1 | <?php |
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2 | /* |
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3 | * --:: JPEG MetaDatas ::------------------------------------------------------- |
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4 | * |
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5 | * Author : Grum |
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6 | * email : grum at piwigo.org |
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7 | * website : http://photos.grum.fr |
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8 | * |
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9 | * << May the Little SpaceFrog be with you ! >> |
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10 | * |
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11 | * +-----------------------------------------------------------------------+ |
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12 | * | JpegMetaData - a PHP based Jpeg Metadata manager | |
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13 | * +-----------------------------------------------------------------------+ |
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14 | * | Copyright(C) 2010 Grum - http://www.grum.fr | |
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15 | * +-----------------------------------------------------------------------+ |
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16 | * | This program is free software; you can redistribute it and/or modify | |
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17 | * | it under the terms of the GNU General Public License as published by | |
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18 | * | the Free Software Foundation | |
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19 | * | | |
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20 | * | This program is distributed in the hope that it will be useful, but | |
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21 | * | WITHOUT ANY WARRANTY; without even the implied warranty of | |
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22 | * | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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23 | * | General Public License for more details. | |
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24 | * | | |
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25 | * | You should have received a copy of the GNU General Public License | |
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26 | * | along with this program; if not, write to the Free Software | |
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27 | * | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
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28 | * | USA. | |
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29 | * +-----------------------------------------------------------------------+ |
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30 | * |
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31 | * |
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32 | * ----------------------------------------------------------------------------- |
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33 | * |
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34 | * ConvertData class is used to convert data from a type into another type |
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35 | * |
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36 | * This class provides theses public functions : |
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37 | * - (static) toUByte |
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38 | * - (static) toSByte |
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39 | * - (static) toUShort |
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40 | * - (static) toSShort |
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41 | * - (static) toULong |
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42 | * - (static) toSLong |
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43 | * - (static) toURational |
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44 | * - (static) toSRational |
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45 | * - (static) toExposureTime |
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46 | * - (static) toFNumber |
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47 | * - (static) toDateTime |
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48 | * - (static) toFocalLength |
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49 | * - (static) toEV |
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50 | * - (static) toDistance |
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51 | * - (static) toStrings |
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52 | * - (static) toDMS |
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53 | * - (static) toHexDump |
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54 | * |
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55 | * ----------------------------------------------------------------------------- |
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56 | */ |
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57 | |
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58 | require_once(JPEG_METADATA_DIR."Common/Const.class.php"); |
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59 | |
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60 | class ConvertData |
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61 | { |
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62 | /** |
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63 | * Convert the given data into a single unsigned Byte (8bit) |
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64 | * |
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65 | * @param String $data : representing the unsigned Byte |
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66 | * @return UByte |
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67 | */ |
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68 | static public function toUByte($data) |
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69 | { |
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70 | if(strlen($data)>=1) |
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71 | return(ord($data{0})); |
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72 | else |
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73 | return(0); |
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74 | } |
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75 | |
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76 | /** |
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77 | * Convert the given data into a single signed Byte (8bit) |
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78 | * |
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79 | * @param String $data : representing the signed Byte |
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80 | * @return SByte |
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81 | */ |
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82 | static public function toSByte($data) |
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83 | { |
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84 | $unsigned = self::toUByte($data); |
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85 | if($unsigned>127) |
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86 | return($unsigned-256); |
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87 | else |
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88 | return($unsigned); |
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89 | } |
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90 | |
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91 | /** |
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92 | * Convert the given data into an unsigned Short integer (16bit) |
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93 | * |
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94 | * @param String $data : representing the unsigned Short |
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95 | * @param String $endianType : the byte order |
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96 | * @return UShort |
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97 | */ |
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98 | static public function toUShort($data, $endianType) |
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99 | { |
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100 | if(strlen($data)>=2) |
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101 | { |
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102 | if($endianType==BYTE_ORDER_LITTLE_ENDIAN) |
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103 | return(ord($data{0}) + |
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104 | ord($data{1})*256); |
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105 | else |
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106 | return(ord($data{0})*256 + |
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107 | ord($data{1})); |
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108 | } |
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109 | else |
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110 | { |
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111 | return(0); |
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112 | } |
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113 | } |
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114 | |
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115 | /** |
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116 | * Convert the given data into a signed Short integer (16bit) |
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117 | * |
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118 | * @param String $data : representing the signed Short |
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119 | * @param String $endianType : the byte order |
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120 | * @return SShort |
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121 | */ |
