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