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/*************************************************************************/
/* packet_peer.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur. */
/* */
/* 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. */
/*************************************************************************/
#include "packet_peer.h"
#include "io/marshalls.h"
#include "globals.h"
/* helpers / binders */
PacketPeer::PacketPeer() {
last_get_error=OK;
}
Error PacketPeer::get_packet_buffer(DVector<uint8_t> &r_buffer) const {
const uint8_t *buffer;
int buffer_size;
Error err = get_packet(&buffer,buffer_size);
if (err)
return err;
r_buffer.resize(buffer_size);
if (buffer_size==0)
return OK;
DVector<uint8_t>::Write w = r_buffer.write();
for(int i=0;i<buffer_size;i++)
w[i]=buffer[i];
return OK;
}
Error PacketPeer::put_packet_buffer(const DVector<uint8_t> &p_buffer) {
int len = p_buffer.size();
if (len==0)
return OK;
DVector<uint8_t>::Read r = p_buffer.read();
return put_packet(&r[0],len);
}
Error PacketPeer::get_var(Variant &r_variant) const {
const uint8_t *buffer;
int buffer_size;
Error err = get_packet(&buffer,buffer_size);
if (err)
return err;
return decode_variant(r_variant,buffer,buffer_size);
}
Error PacketPeer::put_var(const Variant& p_packet) {
int len;
Error err = encode_variant(p_packet,NULL,len); // compute len first
if (err)
return err;
if (len==0)
return OK;
uint8_t *buf = (uint8_t*)alloca(len);
ERR_FAIL_COND_V(!buf,ERR_OUT_OF_MEMORY);
err = encode_variant(p_packet,buf,len);
ERR_FAIL_COND_V(err, err);
return put_packet(buf, len);
}
Variant PacketPeer::_bnd_get_var() const {
Variant var;
get_var(var);
return var;
};
Error PacketPeer::_put_packet(const DVector<uint8_t> &p_buffer) {
return put_packet_buffer(p_buffer);
}
DVector<uint8_t> PacketPeer::_get_packet() const {
DVector<uint8_t> raw;
last_get_error=get_packet_buffer(raw);
return raw;
}
Error PacketPeer::_get_packet_error() const {
return last_get_error;
}
void PacketPeer::_bind_methods() {
ObjectTypeDB::bind_method(_MD("get_var"),&PacketPeer::_bnd_get_var);
ObjectTypeDB::bind_method(_MD("put_var", "var:Variant"),&PacketPeer::put_var);
ObjectTypeDB::bind_method(_MD("get_packet"),&PacketPeer::_get_packet);
ObjectTypeDB::bind_method(_MD("put_packet:Error", "buffer"),&PacketPeer::_put_packet);
ObjectTypeDB::bind_method(_MD("get_packet_error:Error"),&PacketPeer::_get_packet_error);
ObjectTypeDB::bind_method(_MD("get_available_packet_count"),&PacketPeer::get_available_packet_count);
};
/***************/
void PacketPeerStream::_set_stream_peer(REF p_peer) {
ERR_FAIL_COND(p_peer.is_null());
set_stream_peer(p_peer);
}
void PacketPeerStream::_bind_methods() {
ObjectTypeDB::bind_method(_MD("set_stream_peer","peer:StreamPeer"),&PacketPeerStream::_set_stream_peer);
}
Error PacketPeerStream::_poll_buffer() const {
ERR_FAIL_COND_V(peer.is_null(),ERR_UNCONFIGURED);
int read = 0;
Error err = peer->get_partial_data(&temp_buffer[0], ring_buffer.space_left(), read);
if (err)
return err;
if (read==0)
return OK;
int w = ring_buffer.write(&temp_buffer[0],read);
ERR_FAIL_COND_V(w!=read,ERR_BUG);
return OK;
}
int PacketPeerStream::get_available_packet_count() const {
_poll_buffer();
uint32_t remaining = ring_buffer.data_left();
int ofs=0;
int count=0;
while(remaining>=4) {
uint8_t lbuf[4];
ring_buffer.copy(lbuf,ofs,4);
uint32_t len = decode_uint32(lbuf);
remaining-=4;
ofs+=4;
if (len>remaining)
break;
remaining-=len;
ofs+=len;
count++;
}
return count;
}
Error PacketPeerStream::get_packet(const uint8_t **r_buffer,int &r_buffer_size) const {
ERR_FAIL_COND_V(peer.is_null(),ERR_UNCONFIGURED);
_poll_buffer();
int remaining = ring_buffer.data_left();
ERR_FAIL_COND_V(remaining<4,ERR_UNAVAILABLE);
uint8_t lbuf[4];
ring_buffer.copy(lbuf,0,4);
remaining-=4;
uint32_t len = decode_uint32(lbuf);
ERR_FAIL_COND_V(remaining<(int)len,ERR_UNAVAILABLE);
ring_buffer.read(lbuf,4); //get rid of first 4 bytes
ring_buffer.read(&temp_buffer[0],len); // read packet
*r_buffer=&temp_buffer[0];
r_buffer_size=len;
return OK;
}
Error PacketPeerStream::put_packet(const uint8_t *p_buffer,int p_buffer_size) {
ERR_FAIL_COND_V(peer.is_null(),ERR_UNCONFIGURED);
Error err = _poll_buffer(); //won't hurt to poll here too
if (err)
return err;
if (p_buffer_size==0)
return OK;
ERR_FAIL_COND_V( p_buffer_size<0, ERR_INVALID_PARAMETER);
ERR_FAIL_COND_V( p_buffer_size+4 > temp_buffer.size(), ERR_INVALID_PARAMETER );
encode_uint32(p_buffer_size,&temp_buffer[0]);
uint8_t *dst=&temp_buffer[4];
for(int i=0;i<p_buffer_size;i++)
dst[i]=p_buffer[i];
return peer->put_data(&temp_buffer[0],p_buffer_size+4);
}
int PacketPeerStream::get_max_packet_size() const {
return temp_buffer.size();
}
void PacketPeerStream::set_stream_peer(const Ref<StreamPeer> &p_peer) {
//ERR_FAIL_COND(p_peer.is_null());
if (p_peer.ptr() != peer.ptr()) {
ring_buffer.advance_read(ring_buffer.data_left()); // reset the ring buffer
};
peer=p_peer;
}
void PacketPeerStream::set_input_buffer_max_size(int p_max_size) {
//warning may lose packets
ERR_EXPLAIN("Buffer in use, resizing would cause loss of data");
ERR_FAIL_COND(ring_buffer.data_left());
ring_buffer.resize(nearest_shift(p_max_size+4));
temp_buffer.resize(nearest_power_of_2(p_max_size+4));
}
PacketPeerStream::PacketPeerStream() {
int rbsize=GLOBAL_DEF( "core/packet_stream_peer_max_buffer_po2",(16));
ring_buffer.resize(rbsize);
temp_buffer.resize(1<<rbsize);
}
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