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122 | static public function toSShort($data, $endianType) |
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123 | { |
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124 | $unsigned = self::toUShort($data, $endianType); |
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125 | if($unsigned>32767) |
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126 | return($unsigned-65536); |
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127 | else |
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128 | return($unsigned); |
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129 | } |
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130 | |
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131 | /** |
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132 | * Convert the given data into an unsigned Long integer (32bit) |
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133 | * |
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134 | * @param String $data : representing the unsigned Long |
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135 | * @param String $endianType : the byte order |
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136 | * @return ULong |
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137 | */ |
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138 | static public function toULong($data, $endianType) |
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139 | { |
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140 | if(strlen($data)>=4) |
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141 | { |
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142 | if($endianType==BYTE_ORDER_LITTLE_ENDIAN) |
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143 | return(ord($data{0}) + |
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144 | ord($data{1})*256 + |
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145 | ord($data{2})*65536 + |
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146 | ord($data{3})*16777216); |
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147 | else |
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148 | return(ord($data{0})*16777216 + |
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149 | ord($data{1})*65536 + |
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150 | ord($data{2})*256 + |
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151 | ord($data{3})); |
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152 | } |
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153 | else |
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154 | { |
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155 | return(0); |
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156 | } |
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157 | } |
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158 | |
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159 | /** |
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160 | * Convert the given data into a signed Long integer (32bit) |
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161 | * |
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162 | * @param String $data : representing the signed Long |
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163 | * @param String $endianType : the byte order |
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164 | * @return SLong |
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165 | */ |
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166 | static public function toSLong($data, $endianType) |
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167 | { |
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168 | $unsigned = self::toULong($data, $endianType); |
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169 | if($unsigned>2147483647) |
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170 | return($unsigned-4294967296); |
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171 | else |
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172 | return($unsigned); |
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173 | } |
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174 | |
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175 | /** |
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176 | * Convert the given data into an array of unsigned Long (2x32bit) |
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177 | * |
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178 | * @param String $data : representing the unsigned Rational |
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179 | * @param String $endianType : the byte order |
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180 | * @return URational |
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181 | */ |
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182 | static public function toURational($data, $endianType) |
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183 | { |
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184 | if(strlen($data)>=8) |
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185 | { |
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186 | return( |
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187 | Array( |
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188 | self::toULong($data, $endianType), |
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189 | self::toULong(substr($data, 4), $endianType) |
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190 | ) |
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191 | ); |
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192 | } |
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193 | else |
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194 | { |
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195 | return(Array(0,0)); |
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196 | } |
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197 | } |
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198 | |
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199 | /** |
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200 | * Convert the given data into an array of signed Long (2x32bit) |
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201 | * |
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202 | * @param String $data : representing the signed Rational |
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203 | * @param String $endianType : the byte order |
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204 | * @return SRational |
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205 | */ |
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206 | static public function toSRational($data, $endianType) |
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207 | { |
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208 | if(strlen($data)>=8) |
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209 | { |
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210 | return( |
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211 | Array( |
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212 | self::toSLong($data, $endianType), |
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213 | self::toSLong(substr($data, 4), $endianType) |
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214 | ) |
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215 | ); |
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216 | } |
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217 | else |
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218 | { |
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219 | return(Array(0,0)); |
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220 | } |
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221 | } |
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222 | |
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223 | /** |
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224 | * Convert a floating value exprimed in seconds into a "photographic" |
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225 | * value |
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226 | * |
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227 | * example : |
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228 | * 1.5 => "1.5s" |
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229 | * 0.004 => "1/250s" * |
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230 | * |
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231 | * @param Float $time : time to convert |
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232 | * @return String |
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233 | */ |
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234 | static public function toExposureTime($time) |
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235 | { |
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236 | if($time>=1 or $time==0) |
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237 | { |
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238 | return($time."s"); |
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239 | } |
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240 | else |
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241 | { |
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242 | return(sprintf("1/%ds", 1/$time)); |
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243 | } |
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244 | } |
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245 | |
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246 | /** |
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247 | * Convert a floating value in a f/x.y string |
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248 | * |
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249 | * example : |
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250 | * 1.8 => "f/1.8" |
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251 | * 8 => "f/8.0" |
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252 | * |
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253 | * @param Float $fNumber : fnumber |
