Decrease XML parser buffer size

This CL decreases the m_iXMLPlaneSize in the CFX_XMLSyntaxParser from
32*1024 to 1024 bytes. This plane size is the size of the chunks we read
the XML file in. The issue with having a large plane size is inside the
CFX_SeekableStreamProxy::ReadString we allocate a vector of the
min(planeSize, remaining_bytes). This means, we could potentially be
allocating 32*1024 bytes to read in a single character.

For the test in the attached bug the runtime went from 12s to 25ms.

Bug: chromium:813195
Change-Id: Id57e619b7a118d45e3fed491ad81e86a4b1cacb8
Reviewed-on: https://pdfium-review.googlesource.com/29750
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

0 files changed, 0 insertions, 0 deletions