tree 12688ef2a12d77bf8acfbb63a9a2ef24c9460d55
parent 5a101b49dd29ba7608cbe5b515d5a0a4b04a19c2
author Nico Weber <thakis@chromium.org> 1753877728 -0700
committer Pdfium LUCI CQ <pdfium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1753877728 -0700

Fix integer overflow after recent change

https://pdfium-review.googlesource.com/c/pdfium/+/134090 changed this
code to used signed integers. But signed integer overflow isn't
defined.

Switch to int64_t. THe products are int32_t * uint16_t, and we add
two of those and one int32_t. This easily fits into an int64_t.

The first loop already naturally filters out very big and small
x and y values.

The second does too as long as we let CJBig2_Image::Compose*()
take int64_ts, so switch to that.

No intended behavior change, except for fuzzer (and fuzzer-like)
inputs.

Bug: 432691328
Change-Id: I22ee3bb5306409eb9a965f254d534a9dca9caa39
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/134470
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nico Weber <thakis@google.com>