Structure of a PDF file? How to read pdf parse for question ‘Structure of a PDF file?
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3A8 8 0 0 0 1. 77 0 0 1 4. I’d like to use python to do this and I’ve found several libraries that are capable of doing what I want in some ways. But now after a few researches, I’m wondering what is the real structure of a pdf file, does anyone know if there is a spec or some explanations anywhere online?
Use comments to ask for more information or suggest improvements. Avoid answering questions in comments. You should know though that PDF is only about presentation, not structure. Parsing will not come easy. Ok Greant the link is ok now When I did my researches I wasn’t able to download the last reference.
It might help you to know that the overview of the file structure is found in syntax, and what Adobe call the document structure is the object structure and not the file structure. That is also found in Syntax. The description of operators is hidden away in Appendix A – very useful for understanding what is happening in content streams. If you ever have the pain of working with colour spaces you will find that hidden in Graphics!
Hopefully these pointers will help you find things more quickly than I did. There is a free demo available that allows you to examine the file but not save it. The same PDF is accepted by other programs. I fixed them with webarchive links for posterity. The raw reference seems pointless. It contains only a single page? I’m trying to do pretty much the same thing.
The PDF reference is a very difficult document to read. A PDF document is a data structure composed from a small set of basic types of data objects. 3, “Objects,” describes the syntax and essential properties of the objects. This structure is independent of the semantics of the objects. 5, “File Structure,” describes the file structure.
PDF document: pages, fonts, annotations, and so forth. 8, “Content Streams and Resources,” discusses PDF content streams and their associated resources. Looks like navigating a PDF file will require a little more than a passing effort. Extracting text from PDF is a hard problem because PDF has such a layout-oriented structure. The PDF data structure is very cool and well designed, but it’s easier to write than read. This is the best library to parse PDF files till date. 2txt -t html -d -Y exact -o foo.