/**
* Reads the file, detects the compression MIME type, closes the file
* and returns the MIME type
*
* @param resource $file the file handle
*
* @return string the MIME type for compression, or 'none'
*/
public static function getCompressionMimeType($file)
{
//Can't use PMA_StringMB here, so force use of PMA_StringNative.
include_once 'libraries/StringNative.class.php';
$pmaString = new PMA_StringNative();
$test = fread($file, 4);
$len = $pmaString->strlen($test);
fclose($file);
if ($len >= 2 && $test[0] == $pmaString->chr(31) && $test[1] == $pmaString->chr(139)) {
return 'application/gzip';
}
if ($len >= 3 && $pmaString->substr($test, 0, 3) == 'BZh') {
return 'application/bzip2';
}
if ($len >= 4 && $test == "PK") {
return 'application/zip';
}
return 'none';
}
/**
* Tests for chr
*
* @param string $ascii Ascii code
*
* @return void
* @test
* @dataProvider providerChr
*/
public function testChr($ascii)
{
$native = $this->_native->chr($ascii);
$multibytes = $this->_mb->chr($ascii);
$this->assertTrue($native === $multibytes, 'native chr: ' . var_export($native, true) . ' - mb chr: ' . var_export($multibytes, true));
}