tor-android/external/badvpn_dns/flow/PacketStreamSender.c

112 lines
3.4 KiB
C
Raw Normal View History

2015-01-25 11:08:34 +00:00
/**
* @file PacketStreamSender.c
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdlib.h>
#include <misc/debug.h>
#include <flow/PacketStreamSender.h>
static void send_data (PacketStreamSender *s)
{
ASSERT(s->in_len >= 0)
if (s->in_used < s->in_len) {
// send more data
StreamPassInterface_Sender_Send(s->output, s->in + s->in_used, s->in_len - s->in_used);
} else {
// finish input packet
s->in_len = -1;
PacketPassInterface_Done(&s->input);
}
}
static void input_handler_send (PacketStreamSender *s, uint8_t *data, int data_len)
{
ASSERT(s->in_len == -1)
ASSERT(data_len >= 0)
DebugObject_Access(&s->d_obj);
// set input packet
s->in_len = data_len;
s->in = data;
s->in_used = 0;
// send
send_data(s);
}
static void output_handler_done (PacketStreamSender *s, int data_len)
{
ASSERT(s->in_len >= 0)
ASSERT(data_len > 0)
ASSERT(data_len <= s->in_len - s->in_used)
DebugObject_Access(&s->d_obj);
// update number of bytes sent
s->in_used += data_len;
// send
send_data(s);
}
void PacketStreamSender_Init (PacketStreamSender *s, StreamPassInterface *output, int mtu, BPendingGroup *pg)
{
ASSERT(mtu >= 0)
// init arguments
s->output = output;
// init input
PacketPassInterface_Init(&s->input, mtu, (PacketPassInterface_handler_send)input_handler_send, s, pg);
// init output
StreamPassInterface_Sender_Init(s->output, (StreamPassInterface_handler_done)output_handler_done, s);
// have no input packet
s->in_len = -1;
DebugObject_Init(&s->d_obj);
}
void PacketStreamSender_Free (PacketStreamSender *s)
{
DebugObject_Free(&s->d_obj);
// free input
PacketPassInterface_Free(&s->input);
}
PacketPassInterface * PacketStreamSender_GetInput (PacketStreamSender *s)
{
DebugObject_Access(&s->d_obj);
return &s->input;
}