def addBookmark(self, title, pagenum, parent=None):
"""
Add a bookmark to the pdf, using the specified title and pointing at
the specified page number. A parent can be specified to make this a
nested bookmark below the parent.
"""
pageRef = self.getObject(self._pages)['/Kids'][pagenum]
action = DictionaryObject()
action.update({NameObject('/D'): ArrayObject([pageRef,
NameObject('/FitH'),
NumberObject(826)]),
NameObject('/S'): NameObject('/GoTo')})
actionRef = self._addObject(action)
outlineRef = self.getOutlineRoot()
if parent is None:
parent = outlineRef
bookmark = TreeObject()
bookmark.update({NameObject('/A'): actionRef,
NameObject('/Title'): createStringObject(title)})
bookmarkRef = self._addObject(bookmark)
parent = parent.getObject()
parent.addChild(bookmarkRef, self)
return bookmarkRef
def addBookmark(self, title, pagenum, parent=None):
"""
Add a bookmark to the pdf, using the specified title and pointing at
the specified page number. A parent can be specified to make this a
nested bookmark below the parent.
"""
pageRef = self.getObject(self._pages)['/Kids'][pagenum]
action = DictionaryObject()
action.update({
NameObject('/D'):
ArrayObject([pageRef,
NameObject('/FitH'),
NumberObject(826)]),
NameObject('/S'):
NameObject('/GoTo')
})
actionRef = self._addObject(action)
outlineRef = self.getOutlineRoot()
if parent is None:
parent = outlineRef
bookmark = TreeObject()
bookmark.update({
NameObject('/A'): actionRef,
NameObject('/Title'): createStringObject(title)
})
bookmarkRef = self._addObject(bookmark)
parent = parent.getObject()
parent.addChild(bookmarkRef, self)
return bookmarkRef
def getNamedDestRoot(self):
root = self.getObject(self._root)
if '/Names' in root and isinstance(root['/Names'], DictionaryObject):
names = root['/Names']
idnum = self._objects.index(names) + 1
namesRef = IndirectObject(idnum, 0, self)
assert namesRef.getObject() == names
if '/Dests' in names and isinstance(names['/Dests'],
DictionaryObject):
dests = names['/Dests']
idnum = self._objects.index(dests) + 1
destsRef = IndirectObject(idnum, 0, self)
assert destsRef.getObject() == dests
if '/Names' in dests:
nd = dests['/Names']
else:
nd = ArrayObject()
dests[NameObject('/Names')] = nd
else:
dests = DictionaryObject()
destsRef = self._addObject(dests)
names[NameObject('/Dests')] = destsRef
nd = ArrayObject()
dests[NameObject('/Names')] = nd
else:
names = DictionaryObject()
namesRef = self._addObject(names)
root[NameObject('/Names')] = namesRef
dests = DictionaryObject()
destsRef = self._addObject(dests)
names[NameObject('/Dests')] = destsRef
nd = ArrayObject()
dests[NameObject('/Names')] = nd
return nd
def addNamedDestination(self, title, pagenum):
pageRef = self.getObject(self._pages)['/Kids'][pagenum]
dest = DictionaryObject()
dest.update({NameObject('/D'): ArrayObject([pageRef,
NameObject('/FitH'),
NumberObject(826)]),
NameObject('/S'): NameObject('/GoTo')})
destRef = self._addObject(dest)
nd = self.getNamedDestRoot()
nd.extend([title, destRef])
return destRef
def add(self, title, pagenum):
pageRef = self.pdf.getObject(self.pdf._pages)['/Kids'][pagenum]
action = DictionaryObject()
action.update({NameObject('/D'): ArrayObject([pageRef,
NameObject('/FitH'),
NumberObject(826)]),
NameObject('/S'): NameObject('/GoTo')})
actionRef = self.pdf._addObject(action)
bookmark = TreeObject()
bookmark.update({NameObject('/A'): actionRef,
NameObject('/Title'): createStringObject(title)})
self.pdf._addObject(bookmark)
self.tree.addChild(bookmark)
def _mergeResources(res1, res2, resource):
newRes = DictionaryObject()
newRes.update(res1.get(resource, DictionaryObject()).getObject())
page2Res = res2.get(resource, DictionaryObject()).getObject()
renameRes = {}
for key in page2Res.keys():
if key in newRes and newRes[key] != page2Res[key]:
newname = NameObject(key + "renamed")
renameRes[key] = newname
newRes[newname] = page2Res[key]
elif key not in newRes:
newRes[key] = page2Res.raw_get(key)
return newRes, renameRes
def addNamedDestination(self, title, pagenum):
pageRef = self.getObject(self._pages)['/Kids'][pagenum]
dest = DictionaryObject()
dest.update({
NameObject('/D'):
ArrayObject([pageRef,
NameObject('/FitH'),
NumberObject(826)]),
NameObject('/S'):
NameObject('/GoTo')
})
destRef = self._addObject(dest)
nd = self.getNamedDestRoot()
nd.extend([title, destRef])
return destRef
def _readInlineImage(self, stream):
