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1 | office | 1 | /** |
2 | * @file PacketCopier.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 <string.h> |
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31 | |||
32 | #include <misc/debug.h> |
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33 | |||
34 | #include <flow/PacketCopier.h> |
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35 | |||
36 | static void input_handler_send (PacketCopier *o, uint8_t *data, int data_len) |
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37 | { |
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38 | ASSERT(o->in_len == -1) |
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39 | ASSERT(data_len >= 0) |
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40 | DebugObject_Access(&o->d_obj); |
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41 | |||
42 | if (!o->out_have) { |
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43 | o->in_len = data_len; |
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44 | o->in = data; |
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45 | return; |
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46 | } |
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47 | |||
48 | memcpy(o->out, data, data_len); |
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49 | |||
50 | // finish input packet |
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51 | PacketPassInterface_Done(&o->input); |
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52 | |||
53 | // finish output packet |
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54 | PacketRecvInterface_Done(&o->output, data_len); |
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55 | |||
56 | o->out_have = 0; |
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57 | } |
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58 | |||
59 | static void input_handler_requestcancel (PacketCopier *o) |
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60 | { |
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61 | ASSERT(o->in_len >= 0) |
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62 | ASSERT(!o->out_have) |
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63 | DebugObject_Access(&o->d_obj); |
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64 | |||
65 | // finish input packet |
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66 | PacketPassInterface_Done(&o->input); |
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67 | |||
68 | o->in_len = -1; |
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69 | } |
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70 | |||
71 | static void output_handler_recv (PacketCopier *o, uint8_t *data) |
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72 | { |
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73 | ASSERT(!o->out_have) |
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74 | DebugObject_Access(&o->d_obj); |
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75 | |||
76 | if (o->in_len < 0) { |
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77 | o->out_have = 1; |
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78 | o->out = data; |
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79 | return; |
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80 | } |
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81 | |||
82 | memcpy(data, o->in, o->in_len); |
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83 | |||
84 | // finish input packet |
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85 | PacketPassInterface_Done(&o->input); |
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86 | |||
87 | // finish output packet |
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88 | PacketRecvInterface_Done(&o->output, o->in_len); |
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89 | |||
90 | o->in_len = -1; |
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91 | } |
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92 | |||
93 | void PacketCopier_Init (PacketCopier *o, int mtu, BPendingGroup *pg) |
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94 | { |
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95 | ASSERT(mtu >= 0) |
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96 | |||
97 | // init input |
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98 | PacketPassInterface_Init(&o->input, mtu, (PacketPassInterface_handler_send)input_handler_send, o, pg); |
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99 | PacketPassInterface_EnableCancel(&o->input, (PacketPassInterface_handler_requestcancel)input_handler_requestcancel); |
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100 | |||
101 | // init output |
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102 | PacketRecvInterface_Init(&o->output, mtu, (PacketRecvInterface_handler_recv)output_handler_recv, o, pg); |
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103 | |||
104 | // set no input packet |
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105 | o->in_len = -1; |
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106 | |||
107 | // set no output packet |
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108 | o->out_have = 0; |
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109 | |||
110 | DebugObject_Init(&o->d_obj); |
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111 | } |
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112 | |||
113 | void PacketCopier_Free (PacketCopier *o) |
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114 | { |
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115 | DebugObject_Free(&o->d_obj); |
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116 | |||
117 | // free output |
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118 | PacketRecvInterface_Free(&o->output); |
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119 | |||
120 | // free input |
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121 | PacketPassInterface_Free(&o->input); |
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122 | } |
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123 | |||
124 | PacketPassInterface * PacketCopier_GetInput (PacketCopier *o) |
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125 | { |
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126 | DebugObject_Access(&o->d_obj); |
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127 | |||
128 | return &o->input; |
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129 | } |
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130 | |||
131 | PacketRecvInterface * PacketCopier_GetOutput (PacketCopier *o) |
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132 | { |
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133 | DebugObject_Access(&o->d_obj); |
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134 | |||
135 | return &o->output; |
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136 | } |