1 | /*
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2 | * Copyright (C) 2009-2013 by Matthias Ringwald
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3 | *
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4 | * Redistribution and use in source and binary forms, with or without
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5 | * modification, are permitted provided that the following conditions
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6 | * are met:
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7 | *
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the copyright holders nor the names of
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14 | * contributors may be used to endorse or promote products derived
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15 | * from this software without specific prior written permission.
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16 | * 4. Any redistribution, use, or modification is done solely for
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17 | * personal benefit and not for any commercial purpose or for
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18 | * monetary gain.
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19 | *
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20 | * THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD AND CONTRIBUTORS
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21 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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23 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
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24 | * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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25 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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26 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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27 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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28 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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29 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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30 | * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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31 | * SUCH DAMAGE.
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32 | *
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33 | * Please inquire about commercial licensing options at btstack@ringwald.ch
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34 | *
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35 | */
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36 |
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37 | /*
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38 | * sdp_parser.c
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39 | */
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40 | #include <btstack/hci_cmds.h>
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41 | #include "sdp_parser.h"
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42 | #include "debug.h"
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43 |
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44 | typedef enum {
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45 | GET_LIST_LENGTH = 1,
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46 | GET_RECORD_LENGTH,
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47 | GET_ATTRIBUTE_ID_HEADER_LENGTH,
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48 | GET_ATTRIBUTE_ID,
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49 | GET_ATTRIBUTE_VALUE_LENGTH,
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50 | GET_ATTRIBUTE_VALUE
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51 | } state_t;
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52 |
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53 | static state_t state = GET_LIST_LENGTH;
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54 | static uint16_t attribute_id = 0;
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55 | static uint16_t attribute_bytes_received = 0;
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56 | static uint16_t attribute_bytes_delivered = 0;
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57 | static uint16_t list_offset = 0;
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58 | static uint16_t list_size;
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59 | static uint16_t record_offset = 0;
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60 | static uint16_t record_size;
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61 | static uint16_t attribute_value_size;
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62 | static int record_counter = 0;
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63 |
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64 | #ifdef HAVE_SDP_EXTRA_QUERIES
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65 | static uint32_t record_handle;
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66 | #endif
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67 |
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68 | static void (*sdp_query_callback)(sdp_query_event_t * event);
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69 |
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70 | // Low level parser
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71 | static de_state_t de_header_state;
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72 |
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73 |
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74 | void de_state_init(de_state_t * state){
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75 | state->in_state_GET_DE_HEADER_LENGTH = 1;
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76 | state->addon_header_bytes = 0;
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77 | state->de_size = 0;
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78 | state->de_offset = 0;
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79 | }
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80 |
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81 | int de_state_size(uint8_t eventByte, de_state_t *de_state){
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82 | if (de_state->in_state_GET_DE_HEADER_LENGTH){
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83 | de_state->addon_header_bytes = de_get_header_size(&eventByte) - 1;
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84 | de_state->de_size = 0;
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85 | de_state->de_offset = 0;
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86 |
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87 | if (de_state->addon_header_bytes == 0){
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88 | de_state->de_size = de_get_data_size(&eventByte);
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89 | if (de_state->de_size == 0) {
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90 | log_error(" ERROR: ID size is zero");
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91 | }
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92 | // log_info("Data element payload is %d bytes.", de_state->de_size);
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93 | return 1;
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94 | }
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95 | de_state->in_state_GET_DE_HEADER_LENGTH = 0;
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96 | return 0;
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97 | }
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98 |
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99 | if (de_state->addon_header_bytes > 0){
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100 | de_state->de_size = (de_state->de_size << 8) | eventByte;
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101 | de_state->addon_header_bytes--;
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102 | }
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103 | if (de_state->addon_header_bytes > 0) return 0;
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104 | // log_info("Data element payload is %d bytes.", de_state->de_size);
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105 | de_state->in_state_GET_DE_HEADER_LENGTH = 1;
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106 | return 1;
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107 | }
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108 |
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109 | void dummy_notify(sdp_query_event_t* event){}
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110 |
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111 | void sdp_parser_register_callback(void (*sdp_callback)(sdp_query_event_t* event)){
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112 | sdp_query_callback = dummy_notify;
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113 | if (sdp_callback != NULL){
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114 | sdp_query_callback = sdp_callback;
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115 | }
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116 | }
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117 |
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118 | void parse(uint8_t eventByte){
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119 | // count all bytes
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120 | list_offset++;
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121 | record_offset++;
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122 |
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123 | // log_info(" parse BYTE_RECEIVED %02x", eventByte);
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124 | switch(state){
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125 | case GET_LIST_LENGTH:
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126 | if (!de_state_size(eventByte, &de_header_state)) break;
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127 | list_offset = de_header_state.de_offset;
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128 | list_size = de_header_state.de_size;
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129 | // log_info("parser: List offset %u, list size %u", list_offset, list_size);
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130 |
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131 | record_counter = 0;
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132 | state = GET_RECORD_LENGTH;
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133 | break;
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134 |
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135 | case GET_RECORD_LENGTH:
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136 | // check size
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137 | if (!de_state_size(eventByte, &de_header_state)) break;
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138 | // log_info("parser: Record payload is %d bytes.", de_header_state.de_size);
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139 | record_offset = de_header_state.de_offset;
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140 | record_size = de_header_state.de_size;
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141 | state = GET_ATTRIBUTE_ID_HEADER_LENGTH;
