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2f3b901f7f
Let's adapt this class a bit better to how it's actually being used. Instead of having valid/invalid states and storing an error in case it's invalid, a MappedFile is now always valid, and the factory function that creates it will return an OSError if mapping fails.
61 lines
2.1 KiB
C++
61 lines
2.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Noncopyable.h>
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#include <AK/NonnullRefPtr.h>
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#include <AK/OSError.h>
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#include <AK/RefCounted.h>
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#include <AK/Result.h>
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namespace AK {
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class MappedFile : public RefCounted<MappedFile> {
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AK_MAKE_NONCOPYABLE(MappedFile);
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AK_MAKE_NONMOVABLE(MappedFile);
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public:
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static Result<NonnullRefPtr<MappedFile>, OSError> map(const StringView& path);
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~MappedFile();
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void* data() { return m_data; }
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const void* data() const { return m_data; }
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size_t size() const { return m_size; }
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ReadonlyBytes bytes() const { return { m_data, m_size }; }
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private:
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explicit MappedFile(void*, size_t);
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void* m_data { nullptr };
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size_t m_size { 0 };
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};
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}
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using AK::MappedFile;
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