SizeViewHelper.php

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<?php
namespace TYPO3\CMS\Install\ViewHelpers\File;

use TYPO3\CMS\Core\Utility\GeneralUtility;

class SizeViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

    public function render($format = TRUE) {
        $absolutePathToFile = $this->renderChildren();
        if (!is_file($absolutePathToFile)) {
            throw new \TYPO3\CMS\Install\ViewHelpers\Exception(
                'File not found',
                1369563246
            );
        }
        $size = filesize($absolutePathToFile);
        if ($format) {
            $size = GeneralUtility::formatSize($size);
        }
        return $size;
    }
}