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254 | * @return String |
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255 | */ |
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256 | static public function toFNumber($fNumber) |
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257 | { |
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258 | return(sprintf("f/%.1f", $fNumber)); |
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259 | } |
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260 | |
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261 | /** |
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262 | * Convert a string Date/Time into a DateTime object |
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263 | * |
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264 | * Example of valid string : |
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265 | * "2009:12:24 19:54" |
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266 | * "2009:12:24 19:54\x00" |
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267 | * "2009:12:24 19:54:38" |
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268 | * "2009:12:24 19:54:38\x00" |
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269 | * "2009-12-24 19:54" |
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270 | * "2009-12-24T19:54" |
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271 | * "2009-12-24 19:54:38" |
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272 | * "2009-12-24T19:54:38" |
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273 | * "2009-12-24 19:54Z" |
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274 | * "2009-12-24T19:54Z" |
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275 | * "2009-12-24 19:54:38Z" |
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276 | * "2009-12-24T19:54:38Z" |
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277 | * "2009-12-24 19:54+02:00" |
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278 | * "2009-12-24T19:54+02:00" |
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279 | * "2009-12-24 19:54:38+02:00" |
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280 | * "2009-12-24T19:54:38+02:00" |
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281 | * "20091224" |
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282 | * |
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283 | * returns null if date is not a valid date |
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284 | * |
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285 | * @param String $dateTime : date time in a valid format |
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286 | * @return String |
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287 | */ |
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288 | static public function toDateTime($dateTime) |
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289 | { |
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290 | if(preg_match('/^('. |
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291 | '\d{4}:\d{2}:\d{2}\s\d{2}:\d{2}(:\d{2}){0,1}\x00{0,1}|'. |
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292 | '\d{4}-\d{2}-\d{2}(T|\s)\d{2}:\d{2}(:\d{2}){0,1}(Z|[+|-]\d{2}:\d{2}){0,1}|'. |
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293 | '\d{4}\d{2}\d{2}'. |
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294 | ')$/', $dateTime)) |
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295 | { |
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296 | $returned=new DateTime($dateTime, new DateTimeZone("UTC")); |
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297 | } |
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298 | else |
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299 | { |
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300 | $returned=null; |
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301 | } |
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302 | return($returned); |
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303 | } |
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304 | |
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305 | /** |
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306 | * Convert a floating value in a focal length string |
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307 | * |
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308 | * Example: |
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309 | * 250 => "250.0mm" |
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310 | * |
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311 | * @param Float $focalLength : focal length in millimeters |
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312 | * @return String |
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313 | */ |
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314 | static public function toFocalLength($focalLength) |
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315 | { |
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316 | return(sprintf("%.1f mm", $focalLength)); |
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317 | } |
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318 | |
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319 | /** |
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320 | * Convert a floating value in an EV |
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321 | * |
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322 | * Example: |
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323 | * 0.7 => "0.7 EV" |
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324 | * |
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325 | * @param Float $ev : EV |
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326 | * @return String |
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327 | */ |
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328 | static public function toEV($ev) |
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329 | { |
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330 | return(sprintf("%.1f EV", $ev)); |
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331 | } |
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332 | |
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333 | /** |
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334 | * Convert a floating value associated with a unit |
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335 | * |
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336 | * Example : |
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337 | * 3.4 + "m" => "3.40 m" |
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338 | * |
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339 | * @param Float $distance : distance |
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340 | * @param String $unit : unit |
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341 | * @return String |
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342 | */ |
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343 | static public function toDistance($distance, $unit) |
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344 | { |
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345 | return(sprintf("%.2f ", $distance)).$unit; |
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346 | } |
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347 | |
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348 | /** |
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349 | * Convert a null terminated string into a string |
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350 | * or |
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351 | * Convert multiples null terminated string into an array of string |
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352 | * ==> if strings are null (eq. "\x00") nothing is added to the array |
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353 | * |
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354 | * Example: |
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355 | * "test" => "test" |
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356 | * "test\x00" => "test" |
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357 | * "test1\x00test2\x00" => Array("test1", "test2") |
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358 | * |
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359 | * @param String $strings |
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360 | * @return String or String[] |
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361 | */ |
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362 | static public function toStrings($strings) |
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363 | { |
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364 | if(strpos($strings, chr(0))===false) |
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365 | return($strings); |
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366 | |
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367 | $occurs=preg_match_all('/(.*)\x00/U',$strings,$result); |
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368 | if($occurs==0) |
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369 | { |
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370 | return(""); |
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371 | } |
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372 | else |
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373 | { |
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374 | $returned=Array(); |
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375 | foreach($result[1] as $pop) |
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376 | { |
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377 | if($pop!="") |
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378 | { |
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379 | $returned[]=$pop; |
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380 | } |
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381 | } |
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382 | if(count($returned)==1) |
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383 | { |
