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https://issues.apache.org/jira/browse/IMAGING-162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14330330#comment-14330330
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Michael Groß commented on IMAGING-162:
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The proposed fix doesn't break anything for RLE-compressed BMP images.
Added+executed test cases for this.
But I am still not sure what it does if an RLE-compressed BMP image with
negative height is given because I have no example yet. (I expect the image to
be read top-down = turned by 180°.) Are RLE-compressed BMP image with negative
height eve somethig which appears somewhere in the wild? But this patch
improves the existing code.
[~mgolub] Could you provide an example?
> BMP files with negative bitmap height are not supported
> -------------------------------------------------------
>
> Key: IMAGING-162
> URL: https://issues.apache.org/jira/browse/IMAGING-162
> Project: Commons Imaging
> Issue Type: Bug
> Components: Format: BMP
> Affects Versions: 1.0
> Reporter: Myroslav Golub
> Labels: github
> Fix For: Review Patch
>
> Attachments: monochrome-negative-height.bmp
>
>
> The BMP format allows for negative values of the height field in the header.
> This means that the image lines are stored top-down, not bottom-up as usual
> (i. e. the first pixel in the pixel array would be in the top left corner of
> the image, not in the bottom left as usual). However, when a negative-height
> bitmap is passed, the BmpImageParser attempts to create an array of negative
> length, and a NegativeArraySizeException ensues.
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