1 | /*
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2 | t1_block.h
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3 | T=1 block abstract data type implementation
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4 |
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5 | This file is part of the Unix driver for Towitoko smartcard readers
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6 | Copyright (C) 2000 Carlos Prados <cprados@yahoo.com>
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7 |
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8 | This version is modified by doz21 to work in a special manner ;)
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9 |
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10 | This library is free software; you can redistribute it and/or
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11 | modify it under the terms of the GNU Lesser General Public
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12 | License as published by the Free Software Foundation; either
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13 | version 2 of the License, or (at your option) any later version.
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14 |
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15 | This library is distributed in the hope that it will be useful,
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16 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 | Lesser General Public License for more details.
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19 |
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20 | You should have received a copy of the GNU Lesser General Public
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21 | License along with this library; if not, write to the Free Software
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22 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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23 | */
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24 |
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25 | #include "t1_block.h"
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26 | #include <stdlib.h>
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27 | #include <string.h>
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28 |
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29 | /*
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30 | * Not exported constants definition
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31 | */
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32 |
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33 | #define T1_BLOCK_NAD 0x00
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34 |
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35 | /*
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36 | * Not exported functions declaration
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37 | */
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38 | static BYTE
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39 | T1_Block_LRC (BYTE * data, unsigned length);
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40 |
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41 | /*
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42 | * Exported functions definition
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43 | */
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44 |
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45 | T1_Block *
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46 | T1_Block_New (BYTE * buffer, unsigned length)
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47 | {
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48 | T1_Block * block;
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49 |
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50 | if (length < 4)
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51 | return NULL;
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52 |
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53 | block = (T1_Block *) malloc (sizeof (T1_Block));
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54 |
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55 | if (block != NULL)
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56 | {
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57 | block->length = MIN(length, T1_BLOCK_MAX_SIZE);
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58 | block->data = (BYTE *) calloc (block->length, sizeof (BYTE));
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59 |
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60 | if (block->data != NULL)
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61 | {
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62 | memcpy (block->data, buffer, block->length);
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63 | }
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64 | else
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65 | {
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66 | free (block);
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67 | block = NULL;
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68 | }
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69 | }
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70 |
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71 | return block;
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72 | }
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73 |
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74 | T1_Block *
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75 | T1_Block_NewIBlock (BYTE len, BYTE * inf, BYTE ns, bool more)
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76 | {
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77 | T1_Block * block;
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78 |
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79 | block = (T1_Block *) malloc (sizeof (T1_Block));
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80 |
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81 | if (block != NULL)
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82 | {
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83 | block->length = len + 4;
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84 | block->data = (BYTE *) calloc (block->length, sizeof (BYTE));
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85 |
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86 | if (block->data != NULL)
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87 | {
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88 | block->data[0] = T1_BLOCK_NAD;
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89 | block->data[1] = T1_BLOCK_I | ((ns << 6) & 0x40);
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90 |
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91 | if (more)
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92 | block->data[1] |= 0x20;
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93 |
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94 | block->data[2] = len;
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95 |
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96 | if (len != 0x00)
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97 | memcpy (block->data + 3, inf, len);
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98 |
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99 | block->data[len+3] = T1_Block_LRC (block->data, len+3);
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100 | }
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101 | else
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102 | {
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103 | free (block);
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104 | block = NULL;
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105 | }
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106 | }
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107 |
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108 | return block;
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109 | }
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110 |
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111 | T1_Block *
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112 | T1_Block_NewRBlock (BYTE type, BYTE nr)
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113 | {
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114 | T1_Block * block;
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115 |
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116 | block = (T1_Block *) malloc (sizeof (T1_Block));
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117 |
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118 | if (block != NULL)
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119 | {
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120 | block->length = 4;
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121 | block->data = (BYTE *) calloc (block->length, sizeof (BYTE));
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122 |
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123 | if (block->data != NULL)
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124 | {
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125 | block->data[0] = T1_BLOCK_NAD;
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126 | block->data[1] = type | ((nr << 4) & 0x10);
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127 | block->data[2] = 0x00;
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128 | block->data[3] = T1_Block_LRC (block->data, 3);
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129 | }
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130 | else
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131 | {
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132 | free (block);
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133 | block = NULL;
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134 | }
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135 | }
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136 |
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137 | return block;
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138 | }
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139 |
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140 | T1_Block *
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141 | T1_Block_NewSBlock (BYTE type, BYTE len, BYTE * inf)
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142 | {
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143 | T1_Block * block;
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144 |
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145 | block = (T1_Block *) malloc (sizeof (T1_Block));
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146 |
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147 | if (block != NULL)
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148 | {
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149 | block->length = 4 + len;
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150 | block->data = (BYTE *) calloc (block->length, sizeof (BYTE));
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151 |
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152 | if (block->data != NULL)
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153 | {
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154 | block->data[0] = T1_BLOCK_NAD;
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155 | block->data[1] = type;
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156 | block->data[2] = len;
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157 |
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158 | if (len != 0x00)
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159 | memcpy (block->data + 3, inf, len);
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160 |
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161 | block->data[len+3] = T1_Block_LRC (block->data, len+3);
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162 | }
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163 | else
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164 | {
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165 | free (block);
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166 | block = NULL;
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167 | }
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168 | }
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169 |
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170 | return block;
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171 | }
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172 |
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173 | BYTE
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174 | T1_Block_GetType (T1_Block * block)
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175 | {
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176 | if ((block->data[1] & 0x80) == T1_BLOCK_I)
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177 | return T1_BLOCK_I;
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178 |
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179 | return (block->data[1] & 0xEF);
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180 | }
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181 |
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182 | BYTE
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183 | T1_Block_GetNS (T1_Block * block)
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184 | {
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185 | return ((block->data[1] >> 6)& 0x01);
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186 | }
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187 |
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188 | bool
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189 | T1_Block_GetMore (T1_Block * block)
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190 | {
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191 | return ((block->data[1] >> 5) & 0x01);
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192 | }
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193 |
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194 | BYTE
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195 | T1_Block_GetNR (T1_Block * block)
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196 | {
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197 | return ((block->data[1] >> 4) & 0x01);
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198 | }
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199 |
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200 | BYTE
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201 | T1_Block_GetLen (T1_Block * block)
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202 | {
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203 | return block->data[2];
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204 | }
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205 |
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206 | BYTE *
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207 | T1_Block_GetInf (T1_Block * block)
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208 | {
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209 | if (block->length < 5)
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210 | return NULL;
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211 |
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212 | return block->data + 3;
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213 | }
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214 |
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215 | BYTE *
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216 | T1_Block_Raw (T1_Block * block)
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217 | {
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218 | return block->data;
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219 | }
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220 |
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221 | unsigned
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222 | T1_Block_RawLen (T1_Block * block)
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223 | {
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224 | return block->length;
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225 | }
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226 |
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227 | void
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228 | T1_Block_Delete (T1_Block * block)
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229 | {
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230 | free (block->data);
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231 | free (block);
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232 | }
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233 |
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234 | /*
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235 | * Not exported functions definition
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236 | */
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237 |
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238 | static BYTE
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239 | T1_Block_LRC (BYTE * data, unsigned length)
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240 | {
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241 | BYTE lrc;
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242 | unsigned i;
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243 |
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244 | lrc = 0x00;
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245 | for (i = 0; i < length; i++)
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246 | {
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247 | lrc ^= data[i];
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248 | }
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249 |
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250 | return lrc;
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251 | }
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