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384 | return($returned[0]); |
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385 | } |
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386 | elseif(count($returned)==0) |
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387 | { |
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388 | return(""); |
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389 | } |
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390 | else |
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391 | { |
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392 | return($returned); |
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393 | } |
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394 | } |
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395 | } |
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396 | |
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397 | /** |
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398 | * Convert 3 rationnals (EXIF GPS format) into a Degree, Minute, Second into |
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399 | * a formatted string dd° mm' ss.cs" |
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400 | * |
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401 | * Example: |
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402 | * 48/1 + 1600/100 + 347/10 => "48° 16' 34.70"" |
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403 | * |
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404 | * @param URational $degrees : degrees |
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405 | * @param URational $minutes : minutes |
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406 | * @param URational $seconds : seconds |
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407 | * @return String |
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408 | */ |
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409 | static public function toDMS($degrees, $minutes, $seconds) |
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410 | { |
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411 | if($degrees[1]==0) $degrees[1]=1; |
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412 | if($minutes[1]==0) $minutes[1]=1; |
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413 | if($seconds[1]==0) $seconds[1]=1; |
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414 | |
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415 | $deg=$degrees[0]/$degrees[1]; |
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416 | $min=($minutes[0]/$minutes[1])-((int)$deg-$deg)*60; |
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417 | $sec=($seconds[0]/$seconds[1])-((int)$min-$min)*60; |
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418 | |
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419 | $returned=sprintf("%d° %d' %.2f\"", $deg, $min, $sec); |
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420 | |
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421 | return($returned); |
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422 | } |
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423 | |
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424 | |
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425 | /** |
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426 | * Dump the given data into an hex string |
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427 | * |
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428 | * @param $data : data to be dumped (the dump is function of the |
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429 | * data type) |
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430 | * @param UByte $type : the type of data (uses the ByteType values) |
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431 | * @param UShort $maxItems : for arrays (or ASCII string), the number or |
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432 | * items (chars) to dump |
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433 | * @return String |
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434 | */ |
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435 | static public function toHexDump($data, $type, $maxItems = 0) |
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436 | { |
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437 | $returned=""; |
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438 | if(is_array($data)) |
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439 | { |
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440 | if($maxItems==0) |
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441 | { |
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442 | $maxItems=count($data); |
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443 | } |
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444 | elseif($maxItems>count($data)) |
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445 | { |
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446 | $maxItems=count($data); |
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447 | } |
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448 | else |
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449 | { |
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450 | $returned.="[returns only the first $maxItems of ".count($data)." values] "; |
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451 | } |
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452 | |
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453 | $tmp=Array(); |
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454 | for($i=0;$i<$maxItems;$i++) |
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455 | { |
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456 | $tmp[]=self::toHexDump($data[$i], $type, $maxItems); |
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457 | } |
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458 | $returned.="[".implode(",", $tmp)."]"; |
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459 | } |
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460 | else |
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461 | { |
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462 | switch($type) |
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463 | { |
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464 | case ByteType::UBYTE : |
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465 | case ByteType::SBYTE : |
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466 | $returned.=sprintf("0x%02x", $data); |
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467 | break; |
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468 | case ByteType::USHORT : |
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469 | case ByteType::SSHORT : |
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470 | $returned.=sprintf("0x%04x", $data); |
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471 | break; |
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472 | case ByteType::ULONG : |
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473 | case ByteType::SLONG : |
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474 | $returned.=sprintf("0x%08x", $data); |
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475 | break; |
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476 | case ByteType::URATIONAL : |
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477 | case ByteType::SRATIONAL : |
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478 | $returned.=sprintf("0x%08x", $data); |
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479 | break; |
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480 | case ByteType::FLOAT : |
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481 | case ByteType::DOUBLE : |
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482 | case ByteType::ASCII : |
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483 | case ByteType::UNDEFINED : |
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484 | default: |
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485 | if($maxItems==0) |
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486 | { |
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487 | $maxItems=strlen($data); |
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488 | } |
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489 | elseif($maxItems>strlen($data)) |
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490 | { |
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491 | $maxItems=strlen($data); |
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492 | } |
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493 | else |
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494 | { |
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495 | $returned.="[returns only the first $maxItems of ".strlen($data)." bytes] "; |
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496 | } |
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497 | |
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498 | $tmp=array(); |
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499 | for($i=0;$i<$maxItems;$i++) |
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500 | { |
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501 | $tmp[]=sprintf("%02x", ord($data{$i})); |
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502 | } |
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503 | $returned.=implode(" ", $tmp); |
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504 | break; |
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505 | } |
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506 | } |
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507 | return($returned); |
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508 | } |
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509 | |
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510 | |
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511 | } |
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512 | |
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513 | |
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514 | ?> |
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