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/*
Copyright (C) 2009-2016 Red Hat, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <fcntl.h>
#include "common-graphics-channel.h"
#include "dcc.h"
#include "red-client.h"
uint8_t *CommonGraphicsChannelClient::alloc_recv_buf(uint16_t type, uint32_t size)
{
/* SPICE_MSGC_MIGRATE_DATA is the only client message whose size is dynamic */
if (type == SPICE_MSGC_MIGRATE_DATA) {
return static_cast<uint8_t *>(g_malloc(size));
}
if (size > sizeof(recv_buf)) {
spice_warning("unexpected message size %u (max is %zd)", size, sizeof(recv_buf));
return nullptr;
}
return recv_buf;
}
void CommonGraphicsChannelClient::release_recv_buf(uint16_t type, uint32_t size, uint8_t* msg)
{
if (type == SPICE_MSGC_MIGRATE_DATA) {
g_free(msg);
}
}
bool CommonGraphicsChannelClient::config_socket()
{
RedClient *client = get_client();
MainChannelClient *mcc = client->get_main();
RedStream *stream = get_stream();
gboolean is_low_bandwidth;
// TODO - this should be dynamic, not one time at channel creation
is_low_bandwidth = mcc->is_low_bandwidth();
if (!red_stream_set_auto_flush(stream, false)) {
/* FIXME: Using Nagle's Algorithm can lead to apparent delays, depending
* on the delayed ack timeout on the other side.
* Instead of using Nagle's, we need to implement message buffering on
* the application level.
* see: http://www.stuartcheshire.org/papers/NagleDelayedAck/
*/
red_stream_set_no_delay(stream, !is_low_bandwidth);
}
// TODO: move wide/narrow ack setting to red_channel.
ack_set_client_window(is_low_bandwidth ? WIDE_CLIENT_ACK_WINDOW : NARROW_CLIENT_ACK_WINDOW);
return true;
}
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