tree e9591b77dda9aed418bf6fb299f616b7e409d9b3
parent 6d12d80ae363f47e14cbb830757f91f7c8513dab
author Lei Zhang <thestig@chromium.org> 1537565378 +0000
committer Lei Zhang <thestig@chromium.org> 1537565378 +0000

M70: Validate decoder pipelines.

PDF decoders, AKA filters, can be chained together. There can be
an arbitrary number of decoding / decompressing filters in the pipeline,
but there should be at most 1 image decoder, and the image decoder
should only be at the end of the chain.

BUG=chromium:880675
TBR=tsepez@chromium.org

Change-Id: Iffa27c70ec1ed7574e38e0de23413840ee900959
Reviewed-on: https://pdfium-review.googlesource.com/42711
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
(cherry picked from commit 5f2ea0f6ef587f9f7a2fec9f80dbc82b94c97400)
Reviewed-on: https://pdfium-review.googlesource.com/42970
Reviewed-by: Lei Zhang <thestig@chromium.org>