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1 | office | 1 | /** |
2 | * @file BufferWriter.c |
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3 | * @author Ambroz Bizjak <ambrop7@gmail.com> |
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4 | * |
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5 | * @section LICENSE |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * 3. Neither the name of the author nor the |
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15 | * names of its contributors may be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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21 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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22 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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24 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | */ |
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29 | |||
30 | #include <misc/debug.h> |
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31 | |||
32 | #include <flow/BufferWriter.h> |
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33 | |||
34 | static void output_handler_recv (BufferWriter *o, uint8_t *data) |
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35 | { |
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36 | ASSERT(!o->out_have) |
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37 | |||
38 | // set output packet |
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39 | o->out_have = 1; |
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40 | o->out = data; |
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41 | } |
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42 | |||
43 | void BufferWriter_Init (BufferWriter *o, int mtu, BPendingGroup *pg) |
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44 | { |
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45 | ASSERT(mtu >= 0) |
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46 | |||
47 | // init output |
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48 | PacketRecvInterface_Init(&o->recv_interface, mtu, (PacketRecvInterface_handler_recv)output_handler_recv, o, pg); |
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49 | |||
50 | // set no output packet |
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51 | o->out_have = 0; |
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52 | |||
53 | DebugObject_Init(&o->d_obj); |
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54 | #ifndef NDEBUG |
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55 | o->d_mtu = mtu; |
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56 | o->d_writing = 0; |
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57 | #endif |
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58 | } |
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59 | |||
60 | void BufferWriter_Free (BufferWriter *o) |
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61 | { |
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62 | DebugObject_Free(&o->d_obj); |
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63 | |||
64 | // free output |
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65 | PacketRecvInterface_Free(&o->recv_interface); |
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66 | } |
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67 | |||
68 | PacketRecvInterface * BufferWriter_GetOutput (BufferWriter *o) |
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69 | { |
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70 | DebugObject_Access(&o->d_obj); |
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71 | |||
72 | return &o->recv_interface; |
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73 | } |
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74 | |||
75 | int BufferWriter_StartPacket (BufferWriter *o, uint8_t **buf) |
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76 | { |
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77 | ASSERT(!o->d_writing) |
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78 | DebugObject_Access(&o->d_obj); |
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79 | |||
80 | if (!o->out_have) { |
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81 | return 0; |
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82 | } |
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83 | |||
84 | if (buf) { |
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85 | *buf = o->out; |
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86 | } |
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87 | |||
88 | #ifndef NDEBUG |
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89 | o->d_writing = 1; |
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90 | #endif |
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91 | |||
92 | return 1; |
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93 | } |
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94 | |||
95 | void BufferWriter_EndPacket (BufferWriter *o, int len) |
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96 | { |
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97 | ASSERT(len >= 0) |
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98 | ASSERT(len <= o->d_mtu) |
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99 | ASSERT(o->out_have) |
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100 | ASSERT(o->d_writing) |
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101 | DebugObject_Access(&o->d_obj); |
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102 | |||
103 | // set no output packet |
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104 | o->out_have = 0; |
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105 | |||
106 | // finish packet |
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107 | PacketRecvInterface_Done(&o->recv_interface, len); |
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108 | |||
109 | #ifndef NDEBUG |
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110 | o->d_writing = 0; |
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111 | #endif |
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112 | } |