/*************************************************************************/ /* packet_buffer.h */ /*************************************************************************/ /* This file is part of: */ /* GODOT ENGINE */ /* https://godotengine.org */ /*************************************************************************/ /* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */ /* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */ /* */ /* Permission is hereby granted, free of charge, to any person obtaining */ /* a copy of this software and associated documentation files (the */ /* "Software"), to deal in the Software without restriction, including */ /* without limitation the rights to use, copy, modify, merge, publish, */ /* distribute, sublicense, and/or sell copies of the Software, and to */ /* permit persons to whom the Software is furnished to do so, subject to */ /* the following conditions: */ /* */ /* The above copyright notice and this permission notice shall be */ /* included in all copies or substantial portions of the Software. */ /* */ /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/ /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /*************************************************************************/ #ifndef PACKET_BUFFER_H #define PACKET_BUFFER_H #include "core/templates/ring_buffer.h" template <class T> class PacketBuffer { private: typedef struct { uint32_t size; T info; } _Packet; Vector<_Packet> _packets; int _queued = 0; int _write_pos = 0; int _read_pos = 0; RingBuffer<uint8_t> _payload; public: Error write_packet(const uint8_t *p_payload, uint32_t p_size, const T *p_info) { ERR_FAIL_COND_V_MSG(p_payload && (uint32_t)_payload.space_left() < p_size, ERR_OUT_OF_MEMORY, "Buffer payload full! Dropping data."); ERR_FAIL_COND_V_MSG(p_info && _queued >= _packets.size(), ERR_OUT_OF_MEMORY, "Too many packets in queue! Dropping data."); // If p_info is nullptr, only the payload is written if (p_info) { ERR_FAIL_COND_V(_write_pos > _packets.size(), ERR_OUT_OF_MEMORY); _Packet p; p.size = p_size; p.info = *p_info; _packets.write[_write_pos] = p; _queued += 1; _write_pos++; if (_write_pos >= _packets.size()) { _write_pos = 0; } } // If p_payload is nullptr, only the packet information is written. if (p_payload) { _payload.write((const uint8_t *)p_payload, p_size); } return OK; } Error read_packet(uint8_t *r_payload, int p_bytes, T *r_info, int &r_read) { ERR_FAIL_COND_V(_queued < 1, ERR_UNAVAILABLE); _Packet p = _packets[_read_pos]; _read_pos += 1; if (_read_pos >= _packets.size()) { _read_pos = 0; } _queued -= 1; ERR_FAIL_COND_V(_payload.data_left() < (int)p.size, ERR_BUG); ERR_FAIL_COND_V(p_bytes < (int)p.size, ERR_OUT_OF_MEMORY); r_read = p.size; memcpy(r_info, &p.info, sizeof(T)); _payload.read(r_payload, p.size); return OK; } void resize(int p_buf_shift, int p_max_packets) { _payload.resize(p_buf_shift); _packets.resize(p_max_packets); _read_pos = 0; _write_pos = 0; _queued = 0; } int packets_left() const { return _queued; } void clear() { _payload.resize(0); _packets.resize(0); _read_pos = 0; _write_pos = 0; _queued = 0; } PacketBuffer() { clear(); } ~PacketBuffer() { clear(); } }; #endif // PACKET_BUFFER_H