mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-21 23:20:20 +00:00
8b56d82865
Instead of reading bytes from the output stream into a buffer, just to immediately write them back out, we can skip the middle-man and copy the bytes directly into the output buffer.
63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
/*
|
|
* Copyright (c) 2022, Lucas Chollet <lucas.chollet@free.fr>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/ByteBuffer.h>
|
|
#include <AK/Error.h>
|
|
#include <AK/Noncopyable.h>
|
|
|
|
namespace AK {
|
|
|
|
class CircularBuffer {
|
|
AK_MAKE_NONCOPYABLE(CircularBuffer);
|
|
|
|
public:
|
|
static ErrorOr<CircularBuffer> create_empty(size_t size);
|
|
static ErrorOr<CircularBuffer> create_initialized(ByteBuffer);
|
|
|
|
CircularBuffer(CircularBuffer&& other) = default;
|
|
CircularBuffer& operator=(CircularBuffer&& other) = default;
|
|
|
|
~CircularBuffer() = default;
|
|
|
|
size_t write(ReadonlyBytes bytes);
|
|
Bytes read(Bytes bytes);
|
|
ErrorOr<void> discard(size_t discarded_bytes);
|
|
ErrorOr<size_t> fill_from_stream(Stream&);
|
|
|
|
/// Compared to `read()`, this starts reading from an offset that is `distance` bytes
|
|
/// before the current write pointer and allows for reading already-read data.
|
|
ErrorOr<Bytes> read_with_seekback(Bytes bytes, size_t distance);
|
|
|
|
ErrorOr<void> copy_from_seekback(size_t distance, size_t length);
|
|
|
|
[[nodiscard]] size_t empty_space() const;
|
|
[[nodiscard]] size_t used_space() const;
|
|
[[nodiscard]] size_t capacity() const;
|
|
[[nodiscard]] size_t seekback_limit() const;
|
|
|
|
Optional<size_t> offset_of(StringView needle, Optional<size_t> from = {}, Optional<size_t> until = {}) const;
|
|
|
|
void clear();
|
|
|
|
private:
|
|
CircularBuffer(ByteBuffer);
|
|
|
|
[[nodiscard]] bool is_wrapping_around() const;
|
|
|
|
[[nodiscard]] Bytes next_write_span();
|
|
[[nodiscard]] ReadonlyBytes next_read_span() const;
|
|
[[nodiscard]] ReadonlyBytes next_read_span_with_seekback(size_t distance) const;
|
|
|
|
ByteBuffer m_buffer {};
|
|
|
|
size_t m_reading_head {};
|
|
size_t m_used_space {};
|
|
size_t m_seekback_limit {};
|
|
};
|
|
|
|
}
|