DataSize.php

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<?php
namespace Magento\Framework\Convert;

class DataSize
{
    public function convertSizeToBytes($size)
    {
        if (!is_numeric($size)) {
            $type = strtoupper(substr($size, -1));
            $size = (int)$size;

            switch ($type) {
                case 'K':
                    $size *= 1024;
                    break;

                case 'M':
                    $size *= 1024 * 1024;
                    break;

                case 'G':
                    $size *= 1024 * 1024 * 1024;
                    break;

                default:
                    break;
            }
        }
        return (int)$size;
    }
}