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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.
#include "chromeos/ash/components/telemetry_extension/diagnostics/mojo_utils.h"
#include <string>
#include "base/files/file.h"
#include "base/memory/platform_shared_memory_region.h"
#include "base/memory/read_only_shared_memory_region.h"
#include "base/threading/thread_restrictions.h"
#include "mojo/public/c/system/types.h"
#include "mojo/public/cpp/system/handle.h"
#include "mojo/public/cpp/system/platform_handle.h"
namespace ash::converters::diagnostics {
// static
std::string MojoUtils::GetStringFromMojoHandle(mojo::ScopedHandle handle) {
base::ScopedPlatformFile platform_file;
auto result = mojo::UnwrapPlatformFile(std::move(handle), &platform_file);
if (result != MOJO_RESULT_OK) {
return "";
}
base::File file(std::move(platform_file));
size_t file_size = 0;
{
// TODO(b/322741627): Remove blocking operation from production code.
base::ScopedAllowBlocking allow_blocking;
file_size = file.GetLength();
}
if (file_size <= 0) {
return "";
}
base::subtle::PlatformSharedMemoryRegion platform_region =
base::subtle::PlatformSharedMemoryRegion::Take(
base::ScopedFD(file.TakePlatformFile()),
base::subtle::PlatformSharedMemoryRegion::Mode::kReadOnly, file_size,
base::UnguessableToken::Create());
base::ReadOnlySharedMemoryRegion shm_region =
base::ReadOnlySharedMemoryRegion::Deserialize(std::move(platform_region));
base::ReadOnlySharedMemoryMapping shm_mapping = shm_region.Map();
if (!shm_mapping.IsValid()) {
return "";
}
return std::string(shm_mapping.GetMemoryAs<char>(), shm_mapping.size());
}
} // namespace ash::converters::diagnostics
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