Fixed quota stream's fseek method

- Added missing return statement
- Added missing support for SEEK_END
- Fixes #5524

1 files changed, 12 insertions, 2 deletions

diff --git a/lib/private/files/stream/quota.php b/lib/private/files/stream/quota.php
index 53d8a03d30f..87301c23614 100644
--- a/lib/private/files/stream/quota.php
+++ b/lib/private/files/stream/quota.php
@@ -66,12 +66,22 @@ class Quota {
 	}
 
 	public function stream_seek($offset, $whence = SEEK_SET) {
-		if ($whence === SEEK_SET) {
+		if ($whence === SEEK_END){
+			// go to the end to find out last position's offset
+			$oldOffset = $this->stream_tell();
+			if (fseek($this->source, 0, $whence) !== 0){
+				return false;
+			}
+			$whence = SEEK_SET;
+			$offset = $this->stream_tell() + $offset;
+			$this->limit += $oldOffset - $offset;
+		}
+		else if ($whence === SEEK_SET) {
 			$this->limit += $this->stream_tell() - $offset;
 		} else {
 			$this->limit -= $offset;
 		}
-		fseek($this->source, $offset, $whence);
+		return !fseek($this->source, $offset, $whence);
 	}
 
 	public function stream_tell() {