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d6571f54d8
The internal reuse of FixedMemoryStream makes this straightforward. There alread is one user of the new API, demonstrating the need for this change beyond what I said out to use it for :^)
62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2023, kleines Filmröllchen <filmroellchen@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/ByteBuffer.h>
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#include <AK/Error.h>
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#include <AK/MemoryStream.h>
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#include <AK/Noncopyable.h>
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#include <AK/NonnullOwnPtr.h>
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#include <AK/RefCounted.h>
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#include <LibCore/Forward.h>
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namespace Core {
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class MappedFile : public FixedMemoryStream {
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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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// Reflects a simplified version of mmap protection and flags.
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enum class OpenMode {
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ReadOnly,
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ReadWrite,
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};
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static ErrorOr<NonnullOwnPtr<MappedFile>> map(StringView path, OpenMode mode = OpenMode::ReadOnly);
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static ErrorOr<NonnullOwnPtr<MappedFile>> map_from_file(NonnullOwnPtr<Core::File>, StringView path);
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static ErrorOr<NonnullOwnPtr<MappedFile>> map_from_fd_and_close(int fd, StringView path, OpenMode mode = OpenMode::ReadOnly);
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virtual ~MappedFile();
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// Non-stream APIs for using MappedFile as a simple POSIX API wrapper.
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void* data() { return m_data; }
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void const* data() const { return m_data; }
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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, OpenMode);
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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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class SharedMappedFile : public RefCounted<SharedMappedFile> {
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public:
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explicit SharedMappedFile(NonnullOwnPtr<MappedFile> file)
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: m_file(move(file))
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{
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}
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MappedFile const& operator->() const { return *m_file; }
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MappedFile& operator->() { return *m_file; }
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private:
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NonnullOwnPtr<MappedFile> m_file;
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};
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}
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