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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_ASH_COMPONENTS_TELEMETRY_EXTENSION_DIAGNOSTICS_MOJO_UTILS_H_
#define CHROMEOS_ASH_COMPONENTS_TELEMETRY_EXTENSION_DIAGNOSTICS_MOJO_UTILS_H_
#include <string>
#include "mojo/public/cpp/system/handle.h"
namespace ash::converters::diagnostics {
// This class is created to enable its functions (i.e.
// GetStringPieceFromMojoHandle) to use base::ScopedAllowBlocking's private
// constructor. That is achieved by making this class friend of
// base::ScopedAllowBlocking.
// Non-goal: This class is not created to group static member functions (as
// discouraged by chromium style guide).
class MojoUtils final {
public:
// Disallow all implicit constructors.
MojoUtils() = delete;
MojoUtils(const MojoUtils& mojo_utils) = delete;
MojoUtils& operator=(const MojoUtils& mojo_utils) = delete;
// Allows to get access to the buffer in read only shared memory. It converts
// mojo::Handle to base::ReadOnlySharedMemoryMapping and returns a string.
// Returns an empty string if error.
//
// |handle| must be a valid mojo handle of the non-empty buffer in the shared
// memory.
static std::string GetStringFromMojoHandle(mojo::ScopedHandle handle);
};
} // namespace ash::converters::diagnostics
#endif // CHROMEOS_ASH_COMPONENTS_TELEMETRY_EXTENSION_DIAGNOSTICS_MOJO_UTILS_H_
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