); }
base::span<uint8_t> bytes() const {
return base::span(static_cast<uint8_t*>(memory()), size());
}
static scoped_refptr<SharedBufferMapping> Create(
base::subtle::PlatformSharedMemoryRegion& region,
size_t offset,
size_t size);
// Maps the whole region.
static scoped_refptr<SharedBufferMapping> Create(
base::subtle::PlatformSharedMemoryRegion& region);
// Object:
void Close() override;
private:
~SharedBufferMapping() override;
std::unique_ptr<base::SharedMemoryMapping> mapping_;
raw_ptr<void> memory_;
};
} // namespace mojo::core::ipcz_driver
#endif // MOJO_CORE_IPCZ_DRIVER_SHARED_BUFFER_MAPPING_H_
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