1 | /* |
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2 | orxonox - the future of 3D-vertical-scrollers |
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3 | |
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4 | Copyright (C) 2004 orx |
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5 | |
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6 | This program is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 2, or (at your option) |
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9 | any later version. |
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10 | |
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11 | ### File Specific: |
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12 | main-programmer: Benjamin Wuest (bwuest@ee.ethz.ch) |
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13 | co-programmer: Christoph Renner (rennerc@ee.ethz.ch) |
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14 | */ |
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15 | |
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16 | |
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17 | /* this is for debug output. It just says, that all calls to PRINT() belong to the DEBUG_MODULE_NETWORK module |
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18 | For more information refere to https://www.orxonox.net/cgi-bin/trac.cgi/wiki/DebugOutput |
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19 | */ |
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20 | #define DEBUG_MODULE_NETWORK |
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21 | |
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22 | /* include your own header */ |
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23 | #include "converter.h" |
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24 | #include "shell_command.h" |
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25 | #include "debug.h" |
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26 | #include <limits> |
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27 | |
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28 | SHELL_COMMAND_STATIC(debug, Converter, Converter::debug); |
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29 | |
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30 | |
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31 | /* using namespace std is default, this needs to be here */ |
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32 | |
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33 | |
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34 | /*! |
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35 | * Standard constructor |
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36 | */ |
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37 | Converter::Converter() |
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38 | { |
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39 | /* set the class id for the base object */ |
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40 | } |
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41 | |
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42 | /*! |
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43 | * Standard destructor |
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44 | */ |
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45 | Converter::~Converter() |
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46 | { |
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47 | } |
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48 | |
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49 | const int sgnadd = 128; // = 2^7 |
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50 | |
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51 | /*! |
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52 | * Converts an int into a byte-array |
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53 | * @remarks: The int is stored in big-endian |
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54 | * @param x: The int which is to convert |
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55 | * @return: A byte-array that accords the given int value |
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56 | */ |
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57 | byte* Converter::intToByteArray(int x) |
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58 | { |
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59 | const int mod = 256; // = 2^8 |
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60 | |
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61 | |
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62 | byte* result = new byte[INTSIZE]; |
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63 | int sgn; |
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64 | if (x >= 0) |
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65 | sgn = 1; |
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66 | else |
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67 | { |
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68 | sgn = -1; |
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69 | x = -x; |
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70 | } |
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71 | |
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72 | for (int i = 0; i < INTSIZE; i++) |
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73 | { |
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74 | result[i] = x % mod; |
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75 | x /= mod; |
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76 | } |
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77 | |
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78 | if (sgn == -1) |
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79 | result[INTSIZE - 1] += sgnadd; |
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80 | |
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81 | |
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82 | return result; |
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83 | } |
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84 | |
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85 | /*! |
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86 | * Converts an int into a byte-array and stores the result into a given byte-array |
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87 | * @remarks: The int is stored in big-endian |
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88 | * @param x: The int which is to convert |
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89 | * @return: The number of written bytes |
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90 | */ |
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91 | int Converter::_intToByteArray(int x, byte* a, int length) |
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92 | { |
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93 | if (length < INTSIZE) |
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94 | { |
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95 | PRINTF(1)("byte buffer to short to store an int. Needed length %i. Avaiable length %i", INTSIZE, length); |
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96 | return -1; |
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97 | } |
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98 | |
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99 | const int mod = 256; // = 2^8 |
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100 | |
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101 | int sgn; |
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102 | if (x >= 0) |
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103 | sgn = 1; |
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104 | else |
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105 | { |
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106 | sgn = -1; |
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107 | x = -x; |
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108 | } |
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109 | |
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110 | for (int i = 0; i < INTSIZE; i++) |
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111 | { |
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112 | a[i] = x % mod; |
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113 | x /= mod; |
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114 | } |
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115 | |
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116 | if (sgn == -1) |
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117 | a[INTSIZE - 1] += sgnadd; |
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118 | |
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119 | return INTSIZE; |
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120 | } |
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121 | |
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122 | /*! |
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123 | * Converts a byte-array into an int |
