[Bug 737708] New: pngdec: change parse logic

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=737708
  GStreamer | gst-plugins-good | unspecified

           Summary: pngdec: change parse logic
    Classification: Platform
           Product: GStreamer
           Version: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: vineeth.tm at samsung.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Right now in parse logic,
the signature is checked every time the parse function is called,
and the whole data is the scanned each and every time the parse function is
called, 
even though the data is scanned in the previous instance of parse being called.
Changing the logic such that, we skip the bytes which is already scanned in the
previous instances of parse.
This helps in avoiding multiple scan of already scanned data/signature.

Please check if this is proper.

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