BadVPN – Blame information for rev 1
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1 | office | 1 | /** |
2 | * @file LineBuffer.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 <stdlib.h> |
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31 | #include <string.h> |
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32 | |||
33 | #include <base/BLog.h> |
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34 | |||
35 | #include <flow/LineBuffer.h> |
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36 | |||
37 | #include <generated/blog_channel_LineBuffer.h> |
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38 | |||
39 | static void input_handler_done (LineBuffer *o, int data_len) |
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40 | { |
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41 | DebugObject_Access(&o->d_obj); |
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42 | ASSERT(data_len > 0) |
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43 | ASSERT(data_len <= o->buf_size - o->buf_used) |
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44 | |||
45 | // update buffer |
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46 | o->buf_used += data_len; |
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47 | |||
48 | // look for newline |
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49 | int i; |
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50 | for (i = o->buf_used - data_len; i < o->buf_used; i++) { |
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51 | if (o->buf[i] == o->nl_char) { |
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52 | break; |
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53 | } |
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54 | } |
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55 | |||
56 | if (i < o->buf_used || o->buf_used == o->buf_size) { |
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57 | if (i == o->buf_used) { |
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58 | BLog(BLOG_WARNING, "line too long"); |
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59 | } |
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60 | |||
61 | // pass to output |
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62 | o->buf_consumed = (i < o->buf_used ? i + 1 : i); |
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63 | PacketPassInterface_Sender_Send(o->output, o->buf, o->buf_consumed); |
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64 | } else { |
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65 | // receive more data |
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66 | StreamRecvInterface_Receiver_Recv(o->input, o->buf + o->buf_used, o->buf_size - o->buf_used); |
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67 | } |
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68 | } |
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69 | |||
70 | static void output_handler_done (LineBuffer *o) |
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71 | { |
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72 | DebugObject_Access(&o->d_obj); |
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73 | ASSERT(o->buf_consumed > 0) |
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74 | ASSERT(o->buf_consumed <= o->buf_used) |
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75 | |||
76 | // update buffer |
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77 | memmove(o->buf, o->buf + o->buf_consumed, o->buf_used - o->buf_consumed); |
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78 | o->buf_used -= o->buf_consumed; |
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79 | |||
80 | // look for newline |
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81 | int i; |
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82 | for (i = 0; i < o->buf_used; i++) { |
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83 | if (o->buf[i] == o->nl_char) { |
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84 | break; |
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85 | } |
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86 | } |
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87 | |||
88 | if (i < o->buf_used || o->buf_used == o->buf_size) { |
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89 | // pass to output |
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90 | o->buf_consumed = (i < o->buf_used ? i + 1 : i); |
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91 | PacketPassInterface_Sender_Send(o->output, o->buf, o->buf_consumed); |
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92 | } else { |
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93 | // receive more data |
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94 | StreamRecvInterface_Receiver_Recv(o->input, o->buf + o->buf_used, o->buf_size - o->buf_used); |
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95 | } |
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96 | } |
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97 | |||
98 | int LineBuffer_Init (LineBuffer *o, StreamRecvInterface *input, PacketPassInterface *output, int buf_size, uint8_t nl_char) |
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99 | { |
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100 | ASSERT(buf_size > 0) |
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101 | ASSERT(PacketPassInterface_GetMTU(output) >= buf_size) |
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102 | |||
103 | // init arguments |
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104 | o->input = input; |
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105 | o->output = output; |
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106 | o->buf_size = buf_size; |
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107 | o->nl_char = nl_char; |
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108 | |||
109 | // init input |
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110 | StreamRecvInterface_Receiver_Init(o->input, (StreamRecvInterface_handler_done)input_handler_done, o); |
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111 | |||
112 | // init output |
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113 | PacketPassInterface_Sender_Init(o->output, (PacketPassInterface_handler_done)output_handler_done, o); |
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114 | |||
115 | // set buffer empty |
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116 | o->buf_used = 0; |
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117 | |||
118 | // allocate buffer |
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119 | if (!(o->buf = (uint8_t *)malloc(o->buf_size))) { |
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120 | BLog(BLOG_ERROR, "malloc failed"); |
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121 | goto fail0; |
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122 | } |
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123 | |||
124 | // start receiving |
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125 | StreamRecvInterface_Receiver_Recv(o->input, o->buf, o->buf_size); |
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126 | |||
127 | DebugObject_Init(&o->d_obj); |
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128 | return 1; |
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129 | |||
130 | fail0: |
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131 | return 0; |
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132 | } |
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133 | |||
134 | void LineBuffer_Free (LineBuffer *o) |
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135 | { |
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136 | DebugObject_Free(&o->d_obj); |
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137 | |||
138 | // free buffer |
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139 | free(o->buf); |
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140 | } |