This allows the author to create access permissions that are supposed to be honored by a reader including: If there is no copy option, chances are it is encrypted with an owner password and no user password. Crypt (which could be one of several different algorithms)Īnd (surprise, surprise) any of these methods could also be layered on top of each other!.
PDFEXTRACTOR EMAIL ADRESS CODE PDF
Streams in PDF need not be encoded with flate. or perhaps its just not very difficult.ĮDIT: Just found that A-pdf also converted to text without problems. So either zamzar has some super-duper decrypting system.
Int rst2 = inflate (&zstrm, Z_FINISH) // HERE IT RETURNS -3ĮDIT: I tested text extraction from the "encrypted" pdf via an online pdf-to-text converter called zamzar, and the resulting text file was perfect. Zstrm.next_in = (Bytef*)(buffer + streamstart) Zstrm.avail_in = streamend - streamstart + 1 Z_stream zstrm ZeroMemory(&zstrm, sizeof(zstrm)) and if it is, is there a way around the problem?Ĭode snippet below - see comments //Now use zlib to inflate: Could this be related to the inflate() error?. I noticed that, the pdf file that fails, is set so that when opened in Adobe reader, there is no "copy" option. The code works perfectly on one sample pdf document, but on another it appears that the zlib's inflate() function returns -3 (Z_DATA_ERROR) every time it is called. The code employs the zlib library.ĪFAICT the program works by finding blocks of memory between occurrences of the text "stream" and "endstream" in the pdf file. I am attempting to extract text from a PDF file using the code found here.
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