#4825: extract worksheets embedded in pdf files
---------------------------+------------------------------------------------
Reporter: jason | Owner: boothby
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.3
Component: notebook | Keywords:
Work_issues: | Author:
Upstream: N/A | Reviewer:
Merged: |
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Changes (by jason):
* upstream: => N/A
Old description:
> This is an ongoing discussion on sage-devel right now.
>
> Basically, we'd like to embed an sws file in a pdf and then be able to
> upload the pdf file to the notebook and have the notebook automatically
> extract the sws file and create the worksheet.
>
> We can use pdfminer to extract the data. Here's a sample program which
> extracts the first embedded file in a pdf named 'foo.pdf'.
>
> {{{
> from pdflib.pdfparser import PDFDocument, PDFParser
> import sys
> stdout = sys.stdout
>
> doc = PDFDocument()
> fp = file('foo.pdf', 'rb')
> parser = PDFParser(doc, fp)
> doc.initialize()
>
> for xref in doc.xrefs:
> for objid in xref.objids():
> try:
> obj = doc.getobj(objid)
> except:
> continue
> if isinstance(obj,dict) and 'Type' in obj and obj['Type'].name ==
> "Annot":
> if 'Subtype' in obj and obj['Subtype'].name ==
> "FileAttachment":
> # We have an attached file!
> filespec = obj['FS']
> # Look for embedded file; we could try to extract the
> # filename too (and make sure it's an sws file). but that
> is platform dependent. See page
> # 182 (Section 3.10.2) of
> #
> http://www.adobe.com/devnet/acrobat/pdfs/pdf_reference_1-7.pdf.
> if 'EF' in filespec:
> fileobj = filespec['EF']['F']
> embeddedspec = filespec['EF']
> stdout.write(fileobj.resolve().get_data())
> # Just output the first file found.
> exit()
> }}}
New description:
This is an ongoing discussion on sage-devel right now:
http://groups.google.com/group/sage-
devel/browse_frm/thread/65a932ea328b1afb/91ced495a0a1c27a
Basically, we'd like to embed an sws file in a pdf and then be able to
upload the pdf file to the notebook and have the notebook automatically
extract the sws file and create the worksheet.
We can use pdfminer to extract the data. Here's a sample program which
extracts the first embedded file in a pdf named 'foo.pdf'.
{{{
from pdflib.pdfparser import PDFDocument, PDFParser
import sys
stdout = sys.stdout
doc = PDFDocument()
fp = file('foo.pdf', 'rb')
parser = PDFParser(doc, fp)
doc.initialize()
for xref in doc.xrefs:
for objid in xref.objids():
try:
obj = doc.getobj(objid)
except:
continue
if isinstance(obj,dict) and 'Type' in obj and obj['Type'].name ==
"Annot":
if 'Subtype' in obj and obj['Subtype'].name ==
"FileAttachment":
# We have an attached file!
filespec = obj['FS']
# Look for embedded file; we could try to extract the
# filename too (and make sure it's an sws file). but that
is platform dependent. See page
# 182 (Section 3.10.2) of
#
http://www.adobe.com/devnet/acrobat/pdfs/pdf_reference_1-7.pdf.
if 'EF' in filespec:
fileobj = filespec['EF']['F']
embeddedspec = filespec['EF']
stdout.write(fileobj.resolve().get_data())
# Just output the first file found.
exit()
}}}
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4825#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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