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1 office 1 /**
2 * @file PacketRecvConnector.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 <stddef.h>
31  
32 #include <misc/debug.h>
33  
34 #include <flow/PacketRecvConnector.h>
35  
36 static void output_handler_recv (PacketRecvConnector *o, uint8_t *data)
37 {
38 ASSERT(!o->out_have)
39 DebugObject_Access(&o->d_obj);
40  
41 // remember output packet
42 o->out_have = 1;
43 o->out = data;
44  
45 if (o->input) {
46 // schedule receive
47 PacketRecvInterface_Receiver_Recv(o->input, o->out);
48 }
49 }
50  
51 static void input_handler_done (PacketRecvConnector *o, int data_len)
52 {
53 ASSERT(o->out_have)
54 ASSERT(o->input)
55 DebugObject_Access(&o->d_obj);
56  
57 // have no output packet
58 o->out_have = 0;
59  
60 // allow output to receive more packets
61 PacketRecvInterface_Done(&o->output, data_len);
62 }
63  
64 void PacketRecvConnector_Init (PacketRecvConnector *o, int mtu, BPendingGroup *pg)
65 {
66 ASSERT(mtu >= 0)
67  
68 // init arguments
69 o->output_mtu = mtu;
70  
71 // init output
72 PacketRecvInterface_Init(&o->output, o->output_mtu, (PacketRecvInterface_handler_recv)output_handler_recv, o, pg);
73  
74 // have no output packet
75 o->out_have = 0;
76  
77 // have no input
78 o->input = NULL;
79  
80 DebugObject_Init(&o->d_obj);
81 }
82  
83 void PacketRecvConnector_Free (PacketRecvConnector *o)
84 {
85 DebugObject_Free(&o->d_obj);
86  
87 // free output
88 PacketRecvInterface_Free(&o->output);
89 }
90  
91 PacketRecvInterface * PacketRecvConnector_GetOutput (PacketRecvConnector *o)
92 {
93 DebugObject_Access(&o->d_obj);
94  
95 return &o->output;
96 }
97  
98 void PacketRecvConnector_ConnectInput (PacketRecvConnector *o, PacketRecvInterface *input)
99 {
100 ASSERT(!o->input)
101 ASSERT(PacketRecvInterface_GetMTU(input) <= o->output_mtu)
102 DebugObject_Access(&o->d_obj);
103  
104 // set input
105 o->input = input;
106  
107 // init input
108 PacketRecvInterface_Receiver_Init(o->input, (PacketRecvInterface_handler_done)input_handler_done, o);
109  
110 // if we have an output packet, schedule receive
111 if (o->out_have) {
112 PacketRecvInterface_Receiver_Recv(o->input, o->out);
113 }
114 }
115  
116 void PacketRecvConnector_DisconnectInput (PacketRecvConnector *o)
117 {
118 ASSERT(o->input)
119 DebugObject_Access(&o->d_obj);
120  
121 // set no input
122 o->input = NULL;
123 }