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<?php

if (!defined('RANDOM_COMPAT_READ_BUFFER')) {
    define('RANDOM_COMPAT_READ_BUFFER', 8);
}
if (!is_callable('random_bytes')) {
    function random_bytes($bytes)
    {
        static $fp = null;
        if (empty($fp)) {
            $fp = fopen('/dev/urandom', 'rb');
            if (!empty($fp)) {
                $st = fstat($fp);
                if (($st['mode'] & 0170000) !== 020000) {
                    fclose($fp);
                    $fp = false;
                }
            }
            if (!empty($fp)) {
                if (is_callable('stream_set_read_buffer')) {
                    stream_set_read_buffer($fp, RANDOM_COMPAT_READ_BUFFER);
                }
                if (is_callable('stream_set_chunk_size')) {
                    stream_set_chunk_size($fp, RANDOM_COMPAT_READ_BUFFER);
                }
            }
        }
        try {
            $bytes = RandomCompat_intval($bytes);
        } catch (TypeError $ex) {
            throw new TypeError('random_bytes(): $bytes must be an integer');
        }
        if ($bytes < 1) {
            throw new Error('Length must be greater than 0');
        }
        if (!empty($fp)) {
            $remaining = $bytes;
            $buf = '';
            do {
                $read = fread($fp, $remaining);
                if (!is_string($read)) {
                    if ($read === false) {
                        $buf = false;
                        break;
                    }
                }
                $remaining -= RandomCompat_strlen($read);
                $buf = $buf . $read;
            } while ($remaining > 0);
            if (is_string($buf)) {
                if (RandomCompat_strlen($buf) === $bytes) {
                    return $buf;
                }
            }
        }
        throw new Exception('Error reading from source device');
    }
}