Details
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Type:
Bug
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Status: Closed
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: 3.0
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Fix Version/s: 3.1
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Component/s: Core/Parsing
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Labels:None
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Environment:ICEpdf 2.7.1
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Assignee Priority:P1
Description
java.lang.RuntimeException: LZWDecode failure
at ice.pdf.v.a(Unknown Source)
at ice.pdf.s.c(Unknown Source)
at ice.pdf.s.read(Unknown Source)
at ice.pdf.s.read(Unknown Source)
at ice.pdf.i.b(Unknown Source)
at ice.pdf.i.b(Unknown Source)
at ice.pdf.i.a(Unknown Source)
at ice.pdf.i.a(Unknown Source)
at ice.pdf.q.a(Unknown Source)
at ice.pdf.am.a(Unknown Source)
at ice.pdf.am.a(Unknown Source)
at com.icesoft.pdf.pobjects.Page.init(Unknown Source)
at ice.pdf.ak.run(Unknown Source)
at ice.pdf.cs.run(Unknown Source)
at java.lang.Thread.run(Thread.java:619)
Activity
| Field | Original Value | New Value |
|---|---|---|
| Attachment | ATLIS.pdf [ 11767 ] |
| Salesforce Case | [50070000008ntif] |
| Environment | All | ICEpdf 2.7.1 |
| Assignee | Patrick Corless [ patrick.corless ] | Mark Collette [ mark.collette ] |
| Fix Version/s | 3.1 [ 10181 ] | |
| Assignee Priority | P1 |
| Repository | Revision | Date | User | Message |
| ICEsoft Public SVN Repository | #19195 | Wed Aug 26 22:13:11 MDT 2009 | mark.collette | |
| Files Changed | ||||
MODIFY
/icepdf/trunk/icepdf/core/src/org/icepdf/core/pobjects/filters/LZWDecode.java
MODIFY
/icepdf/trunk/icepdf/core/src/org/icepdf/core/pobjects/Stream.java
|
Added support for LZWDecode's earlyChange decode parameter. Apparently there's an off-by-one difference in how two different typical LZW algorithms work. PDF works around this by including the earlyChange decode parameter, so that LZWDecode implementations can know which of the two algorithms to employ. The attached PDF exhibits the non-default value for this parameter, requiring support for the second algorithm, which we had not previously supported. Now we do.
Subversion 19195
core\src\org\icepdf\core\pobjects\filters\LZWDecode.java
core\src\org\icepdf\core\pobjects\Stream.java
| Status | Open [ 1 ] | Resolved [ 5 ] |
| Resolution | Fixed [ 1 ] |
It took a bit of effort to track down what earlyChange meant to the PDF specification, and how it generally affects the algorithm, and then apply that change to our implementation of the algorithm. I had to look at several LZW algorithms (at higher and lower levels) to understand what was going on, how things worked, and what needed to be done.
ICEpdf 3.1.0 has been released, closing issues.
| Status | Resolved [ 5 ] | Closed [ 6 ] |
Took a very quick look at the attached file. The header image is throwing the exception when reading the core images stream. I'll have to look closer but I suspect it is malformed or there is a stream start offset issue.
the error is also coming right out of core java, so it should be an interesting problem.