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/*
* Copyright (C) 2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <span>
#include <wtf/Forward.h>
#if HAVE(MMAP)
#include <wtf/MallocSpan.h>
#include <wtf/Mmap.h>
#endif
#if OS(WINDOWS)
#include <wtf/win/Win32Handle.h>
#endif
namespace WTF {
namespace FileSystemImpl {
enum class MappedFileMode : bool {
Shared,
Private,
};
class MappedFileData {
WTF_DEPRECATED_MAKE_FAST_ALLOCATED(MappedFileData);
public:
MappedFileData() = default;
WTF_EXPORT_PRIVATE ~MappedFileData();
MappedFileData(MappedFileData&&) = default;
MappedFileData& operator=(MappedFileData&&) = default;
#if HAVE(MMAP)
explicit MappedFileData(MallocSpan<uint8_t, Mmap>&&);
std::span<uint8_t> leakHandle() WARN_UNUSED_RETURN { return m_fileData.leakSpan(); }
explicit operator bool() const { return !!m_fileData; }
size_t size() const { return m_fileData.span().size(); }
std::span<const uint8_t> span() const LIFETIME_BOUND { return m_fileData.span(); }
std::span<uint8_t> mutableSpan() LIFETIME_BOUND { return m_fileData.mutableSpan(); }
#elif OS(WINDOWS)
MappedFileData(std::span<uint8_t>, Win32Handle&&);
const Win32Handle& fileMapping() const { return m_fileMapping; }
explicit operator bool() const { return !!m_fileData.data(); }
size_t size() const { return m_fileData.size(); }
std::span<const uint8_t> span() const { return m_fileData; }
std::span<uint8_t> mutableSpan() { return m_fileData; }
#endif
private:
#if HAVE(MMAP)
MallocSpan<uint8_t, Mmap> m_fileData;
#elif OS(WINDOWS)
std::span<uint8_t> m_fileData;
Win32Handle m_fileMapping;
#endif
};
} // namespace FileSystemImpl
} // namespace WTF
namespace FileSystem = WTF::FileSystemImpl;
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