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1 | office | 1 | /** |
2 | * @file PacketProtoEncoder.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 | #include <string.h> |
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32 | |||
33 | #include <protocol/packetproto.h> |
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34 | #include <misc/balign.h> |
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35 | #include <misc/debug.h> |
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36 | #include <misc/byteorder.h> |
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37 | |||
38 | #include <flow/PacketProtoEncoder.h> |
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39 | |||
40 | static void output_handler_recv (PacketProtoEncoder *enc, uint8_t *data) |
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41 | { |
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42 | ASSERT(!enc->output_packet) |
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43 | ASSERT(data) |
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44 | DebugObject_Access(&enc->d_obj); |
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45 | |||
46 | // schedule receive |
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47 | enc->output_packet = data; |
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48 | PacketRecvInterface_Receiver_Recv(enc->input, enc->output_packet + sizeof(struct packetproto_header)); |
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49 | } |
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50 | |||
51 | static void input_handler_done (PacketProtoEncoder *enc, int in_len) |
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52 | { |
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53 | ASSERT(enc->output_packet) |
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54 | DebugObject_Access(&enc->d_obj); |
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55 | |||
56 | // write length |
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57 | struct packetproto_header pp; |
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58 | pp.len = htol16(in_len); |
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59 | memcpy(enc->output_packet, &pp, sizeof(pp)); |
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60 | |||
61 | // finish output packet |
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62 | enc->output_packet = NULL; |
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63 | PacketRecvInterface_Done(&enc->output, PACKETPROTO_ENCLEN(in_len)); |
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64 | } |
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65 | |||
66 | void PacketProtoEncoder_Init (PacketProtoEncoder *enc, PacketRecvInterface *input, BPendingGroup *pg) |
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67 | { |
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68 | ASSERT(PacketRecvInterface_GetMTU(input) <= PACKETPROTO_MAXPAYLOAD) |
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69 | |||
70 | // init arguments |
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71 | enc->input = input; |
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72 | |||
73 | // init input |
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74 | PacketRecvInterface_Receiver_Init(enc->input, (PacketRecvInterface_handler_done)input_handler_done, enc); |
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75 | |||
76 | // init output |
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77 | PacketRecvInterface_Init( |
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78 | &enc->output, PACKETPROTO_ENCLEN(PacketRecvInterface_GetMTU(enc->input)), |
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79 | (PacketRecvInterface_handler_recv)output_handler_recv, enc, pg |
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80 | ); |
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81 | |||
82 | // set no output packet |
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83 | enc->output_packet = NULL; |
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84 | |||
85 | DebugObject_Init(&enc->d_obj); |
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86 | } |
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87 | |||
88 | void PacketProtoEncoder_Free (PacketProtoEncoder *enc) |
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89 | { |
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90 | DebugObject_Free(&enc->d_obj); |
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91 | |||
92 | // free input |
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93 | PacketRecvInterface_Free(&enc->output); |
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94 | } |
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95 | |||
96 | PacketRecvInterface * PacketProtoEncoder_GetOutput (PacketProtoEncoder *enc) |
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97 | { |
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98 | DebugObject_Access(&enc->d_obj); |
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99 | |||
100 | return &enc->output; |
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101 | } |