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Posted to dev@pdfbox.apache.org by "Andreas Lehmkühler (Resolved JIRA)" <ji...@apache.org> on 2011/12/01 15:06:40 UTC

[jira] [Resolved] (PDFBOX-1175) Stream parsing performance improvement + patch

     [ https://issues.apache.org/jira/browse/PDFBOX-1175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andreas Lehmkühler resolved PDFBOX-1175.
----------------------------------------

       Resolution: Fixed
    Fix Version/s: 1.7.0
         Assignee: Andreas Lehmkühler

I added the improvements in revision 1209088 as proposed. I also added some string constants and reformatted some of the code.

Thanks for the contribution!
                
> Stream parsing performance improvement + patch
> ----------------------------------------------
>
>                 Key: PDFBOX-1175
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-1175
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Parsing
>    Affects Versions: 1.6.0
>            Reporter: Timo Boehme
>            Assignee: Andreas Lehmkühler
>            Priority: Minor
>             Fix For: 1.7.0
>
>         Attachments: BaseParser_readUntilEndStream.java
>
>
> Stream parsing is one of the critical parts looked from a performance point of view since typically most data is stored in streams. While PDFBOX already got some speedup some time ago in the method copying stream data from file to random access buffer (BaseParser#readUntilEndStream) there is some room for improvement.
> The problem with the current implementation is the byte wise reading and writing of the data. I have rewritten the method using byte arrays for IO and optimized the number of needed comparisons for finding 'endstream'/'endobj'. This results in 7-8 times faster parsing of streams and a 3-4 times faster parsing of a normal 10 page PDF.
> See the attached file which is a drop in replacement for the readUntilEndStream method in BaseParser.

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