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https://issues.apache.org/jira/browse/PDFBOX-424?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Schlegel updated PDFBOX-424:
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Description:
Sometimes it can happens that decoding of streams can hang up.
The reason can be find in org.apache.pdfbox.filter.FlateFilter decode method.
Here you ask for available datas in the compressedData stream:
decompressor = new InflaterInputStream(compressedData);
int mayRead = compressedData.available();
byte[] buffer = new byte[Math.min(mayRead, BUFFER_SIZE)];
Sometimes compressedData.available() returns 0.
Later you iterate over stream datas.
while((amountRead = decompressor.read(buffer, 0, Math.min(mayRead,
BUFFER_SIZE))) != -1 )
{
result.write(buffer, 0, amountRead);
}
Because mayRead is 0 with every loop you try to read 0 bytes from stream ==>
amountRead will be 0 for every loop ==> Loop nether finishes.
You can test this following PDF-Document:
http://www.usu.de/d/Case_Studies/BSM/Profiles_in_Excellence_FIDUCIA_AG.pdf
was:
Sometimes it can happens that decoding of streams can hang up.
The reason can be find in org.apache.pdfbox.filter.FlateFilter decode method.
Here you ask for available datas in the compressedData stream:
decompressor = new InflaterInputStream(compressedData);
int mayRead = compressedData.available();
byte[] buffer = new byte[Math.min(mayRead, BUFFER_SIZE)];
Sometimes compressedData.available() returns 0.
Later you iterate over stream datas.
while((amountRead = decompressor.read(buffer, 0, Main.min(mayRead,
BUFFER_SIZE))) != -1 )
{
result.write(buffer, 0, amountRead);
}
Because mayRead is 0 with every loop you try to read 0 bytes from stream ==>
amountRead will be 0 for every loop ==> Loop nether finishes.
You can test this following PDF-Document:
http://www.usu.de/d/Case_Studies/BSM/Profiles_in_Excellence_FIDUCIA_AG.pdf
> Stream decoding hangs up
> ------------------------
>
> Key: PDFBOX-424
> URL: https://issues.apache.org/jira/browse/PDFBOX-424
> Project: PDFBox
> Issue Type: Bug
> Components: Parsing
> Reporter: Michael Schlegel
>
> Sometimes it can happens that decoding of streams can hang up.
> The reason can be find in org.apache.pdfbox.filter.FlateFilter decode method.
> Here you ask for available datas in the compressedData stream:
> decompressor = new InflaterInputStream(compressedData);
> int mayRead = compressedData.available();
> byte[] buffer = new byte[Math.min(mayRead, BUFFER_SIZE)];
> Sometimes compressedData.available() returns 0.
> Later you iterate over stream datas.
> while((amountRead = decompressor.read(buffer, 0, Math.min(mayRead,
> BUFFER_SIZE))) != -1 )
> {
> result.write(buffer, 0, amountRead);
> }
> Because mayRead is 0 with every loop you try to read 0 bytes from stream ==>
> amountRead will be 0 for every loop ==> Loop nether finishes.
> You can test this following PDF-Document:
> http://www.usu.de/d/Case_Studies/BSM/Profiles_in_Excellence_FIDUCIA_AG.pdf
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