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1 office 1 /**
2 * @file SinglePacketBuffer.c
3 * @author Ambroz Bizjak <ambrop7@gmail.com>
4 *
5 * @section LICENSE
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the author nor the
15 * names of its contributors may be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29  
30 #include <stdlib.h>
31  
32 #include <misc/debug.h>
33 #include <misc/balloc.h>
34  
35 #include <flow/SinglePacketBuffer.h>
36  
37 static void input_handler_done (SinglePacketBuffer *o, int in_len)
38 {
39 DebugObject_Access(&o->d_obj);
40  
41 PacketPassInterface_Sender_Send(o->output, o->buf, in_len);
42 }
43  
44 static void output_handler_done (SinglePacketBuffer *o)
45 {
46 DebugObject_Access(&o->d_obj);
47  
48 PacketRecvInterface_Receiver_Recv(o->input, o->buf);
49 }
50  
51 int SinglePacketBuffer_Init (SinglePacketBuffer *o, PacketRecvInterface *input, PacketPassInterface *output, BPendingGroup *pg)
52 {
53 ASSERT(PacketPassInterface_GetMTU(output) >= PacketRecvInterface_GetMTU(input))
54  
55 // init arguments
56 o->input = input;
57 o->output = output;
58  
59 // init input
60 PacketRecvInterface_Receiver_Init(o->input, (PacketRecvInterface_handler_done)input_handler_done, o);
61  
62 // init output
63 PacketPassInterface_Sender_Init(o->output, (PacketPassInterface_handler_done)output_handler_done, o);
64  
65 // init buffer
66 if (!(o->buf = (uint8_t *)BAlloc(PacketRecvInterface_GetMTU(o->input)))) {
67 goto fail1;
68 }
69  
70 // schedule receive
71 PacketRecvInterface_Receiver_Recv(o->input, o->buf);
72  
73 DebugObject_Init(&o->d_obj);
74  
75 return 1;
76  
77 fail1:
78 return 0;
79 }
80  
81 void SinglePacketBuffer_Free (SinglePacketBuffer *o)
82 {
83 DebugObject_Free(&o->d_obj);
84  
85 // free buffer
86 BFree(o->buf);
87 }