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124 | * @param a: The byte-array which is to convert |
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125 | * @param x: The place where the result is stored |
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126 | * @return: The number of read bytes |
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127 | */ |
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128 | int Converter::_byteArrayToInt(const byte* a, int* x) |
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129 | { |
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130 | int mult = 1; |
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131 | const int step = 256; // = 2 ^ 8 |
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132 | *x = 0; |
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133 | for (int i = 0; i < INTSIZE - 1; i++) |
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134 | { |
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135 | *x += a[i] * mult; |
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136 | mult *= step; |
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137 | } |
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138 | |
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139 | if (a[INTSIZE - 1] >= sgnadd) |
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140 | { |
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141 | *x += (a[INTSIZE - 1] - sgnadd) * mult; |
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142 | *x *= -1; |
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143 | } |
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144 | else |
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145 | *x += a[INTSIZE - 1] * mult; |
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146 | |
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147 | return INTSIZE; |
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148 | } |
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149 | |
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150 | int Converter::byteArrayToInt(const byte* a, int* x) |
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151 | { |
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152 | memcpy( x, a, INTSIZE ); |
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153 | return INTSIZE; |
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154 | } |
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155 | |
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156 | int Converter::intToByteArray(int x, byte* a, int length) |
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157 | { |
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158 | if ( length< INTSIZE ) |
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159 | { |
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160 | PRINTF(1)("Byte Array to small : %d\n", length); |
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161 | return 0; |
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162 | } |
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163 | memcpy(a, &x, INTSIZE); |
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164 | return INTSIZE; |
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165 | } |
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166 | |
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167 | /*! |
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168 | * Converts a float into a string containing its binary representation |
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169 | * @param x: The float which is to convert |
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170 | * @return: A string containing the float's binary representation |
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171 | */ |
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172 | char* Converter::floatToBinString(float x) |
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173 | { |
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174 | char* result = new char[200]; |
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175 | int pos = 0; |
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176 | |
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177 | if (x < 0) |
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178 | { |
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179 | result[pos++] = '-'; |
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180 | x = -x; |
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181 | } |
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182 | |
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183 | float sub = 1; |
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184 | while (sub < x) |
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185 | sub *= 2; |
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186 | |
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187 | while ((x > 0 || sub >= 1) && pos < 200) |
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188 | { |
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189 | if (x >= sub) |
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190 | { |
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191 | result[pos] = '1'; |
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192 | x -= sub; |
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193 | } |
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194 | else |
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195 | result[pos] = '0'; |
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196 | pos++; |
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197 | sub /= 2; |
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198 | |
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199 | if (sub == 0.5f) |
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200 | result[pos++] = '.'; |
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201 | } |
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202 | |
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203 | return result; |
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204 | } |
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205 | |
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206 | const int expmult = 8388608; //2^23 |
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207 | |
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208 | float Converter::getDenormConst() |
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209 | { |
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210 | const int exp = 126; |
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211 | float result = 1.0f; |
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212 | for (int i = 0; i < exp; i++) |
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213 | result /= 2.0f; |
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214 | return result; |
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215 | } |
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216 | |
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217 | /*! |
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218 | * Converts a float value into a byte-array and stores the result into a given byte-array |
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219 | * @param x: The float which is to convert |
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220 | * @param a: The byte array where the result is to store |
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221 | * @param length: The length of the array a |
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222 | * @return: The number of written bytes |
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223 | */ |
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224 | int Converter::_floatToByteArray(float x, byte* a, int length) |
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225 | { |
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226 | if (length < FLOATSIZE) |
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227 | { |
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228 | PRINTF(1)("byte buffer to short to store a float. Needed length %i. Avaiable length %i", FLOATSIZE, length); |
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229 | return -1; |
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230 | } |
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231 | |
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232 | //handle 0 else function will loop for ever |
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233 | /*if ( x == 0 ) |
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234 | { |
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235 | for ( int i = 0; i<FLOATSIZE; i++) |
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236 | a[i] = 0; |
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237 | return FLOATSIZE; |
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238 | }*/ |
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239 | |
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240 | int mantisse = 0; |
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241 | int exponent = 128; |
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242 | |
