BaseParser incorrectly handling stream, exhibiting IOException
--------------------------------------------------------------
Key: PDFBOX-383
URL: https://issues.apache.org/jira/browse/PDFBOX-383
Project: PDFBox
Issue Type: Bug
Components: Parsing
Affects Versions: 0.7.3
Environment: pdfbox 0.73 with java 5 running on windows platform
Reporter: Son
when loading pdf file containing a file attachment annotation , errors might
occurs when 2 conditions arise:
- the Length value for the dictionary of F stream holds an indirect reference
to a integer value
- the content of the filtered stream contains the word 'endstream'
typically this occurs when, in the pdf file, there is a stream description as
follows:
12 0 obj
<< /Length 16 0 R
/Filter /FlateDecode
>>
stream
{content}
endstream
endobj
...
16 0 obj
{length}
endobj
....
and it the {content} (filtered) contains the (filtered) string "endstream".
(see on line 3700 of the attachment)
the problem is related to the way stream content is (always) read by method
readUntilEndStream () that stop on first 'endstream' sequence end.
a (partial) fix was made, that reads the stream content 3 different ways:
- if the Length is known (this is a direct object), the {length} bytes are read
and written to the stream FilteredStream
- if the Length is unknown and if the filter is FlateFilter, the code unfilters
the datas (the FlateDecode algorythm allows for not knowing the length of
encoded data ahead of time) and associates to the stream's unfiltered stream
- otherwise, let current behavior
Running the modified code on files exhibiting errors has fixed problems that
was encountered.
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