Hi PoDoFo supporters,
Thanks for all your contribution to the PoDoFo project. It's a very good
and useful open source project.
Our company has a project that should add custom attributes to PDF
file's Info dictionary. And we found some critical bugs of PoDoFo when
doing test on it.
1. There is a crash bug in function PdfPredictorDecoder::Decode() of
file PdfFiltersPrivate.cpp. You can test with pdf files that are
converted from .bmp or .jpg by Adobe Acrobat.
if( m_nCurRowIndex > m_nRows )
{
m_nCurRowIndex = 0;
m_nCurPredictor = m_nPredictor >= 10 ? *pBuffer + 10 :
*pBuffer;
}
else
{
...
case 12: // png up
m_pPrev[m_nCurRowIndex] += *pBuffer;
// Here m_nCurRowIndex may equal to m_nRows, and beyond the array
boundary.
pStream->Write( &m_pPrev[m_nCurRowIndex], 1 );
...
}
2. PoDoFo will failed to parse pdf file if there are some syntax error
in any dictionay.
For example, for the following data, there is string in ( ), and the
string contains two '('. PoDoFo will not parse the string correctly
until EOF of the file.
There are no bad syntax tolerance codes in the library. I think the
bugs should be fixed.
"... << ... /Title (....(..(hello world....) >> endobj ... "
3. If I open a pdf file (converted from .vsd file type) with PoDoFo, and
add some custom attributes into Info dictionary, and write the whole
back to a new pdf file.
Then the new generated file will generate many new dictionaries,
such as below data. And later if I add new custom attributes to the new
generated pdf file,
PoDoFo will parse the below data failed with "Invalid data type"
error message. (# is not a delimiter)
"100 0 obj << /C /# # # # # # # # ... /K ... >> endobj"
4. PoDoFo failed to parse PDF Portfolio file type with error message: No
trailer was found in the PDF file.
We will be appreciate if your team can fix these bugs in the new verson
of PoDoFo code. Thanks very much!
Regards,
-Derek
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