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// Copyright 2023 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/nix/mime_util_xdg.h"
#include <stdlib.h>
#include <string>
#include "base/containers/span.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_temp_dir.h"
#include "base/logging.h"
// Entry point for LibFuzzer.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data_ptr, size_t size) {
// SAFETY: LibFuzzer provides a valid pointer/size pair.
auto data = UNSAFE_BUFFERS(base::span(data_ptr, size));
base::ScopedTempDir temp_dir;
if (!temp_dir.CreateUniqueTempDir()) {
// Not a fuzzer error, so we return 0.
LOG(ERROR) << "Failed to create temp dir";
return 0;
}
// The parser reads file $XDG_DATA_DIRS/mime/mime.cache.
setenv("XDG_DATA_DIRS", temp_dir.GetPath().value().c_str(), 1);
base::FilePath mime_dir = temp_dir.GetPath().Append("mime");
base::FilePath mime_cache = mime_dir.Append("mime.cache");
if (!base::CreateDirectory(mime_dir) || !base::WriteFile(mime_cache, data)) {
LOG(ERROR) << "Failed to create " << mime_cache;
// Not a fuzzer error, so we return 0.
return 0;
}
base::FilePath dummy_path("foo.txt");
std::string type = base::nix::GetFileMimeType(dummy_path);
return 0;
}
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