encodeByteStream() public method

Encode $in to $out.
public encodeByteStream ( Swift_OutputByteStream $os, Swift_InputByteStream $is, integer $firstLineOffset, integer $maxLineLength )
$os Swift_OutputByteStream to read from
$is Swift_InputByteStream to write to
$firstLineOffset integer
$maxLineLength integer 0 indicates the default length for this encoding
 public function testEncodingAndDecodingSamples()
 {
     $sampleFp = opendir($this->_samplesDir);
     while (false !== ($encodingDir = readdir($sampleFp))) {
         if (substr($encodingDir, 0, 1) == '.') {
             continue;
         }
         $sampleDir = $this->_samplesDir . '/' . $encodingDir;
         if (is_dir($sampleDir)) {
             $fileFp = opendir($sampleDir);
             while (false !== ($sampleFile = readdir($fileFp))) {
                 if (substr($sampleFile, 0, 1) == '.') {
                     continue;
                 }
                 $text = file_get_contents($sampleDir . '/' . $sampleFile);
                 $os = new Swift_ByteStream_ArrayByteStream();
                 $os->write($text);
                 $is = new Swift_ByteStream_ArrayByteStream();
                 $this->_encoder->encodeByteStream($os, $is);
                 $encoded = '';
                 while (false !== ($bytes = $is->read(8192))) {
                     $encoded .= $bytes;
                 }
                 $this->assertEquals(quoted_printable_decode($encoded), preg_replace('~\\r(?!\\n)|(?<!\\r)\\n~', "\r\n", $text), '%s: Encoded string should decode back to original string for sample ' . $sampleDir . '/' . $sampleFile);
             }
             closedir($fileFp);
         }
     }
     closedir($sampleFp);
 }