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 |
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13 | co-programmer: ... |
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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 | |
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25 | |
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26 | /* using namespace std is default, this needs to be here */ |
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27 | using namespace std; |
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28 | |
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29 | /*! |
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30 | * Standard constructor |
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31 | */ |
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32 | Converter::Converter() |
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33 | { |
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34 | /* set the class id for the base object */ |
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35 | //this->setClassID(CL_ENTITY_MANAGER, "EntityManager"); |
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36 | } |
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37 | |
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38 | /*! |
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39 | * Standard destructor |
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40 | */ |
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41 | Converter::~Converter() |
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42 | { |
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43 | } |
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44 | |
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45 | const int sgnadd = 128; // = 2^7 |
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46 | |
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47 | /*! |
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48 | * Converts an int into a byte-array |
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49 | * @remarks: The int is stored in big-endian |
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50 | * @param x: The int which is to convert |
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51 | * @return: A byte-array that accords the given int value |
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52 | */ |
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53 | byte* Converter::intToByteArray(int x) |
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54 | { |
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55 | const int mod = 256; // = 2^8 |
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56 | |
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57 | |
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58 | byte* result = new byte[INTSIZE]; |
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59 | int sgn; |
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60 | if (x >= 0) |
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61 | sgn = 1; |
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62 | else |
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63 | { |
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64 | sgn = -1; |
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65 | x = -x; |
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66 | } |
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67 | |
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68 | for (int i = 0; i < INTSIZE; i++) |
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69 | { |
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70 | result[i] = x % mod; |
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71 | x /= mod; |
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72 | } |
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73 | |
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74 | if (sgn == -1) |
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75 | result[INTSIZE - 1] += sgnadd; |
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76 | |
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77 | |
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78 | return result; |
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79 | } |
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80 | |
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81 | /*! |
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82 | * Converts a byte-array into an int |
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83 | * @param a: The byte-array which is to convert |
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84 | * @return: An int that accords the given byte-array |
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85 | */ |
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86 | int Converter::byteArrayToInt(const byte* a) |
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87 | { |
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88 | int mult = 1; |
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89 | const int step = 256; // = 2 ^ 8 |
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90 | int result = 0; |
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91 | for (int i = 0; i < INTSIZE - 1; i++) |
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92 | { |
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93 | result += a[i] * mult; |
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94 | mult *= step; |
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95 | } |
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96 | |
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97 | if (a[INTSIZE - 1] >= sgnadd) |
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98 | { |
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99 | result += (a[INTSIZE - 1] - sgnadd) * mult; |
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100 | result *= -1; |
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101 | } |
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102 | else |
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103 | result += a[INTSIZE - 1] * mult; |
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104 | |
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105 | return result; |
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106 | } |
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107 | |
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108 | /*! |
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109 | * Converts a float into a string containing its binary representation |
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110 | */ |
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111 | char* Converter::floatToBinString(float x) |
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112 | { |
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113 | char* result = new char[200]; |
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114 | int pos = 0; |
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115 | |
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116 | if (x < 0) |
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117 | { |
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118 | result[pos++] = '-'; |
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119 | x = -x; |
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120 | } |
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121 | |
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122 | float sub = 1; |
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123 | while (sub < x) |
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124 | sub *= 2; |
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125 | |
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126 | while ((x > 0 || sub >= 1) && pos < 200) |
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127 | { |
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128 | if (x >= sub) |
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129 | { |
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130 | result[pos] = '1'; |
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131 | x -= sub; |
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132 | } |
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133 | else |
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134 | result[pos] = '0'; |
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135 | pos++; |
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136 | sub /= 2; |
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137 | |
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138 | if (sub == 0.5f) |
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139 | result[pos++] = '.'; |
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140 | } |
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141 | |
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142 | return result; |
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143 | } |
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144 | |
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145 | const int expmult = 8388608; //2^23 |
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146 | |
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147 | /*! |
