tree df5c1ce27d6beae6f6ad544e73cc5b318c8a8137
parent 0004bd334b0c485b2e4ece0bfae8812c7f107a0d
author Lei Zhang <thestig@chromium.org> 1538416072 +0000
committer Lei Zhang <thestig@chromium.org> 1538416072 +0000

M70: Avoid CHECK in fpdf_parser_decode.cpp (memcpy empty span)

Given a span of size N, memcpy(dest, &span[N], 0) ought to be a no-op,
but since we compute span[N] before checking for zero length, we hit
an assert. The correct idiom should be to create a sub-span, which
allows specifying N, but only when the size is 0.

Bug: chromium:879910,chromium:889356
Change-Id: Ic6f368109a5c2f1e13a5f638c6a233769e2ad41b
Reviewed-on: https://pdfium-review.googlesource.com/41930
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
(cherry picked from commit 73e97f4fac2f4f591ff62e70377a80fd40b5f6f3)
Reviewed-on: https://pdfium-review.googlesource.com/43271