Check if image width or height are zero before proceeding.

Check if image width or height are zero before proceeding.

If the width of the CJBig2_Image is set to 0 then the stride_pixels will be
zero and when we divide we'll get a floating point exception.

If the width or height are zero then we can exit early without proceeding with
the rest of the constructor.

BUG=chromium:635008
Committed: https://pdfium.googlesource.com/pdfium/+/b1b8668ef12ae4e7fcb5fbf3f01fa623a319a092

[dsinclair, 2016-08-08 17:50:34]

The CQ bit was checked by dsinclair@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-08 17:50:45]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[dsinclair, 2016-08-08 17:51:26]

dsinclair@chromium.org changed reviewers:
+ thestig@chromium.org, tsepez@chromium.org

[dsinclair, 2016-08-08 17:51:27]

PTAL.

Tom, this seems to better match the check that was in the original code as it
was doing <= for both width and height.

[Tom Sepez, 2016-08-08 17:56:21]

lgtm

[dsinclair, 2016-08-08 17:57:09]

The CQ bit was unchecked by dsinclair@chromium.org

[dsinclair, 2016-08-08 17:57:09]

The CQ bit was checked by dsinclair@chromium.org

[commit-bot: I haz the power, 2016-08-08 17:57:17]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-08 18:10:51]

Description was changed from

==========
Check if image width or height are zero before proceeding.

If the width of the CJBig2_Image is set to 0 then the stride_pixels will be
zero and when we divide we'll get a floating point exception.

If the width or height are zero then we can exit early without proceeding with
the rest of the constructor.

BUG=chromium:635008
==========

to

==========
Check if image width or height are zero before proceeding.

If the width of the CJBig2_Image is set to 0 then the stride_pixels will be
zero and when we divide we'll get a floating point exception.

If the width or height are zero then we can exit early without proceeding with
the rest of the constructor.

BUG=chromium:635008

Committed:
https://pdfium.googlesource.com/pdfium/+/b1b8668ef12ae4e7fcb5fbf3f01fa623a319...
==========

[commit-bot: I haz the power, 2016-08-08 18:10:52]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/b1b8668ef12ae4e7fcb5fbf3f01fa623a319...