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243 | int sgn; |
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244 | if (x < 0) |
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245 | { |
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246 | x = -x; |
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247 | sgn = -1; |
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248 | } |
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249 | else |
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250 | sgn = 1; |
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251 | |
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252 | if (x == 0) |
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253 | { |
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254 | exponent = 255; |
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255 | mantisse = 0; |
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256 | } |
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257 | else |
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258 | { |
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259 | //if (x < getDenormConst()) |
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260 | // printf("Denormalisiert!\n"); |
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261 | //printf("DenormConst = %e", getDenormConst()); |
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262 | |
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263 | float sub = 1; |
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264 | while (sub < x) |
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265 | { |
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266 | sub *= 2; |
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267 | exponent++; |
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268 | } |
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269 | |
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270 | while (x > 0) |
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271 | { |
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272 | if (x >= sub) |
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273 | { |
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274 | mantisse += 1; |
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275 | x -= sub; |
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276 | } |
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277 | |
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278 | mantisse *= 2; |
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279 | exponent--; |
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280 | sub /= 2; |
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281 | } |
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282 | exponent++; |
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283 | mantisse /= 2; |
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284 | |
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285 | |
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286 | /// printf("Conv: mantisse = %i exponent = %i \n", mantisse, exponent); |
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287 | |
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288 | |
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289 | //if (mantisse != 0) |
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290 | //{ |
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291 | while (mantisse < expmult) |
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292 | { |
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293 | mantisse *= 2; |
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294 | exponent--; |
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295 | } |
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296 | |
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297 | if (exponent >= 0) |
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298 | mantisse -= expmult; |
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299 | else |
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300 | { |
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301 | //Denormalized |
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302 | while (exponent < 0) |
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303 | { |
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304 | mantisse /= 2; |
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305 | exponent++; |
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306 | } |
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307 | printf("Conv: Denorm"); |
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308 | } |
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309 | //} |
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310 | } |
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311 | |
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312 | /// printf("Conv: mantisse = %i exponent = %i \n", mantisse, exponent); |
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313 | |
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314 | |
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315 | int hx = mantisse + expmult * exponent; |
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316 | //int result = intToByteArray(hx, a, length); |
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317 | intToByteArray(hx, a, length); |
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318 | if (sgn == -1) |
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319 | a[3] += sgnadd; |
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320 | |
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321 | |
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322 | // int hx = mantisse + expmult * exponent; |
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323 | // byte* result = intToByteArray(hx); |
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324 | // if (sgn == -1) |
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325 | // result[3] += sgnadd; |
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326 | |
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327 | //return result; |
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328 | return FLOATSIZE; |
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329 | } |
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330 | |
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331 | |
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332 | /*! |
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333 | * Converts a byte-array into a float value |
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334 | * @param a: The byte-array which is to convert |
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335 | * @param x: The place where the result is to store |
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336 | * @return: The number of read bytes |
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337 | */ |
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338 | int Converter::_byteArrayToFloat(const byte* a, float* x) |
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339 | { |
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340 | //handle 0 |
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341 | /*for (int i = 0; i<FLOATSIZE; i++) |
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342 | { |
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343 | if (a[i]!=0) |
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344 | break; |
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345 | if ( i==FLOATSIZE-1 ) |
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346 | { |
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347 | *x = 0.0f; |
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348 | return FLOATSIZE; |
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349 | } |
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350 | }*/ |
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351 | |
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352 | int hexp = a[2] + a[3] * 256; |
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353 | int exponent = (hexp / 128) % 256; |
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354 | |
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355 | int hmant = a[0] + a[1] * 256 + a[2] * 65536; |
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356 | int mantisse = hmant % expmult; |
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357 | |
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358 | //handle 0 |
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359 | if (mantisse == 0 && exponent == 255) |
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360 | { |
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361 | *x = 0; |
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362 | return FLOATSIZE; |
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363 | } |
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364 | else if (exponent == 0 && mantisse != 0) |
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365 | { |
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366 | exponent = -126; |
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367 | printf("ReConv: Denorm"); |
