[PDFBOX-2999] Optimize COSStream scratch file usage

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Component/s: PDModel
• Assignee: Andreas Lehmkühler
• Reporter: Timo Boehme
• Created: 28/Sep/15 21:48
• Updated: 03/Dec/20 16:15
• Resolved: 03/Dec/20 16:15

Description

The usage of scratch file buffers in COSStreams is quite sloppy. A never filled buffer is created in the beginning and existing buffers are discarded without being closed when a variant of createOutputStream is called. Furthermore it should be clarified if requesting an input stream without having created an output stream before is ok and if a returned input stream keeps valid after a new output stream is created (which is crucial for proper buffer-closing).

This issue should resolve some of the shortcomings and document the expected or even required usage of COSStream.

Issue Links

• is related to: PDFBOX-3359 Drawing to Graphics2D / ScratchFileBuffer not closed
• is related to: PDFBOX-4396 Memory leak due to soft reference caching