Consider overflow in is_orientation_marker

Bug: skia:7404

Use a uint64_t to store the four byte integer in order to protect
against overflow in the encoded (untrusted) offset.

Change-Id: I9592983a7a5353219507b7ec85eae2f2c4a16a1a
Reviewed-on: https://skia-review.googlesource.com/85900
Commit-Queue: Leon Scroggins <scroggo@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
1 file changed