tree c403d87e59f9f63fb2ff8aeacdd8140805a6cf64
parent b93ec9bf15bbab33c46f7c1296f11965dbb15836
author Lei Zhang <thestig@chromium.org> 1572377868 +0000
committer Lei Zhang <thestig@chromium.org> 1572377868 +0000

M78: 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.

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/+/61690
Reviewed-by: Lei Zhang <thestig@chromium.org>