What are streams in PDF?
A page in a PDF document has one or more content stream parts that together contain all the PDF page description commands for the page. So content streams are essentially the contents of the pages – the text and any line drawings.
What is Startxref in PDF?
The startxref tells the PDF viewer the byte offset of the most recent xref .
What is Procset in PDF?
Class: PDF::Writer::Object::Procset The document Procedure Set. These procedure sets are used only when the content stream is printed to a PostScript output device; the names identify PostScript procedure sets that must be sent to the device to interpret the PDF operators in the content stream.
What is trailer in PDF?
The trailer of a PDF file enables a conforming reader to quickly find the cross-reference table and certain special objects. Conforming readers should read a PDF file from its end. The last line of the file shall contain only the end-of-file marker, %%EOF.
What is Obj PDF?
OBJ files are used by Wavefront’s Advanced Visualizer application to define and store the geometric objects. Backward and forward transmission of geometric data is made possible through OBJ files.
How do I decode a stream in PDF?
The easiest way to decode a PDF file is to use a tool intended to do it, for example MuPDF can do this with ” mutool clean -d ” will decompress ( -d ) all the compressed streams in a PDF file and write the output to a new PDF file.
What is flat decode?
This means that the stream following the filter is double filtered with FlateDecode. So when something is filtered twice with the same filter we decompress them twice to get the data. Once you have done that you can feed the stream file in the python script to get the decompressed data.
How are PDFs coded?
PDF files are either 8-bit binary files or 7-bit ASCII text files (using ASCII-85 encoding). Every line ends with a carriage return, a line feed or a carriage return followed by a line feed (depending upon the application or platform used to create the PDF file). PDF is case sensitive.
What is FlateDecode PDF?
FlateDecode is a commonly used filter based on the DEFLATE or Zip algorithm. A particular stream in the PDF file can be filtered multiple times with multiple filters, some of them being ASCII85Decode, ASCIIHexDecode, etc.