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1 | office | 1 | /** |
2 | * @file StreamRecvConnector.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 <stddef.h> |
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31 | |||
32 | #include <misc/debug.h> |
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33 | |||
34 | #include <flow/StreamRecvConnector.h> |
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35 | |||
36 | static void output_handler_recv (StreamRecvConnector *o, uint8_t *data, int data_avail) |
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37 | { |
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38 | ASSERT(data_avail > 0) |
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39 | ASSERT(o->out_avail == -1) |
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40 | DebugObject_Access(&o->d_obj); |
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41 | |||
42 | // remember output packet |
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43 | o->out_avail = data_avail; |
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44 | o->out = data; |
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45 | |||
46 | if (o->input) { |
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47 | // schedule receive |
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48 | StreamRecvInterface_Receiver_Recv(o->input, o->out, o->out_avail); |
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49 | } |
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50 | } |
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51 | |||
52 | static void input_handler_done (StreamRecvConnector *o, int data_len) |
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53 | { |
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54 | ASSERT(data_len > 0) |
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55 | ASSERT(data_len <= o->out_avail) |
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56 | ASSERT(o->out_avail > 0) |
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57 | ASSERT(o->input) |
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58 | DebugObject_Access(&o->d_obj); |
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59 | |||
60 | // have no output packet |
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61 | o->out_avail = -1; |
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62 | |||
63 | // allow output to receive more packets |
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64 | StreamRecvInterface_Done(&o->output, data_len); |
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65 | } |
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66 | |||
67 | void StreamRecvConnector_Init (StreamRecvConnector *o, BPendingGroup *pg) |
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68 | { |
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69 | // init output |
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70 | StreamRecvInterface_Init(&o->output, (StreamRecvInterface_handler_recv)output_handler_recv, o, pg); |
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71 | |||
72 | // have no output packet |
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73 | o->out_avail = -1; |
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74 | |||
75 | // have no input |
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76 | o->input = NULL; |
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77 | |||
78 | DebugObject_Init(&o->d_obj); |
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79 | } |
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80 | |||
81 | void StreamRecvConnector_Free (StreamRecvConnector *o) |
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82 | { |
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83 | DebugObject_Free(&o->d_obj); |
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84 | |||
85 | // free output |
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86 | StreamRecvInterface_Free(&o->output); |
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87 | } |
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88 | |||
89 | StreamRecvInterface * StreamRecvConnector_GetOutput (StreamRecvConnector *o) |
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90 | { |
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91 | DebugObject_Access(&o->d_obj); |
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92 | |||
93 | return &o->output; |
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94 | } |
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95 | |||
96 | void StreamRecvConnector_ConnectInput (StreamRecvConnector *o, StreamRecvInterface *input) |
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97 | { |
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98 | ASSERT(!o->input) |
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99 | DebugObject_Access(&o->d_obj); |
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100 | |||
101 | // set input |
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102 | o->input = input; |
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103 | |||
104 | // init input |
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105 | StreamRecvInterface_Receiver_Init(o->input, (StreamRecvInterface_handler_done)input_handler_done, o); |
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106 | |||
107 | // if we have an output packet, schedule receive |
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108 | if (o->out_avail > 0) { |
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109 | StreamRecvInterface_Receiver_Recv(o->input, o->out, o->out_avail); |
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110 | } |
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111 | } |
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112 | |||
113 | void StreamRecvConnector_DisconnectInput (StreamRecvConnector *o) |
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114 | { |
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115 | ASSERT(o->input) |
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116 | DebugObject_Access(&o->d_obj); |
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117 | |||
118 | // set no input |
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119 | o->input = NULL; |
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120 | } |