tree 0533921e1f06ee7ee173ea5b1a957a0d4659b3ef
parent 1f088ab877cbbca8ed383e327e1460ae08eb6cb0
author Lei Zhang <thestig@chromium.org> 1571752096 +0000
committer Lei Zhang <thestig@chromium.org> 1571752096 +0000

M79: Verify font resource dictionaries.

Font dictionaries are required to have a /Type /Font entry, and font
resource dictionaries should be made up of valid font dictionaries.
Verify this in places that use font resource dictionaries, to prevent
accidentally treating other objects as font resource dictionaries.

Add ValidateDictType() and ValidateResourceDict() helper functions, with
unit tests, to do this validation.

TBR=dsinclair@chromium.org
Bug: chromium:1013868
Change-Id: I6ae2b60d35ea396f47cd5a9c80e8f138ef9d264b
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/61450
Commit-Queue: Lei Zhang <thestig@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Chris Palmer <palmer@chromium.org>
(cherry picked from commit 94e600d98301661502135a89db1fb0cc7caae5e9)
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/61630
Reviewed-by: Lei Zhang <thestig@chromium.org>