I realize that Podofo does not implement all Predictors. I just wanted to make double sure that this is the case with regards to the attached. PDF. I would like to explore the use of predictors further (I know it's probably quiet advanced) as I will run into this problem again. I am trying to decompress a single Xref Stream in the attached PDF document. The code I have provided below can decode any chosen FlateDecode stream but when I include DecodeParms for a stream encoded using DecodeParms such as the Xref stream in Object 15 0 obj I just get jumbled output. I know I've been through this but I'm hoping someone can take a look at this. The Decode method is on line 60.The Object to select is on line 16.// you can change this and set the PdfDictionary variable dict on line 60 to NULL to see that this will decode other streams. I just can't get Xref Stream in 15 0 obj to decompress when I include DecodeParms. My code is pretty average but would someone mind taking a look. This is driving me mad.All I want to do is decompress the Xref Stream. Thanks
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#include <iostream>
#include <string>
#include <cstdlib>
#include <podofo/podofo.h>
using namespace PoDoFo;
using namespace std;
int main(int argc, char **argv)
{
PdfMemDocument doc;
doc.Load("test.pdf");
PdfReference *refs = new PdfReference(15,0);
PdfVecObjects ob = doc.GetObjects();
PdfObject *obj = ob.GetObject(*refs);
PdfStream *strm = obj->GetStream();
char* mms = new char;
pdf_long *ln = new pdf_long;
*ln = strm->GetLength();
strm->GetCopy(&mms,ln);
cout << "length: " << *ln << endl;
cout << endl << endl;
//PARMS
PdfDictionary &mydict = obj->GetDictionary();
//display dictionary
string mm;
obj->ToString(mm,ePdfWriteMode_Clean);
cout << endl << "THE DICTIONARY EXTRACTED: " << endl << endl << mm << endl << endl;
//declare variables for Filter->Decode method.
PdfDictionary *dict = &mydict;
pdf_long inputsize = *ln;
pdf_long *outputsize = new pdf_long;
char* inputbuffer = mms;
char* outputbuffer = new char;
// FILTERS
PdfFilterFactory Factory;
static std::auto_ptr<PdfFilter> myfilter;
myfilter = Factory.Create(ePdfFilter_FlateDecode);
myfilter->Decode(mms,inputsize,&outputbuffer,outputsize,dict);
cout << "Filtering Complete" << endl << endl;
cout << "output size: " << *outputsize << endl << endl;
cout << "THE OUTPUT IS BELOW: " << endl << endl;
for (int x = 0; x < *outputsize; x++)
{
cout << outputbuffer[x];
}
cout << endl << endl;
system("pause>null");
}
test.pdf
Description: Adobe PDF document
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