57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SANDBOXED_API_EMBED_FILE_H_
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#define SANDBOXED_API_EMBED_FILE_H_
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#include "sandboxed_api/file_toc.h"
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#include "absl/base/thread_annotations.h"
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#include "absl/container/flat_hash_map.h"
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#include "absl/synchronization/mutex.h"
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namespace sapi {
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// The class provides primitives for converting FileToc structures into
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// executable files.
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class EmbedFile {
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public:
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EmbedFile(const EmbedFile&) = delete;
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EmbedFile& operator=(const EmbedFile&) = delete;
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// Returns the pointer to the per-process EmbedFile object.
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static EmbedFile* instance();
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// Returns a file-descriptor for a given FileToc.
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int GetFdForFileToc(const FileToc* toc);
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// Returns a duplicated file-descriptor for a given FileToc.
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int GetDupFdForFileToc(const FileToc* toc);
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private:
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// Creates an executable file for a given FileToc, and return its
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// file-descriptors (-1 in case of errors).
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static int CreateFdForFileToc(const FileToc* toc);
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EmbedFile() = default;
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// List of File TOCs and corresponding file-descriptors.
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absl::flat_hash_map<const FileToc*, int> file_tocs_
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ABSL_GUARDED_BY(file_tocs_mutex_);
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absl::Mutex file_tocs_mutex_;
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};
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} // namespace sapi
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#endif // SANDBOXED_API_EMBED_FILE_H_
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