50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
/*
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* Copyright (c) 2021, 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/Error.h>
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#include <AK/NonnullOwnPtr.h>
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#include <AK/OwnPtr.h>
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#include <AK/Span.h>
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#include <AK/TypedTransfer.h>
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#include <LibCore/Stream.h>
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namespace Core::Stream {
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/// A stream class that allows for reading/writing on a preallocated memory area
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/// using a single read/write head.
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class FixedMemoryStream final : public SeekableStream {
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public:
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static ErrorOr<NonnullOwnPtr<FixedMemoryStream>> construct(Bytes bytes);
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static ErrorOr<NonnullOwnPtr<FixedMemoryStream>> construct(ReadonlyBytes bytes);
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virtual bool is_eof() const override;
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virtual bool is_open() const override;
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virtual void close() override;
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virtual ErrorOr<void> truncate(off_t) override;
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virtual ErrorOr<Bytes> read(Bytes bytes) override;
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virtual ErrorOr<off_t> seek(i64 offset, SeekMode seek_mode = SeekMode::SetPosition) override;
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virtual ErrorOr<size_t> write(ReadonlyBytes bytes) override;
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virtual ErrorOr<void> write_entire_buffer(ReadonlyBytes bytes) override;
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Bytes bytes();
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ReadonlyBytes bytes() const;
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size_t offset() const;
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size_t remaining() const;
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private:
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explicit FixedMemoryStream(Bytes bytes);
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explicit FixedMemoryStream(ReadonlyBytes bytes);
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Bytes m_bytes;
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size_t m_offset { 0 };
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bool m_writing_enabled { true };
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};
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}
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