mirror of
https://github.com/godotengine/godot
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125 lines
4.2 KiB
C++
125 lines
4.2 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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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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