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142 | break;
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143 |
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144 | case GET_ATTRIBUTE_ID_HEADER_LENGTH:
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145 | if (!de_state_size(eventByte, &de_header_state)) break;
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146 | attribute_id = 0;
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147 | // log_info("ID data is stored in %d bytes.", de_header_state.de_size);
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148 | state = GET_ATTRIBUTE_ID;
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149 | break;
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150 |
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151 | case GET_ATTRIBUTE_ID:
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152 | attribute_id = (attribute_id << 8) | eventByte;
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153 | de_header_state.de_size--;
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154 | if (de_header_state.de_size > 0) break;
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155 | // log_info("parser: Attribute ID: %04x.", attribute_id);
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156 |
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157 | state = GET_ATTRIBUTE_VALUE_LENGTH;
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158 | attribute_bytes_received = 0;
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159 | attribute_bytes_delivered = 0;
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160 | attribute_value_size = 0;
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161 | de_state_init(&de_header_state);
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162 | break;
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163 |
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164 | case GET_ATTRIBUTE_VALUE_LENGTH:
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165 | attribute_bytes_received++;
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166 | {
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167 | sdp_query_attribute_value_event_t attribute_value_event = {
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168 | SDP_EVENT_QUERY_ATTRIBUTE_VALUE,
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169 | record_counter,
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170 | attribute_id,
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171 | attribute_value_size,
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172 | attribute_bytes_delivered++,
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173 | eventByte
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174 | };
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175 | (*sdp_query_callback)((sdp_query_event_t*)&attribute_value_event);
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176 | }
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177 | if (!de_state_size(eventByte, &de_header_state)) break;
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178 |
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179 | attribute_value_size = de_header_state.de_size + attribute_bytes_received;
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180 |
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181 | state = GET_ATTRIBUTE_VALUE;
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182 | break;
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183 |
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184 | case GET_ATTRIBUTE_VALUE:
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185 | attribute_bytes_received++;
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186 | {
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187 | sdp_query_attribute_value_event_t attribute_value_event = {
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188 | SDP_EVENT_QUERY_ATTRIBUTE_VALUE,
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189 | record_counter,
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190 | attribute_id,
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191 | attribute_value_size,
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192 | attribute_bytes_delivered++,
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193 | eventByte
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194 | };
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195 |
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196 | (*sdp_query_callback)((sdp_query_event_t*)&attribute_value_event);
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197 | }
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198 | // log_info("paser: attribute_bytes_received %u, attribute_value_size %u", attribute_bytes_received, attribute_value_size);
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199 |
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200 | if (attribute_bytes_received < attribute_value_size) break;
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201 | // log_info("parser: Record offset %u, record size %u", record_offset, record_size);
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202 | if (record_offset != record_size){
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203 | state = GET_ATTRIBUTE_ID_HEADER_LENGTH;
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204 | // log_info("Get next attribute");
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205 | break;
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206 | }
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207 | record_offset = 0;
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208 | // log_info("parser: List offset %u, list size %u", list_offset, list_size);
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209 |
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210 | if (list_size > 0 && list_offset != list_size){
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211 | record_counter++;
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212 | state = GET_RECORD_LENGTH;
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213 | // log_info("parser: END_OF_RECORD");
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214 | break;
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215 | }
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216 | list_offset = 0;
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217 | de_state_init(&de_header_state);
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218 | state = GET_LIST_LENGTH;
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219 | record_counter = 0;
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220 | // log_info("parser: END_OF_RECORD & DONE");
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221 | break;
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222 | default:
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223 | break;
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224 | }
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225 | }
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226 |
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227 | void sdp_parser_init(void){
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228 | // init
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229 | de_state_init(&de_header_state);
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230 | state = GET_LIST_LENGTH;
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231 | list_offset = 0;
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232 | record_offset = 0;
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233 | record_counter = 0;
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234 | }
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235 |
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236 | void sdp_parser_handle_chunk(uint8_t * data, uint16_t size){
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237 | int i;
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238 | for (i=0;i<size;i++){
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239 | parse(data[i]);
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240 | }
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241 | }
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242 |
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243 | #ifdef HAVE_SDP_EXTRA_QUERIES
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244 | void sdp_parser_init_service_attribute_search(void){
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245 | // init
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246 | de_state_init(&de_header_state);
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247 | state = GET_RECORD_LENGTH;
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248 | list_offset = 0;
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249 | record_offset = 0;
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250 | record_counter = 0;
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251 | }
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252 |
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253 | void sdp_parser_init_service_search(void){
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254 | record_offset = 0;
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255 | }
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256 |
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257 | void sdp_parser_handle_service_search(uint8_t * data, uint16_t total_count, uint16_t record_handle_count){
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258 | int i;
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259 | for (i=0;i<record_handle_count;i++){
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260 | record_handle = big_endian_read_32(data, i*4);
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261 | record_counter++;
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262 | {
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263 | sdp_query_service_record_handle_event_t service_record_handle_event = {
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264 | SDP_QUERY_SERVICE_RECORD_HANDLE,
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265 | total_count,
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266 | record_counter,
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267 | record_handle
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268 | };
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269 | (*sdp_query_callback)((sdp_query_event_t*)&service_record_handle_event);
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270 | }
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271 | }
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272 | }
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273 | #endif
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274 |
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275 | void sdp_parser_handle_done(uint8_t status){
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276 | sdp_query_complete_event_t complete_event = {
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277 | SDP_EVENT_QUERY_COMPLETE,
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278 | status
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279 | };
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280 | (*sdp_query_callback)((sdp_query_event_t*)&complete_event);
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281 | }
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