IFX Mail Archive: IFX> PDF question

IFX Mail Archive: IFX> PDF question

IFX> PDF question

From: John Pulera (jpulera@minolta-mil.com)
Date: Wed Jul 31 2002 - 22:33:50 EDT

  • Next message: Rick Seeler: "RE: IFX> RE: request for "PDFax" sample pdf"


    One of the requirements for IPPFAX is that the data format be
    "pseudo-streamable" so that a receiver would not have to parse the entire
    file before being able to render the first page. The group agreed that
    allowing random access for no more than a page worth of data at a time would
    be acceptable. However, in the sample JBIG-2 encoded pdf file you posted, it
    would seem that a parser would have to jump all the way to the end of the
    file to read the trailer dictionary first so that it can accurately
    interpret all the indirect objects at the front of the file. In section
    3.4.4 of the PDF Reference, it even states, "Applications should read a PDF
    file from its end."

    Is it possible for a parser to still accurately interpret the page &
    resource objects without having first traversed the file trailer and catalog
    dictionary? Or would linearized PDF be the only other feasible alternative?


    John Pulera

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