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368 | } |
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369 | else |
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370 | { |
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371 | mantisse += expmult; |
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372 | exponent -= 128; |
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373 | } |
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374 | |
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375 | int sgn; |
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376 | if (a[3] >= sgnadd) |
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377 | sgn = -1; |
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378 | else |
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379 | sgn = 1; |
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380 | |
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381 | /// printf("ReConv: mantisse = %i exponent = %i \n", mantisse, exponent); |
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382 | |
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383 | float emult = 1; |
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384 | if (exponent > 0) |
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385 | for (int i = 0; i < exponent; i++) |
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386 | emult *= 2; |
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387 | else if (exponent < 0) |
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388 | for (int i = 0; i > exponent; i--) |
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389 | emult /= 2; |
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390 | |
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391 | /* |
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392 | float result = mantisse * emult; |
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393 | if (sgn == -1) |
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394 | result = -result; |
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395 | |
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396 | return result; |
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397 | */ |
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398 | |
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399 | *x = mantisse * emult; |
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400 | if (sgn == -1) |
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401 | *x = - *x; |
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402 | |
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403 | return FLOATSIZE; |
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404 | } |
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405 | |
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406 | /*! |
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407 | * Converts a float value into a byte-array |
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408 | * @param x: The float which is to convert |
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409 | * @param a: The array where the result is to store |
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410 | * @param length: The length of the array a |
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411 | * @return: The number of written bytes |
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412 | */ |
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413 | int Converter::floatToByteArray(float x, byte* a, int length) |
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414 | { |
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415 | if ( length< FLOATSIZE ) |
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416 | { |
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417 | PRINTF(1)("Byte Array to small\n"); |
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418 | return 0; |
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419 | } |
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420 | byte* p = (byte*)&x; |
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421 | |
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422 | for (int i = 0; i < 4; i++) |
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423 | a[i] = p[i]; |
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424 | |
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425 | return FLOATSIZE; |
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426 | } |
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427 | |
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428 | |
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429 | /*! |
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430 | * Converts a byte-array into a float value |
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431 | * @param a: The byte-array which is to convert |
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432 | * @param x: The place where the result is to store |
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433 | * @return: The number of read bytes |
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434 | */ |
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435 | int Converter::byteArrayToFloat(const byte* a, float* x) |
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436 | { |
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437 | *x = *((float*)a); |
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438 | |
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439 | return FLOATSIZE; |
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440 | } |
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441 | |
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442 | |
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443 | |
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444 | |
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445 | |
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446 | |
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447 | |
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448 | |
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449 | |
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450 | |
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451 | /** |
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452 | * copies a strint to a byte array |
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453 | * @param s: string to copy |
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454 | * @param a: byte array |
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455 | * @param length: string length |
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456 | * @return: the used number of bytes in byte array |
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457 | */ |
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458 | int Converter::stringToByteArray( const std::string & s, byte * a, int maxLength ) |
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459 | { |
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460 | if ( s.length()+INTSIZE > maxLength ) |
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461 | { |
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462 | PRINTF(1)("Byte array is too small (%d) to store %d bytes\n", maxLength, s.length()+INTSIZE); |
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463 | return -1; |
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464 | } |
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465 | |
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466 | int n = Converter::intToByteArray( s.length(), a, maxLength ); |
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467 | |
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468 | memcpy( a+INTSIZE, s.c_str(), s.length() ); |
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469 | |
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470 | return s.length() + INTSIZE; |
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471 | } |
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472 | |
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473 | /** |
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474 | * reads a string out of a byte array |
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475 | * @param a: byte array |
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476 | * @param s: string |
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477 | * @param maxLength: max bytes to copy |
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478 | * @return: the number of read bytes in byte array |
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479 | */ |
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480 | int Converter::byteArrayToString( const byte * a, std::string&s, int maxLength ) |
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481 | { |
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482 | int length; |
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483 | |
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484 | int n = Converter::byteArrayToInt( a, &length ); |
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485 | |
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486 | |
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487 | if ( length+1 > maxLength ) |
