Hello,
I am not sure whether this question has been posted before; I have done some
search in the mailing lists archives but found nothing...
We have big problems when applying more than one digital signatures to a
moderately large PDF document (say, more than a few MB). Starting from the
second one, each subsequent signature is done over a *revision*, which can
only be obtained as an InputStream.
Unfortunately, when a PdfReader is instantiated from an InputStream it reads
it all in memory (we have checked this in the sources, to be sure),
consuming *huge amounts* of virtual memory (especially when the document is
a highly structured one), which eventually causes the application (and the
PC) to hang.
Sadly, a RandomAccessFile - which I know to be the only efficient
alternative - cannot be costructed from an InputStream; so
a RandomAccessFile can only be used when doing the first (top level)
signature, but not when the subsequent signatures are to be applied, because
they are applied to revisions...
Is there a way to avoid such a severe memory problem when signing a
revision?
TIA to all volunteers,
defacto
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