On 2016-10-31 12:44 (-0400), Andreas Lehmkuehler <[email protected]> wrote: > Am 31.10.2016 um 16:10 schrieb [email protected]: > > > >>> OBJ_NUMBER , OFFSET > >>> 49,12769 > >>> 50,25217 > >>> 51,25502 > >>> 52,26034 > >>> 53,116 > >>> 54,-36 > >>> 55,-36 > >>> 56,-36 > > > >> A negative offset indicates that the given object is part of a compressed > >> object > >> stream. In your case that stream is object 36 0. > >> > >>> Thanks in advance for your time. > >> > >> BR > >> Andreas > > > > Thanks Andreas. Where can I find more documentation on compressed objects > > with respect to negative offsets? > PDF spec, chapter "7.5.7 Object Streams" > > BR > Andreas > > Thanks. I read that section. I also read about cross-reference streams. > Nowhere in the entire PDF Spec does it mention negative offsets. I'm > relatively new to pdf parsing and where I'm stumped is I don't know exactly > how to handle these negative offsets.
> >>> OBJ_NUMBER , OFFSET > >>> 49,12769 > >>> 50,25217 > >>> 51,25502 > >>> 52,26034 > >>> 53,116 > >>> 54,-36 > >>> 55,-36 > >>> 56,-36 Let's take Object Number 54 for example. In your answer you stated that this would be Object [36,0] and that it is compressed. How did you know it's object 36,0? Where did you find this information?How - using the PDFBox API, would I retrieve this object and decode it? I wish I could find documentation (somewhere) on how to handle this scenario - maybe I'm missing something or not searching for the right keywords. I appreciate your patience in helping me out. I'm more than willing to read/research anything necessary, but I just got through reading 3 sections of the PDF Reference and while it discussed at length the structure of objects, object streams, cross reference streams , it did not help me in dealing with how to handle/ locate / parse objects with a negative offset. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
