Since PDF version 1.5, a document may omit the xref table in favor of
a new kind of xref stream object. This is used to reference so-called
"compressed" objects that are part of an object stream.
With this patch we are able to parse this new kind of xref object, but
we'll have to implement object streams to use them correctly.
Security handlers manage encryption and decription of PDF files. The
standard security handler uses RC4/MD5 to perform its crypto (AES as
well, but that is not yet implemented).
This is a big step, as most PDFs which are downloaded online will be
linearized. Pretty much the only difference is that the xref structure
is slightly different.
