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.
54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
/*
|
|
* Copyright (c) 2026-present, the Ladybird developers.
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/ByteBuffer.h>
|
|
#include <AK/NonnullRefPtr.h>
|
|
#include <AK/RefCounted.h>
|
|
#include <AK/RefPtr.h>
|
|
#include <AK/Variant.h>
|
|
#include <LibCore/Export.h>
|
|
#include <LibCore/MappedFile.h>
|
|
|
|
namespace Core {
|
|
|
|
class CORE_API ImmutableBytes {
|
|
public:
|
|
static ErrorOr<ImmutableBytes> copy(ReadonlyBytes);
|
|
static ImmutableBytes adopt(ByteBuffer);
|
|
static ImmutableBytes adopt_mapped_file(NonnullOwnPtr<MappedFile>);
|
|
static ErrorOr<ImmutableBytes> map_from_fd_range_and_close(int fd, StringView path, off_t offset, size_t size);
|
|
|
|
ImmutableBytes() = default;
|
|
|
|
[[nodiscard]] bool is_empty() const { return size() == 0; }
|
|
[[nodiscard]] bool is_valid() const { return m_impl; }
|
|
[[nodiscard]] bool is_file_backed() const;
|
|
|
|
[[nodiscard]] size_t size() const { return bytes().size(); }
|
|
[[nodiscard]] ReadonlyBytes bytes() const LIFETIME_BOUND;
|
|
[[nodiscard]] ErrorOr<ByteBuffer> copy_to_byte_buffer() const;
|
|
|
|
private:
|
|
class Impl final : public RefCounted<Impl> {
|
|
public:
|
|
explicit Impl(ByteBuffer);
|
|
explicit Impl(NonnullOwnPtr<MappedFile>);
|
|
|
|
[[nodiscard]] bool is_file_backed() const;
|
|
[[nodiscard]] ReadonlyBytes bytes() const LIFETIME_BOUND;
|
|
|
|
private:
|
|
Variant<ByteBuffer, NonnullOwnPtr<MappedFile>> m_storage;
|
|
};
|
|
|
|
explicit ImmutableBytes(NonnullRefPtr<Impl>);
|
|
|
|
RefPtr<Impl> m_impl;
|
|
};
|
|
|
|
}
|