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1 office 1 /**
2 * @file PacketStreamSender.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  
34 #include <flow/PacketStreamSender.h>
35  
36 static void send_data (PacketStreamSender *s)
37 {
38 ASSERT(s->in_len >= 0)
39  
40 if (s->in_used < s->in_len) {
41 // send more data
42 StreamPassInterface_Sender_Send(s->output, s->in + s->in_used, s->in_len - s->in_used);
43 } else {
44 // finish input packet
45 s->in_len = -1;
46 PacketPassInterface_Done(&s->input);
47 }
48 }
49  
50 static void input_handler_send (PacketStreamSender *s, uint8_t *data, int data_len)
51 {
52 ASSERT(s->in_len == -1)
53 ASSERT(data_len >= 0)
54 DebugObject_Access(&s->d_obj);
55  
56 // set input packet
57 s->in_len = data_len;
58 s->in = data;
59 s->in_used = 0;
60  
61 // send
62 send_data(s);
63 }
64  
65 static void output_handler_done (PacketStreamSender *s, int data_len)
66 {
67 ASSERT(s->in_len >= 0)
68 ASSERT(data_len > 0)
69 ASSERT(data_len <= s->in_len - s->in_used)
70 DebugObject_Access(&s->d_obj);
71  
72 // update number of bytes sent
73 s->in_used += data_len;
74  
75 // send
76 send_data(s);
77 }
78  
79 void PacketStreamSender_Init (PacketStreamSender *s, StreamPassInterface *output, int mtu, BPendingGroup *pg)
80 {
81 ASSERT(mtu >= 0)
82  
83 // init arguments
84 s->output = output;
85  
86 // init input
87 PacketPassInterface_Init(&s->input, mtu, (PacketPassInterface_handler_send)input_handler_send, s, pg);
88  
89 // init output
90 StreamPassInterface_Sender_Init(s->output, (StreamPassInterface_handler_done)output_handler_done, s);
91  
92 // have no input packet
93 s->in_len = -1;
94  
95 DebugObject_Init(&s->d_obj);
96 }
97  
98 void PacketStreamSender_Free (PacketStreamSender *s)
99 {
100 DebugObject_Free(&s->d_obj);
101  
102 // free input
103 PacketPassInterface_Free(&s->input);
104 }
105  
106 PacketPassInterface * PacketStreamSender_GetInput (PacketStreamSender *s)
107 {
108 DebugObject_Access(&s->d_obj);
109  
110 return &s->input;
111 }