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148 | * Converts a float value into a byte-array |
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149 | * @param x: The float which is to convert |
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150 | * @return: A byte-array which accords the given float |
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151 | */ |
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152 | byte* Converter::floatToByteArray(float x) |
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153 | { |
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154 | int mantisse = 0; |
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155 | int exponent = 128; |
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156 | |
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157 | int sgn; |
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158 | if (x < 0) |
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159 | { |
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160 | x = -x; |
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161 | sgn = -1; |
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162 | } |
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163 | else |
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164 | sgn = 1; |
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165 | |
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166 | float sub = 1; |
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167 | while (sub < x) |
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168 | { |
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169 | sub *= 2; |
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170 | exponent++; |
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171 | } |
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172 | |
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173 | while (x > 0) |
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174 | { |
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175 | if (x >= sub) |
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176 | { |
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177 | mantisse += 1; |
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178 | x -= sub; |
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179 | } |
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180 | |
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181 | mantisse *= 2; |
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182 | exponent--; |
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183 | sub /= 2; |
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184 | } |
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185 | exponent++; |
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186 | mantisse /= 2; |
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187 | while (mantisse < expmult) |
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188 | { |
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189 | mantisse *= 2; |
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190 | exponent--; |
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191 | } |
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192 | |
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193 | //printf("mantisse = %i exponent = %i \n", mantisse, exponent); |
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194 | |
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195 | mantisse -= expmult; |
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196 | |
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197 | int hx = mantisse + expmult * exponent; |
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198 | byte* result = intToByteArray(hx); |
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199 | if (sgn == -1) |
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200 | result[3] += sgnadd; |
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201 | |
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202 | return result; |
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203 | } |
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204 | |
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205 | |
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206 | /*! |
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207 | * Converts a byte-array into a float value |
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208 | * @param a: The byte-array which is to convert |
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209 | * @return: A float value which accords the given byte-array |
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210 | */ |
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211 | float Converter::byteArrayToFloat(byte* a) |
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212 | { |
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213 | int hmant = a[0] + a[1] * 256 + a[2] * 65536; |
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214 | int mantisse = hmant % expmult; |
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215 | mantisse += expmult; |
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216 | |
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217 | int hexp = a[2] + a[3] * 256; |
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218 | int exponent = (hexp / 128) % 256 - 128; |
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219 | |
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220 | int sgn; |
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221 | if (a[3] >= sgnadd) |
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222 | sgn = -1; |
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223 | else |
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224 | sgn = 1; |
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225 | |
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226 | //printf("mantisse = %i exponent = %i \n", mantisse, exponent); |
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227 | |
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228 | float emult = 1; |
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229 | if (exponent > 0) |
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230 | for (int i = 0; i < exponent; i++) |
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231 | emult *= 2; |
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232 | else if (exponent < 0) |
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233 | for (int i = 0; i > exponent; i--) |
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234 | emult /= 2; |
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235 | |
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236 | float result = mantisse * emult; |
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237 | if (sgn == -1) |
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238 | result = -result; |
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239 | |
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240 | return result; |
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241 | } |
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242 | |
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243 | /*! |
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244 | * Converts a float value into a byte-array |
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245 | * @param x: The float which is to convert |
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246 | * @return: A byte-array which accords the given float |
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247 | */ |
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248 | byte* Converter::_floatToByteArray(float x) |
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249 | { |
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250 | byte* p = (byte*)&x; |
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251 | byte* result = new byte[4]; |
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252 | for (int i = 0; i < 4; i++) |
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253 | result[i] = p[i]; |
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254 | return result; |
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255 | } |
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256 | |
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257 | |
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258 | /*! |
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259 | * Converts a byte-array into a float value |
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260 | * @param a: The byte-array which is to convert |
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261 | * @return: A float value which accords the given byte-array |
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262 | */ |
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263 | float Converter::_byteArrayToFloat(byte* a) |
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264 | { |
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265 | float* p = (float*)a; |
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266 | float result = *p; |
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267 | return result; |
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268 | } |
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