/usr/share/pyshared/pdfrw/pdfwriter.py is in python-pdfrw 0+svn136-3.
This file is owned by root:root, with mode 0o644.
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# A part of pdfrw (pdfrw.googlecode.com)
# Copyright (C) 2006-2009 Patrick Maupin, Austin, Texas
# MIT license -- See LICENSE.txt for details
'''
The PdfWriter class writes an entire PDF file out to disk.
The writing process is not at all optimized or organized.
An instance of the PdfWriter class has two methods:
addpage(page)
and
write(fname)
addpage() assumes that the pages are part of a valid
tree/forest of PDF objects.
'''
try:
set
except NameError:
from sets import Set as set
from pdfobjects import PdfName, PdfArray, PdfDict, IndirectPdfDict, PdfObject, PdfString
from pdfcompress import compress
debug = False
class FormatObjects(object):
''' FormatObjects performs the actual formatting and disk write.
'''
def add(self, obj, visited):
''' Add an object to our list, if it's an indirect
object. Just format it if not.
'''
# Can't hash dicts, so just hash the object ID
objid = id(obj)
# Automatically set stream objects to indirect
if isinstance(obj, PdfDict):
indirect = obj.indirect or (obj.stream is not None)
else:
indirect = getattr(obj, 'indirect', False)
if not indirect:
assert objid not in visited, \
'Circular reference encountered in non-indirect object %s' % repr(obj)
visited.add(objid)
result = self.format_obj(obj, visited)
visited.remove(objid)
return result
objnum = self.indirect_dict.get(objid)
# If we haven't seen the object yet, we need to
# add it to the indirect object list.
if objnum is None:
objlist = self.objlist
objnum = len(objlist) + 1
if debug:
print ' Object', objnum, '\r',
objlist.append(None)
self.indirect_dict[objid] = objnum
objlist[objnum-1] = self.format_obj(obj)
return '%s 0 R' % objnum
def format_array(myarray, formatter):
# Format array data into semi-readable ASCII
if sum([len(x) for x in myarray]) <= 70:
return formatter % ' '.join(myarray)
bigarray = []
count = 1000000
for x in myarray:
lenx = len(x)
if lenx + count > 70:
subarray = []
bigarray.append(subarray)
count = 0
count += lenx + 1
subarray.append(x)
return formatter % '\n '.join([' '.join(x) for x in bigarray])
format_array = staticmethod(format_array)
def format_obj(self, obj, visited=None):
''' format PDF object data into semi-readable ASCII.
May mutually recurse with add() -- add() will
return references for indirect objects, and add
the indirect object to the list.
'''
if visited is None:
visited = set()
if isinstance(obj, PdfArray):
myarray = [self.add(x, visited) for x in obj]
return self.format_array(myarray, '[%s]')
elif isinstance(obj, PdfDict):
if self.compress and obj.stream:
compress([obj])
myarray = []
# Jython 2.2.1 has a bug which segfaults when
# sorting subclassed strings, so we un-subclass them.
dictkeys = [str(x) for x in obj.iterkeys()]
dictkeys.sort()
for key in dictkeys:
myarray.append(key)
myarray.append(self.add(obj[key], visited))
result = self.format_array(myarray, '<<%s>>')
stream = obj.stream
if stream is not None:
result = '%s\nstream\n%s\nendstream' % (result, stream)
return result
elif isinstance(obj, basestring) and not hasattr(obj, 'indirect'):
return PdfString.encode(obj)
else:
return str(obj)
def dump(cls, f, trailer, version='1.3', compress=True):
self = cls()
self.compress = compress
self.indirect_dict = {}
self.objlist = []
# The first format of trailer gets all the information,
# but we throw away the actual trailer formatting.
self.format_obj(trailer)
# Now we know the size, so we update the trailer dict
# and get the formatted data.
trailer.Size = PdfObject(len(self.objlist) + 1)
trailer = self.format_obj(trailer)
# Now we have all the pieces to write out to the file.
# Keep careful track of the counts while we do it so
# we can correctly build the cross-reference.
header = '%%PDF-%s\n%%\xe2\xe3\xcf\xd3\n' % version
f.write(header)
offset = len(header)
offsets = [(0, 65535, 'f')]
for i, x in enumerate(self.objlist):
objstr = '%s 0 obj\n%s\nendobj\n' % (i + 1, x)
offsets.append((offset, 0, 'n'))
offset += len(objstr)
f.write(objstr)
f.write('xref\n0 %s\n' % len(offsets))
for x in offsets:
f.write('%010d %05d %s\r\n' % x)
f.write('trailer\n\n%s\nstartxref\n%s\n%%%%EOF\n' % (trailer, offset))
dump = classmethod(dump)
class PdfWriter(object):
_trailer = None
def __init__(self, version='1.3', compress=True):
self.pagearray = PdfArray()
self.compress = compress
self.version = version
def addpage(self, page):
self._trailer = None
assert page.Type == PdfName.Page
inheritable = page.inheritable # searches for resources
self.pagearray.append(
IndirectPdfDict(
page,
Resources = inheritable.Resources,
MediaBox = inheritable.MediaBox,
CropBox = inheritable.CropBox,
Rotate = inheritable.Rotate,
)
)
return self
addPage = addpage # for compatibility with pyPdf
def addpages(self, pagelist):
for page in pagelist:
self.addpage(page)
return self
def _get_trailer(self):
trailer = self._trailer
if trailer is not None:
return trailer
# Create the basic object structure of the PDF file
trailer = PdfDict(
Root = IndirectPdfDict(
Type = PdfName.Catalog,
Pages = IndirectPdfDict(
Type = PdfName.Pages,
Count = PdfObject(len(self.pagearray)),
Kids = self.pagearray
)
)
)
# Make all the pages point back to the page dictionary
pagedict = trailer.Root.Pages
for page in pagedict.Kids:
page.Parent = pagedict
self._trailer = trailer
return trailer
def _set_trailer(self, trailer):
self._trailer = trailer
trailer = property(_get_trailer, _set_trailer)
def write(self, fname, trailer=None):
trailer = trailer or self.trailer
# Dump the data. We either have a filename or a preexisting
# file object.
preexisting = hasattr(fname, 'write')
f = preexisting and fname or open(fname, 'wb')
FormatObjects.dump(f, trailer, self.version, self.compress)
if not preexisting:
f.close()
if __name__ == '__main__':
debug = True
import pdfreader
x = pdfreader.PdfReader('source.pdf')
y = PdfWriter()
for i, page in enumerate(x.pages):
print ' Adding page', i+1, '\r',
y.addpage(page)
print
y.write('result.pdf')
print
|