26504d84bb
Allow MappedFile to expose a byte range within an fd. It maps the page-aligned region required by mmap internally. Add ImmutableBytes as a small shared holder for either owned bytes or a mapped file. This lets cache code thread file-backed response bodies through without copying response data into anonymous memory. Cover non-page-aligned ranges, empty ranges, invalid ranges, and mapped ImmutableBytes in TestLibCoreMappedFile.
79 lines
1.8 KiB
C++
79 lines
1.8 KiB
C++
/*
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* Copyright (c) 2026-present, the Ladybird developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibCore/ImmutableBytes.h>
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namespace Core {
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ErrorOr<ImmutableBytes> ImmutableBytes::copy(ReadonlyBytes bytes)
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{
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return adopt(TRY(ByteBuffer::copy(bytes)));
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}
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ImmutableBytes ImmutableBytes::adopt(ByteBuffer bytes)
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{
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return ImmutableBytes { adopt_ref(*new Impl(move(bytes))) };
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}
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ImmutableBytes ImmutableBytes::adopt_mapped_file(NonnullOwnPtr<MappedFile> mapped_file)
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{
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return ImmutableBytes { adopt_ref(*new Impl(move(mapped_file))) };
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}
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ErrorOr<ImmutableBytes> ImmutableBytes::map_from_fd_range_and_close(int fd, StringView path, off_t offset, size_t size)
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{
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return adopt_mapped_file(TRY(MappedFile::map_from_fd_range_and_close(fd, path, offset, size)));
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}
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bool ImmutableBytes::is_file_backed() const
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{
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return m_impl && m_impl->is_file_backed();
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}
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ReadonlyBytes ImmutableBytes::bytes() const
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{
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if (!m_impl)
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return {};
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return m_impl->bytes();
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}
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ErrorOr<ByteBuffer> ImmutableBytes::copy_to_byte_buffer() const
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{
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return ByteBuffer::copy(bytes());
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}
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ImmutableBytes::ImmutableBytes(NonnullRefPtr<Impl> impl)
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: m_impl(move(impl))
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{
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}
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ImmutableBytes::Impl::Impl(ByteBuffer bytes)
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: m_storage(move(bytes))
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{
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}
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ImmutableBytes::Impl::Impl(NonnullOwnPtr<MappedFile> mapped_file)
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: m_storage(move(mapped_file))
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{
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}
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bool ImmutableBytes::Impl::is_file_backed() const
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{
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return m_storage.has<NonnullOwnPtr<MappedFile>>();
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}
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ReadonlyBytes ImmutableBytes::Impl::bytes() const
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{
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return m_storage.visit(
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[](ByteBuffer const& bytes) -> ReadonlyBytes {
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return bytes.bytes();
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},
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[](NonnullOwnPtr<MappedFile> const& mapped_file) -> ReadonlyBytes {
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return mapped_file->bytes();
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});
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}
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}
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