/**
* Un-filter a stream object
*
* @param array $obj
* @return string
* @throws Exception
*/
protected function _unFilterStream($obj)
{
$filters = array();
if (isset($obj[1][1]['/Filter'])) {
$filter = $obj[1][1]['/Filter'];
if ($filter[0] == pdf_parser::TYPE_OBJREF) {
$tmpFilter = $this->resolveObject($filter);
$filter = $tmpFilter[1];
}
if ($filter[0] == pdf_parser::TYPE_TOKEN) {
$filters[] = $filter;
} else {
if ($filter[0] == pdf_parser::TYPE_ARRAY) {
$filters = $filter[1];
}
}
}
$stream = $obj[2][1];
foreach ($filters as $filter) {
switch ($filter[1]) {
case '/FlateDecode':
case '/Fl':
if (function_exists('gzuncompress')) {
$oStream = $stream;
$stream = strlen($stream) > 0 ? @gzuncompress($stream) : '';
} else {
throw new Exception(sprintf('To handle %s filter, please compile php with zlib support.', $filter[1]));
}
if ($stream === false) {
$tries = 0;
while ($tries < 8 && ($stream === false || strlen($stream) < strlen($oStream))) {
$oStream = substr($oStream, 1);
$stream = @gzinflate($oStream);
$tries++;
}
if ($stream === false) {
throw new Exception('Error while decompressing stream.');
}
}
break;
case '/LZWDecode':
require_once 'filters/FilterLZW.php';
$decoder = new FilterLZW();
$stream = $decoder->decode($stream);
break;
case '/ASCII85Decode':
require_once 'filters/FilterASCII85.php';
$decoder = new FilterASCII85();
$stream = $decoder->decode($stream);
break;
case '/ASCIIHexDecode':
require_once 'filters/FilterASCIIHexDecode.php';
$decoder = new FilterASCIIHexDecode();
$stream = $decoder->decode($stream);
break;
case null:
break;
default:
throw new Exception(sprintf('Unsupported Filter: %s', $filter[1]));
}
}
return $stream;
}
/**
* Rebuild content-streams
*
* @param array $obj
* @return string
*/
function _rebuildContentStream($obj)
{
$filters = array();
if (isset($obj[1][1]['/Filter'])) {
$_filter = $obj[1][1]['/Filter'];
if ($_filter[0] == PDF_TYPE_TOKEN) {
$filters[] = $_filter;
} else {
if ($_filter[0] == PDF_TYPE_ARRAY) {
$filters = $_filter[1];
}
}
}
$stream = $obj[2][1];
foreach ($filters as $_filter) {
switch ($_filter[1]) {
case "/FlateDecode":
if (function_exists('gzuncompress')) {
$stream = strlen($stream) > 0 ? @gzuncompress($stream) : '';
} else {
$this->fpdi->error(sprintf("To handle %s filter, please compile php with zlib support.", $_filter[1]));
}
if ($stream === false) {
$this->fpdi->error("Error while decompressing stream.");
}
break;
// mPDF 4.2.003
// mPDF 4.2.003
case '/LZWDecode':
include_once _MPDF_PATH . 'mpdfi/filters/FilterLZW.php';
// mPDF 5.0 Removed pass by reference =&
$decoder = new FilterLZW();
$stream = $decoder->decode($stream);
break;
case '/ASCII85Decode':
include_once _MPDF_PATH . 'mpdfi/filters/FilterASCII85.php';
// mPDF 5.0 Removed pass by reference =&
$decoder = new FilterASCII85();
$stream = $decoder->decode($stream);
break;
case null:
$stream = $stream;
break;
default:
$this->fpdi->error(sprintf("Unsupported Filter: %s", $_filter[1]));
}
}
return $stream;
}