[gentoo-user] repair damaged pdf?

[Liviu Andronic <landronimirc@gmail.com>]

Dear all
What is your experience with corrupted PDF files? Do you know any tool
that can attempt to repair damaged PDF files? Does it make any sense
to edit a PDF file in hex mode?

I have a damaged PDF that cannot be opened with any of the about 10
tools that I've just tried.
liv@liv-laptop:/tmp$ pdf2ps Class\ 1.pdf
   **** Warning: File has a corrupted %%EOF marker, or garbage after %%EOF.
   **** Warning:  An error occurred while reading an XREF table.
   **** The file has been damaged.  This may have been caused
   **** by a problem while converting or transfering the file.
   **** Ghostscript will attempt to recover the data.
Error: /typecheck in --run--
Operand stack:
   --nostringval--   --nostringval--   1
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--
--nostringval--   2   %stopped_push   --nostringval--
--nostringval--   --nostringval--   false   1   %stopped_push   1878
1   3   %oparray_pop   1877   1   3   %oparray_pop   1861   1   3
%oparray_pop   --nostringval--   --nostringval--   --nostringval--
--nostringval--   --nostringval--   --nostringval--
Dictionary stack:
   --dict:1155/1684(ro)(G)--   --dict:1/20(G)--   --dict:75/200(L)--
--dict:75/200(L)--   --dict:108/127(ro)(G)--   --dict:288/300(ro)(G)--
  --dict:20/25(L)--   --dict:1/10(L)--
Current allocation mode is local
GPL Ghostscript 8.71: Unrecoverable error, exit code 1

liv@liv-laptop:/tmp$ pdftops Class\ 1.pdf
Error: PDF file is damaged - attempting to reconstruct xref table...
Error: Top-level pages object is wrong type (null)
Error: Couldn't read page catalog

Any ideas how I could try to repair it? (It's not sensitive and it's
small, so I could post it.) I tried pdftk, but it also fails.
liv@liv-laptop:/tmp$ pdftk Class\ 1.pdf output Class\ 11.pdf
java.lang.NullPointerException
   at com.lowagie.text.pdf.PdfReader$PageRefs.iteratePages(itext-2.1.7.jar.so)
   at com.lowagie.text.pdf.PdfReader$PageRefs.readPages(itext-2.1.7.jar.so)
   at com.lowagie.text.pdf.PdfReader$PageRefs.<init>(itext-2.1.7.jar.so)
   at com.lowagie.text.pdf.PdfReader$PageRefs.<init>(itext-2.1.7.jar.so)
   at com.lowagie.text.pdf.PdfReader.readPages(itext-2.1.7.jar.so)
   at com.lowagie.text.pdf.PdfReader.readPdf(itext-2.1.7.jar.so)
   at com.lowagie.text.pdf.PdfReader.<init>(itext-2.1.7.jar.so)
   at com.lowagie.text.pdf.PdfReader.<init>(itext-2.1.7.jar.so)
Error: Unexpected Exception in open_reader()
Error: Failed to open PDF file:
   Class 1.pdf
Errors encountered.  No output created.
Done.  Input errors, so no output created.

Regards
Liviu


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