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Add new PacketBuffer class for buffered peers

This commit is contained in:
Fabio Alessandrelli 2018-11-03 05:43:00 +01:00
parent c0435959da
commit 4847b5bff5
1 changed files with 122 additions and 0 deletions
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122
modules/websocket/packet_buffer.h Normal file
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/*************************************************************************/
/* packet_buffer.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2018 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/os/copymem.h"
#include "core/ring_buffer.h"
template <class T>
class PacketBuffer {
private:
typedef struct {
uint32_t size;
T info;
} _Packet;
RingBuffer<_Packet> _packets;
RingBuffer<uint8_t> _payload;
public:
Error write_packet(const uint8_t *p_payload, uint32_t p_size, const T *p_info) {
#ifdef TOOLS_ENABLED
// Verbose buffer warnings
if (p_payload && _payload.space_left() < p_size) {
ERR_PRINT("Buffer payload full! Dropping data.");
ERR_FAIL_V(ERR_OUT_OF_MEMORY);
}
if (p_info && _packets.space_left() < 1) {
ERR_PRINT("Too many packets in queue! Dropping data.");
ERR_FAIL_V(ERR_OUT_OF_MEMORY);
}
#else
ERR_FAIL_COND_V(p_payload && _payload.space_left() < p_size, ERR_OUT_OF_MEMORY);
ERR_FAIL_COND_V(p_info && _packets.space_left() < 1, ERR_OUT_OF_MEMORY);
#endif
// If p_info is NULL, only the payload is written
if (p_info) {
_Packet p;
p.size = p_size;
copymem(&p.info, p_info, sizeof(T));
_packets.write(p);
}
// If p_payload is NULL, 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(_packets.data_left() < 1, ERR_UNAVAILABLE);
_Packet p;
_packets.read(&p, 1);
ERR_FAIL_COND_V(_payload.data_left() < p.size, ERR_BUG);
ERR_FAIL_COND_V(p_bytes < p.size, ERR_OUT_OF_MEMORY);
r_read = p.size;
copymem(r_info, &p.info, sizeof(T));
_payload.read(r_payload, p.size);
return OK;
}
void discard_payload(int p_size) {
_packets.decrease_write(p_size);
}
void resize(int p_pkt_shift, int p_buf_shift) {
_packets.resize(p_pkt_shift);
_payload.resize(p_buf_shift);
}
int packets_left() const {
return _packets.data_left();
}
void clear() {
_payload.resize(0);
_packets.resize(0);
}
PacketBuffer() {
clear();
}
~PacketBuffer() {
clear();
}
};
#endif // PACKET_BUFFER_H