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1 office 1 /**
2 * @file StreamRecvConnector.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/StreamRecvConnector.h>
35  
36 static void output_handler_recv (StreamRecvConnector *o, uint8_t *data, int data_avail)
37 {
38 ASSERT(data_avail > 0)
39 ASSERT(o->out_avail == -1)
40 DebugObject_Access(&o->d_obj);
41  
42 // remember output packet
43 o->out_avail = data_avail;
44 o->out = data;
45  
46 if (o->input) {
47 // schedule receive
48 StreamRecvInterface_Receiver_Recv(o->input, o->out, o->out_avail);
49 }
50 }
51  
52 static void input_handler_done (StreamRecvConnector *o, int data_len)
53 {
54 ASSERT(data_len > 0)
55 ASSERT(data_len <= o->out_avail)
56 ASSERT(o->out_avail > 0)
57 ASSERT(o->input)
58 DebugObject_Access(&o->d_obj);
59  
60 // have no output packet
61 o->out_avail = -1;
62  
63 // allow output to receive more packets
64 StreamRecvInterface_Done(&o->output, data_len);
65 }
66  
67 void StreamRecvConnector_Init (StreamRecvConnector *o, BPendingGroup *pg)
68 {
69 // init output
70 StreamRecvInterface_Init(&o->output, (StreamRecvInterface_handler_recv)output_handler_recv, o, pg);
71  
72 // have no output packet
73 o->out_avail = -1;
74  
75 // have no input
76 o->input = NULL;
77  
78 DebugObject_Init(&o->d_obj);
79 }
80  
81 void StreamRecvConnector_Free (StreamRecvConnector *o)
82 {
83 DebugObject_Free(&o->d_obj);
84  
85 // free output
86 StreamRecvInterface_Free(&o->output);
87 }
88  
89 StreamRecvInterface * StreamRecvConnector_GetOutput (StreamRecvConnector *o)
90 {
91 DebugObject_Access(&o->d_obj);
92  
93 return &o->output;
94 }
95  
96 void StreamRecvConnector_ConnectInput (StreamRecvConnector *o, StreamRecvInterface *input)
97 {
98 ASSERT(!o->input)
99 DebugObject_Access(&o->d_obj);
100  
101 // set input
102 o->input = input;
103  
104 // init input
105 StreamRecvInterface_Receiver_Init(o->input, (StreamRecvInterface_handler_done)input_handler_done, o);
106  
107 // if we have an output packet, schedule receive
108 if (o->out_avail > 0) {
109 StreamRecvInterface_Receiver_Recv(o->input, o->out, o->out_avail);
110 }
111 }
112  
113 void StreamRecvConnector_DisconnectInput (StreamRecvConnector *o)
114 {
115 ASSERT(o->input)
116 DebugObject_Access(&o->d_obj);
117  
118 // set no input
119 o->input = NULL;
120 }