ICEpdf
  1. ICEpdf
  2. PDF-1171

Xref error and linear traversal failure.

          Details

          • Type: Bug Bug
          • Status: Closed
          • Priority: Major Major
          • Resolution: Fixed
          • Affects Version/s: 6.2.4
          • Fix Version/s: 6.2.5
          • Component/s: Core/Parsing
          • Labels:
            None
          • Environment:
            any

            Description

            I haven't seen such a malformed file in quite some time. The file is completely missing it's xref table or equivalent. Normally in such a case we do a linear traversal of the file indexing the found objects. But what looks to be happening is that there is a large xml section that isn't compressed which is causing our object parser some grief.

            Even the new object parser code I've been working on chokes on this file. Further analysis is needed.

              Activity

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              Patrick Corless created issue -
              Judy Guglielmin made changes -
              Field Original Value New Value
              Support Case References Support Case 14146:- https://icesoft.my.salesforce.com/5007000001kvPEn
              Patrick Corless made changes -
              Fix Version/s 6.2.5 [ 13102 ]
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              Patrick Corless added a comment -

              Further testing and digging around has shown the PDF has xref table but it is compressed. The actual bug is how we handle the predictor value associated with decompression using flateDecode. Typically the predictor value is only associated with png or tiff images streams. However as this PDF shows it perfectly valid for any data.

              The bug is because we derive the buffer size from an images number of columns, bits per color and number of components. When dealing with none image streams there values resulted in a zero buffer size and a failure to read the xref table. Adding default values correctly the problem ant he PDF renderings correctly.

              Show
              Patrick Corless added a comment - Further testing and digging around has shown the PDF has xref table but it is compressed. The actual bug is how we handle the predictor value associated with decompression using flateDecode. Typically the predictor value is only associated with png or tiff images streams. However as this PDF shows it perfectly valid for any data. The bug is because we derive the buffer size from an images number of columns, bits per color and number of components. When dealing with none image streams there values resulted in a zero buffer size and a failure to read the xref table. Adding default values correctly the problem ant he PDF renderings correctly.
              Hide
              Permalink
              Patrick Corless added a comment -

              Marking as fixed.

              Show
              Patrick Corless added a comment - Marking as fixed.
              Patrick Corless made changes -
              Status Open [ 1 ] Resolved [ 5 ]
              Resolution Fixed [ 1 ]
              Repository Revision Date User Message
              ICEsoft Public SVN Repository #51760 Tue Jul 18 13:29:14 MDT 2017 patrick.corless PDF-1171 fixed zero buffer size when working with none image stream
              that has a predictor value.
              Files Changed
              Commit graph MODIFY /icepdf/branches/icepdf-6.2.0/icepdf/core/src/org/icepdf/core/pobjects/filters/PredictorDecode.java
              Commit graph MODIFY /icepdf/branches/icepdf-6.2.0/icepdf/core/src/org/icepdf/core/util/Parser.java
              Commit graph MODIFY /icepdf/branches/icepdf-6.2.0/icepdf/core/src/org/icepdf/core/pobjects/Document.java
              Commit graph MODIFY /icepdf/branches/icepdf-6.2.0/icepdf/core/src/org/icepdf/core/pobjects/filters/FlateDecode.java
              Repository Revision Date User Message
              ICEsoft Public SVN Repository #51801 Mon Jul 31 13:35:05 MDT 2017 patrick.corless PDF-1171 fixed zero buffer size when working with none image stream
              that has a predictor value.
              Files Changed
              Commit graph MODIFY /icepdf/trunk/icepdf/core/core-awt/src/main/java/org/icepdf/core/pobjects/filters/FlateDecode.java
              Commit graph MODIFY /icepdf/trunk/icepdf/core/core-awt/src/main/java/org/icepdf/core/util/Parser.java
              Commit graph MODIFY /icepdf/trunk/icepdf/core/core-awt/src/main/java/org/icepdf/core/pobjects/Document.java
              Commit graph MODIFY /icepdf/trunk/icepdf/core/core-awt/src/main/java/org/icepdf/core/pobjects/filters/PredictorDecode.java
              Patrick Corless made changes -
              Status Resolved [ 5 ] Closed [ 6 ]

                People

                • Assignee:
                  Patrick Corless
                  Reporter:
                  Patrick Corless
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                  Dates

                  • Created:
                    Updated:
                    Resolved: