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

["Andreas Lehmkühler (Updated JIRA)" <ji...@apache.org>]

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

Andreas Lehmkühler updated PDFBOX-1175:
---------------------------------------

    Affects Version/s:     (was: 1.7.0)
                       1.6.0
    
> 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
>            Priority: Minor
>         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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