Added support for stream-like downloads of existing files to force_download()
Based on code/ideas from PR #365, #1254
diff --git a/system/helpers/download_helper.php b/system/helpers/download_helper.php
index 8fe66e2..31652d5 100644
--- a/system/helpers/download_helper.php
+++ b/system/helpers/download_helper.php
@@ -56,6 +56,23 @@
{
return FALSE;
}
+ elseif ($data === NULL)
+ {
+ if (@is_file($filename) && @file_exists($filename) && ($filesize = @filesize($filename)) !== FALSE)
+ {
+ $filepath = $filename;
+ $filename = explode('/', str_replace(DIRECTORY_SEPARATOR, '/', $filename));
+ $filename = end($filename);
+ }
+ else
+ {
+ return FALSE;
+ }
+ }
+ else
+ {
+ $filesize = strlen($data);
+ }
// Set the default MIME type to send
$mime = 'application/octet-stream';
@@ -95,8 +112,13 @@
$filename = implode('.', $x);
}
+ if ($data === NULL && ($fp = @fopen($filepath, 'rb')) === FALSE)
+ {
+ return FALSE;
+ }
+
// Clean output buffer
- if (ob_get_level() !== 0)
+ if (ob_get_level() !== 0 && @ob_end_clean() === FALSE)
{
ob_clean();
}
@@ -106,7 +128,7 @@
header('Content-Disposition: attachment; filename="'.$filename.'"');
header('Expires: 0');
header('Content-Transfer-Encoding: binary');
- header('Content-Length: '.strlen($data));
+ header('Content-Length: '.$filesize);
// Internet Explorer-specific headers
if (isset($_SERVER['HTTP_USER_AGENT']) && strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== FALSE)
@@ -116,7 +138,20 @@
header('Pragma: no-cache');
- exit($data);
+ // If we have raw data - just dump it
+ if ($data !== NULL)
+ {
+ exit($data);
+ }
+
+ // Flush 1MB chunks of data
+ while ( ! feof($fp) && ($data = fread($fp, 1048576)) !== FALSE)
+ {
+ echo $data;
+ }
+
+ fclose($fp);
+ exit;
}
}