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1 | office | 1 | /** |
2 | * @file SimpleStreamBuffer.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 | #include <stddef.h> |
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32 | |||
33 | #include <misc/balloc.h> |
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34 | #include <misc/minmax.h> |
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35 | |||
36 | #include "SimpleStreamBuffer.h" |
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37 | |||
38 | static void try_output (SimpleStreamBuffer *o) |
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39 | { |
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40 | ASSERT(o->output_data_len > 0) |
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41 | |||
42 | // calculate number of bytes to output |
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43 | int bytes = bmin_int(o->output_data_len, o->buf_used); |
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44 | if (bytes == 0) { |
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45 | return; |
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46 | } |
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47 | |||
48 | // copy bytes to output |
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49 | memcpy(o->output_data, o->buf, bytes); |
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50 | |||
51 | // shift buffer |
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52 | memmove(o->buf, o->buf + bytes, o->buf_used - bytes); |
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53 | o->buf_used -= bytes; |
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54 | |||
55 | // forget data |
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56 | o->output_data_len = -1; |
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57 | |||
58 | // done |
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59 | StreamRecvInterface_Done(&o->output, bytes); |
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60 | } |
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61 | |||
62 | static void output_handler_recv (SimpleStreamBuffer *o, uint8_t *data, int data_len) |
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63 | { |
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64 | DebugObject_Access(&o->d_obj); |
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65 | ASSERT(o->output_data_len == -1) |
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66 | ASSERT(data) |
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67 | ASSERT(data_len > 0) |
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68 | |||
69 | // remember data |
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70 | o->output_data = data; |
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71 | o->output_data_len = data_len; |
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72 | |||
73 | try_output(o); |
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74 | } |
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75 | |||
76 | int SimpleStreamBuffer_Init (SimpleStreamBuffer *o, int buf_size, BPendingGroup *pg) |
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77 | { |
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78 | ASSERT(buf_size > 0) |
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79 | |||
80 | // init arguments |
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81 | o->buf_size = buf_size; |
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82 | |||
83 | // init output |
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84 | StreamRecvInterface_Init(&o->output, (StreamRecvInterface_handler_recv)output_handler_recv, o, pg); |
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85 | |||
86 | // allocate buffer |
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87 | if (!(o->buf = (uint8_t *)BAlloc(buf_size))) { |
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88 | goto fail1; |
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89 | } |
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90 | |||
91 | // init buffer state |
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92 | o->buf_used = 0; |
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93 | |||
94 | // set no output data |
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95 | o->output_data_len = -1; |
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96 | |||
97 | DebugObject_Init(&o->d_obj); |
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98 | return 1; |
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99 | |||
100 | fail1: |
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101 | StreamRecvInterface_Free(&o->output); |
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102 | return 0; |
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103 | } |
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104 | |||
105 | void SimpleStreamBuffer_Free (SimpleStreamBuffer *o) |
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106 | { |
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107 | DebugObject_Free(&o->d_obj); |
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108 | |||
109 | // free buffer |
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110 | BFree(o->buf); |
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111 | |||
112 | // free output |
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113 | StreamRecvInterface_Free(&o->output); |
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114 | } |
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115 | |||
116 | StreamRecvInterface * SimpleStreamBuffer_GetOutput (SimpleStreamBuffer *o) |
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117 | { |
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118 | DebugObject_Access(&o->d_obj); |
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119 | |||
120 | return &o->output; |
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121 | } |
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122 | |||
123 | int SimpleStreamBuffer_Write (SimpleStreamBuffer *o, uint8_t *data, int data_len) |
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124 | { |
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125 | DebugObject_Access(&o->d_obj); |
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126 | ASSERT(data_len >= 0) |
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127 | |||
128 | if (data_len > o->buf_size - o->buf_used) { |
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129 | return 0; |
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130 | } |
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131 | |||
132 | // copy to buffer |
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133 | memcpy(o->buf + o->buf_used, data, data_len); |
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134 | |||
135 | // update buffer state |
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136 | o->buf_used += data_len; |
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137 | |||
138 | // continue outputting |
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139 | if (o->output_data_len > 0) { |
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140 | try_output(o); |
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141 | } |
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142 | |||
143 | return 1; |
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144 | } |