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<?php |
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declare(strict_types=1); |
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/** |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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* This software consists of voluntary contributions made by many individuals |
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* and is licensed under the LGPL. For more information please see |
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* <http://phing.info>. |
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*/ |
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/** |
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* SizeHelper class |
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* |
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* @author Jawira Portugal <[email protected]> |
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*/ |
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class SizeHelper |
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{ |
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const B = 'B'; |
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const KILO = 1000; |
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const KIBI = 1024; |
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const SI = [1 => ['kB', 'kilo', 'kilobyte',], |
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2 => ['MB', 'mega', 'megabyte',], |
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3 => ['GB', 'giga', 'gigabyte',], |
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4 => ['TB', 'tera', 'terabyte',],]; |
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const IEC = [0 => [self::B,], |
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1 => ['k', 'Ki', 'KiB', 'kibi', 'kibibyte',], |
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2 => ['M', 'Mi', 'MiB', 'mebi', 'mebibyte',], |
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3 => ['G', 'Gi', 'GiB', 'gibi', 'gibibyte',], |
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4 => ['T', 'Ti', 'TiB', 'tebi', 'tebibyte',],]; |
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/** |
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* Converts strings like '512K', '0.5G', '50M' to bytes. |
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*/ |
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public static function fromHumanToBytes(string $human): float |
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{ |
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[$size, $unit] = self::parseHuman($human); |
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$multiple = self::findUnitMultiple($unit); |
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return $size * $multiple; |
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} |
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/** |
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* Convert from bytes to any other valid unit. |
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*/ |
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public static function fromBytesTo(int $bytes, string $unit): float |
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{ |
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$multiple = self::findUnitMultiple($unit); |
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return $bytes / $multiple; |
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} |
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/** |
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* Extracts size and unit from strings like '1m', '50M', '100.55K', '2048'. |
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* |
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* - The default unit is 'B'. |
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* - If unit exists then it is returned as-is, even invalid units. |
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* - This function can also handle scientific notation, e.g. '8e10k'. |
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* - It can also handle negative values '-1M'. |
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* - Parsing is not locale aware, this means that '.' (dot) is always used as decimal separator. |
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* |
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* @param string $human Filesize as a human writes it. |
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* |
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* @return array{0: float, 1: string} First element is size, and second is the unit. |
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*/ |
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protected static function parseHuman(string $human): array |
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{ |
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// no unit, so we assume bytes |
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if (is_numeric($human)) { |
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return [floatval($human), self::B]; |
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} |
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$parsed = sscanf($human, '%f%s'); |
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if (empty($parsed[0])) { |
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throw new BuildException("Invalid size '$human'"); |
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} |
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return $parsed; |
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} |
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/** |
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* Finds the value in bytes of a single "unit". |
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*/ |
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protected static function findUnitMultiple(string $unit): int |
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{ |
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foreach (self::IEC as $exponent => $choices) { |
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if (in_array(strtolower($unit), array_map('strtolower', $choices))) { |
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return pow(self::KIBI, $exponent); |
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} |
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} |
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foreach (self::SI as $exponent => $choices) { |
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if (in_array(strtolower($unit), array_map('strtolower', $choices))) { |
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return pow(self::KILO, $exponent); |
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} |
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} |
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throw new BuildException("Invalid unit '$unit'"); |
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} |
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} |
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phingofficial /
phing