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488 | { |
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489 | PRINTF(1)("something went wrong length > remaining bytes in buffer\n" ); |
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490 | |
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491 | //TODO remove this |
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492 | for ( int i = -1000; i < 1001; i++ ) |
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493 | { |
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494 | if ( ( a[i] > 'a' && a[i] < 'z' ) || ( a[i] > 'A' && a[i] < 'Z' ) ) |
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495 | printf("%c", a[i]); |
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496 | else |
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497 | printf("."); |
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498 | } |
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499 | printf("\n"); |
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500 | |
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501 | s = ""; |
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502 | return -1; |
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503 | } |
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504 | |
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505 | s = ""; |
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506 | s.append( (char*)a+n, length ); |
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507 | |
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508 | return n+length; |
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509 | } |
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510 | |
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511 | #if 0 |
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512 | /** |
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513 | * reads a string out of a byte array and allocates memory for string |
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514 | * @param a: byte array |
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515 | * @param s: string |
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516 | * @param maxLength: max bytes to copy |
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517 | * @return: the number of read bytes in byte array |
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518 | */ |
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519 | int Converter::byteArrayToStringM( const byte * a, char*& s ) |
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520 | { |
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521 | int length; |
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522 | |
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523 | int n = Converter::byteArrayToInt( a, &length ); |
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524 | |
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525 | s = new char[length+1]; |
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526 | |
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527 | if ( !s ) |
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528 | { |
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529 | PRINTF(1)("Could not allocate memory!\n" ); |
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530 | return -1; |
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531 | } |
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532 | |
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533 | memcpy( s, a+n, length ); |
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534 | s[length] = '\0'; |
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535 | |
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536 | return n+length; |
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537 | } |
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538 | #endif |
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539 | |
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540 | |
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541 | |
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542 | void Converter::floatTest(float x) |
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543 | { |
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544 | //float x = 8.0f; |
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545 | //float x = numeric_limits<float>::infinity(); |
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546 | |
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547 | printf("To Convert: %e\n", x); |
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548 | |
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549 | // byte* res = floatToByteArray(x); |
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550 | // for (int i = 0; i < 4; i++) |
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551 | // printf("%i ", res[i]); |
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552 | // printf("\n"); |
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553 | |
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554 | // float y = byteArrayToFloat(res); |
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555 | // printf("ReConvert: %e\n", y); |
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556 | |
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557 | // if (x == y) |
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558 | // printf("equal\n"); |
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559 | // else |
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560 | // printf("different\n"); |
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561 | } |
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562 | |
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563 | void Converter::ArrayfloatTest(float x) |
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564 | { |
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565 | //float x = 8.0f; |
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566 | //float x = numeric_limits<float>::infinity(); |
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567 | |
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568 | printf("To Convert: %e\n", x); |
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569 | byte* res = new byte[4]; |
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570 | |
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571 | int wr = floatToByteArray(x, res, 4); |
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572 | for (int i = 0; i < 4; i++) |
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573 | printf("%i ", res[i]); |
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574 | printf(" written bytes: %i \n", wr); |
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575 | |
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576 | float y; |
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577 | int rd = byteArrayToFloat(res, &y); |
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578 | printf("ReConvert: %e\n", y); |
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579 | printf("Read bytes: %i -> ", rd); |
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580 | |
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581 | if (x == y) |
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582 | printf("equal\n"); |
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583 | else |
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584 | printf("different\n"); |
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585 | } |
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586 | |
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587 | void Converter::debug() |
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588 | { |
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589 | printf("We rulez\n"); |
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590 | |
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591 | ArrayfloatTest(0.125f); |
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592 | ArrayfloatTest(64.0f); |
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593 | ArrayfloatTest(0.0f); |
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594 | ArrayfloatTest(5.00091e-29f); |
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595 | |
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596 | //floatTest(-18.0098f); |
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597 | //floatTest(-24.07e23f); |
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598 | //floatTest(-0.0f); |
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599 | //floatTest(-5.67e-29f); |
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600 | |
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601 | |
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602 | //floatTest(-45.7e-32f); |
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603 | //floatTest(45.7e-33f); |
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604 | //floatTest(-45.7e-34f); |
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605 | //floatTest(45.7e-35f); |
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606 | } |
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