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1 office 1 /**
2 * @file PacketPassConnector.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/PacketPassConnector.h>
35  
36 static void input_handler_send (PacketPassConnector *o, uint8_t *data, int data_len)
37 {
38 ASSERT(data_len >= 0)
39 ASSERT(data_len <= o->input_mtu)
40 ASSERT(o->in_len == -1)
41 DebugObject_Access(&o->d_obj);
42  
43 // remember input packet
44 o->in_len = data_len;
45 o->in = data;
46  
47 if (o->output) {
48 // schedule send
49 PacketPassInterface_Sender_Send(o->output, o->in, o->in_len);
50 }
51 }
52  
53 static void output_handler_done (PacketPassConnector *o)
54 {
55 ASSERT(o->in_len >= 0)
56 ASSERT(o->output)
57 DebugObject_Access(&o->d_obj);
58  
59 // have no input packet
60 o->in_len = -1;
61  
62 // allow input to send more packets
63 PacketPassInterface_Done(&o->input);
64 }
65  
66 void PacketPassConnector_Init (PacketPassConnector *o, int mtu, BPendingGroup *pg)
67 {
68 ASSERT(mtu >= 0)
69  
70 // init arguments
71 o->input_mtu = mtu;
72  
73 // init input
74 PacketPassInterface_Init(&o->input, o->input_mtu, (PacketPassInterface_handler_send)input_handler_send, o, pg);
75  
76 // have no input packet
77 o->in_len = -1;
78  
79 // have no output
80 o->output = NULL;
81  
82 DebugObject_Init(&o->d_obj);
83 }
84  
85 void PacketPassConnector_Free (PacketPassConnector *o)
86 {
87 DebugObject_Free(&o->d_obj);
88  
89 // free input
90 PacketPassInterface_Free(&o->input);
91 }
92  
93 PacketPassInterface * PacketPassConnector_GetInput (PacketPassConnector *o)
94 {
95 DebugObject_Access(&o->d_obj);
96  
97 return &o->input;
98 }
99  
100 void PacketPassConnector_ConnectOutput (PacketPassConnector *o, PacketPassInterface *output)
101 {
102 ASSERT(!o->output)
103 ASSERT(PacketPassInterface_GetMTU(output) >= o->input_mtu)
104 DebugObject_Access(&o->d_obj);
105  
106 // set output
107 o->output = output;
108  
109 // init output
110 PacketPassInterface_Sender_Init(o->output, (PacketPassInterface_handler_done)output_handler_done, o);
111  
112 // if we have an input packet, schedule send
113 if (o->in_len >= 0) {
114 PacketPassInterface_Sender_Send(o->output, o->in, o->in_len);
115 }
116 }
117  
118 void PacketPassConnector_DisconnectOutput (PacketPassConnector *o)
119 {
120 ASSERT(o->output)
121 DebugObject_Access(&o->d_obj);
122  
123 // set no output
124 o->output = NULL;
125 }