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1 office 1 /**
2 * @file StreamPassConnector.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/StreamPassConnector.h>
35  
36 static void input_handler_send (StreamPassConnector *o, uint8_t *data, int data_len)
37 {
38 ASSERT(data_len > 0)
39 ASSERT(o->in_len == -1)
40 DebugObject_Access(&o->d_obj);
41  
42 // remember input packet
43 o->in_len = data_len;
44 o->in = data;
45  
46 if (o->output) {
47 // schedule send
48 StreamPassInterface_Sender_Send(o->output, o->in, o->in_len);
49 }
50 }
51  
52 static void output_handler_done (StreamPassConnector *o, int data_len)
53 {
54 ASSERT(data_len > 0)
55 ASSERT(data_len <= o->in_len)
56 ASSERT(o->in_len > 0)
57 ASSERT(o->output)
58 DebugObject_Access(&o->d_obj);
59  
60 // have no input packet
61 o->in_len = -1;
62  
63 // allow input to send more packets
64 StreamPassInterface_Done(&o->input, data_len);
65 }
66  
67 void StreamPassConnector_Init (StreamPassConnector *o, BPendingGroup *pg)
68 {
69 // init output
70 StreamPassInterface_Init(&o->input, (StreamPassInterface_handler_send)input_handler_send, o, pg);
71  
72 // have no input packet
73 o->in_len = -1;
74  
75 // have no output
76 o->output = NULL;
77  
78 DebugObject_Init(&o->d_obj);
79 }
80  
81 void StreamPassConnector_Free (StreamPassConnector *o)
82 {
83 DebugObject_Free(&o->d_obj);
84  
85 // free output
86 StreamPassInterface_Free(&o->input);
87 }
88  
89 StreamPassInterface * StreamPassConnector_GetInput (StreamPassConnector *o)
90 {
91 DebugObject_Access(&o->d_obj);
92  
93 return &o->input;
94 }
95  
96 void StreamPassConnector_ConnectOutput (StreamPassConnector *o, StreamPassInterface *output)
97 {
98 ASSERT(!o->output)
99 DebugObject_Access(&o->d_obj);
100  
101 // set output
102 o->output = output;
103  
104 // init output
105 StreamPassInterface_Sender_Init(o->output, (StreamPassInterface_handler_done)output_handler_done, o);
106  
107 // if we have an input packet, schedule send
108 if (o->in_len > 0) {
109 StreamPassInterface_Sender_Send(o->output, o->in, o->in_len);
110 }
111 }
112  
113 void StreamPassConnector_DisconnectOutput (StreamPassConnector *o)
114 {
115 ASSERT(o->output)
116 DebugObject_Access(&o->d_obj);
117  
118 // set no output
119 o->output = NULL;
120 }