owncloud /
music
| @@ 241-262 (lines=22) @@ | ||
| 238 | } |
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| 239 | ||
| 240 | if (!function_exists('NormalizeBinaryPoint')) { |
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| 241 | function NormalizeBinaryPoint($binarypointnumber, $maxbits=52) { |
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| 242 | // http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/binary.html |
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| 243 | if (strpos($binarypointnumber, '.') === false) { |
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| 244 | $binarypointnumber = '0.'.$binarypointnumber; |
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| 245 | } elseif ($binarypointnumber{0} == '.') { |
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| 246 | $binarypointnumber = '0'.$binarypointnumber; |
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| 247 | } |
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| 248 | $exponent = 0; |
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| 249 | while (($binarypointnumber{0} != '1') || (substr($binarypointnumber, 1, 1) != '.')) { |
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| 250 | if (substr($binarypointnumber, 1, 1) == '.') { |
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| 251 | $exponent--; |
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| 252 | $binarypointnumber = substr($binarypointnumber, 2, 1).'.'.substr($binarypointnumber, 3); |
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| 253 | } else { |
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| 254 | $pointpos = strpos($binarypointnumber, '.'); |
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| 255 | $exponent += ($pointpos - 1); |
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| 256 | $binarypointnumber = str_replace('.', '', $binarypointnumber); |
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| 257 | $binarypointnumber = $binarypointnumber{0}.'.'.substr($binarypointnumber, 1); |
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| 258 | } |
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| 259 | } |
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| 260 | $binarypointnumber = str_pad(substr($binarypointnumber, 0, $maxbits + 2), $maxbits + 2, '0', STR_PAD_RIGHT); |
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| 261 | return array('normalized'=>$binarypointnumber, 'exponent'=>(int) $exponent); |
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| 262 | } |
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| 263 | } |
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| 264 | ||
| 265 | if (!function_exists('Float2BinaryDecimal')) { |
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| @@ 152-173 (lines=22) @@ | ||
| 149 | * |
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| 150 | * @return array |
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| 151 | */ |
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| 152 | public static function NormalizeBinaryPoint($binarypointnumber, $maxbits=52) { |
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| 153 | if (strpos($binarypointnumber, '.') === false) { |
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| 154 | $binarypointnumber = '0.'.$binarypointnumber; |
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| 155 | } elseif ($binarypointnumber{0} == '.') { |
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| 156 | $binarypointnumber = '0'.$binarypointnumber; |
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| 157 | } |
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| 158 | $exponent = 0; |
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| 159 | while (($binarypointnumber{0} != '1') || (substr($binarypointnumber, 1, 1) != '.')) { |
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| 160 | if (substr($binarypointnumber, 1, 1) == '.') { |
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| 161 | $exponent--; |
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| 162 | $binarypointnumber = substr($binarypointnumber, 2, 1).'.'.substr($binarypointnumber, 3); |
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| 163 | } else { |
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| 164 | $pointpos = strpos($binarypointnumber, '.'); |
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| 165 | $exponent += ($pointpos - 1); |
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| 166 | $binarypointnumber = str_replace('.', '', $binarypointnumber); |
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| 167 | $binarypointnumber = $binarypointnumber{0}.'.'.substr($binarypointnumber, 1); |
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| 168 | } |
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| 169 | } |
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| 170 | $binarypointnumber = str_pad(substr($binarypointnumber, 0, $maxbits + 2), $maxbits + 2, '0', STR_PAD_RIGHT); |
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| 171 | return array('normalized'=>$binarypointnumber, 'exponent'=>(int) $exponent); |
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| 172 | } |
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| 173 | ||
| 174 | /** |
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| 175 | * @link http://www.scri.fsu.edu/~jac/MAD3401/Backgrnd/binary.html |
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| 176 | * |
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