mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-10 13:00:29 +03:00
ae3ffdd521
This patch adds the `USING_AK_GLOBALLY` macro which is enabled by default, but can be overridden by build flags. This is a step towards integrating Jakt and AK types.
126 lines
3.0 KiB
C++
126 lines
3.0 KiB
C++
/*
|
|
* Copyright (c) 2020, the SerenityOS developers.
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/CircularQueue.h>
|
|
#include <AK/Stream.h>
|
|
|
|
namespace AK {
|
|
|
|
// FIXME: There are a lot of raw loops here, that's not necessary an issue but it
|
|
// has to be verified that the optimizer is able to insert memcpy instead.
|
|
template<size_t Capacity>
|
|
class CircularDuplexStream : public AK::DuplexStream {
|
|
public:
|
|
size_t write(ReadonlyBytes bytes) override
|
|
{
|
|
auto const nwritten = min(bytes.size(), Capacity - m_queue.size());
|
|
|
|
for (size_t idx = 0; idx < nwritten; ++idx)
|
|
m_queue.enqueue(bytes[idx]);
|
|
|
|
m_total_written += nwritten;
|
|
return nwritten;
|
|
}
|
|
|
|
bool write_or_error(ReadonlyBytes bytes) override
|
|
{
|
|
if (Capacity - m_queue.size() < bytes.size()) {
|
|
set_recoverable_error();
|
|
return false;
|
|
}
|
|
|
|
auto const nwritten = write(bytes);
|
|
VERIFY(nwritten == bytes.size());
|
|
return true;
|
|
}
|
|
|
|
size_t read(Bytes bytes) override
|
|
{
|
|
if (has_any_error())
|
|
return 0;
|
|
|
|
auto const nread = min(bytes.size(), m_queue.size());
|
|
|
|
for (size_t idx = 0; idx < nread; ++idx)
|
|
bytes[idx] = m_queue.dequeue();
|
|
|
|
return nread;
|
|
}
|
|
|
|
size_t read(Bytes bytes, size_t seekback)
|
|
{
|
|
if (seekback > Capacity || seekback > m_total_written) {
|
|
set_recoverable_error();
|
|
return 0;
|
|
}
|
|
|
|
auto const nread = min(bytes.size(), seekback);
|
|
|
|
for (size_t idx = 0; idx < nread; ++idx) {
|
|
auto const index = (m_total_written - seekback + idx) % Capacity;
|
|
bytes[idx] = m_queue.m_storage[index];
|
|
}
|
|
|
|
return nread;
|
|
}
|
|
|
|
bool read_or_error(Bytes bytes) override
|
|
{
|
|
if (m_queue.size() < bytes.size()) {
|
|
set_recoverable_error();
|
|
return false;
|
|
}
|
|
|
|
read(bytes);
|
|
return true;
|
|
}
|
|
|
|
bool discard_or_error(size_t count) override
|
|
{
|
|
if (m_queue.size() < count) {
|
|
set_recoverable_error();
|
|
return false;
|
|
}
|
|
|
|
for (size_t idx = 0; idx < count; ++idx)
|
|
m_queue.dequeue();
|
|
|
|
return true;
|
|
}
|
|
|
|
bool unreliable_eof() const override { return eof(); }
|
|
bool eof() const { return m_queue.size() == 0; }
|
|
|
|
size_t remaining_contiguous_space() const
|
|
{
|
|
return min(Capacity - m_queue.size(), m_queue.capacity() - (m_queue.head_index() + m_queue.size()) % Capacity);
|
|
}
|
|
|
|
Bytes reserve_contiguous_space(size_t count)
|
|
{
|
|
VERIFY(count <= remaining_contiguous_space());
|
|
|
|
Bytes bytes { m_queue.m_storage + (m_queue.head_index() + m_queue.size()) % Capacity, count };
|
|
|
|
m_queue.m_size += count;
|
|
m_total_written += count;
|
|
|
|
return bytes;
|
|
}
|
|
|
|
private:
|
|
CircularQueue<u8, Capacity> m_queue;
|
|
size_t m_total_written { 0 };
|
|
};
|
|
|
|
}
|
|
|
|
#if USING_AK_GLOBALLY
|
|
using AK::CircularDuplexStream;
|
|
#endif
|