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This CL fixes the only caller to TIFFReadDirEntryData with potentially large
size so that we avoid big mallocs when we know we will fail. It does this as
follows:
- Avoid the unnecessary computations if datasize is very small. We don't want
to be slower in this case.
- If !isMapped(tif), we will Seek and Read. Check that ending position is
reachable. In the other case, do a simple check for out of bounds.
Bug: chromium:681311
Change-Id: Ia172d8b4d401753b7c8d5455dc1ada5335f6fa6b
Reviewed-on: https://pdfium-review.googlesource.com/3253
Commit-Queue: Nicolás Peña <npm@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
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