tree 7f287a165ff29dc797ab021df06b6887d3c9260e
parent cc2e579f61dca10133796193d92990030ca2fbb2
author Lei Zhang <thestig@chromium.org> 1625195521 +0000
committer Pdfium LUCI CQ <pdfium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1625195521 +0000

Get rid of redundant checks in ByteString::First() and Last().

These methods call Substr(), and Substr() performs the same check.
Last() performs a subtraction that can underflow, but the unsigned
underflow is well defined, and Substr() will still reject the bad
parameter.

Do the same for StringViewTemplate and WideString().

Change-Id: I1be3c4f426529cc1da13596f6800aabcc00b2cf9
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/82811
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>