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/*
* 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)
{
operator=(move(other));
}
CircularBuffer& operator=(CircularBuffer&& other)
{
if (&other == this)
return *this;
swap(m_buffer, other.m_buffer);
swap(m_reading_head, other.m_reading_head);
swap(m_used_space, other.m_used_space);
return *this;
}
~CircularBuffer() = default;
size_t write(ReadonlyBytes bytes);
Bytes read(Bytes bytes);
ErrorOr<void> discard(size_t discarded_bytes);
[[nodiscard]] size_t empty_space() const;
[[nodiscard]] size_t used_space() const;
[[nodiscard]] size_t capacity() const;
Optional<size_t> offset_of(StringView needle, 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;
ByteBuffer m_buffer {};
size_t m_reading_head {};
size_t m_used_space {};
};
}
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