[jira] [Resolved] (PDFBOX-4811) Glyphs getting lost when rendering

["Tilman Hausherr (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-4811?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tilman Hausherr resolved PDFBOX-4811.
-------------------------------------
    Resolution: Fixed

> Glyphs getting lost when rendering
> ----------------------------------
>
>                 Key: PDFBOX-4811
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4811
>             Project: PDFBox
>          Issue Type: Bug
>          Components: FontBox
>    Affects Versions: 2.0.19
>            Reporter: Tilman Hausherr
>            Assignee: Tilman Hausherr
>            Priority: Major
>             Fix For: 2.0.20, 3.0.0 PDFBox
>
>         Attachments: PDFJS-11768.pdf-1-after.png, PDFJS-11768.pdf-1-before.png
>
>
> I missed a rendering change (sorry) in the linked PDF.js issue that happened in PDFBOX-4810 but it is not a regression, rather a difference in displaying a bad input due to having different data.
> The CMap has these ranges:
> {code:java}
> 4 begincodespacerange
> <00><7f>
> <c080><dfbf>
> <e08080><efbfbf>
> <f0808080><f7bfbfbf>
> endcodespacerange
> {code}
> The content stream has segments like
> {code:java}
> (Check\340up Date:2020/ 3/ 4  11:46) Tj
> {code}
> 0340 is 0xE0. The current code at CMap.readCode() reads bytes until a range fits, and this means it reads 4 bytes until it noticed that this has failed. After the failure it doesn't reposition. So this is displayed as "Check ·Date" instead of "Check \-up Date", i.e. input is lost. The "·" is the default glyph.
> The solution is to remember the position and to reposition there. I'm using mark() and reset() which, surprisingly, works both when loading in memory and when loading with temp file.



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