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https://github.com/godotengine/godot.git
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3114bda4e1
Ensure we never read more than we can store during poll. Raise default max packets to 4096 to maintain the same performance for the first 2048 packets.
133 lines
4.4 KiB
C++
133 lines
4.4 KiB
C++
/**************************************************************************/
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/* packet_buffer.h */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#ifndef PACKET_BUFFER_H
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#define PACKET_BUFFER_H
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#include "core/templates/ring_buffer.h"
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template <typename T>
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class PacketBuffer {
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private:
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typedef struct {
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uint32_t size;
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T info;
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} _Packet;
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Vector<_Packet> _packets;
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int _queued = 0;
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int _write_pos = 0;
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int _read_pos = 0;
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RingBuffer<uint8_t> _payload;
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public:
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Error write_packet(const uint8_t *p_payload, uint32_t p_size, const T *p_info) {
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ERR_FAIL_COND_V_MSG(p_payload && (uint32_t)_payload.space_left() < p_size, ERR_OUT_OF_MEMORY, "Buffer payload full! Dropping data.");
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ERR_FAIL_COND_V_MSG(p_info && _queued >= _packets.size(), ERR_OUT_OF_MEMORY, "Too many packets in queue! Dropping data.");
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// If p_info is nullptr, only the payload is written
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if (p_info) {
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ERR_FAIL_COND_V(_write_pos > _packets.size(), ERR_OUT_OF_MEMORY);
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_Packet p;
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p.size = p_size;
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p.info = *p_info;
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_packets.write[_write_pos] = p;
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_queued += 1;
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_write_pos++;
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if (_write_pos >= _packets.size()) {
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_write_pos = 0;
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}
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}
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// If p_payload is nullptr, only the packet information is written.
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if (p_payload) {
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_payload.write((const uint8_t *)p_payload, p_size);
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}
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return OK;
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}
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Error read_packet(uint8_t *r_payload, int p_bytes, T *r_info, int &r_read) {
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ERR_FAIL_COND_V(_queued < 1, ERR_UNAVAILABLE);
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_Packet p = _packets[_read_pos];
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_read_pos += 1;
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if (_read_pos >= _packets.size()) {
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_read_pos = 0;
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}
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_queued -= 1;
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ERR_FAIL_COND_V(_payload.data_left() < (int)p.size, ERR_BUG);
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ERR_FAIL_COND_V(p_bytes < (int)p.size, ERR_OUT_OF_MEMORY);
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r_read = p.size;
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memcpy(r_info, &p.info, sizeof(T));
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_payload.read(r_payload, p.size);
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return OK;
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}
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void resize(int p_buf_shift, int p_max_packets) {
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_payload.resize(p_buf_shift);
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_packets.resize(p_max_packets);
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_read_pos = 0;
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_write_pos = 0;
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_queued = 0;
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}
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int packets_left() const {
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return _queued;
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}
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int payload_space_left() const {
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return _payload.space_left();
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}
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int packets_space_left() const {
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return _packets.size() - _queued;
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}
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void clear() {
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_payload.resize(0);
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_packets.resize(0);
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_read_pos = 0;
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_write_pos = 0;
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_queued = 0;
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}
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PacketBuffer() {
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clear();
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}
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~PacketBuffer() {
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clear();
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}
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};
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#endif // PACKET_BUFFER_H
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