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LibCore: Make MappedFile a Stream
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 :^)
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8 changed files with 266 additions and 25 deletions
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@ -7,7 +7,9 @@
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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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@ -15,25 +17,29 @@
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namespace Core {
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class MappedFile {
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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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static ErrorOr<NonnullOwnPtr<MappedFile>> map(StringView path);
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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);
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~MappedFile();
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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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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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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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