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

/**
 * @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;
}