Adomas Birštunas created PDFBOX-4925:
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Summary: Invalid stream Length validation in
StreamValidationProcess
Key: PDFBOX-4925
URL: https://issues.apache.org/jira/browse/PDFBOX-4925
Project: PDFBox
Issue Type: Bug
Components: Preflight
Affects Versions: 2.0.19
Reporter: Adomas Birštunas
Attachments: PdfWithEmbeddedFileStream.pdf,
StreamValidationProcessFixedBug.java
org.apache.pdfbox.preflight.process.StreamValidationProcess Length of the
stream validation is invalid.
If Stream dictionray contains "\nstream", it find wrong stream start position.
Therefore, it reports an error for the wrong stream length, despite stream
length is correct.
PdfWithEmbeddedFileStream.pdf - is an example of PDF containing stream for
embedded file stream, which raises an error
"ERROR_SYNTAX_STREAM_LENGTH_INVALID: Body Syntax error, Stream length is
invalid [cObj=COSObject\{18, 0}; defined length=372; buffer2= V6 t ".
The problem was caused by the "/Subtype /application#2Foctet-stream" which
contains "stream\n".
Trying to find stream start position it is not enough to search for the
"stream".
As a fix I suggest first to skip dictionary bytes.
The fixing code may be find in StreamValidationProcessFixedBug.java.
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