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1 office 1 /**
2 * @file BufferWriter.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 <misc/debug.h>
31  
32 #include <flow/BufferWriter.h>
33  
34 static void output_handler_recv (BufferWriter *o, uint8_t *data)
35 {
36 ASSERT(!o->out_have)
37  
38 // set output packet
39 o->out_have = 1;
40 o->out = data;
41 }
42  
43 void BufferWriter_Init (BufferWriter *o, int mtu, BPendingGroup *pg)
44 {
45 ASSERT(mtu >= 0)
46  
47 // init output
48 PacketRecvInterface_Init(&o->recv_interface, mtu, (PacketRecvInterface_handler_recv)output_handler_recv, o, pg);
49  
50 // set no output packet
51 o->out_have = 0;
52  
53 DebugObject_Init(&o->d_obj);
54 #ifndef NDEBUG
55 o->d_mtu = mtu;
56 o->d_writing = 0;
57 #endif
58 }
59  
60 void BufferWriter_Free (BufferWriter *o)
61 {
62 DebugObject_Free(&o->d_obj);
63  
64 // free output
65 PacketRecvInterface_Free(&o->recv_interface);
66 }
67  
68 PacketRecvInterface * BufferWriter_GetOutput (BufferWriter *o)
69 {
70 DebugObject_Access(&o->d_obj);
71  
72 return &o->recv_interface;
73 }
74  
75 int BufferWriter_StartPacket (BufferWriter *o, uint8_t **buf)
76 {
77 ASSERT(!o->d_writing)
78 DebugObject_Access(&o->d_obj);
79  
80 if (!o->out_have) {
81 return 0;
82 }
83  
84 if (buf) {
85 *buf = o->out;
86 }
87  
88 #ifndef NDEBUG
89 o->d_writing = 1;
90 #endif
91  
92 return 1;
93 }
94  
95 void BufferWriter_EndPacket (BufferWriter *o, int len)
96 {
97 ASSERT(len >= 0)
98 ASSERT(len <= o->d_mtu)
99 ASSERT(o->out_have)
100 ASSERT(o->d_writing)
101 DebugObject_Access(&o->d_obj);
102  
103 // set no output packet
104 o->out_have = 0;
105  
106 // finish packet
107 PacketRecvInterface_Done(&o->recv_interface, len);
108  
109 #ifndef NDEBUG
110 o->d_writing = 0;
111 #endif
112 }