helper/file.class.php

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<?php
class helper_file extends object {

        public function valid(array $file, array $prm = array()) {
                if (empty($file) || (isset($file['size']) && $file['size'] == 0))
                        return true;
                
                if ($this->cfg->maxsize && $file['size'] > $this->cfg->maxsize)
                        return sprintf($this->cfg->getInArray('validErrors', 'maxsize'), '%s', file::humanSize($this->cfg->maxsize, true));
                
                $type = $file['type'] != 'application/octet-stream' ? $file['type'] : file::getType($file['name']);
                if (count($this->cfg->mime) > 0 && !in_array($type, $this->cfg->mime))
                        return $this->cfg->getInArray('validErrors', 'mime');
                
                return true;
        }

}