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<?php
namespace Shaarli;
use Shaarli\Exceptions\IOException;
/**
* Class FileUtils
*
* Utility class for file manipulation.
*/
class FileUtils
{
/**
* @var string
*/
protected static $phpPrefix = '<?php /* ';
/**
* @var string
*/
protected static $phpSuffix = ' */ ?>';
/**
* Write data into a file (Shaarli database format).
* The data is stored in a PHP file, as a comment, in compressed base64 format.
*
* The file will be created if it doesn't exist.
*
* @param string $file File path.
* @param mixed $content Content to write.
*
* @return int|bool Number of bytes written or false if it fails.
*
* @throws IOException The destination file can't be written.
*/
public static function writeFlatDB($file, $content)
{
if (is_file($file) && !is_writeable($file)) {
// The datastore exists but is not writeable
throw new IOException($file);
} elseif (!is_file($file) && !is_writeable(dirname($file))) {
// The datastore does not exist and its parent directory is not writeable
throw new IOException(dirname($file));
}
return file_put_contents(
$file,
self::$phpPrefix . base64_encode(gzdeflate(serialize($content))) . self::$phpSuffix
);
}
/**
* Read data from a file containing Shaarli database format content.
*
* If the file isn't readable or doesn't exist, default data will be returned.
*
* @param string $file File path.
* @param mixed $default The default value to return if the file isn't readable.
*
* @return mixed The content unserialized, or default if the file isn't readable, or false if it fails.
*/
public static function readFlatDB($file, $default = null)
{
// Note that gzinflate is faster than gzuncompress.
// See: http://www.php.net/manual/en/function.gzdeflate.php#96439
if (!is_readable($file)) {
return $default;
}
$data = file_get_contents($file);
if ($data == '') {
return $default;
}
return unserialize(
gzinflate(
base64_decode(
substr($data, strlen(self::$phpPrefix), -strlen(self::$phpSuffix))
)
)
);
}
}
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