tree f80f62f7870b2b3c830a406ffdc3dc749edae6a8
parent b2ae83e8a2b0ed945f931338d6aa7e10ebb1fae0
author Lei Zhang <thestig@chromium.org> 1546983171 +0000
committer Chromium commit bot <commit-bot@chromium.org> 1546983171 +0000

Check inputs for CPDFSDK_CustomAccess::ReadBlockAtOffset().

To be consistent with other IFX_SeekableReadStream::ReadBlockAtOffset()
implementation. Do the same checks in similar code that reads from
FPDF_FILEACCESS.

With these checks, CPDF_Parser::ParseAndAppendCrossRefSubsectionData()
will consistently fail for xref tables with 0 entries. Check for this
case and make the parser succeed. This deals with the xref table quirk
more gracefully and avoids rebuilds. Update test expectations as a
result of this new behavior.

BUG=pdfium:1197

Change-Id: Id9900161c3453c37b51d501cb8746618388214a9
Reviewed-on: https://pdfium-review.googlesource.com/c/47551
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>