# begin reading just after the "BI" - begin image
# first read the dictionary of settings.
settings = DictionaryObject()
while True:
tok = readNonWhitespace(stream)
stream.seek(-1, 1)
if tok == "I":
# "ID" - begin of image data
break
key = readObject(stream, self.pdf)
tok = readNonWhitespace(stream)
stream.seek(-1, 1)
value = readObject(stream, self.pdf)
settings[key] = value
# left at beginning of ID
tmp = stream.read(3)
assert tmp[:2] == "ID"
data = ""
while True:
tok = stream.read(1)
if tok == "E":
next = stream.read(1)
if next == "I":
break
else:
stream.seek(-1, 1)
data += tok
else:
data += tok
readNonWhitespace(stream)
stream.seek(-1, 1)
return {"settings": settings, "data": data}
def __init__(self, title, page, typ, *args):
DictionaryObject.__init__(self)
self[NameObject("/Title")] = title
self[NameObject("/Page")] = page
self[NameObject("/Type")] = typ
# from table 8.2 of the PDF 1.6 reference.
if typ == "/XYZ":
(self[NameObject("/Left")], self[NameObject("/Top")],
self[NameObject("/Zoom")]) = args
elif typ == "/FitR":
(self[NameObject("/Left")], self[NameObject("/Bottom")],
self[NameObject("/Right")], self[NameObject("/Top")]) = args
elif typ in ["/FitH", "FitBH"]:
self[NameObject("/Top")], = args
elif typ in ["/FitV", "FitBV"]:
self[NameObject("/Left")], = args
elif typ in ["/Fit", "FitB"]:
pass
else:
raise utils.PdfReadError("Unknown Destination Type: %r" % typ)
def __init__(self):
self._header = b_("%PDF-1.3")
self._objects = [] # array of indirect objects
# The root of our page tree node.
pages = DictionaryObject()
pages.update({NameObject("/Type"): NameObject("/Pages"),
NameObject("/Count"): NumberObject(0),
NameObject("/Kids"): ArrayObject()})
self._pages = self._addObject(pages)
# info object
info = DictionaryObject()
info.update({NameObject("/Producer"): createStringObject(
u"Python PDF Library - http://pybrary.net/pyPdf/")})
self._info = self._addObject(info)
# root object
root = DictionaryObject()
root.update({NameObject("/Type"): NameObject("/Catalog"),
NameObject("/Pages"): self._pages})
self._root = self._addObject(root)
def addBookmarkDict(self, bookmark, parent=None):
bookmarkObj = TreeObject()
for k, v in bookmark.items():
bookmarkObj[NameObject(str(k))] = v
bookmarkObj.update(bookmark)
if '/A' in bookmark:
action = DictionaryObject()
for k, v in bookmark['/A'].items():
action[NameObject(str(k))] = v
actionRef = self._addObject(action)
bookmarkObj['/A'] = actionRef
bookmarkRef = self._addObject(bookmarkObj)
outlineRef = self.getOutlineRoot()
if parent is None:
parent = outlineRef
parent = parent.getObject()
parent.addChild(bookmarkRef, self)
return bookmarkRef
def createBlankPage(pdf=None, width=None, height=None):
page = PageObject(pdf)
# Creates a new page (cf PDF Reference 7.7.3.3)
page.__setitem__(NameObject('/Type'), NameObject('/Page'))
page.__setitem__(NameObject('/Parent'), NullObject())
page.__setitem__(NameObject('/Resources'), DictionaryObject())
if width is None or height is None:
if pdf is not None and pdf.getNumPages() > 0:
lastpage = pdf.getPage(pdf.getNumPages() - 1)
width = lastpage.mediaBox.getWidth()
height = lastpage.mediaBox.getHeight()
else:
raise utils.PageSizeNotDefinedError()
page.__setitem__(NameObject('/MediaBox'),
RectangleObject([0, 0, width, height]))
return page
def _mergeResources(res1, res2, resource):
newRes = DictionaryObject()
newRes.update(res1.get(resource, DictionaryObject()).getObject())
page2Res = res2.get(resource, DictionaryObject()).getObject()
renameRes = {}
for key in page2Res.keys():
if key in newRes and newRes[key] != page2Res[key]:
newname = NameObject(key + "renamed")
renameRes[key] = newname
newRes[newname] = page2Res[key]
elif key not in newRes:
newRes[key] = page2Res.raw_get(key)
return newRes, renameRes
def encrypt(self, user_pwd, owner_pwd=None, use_128bit=True):
import time
import random
if owner_pwd is None:
owner_pwd = user_pwd
if use_128bit:
V = 2
rev = 3
keylen = 128 / 8
else:
V = 1
rev = 2
keylen = 40 / 8
# permit everything:
P = -1
O = ByteStringObject(_alg33(owner_pwd, user_pwd, rev, keylen))
ID_1 = md5(repr(time.time())).digest()
ID_2 = md5(repr(random.random())).digest()
self._ID = ArrayObject(
(ByteStringObject(ID_1), ByteStringObject(ID_2)))
if rev == 2:
U, key = _alg34(user_pwd, O, P, ID_1)
else:
assert rev == 3
U, key = _alg35(user_pwd, rev, keylen, O, P, ID_1, False)
encrypt = DictionaryObject()
encrypt[NameObject("/Filter")] = NameObject("/Standard")
encrypt[NameObject("/V")] = NumberObject(V)
if V == 2:
encrypt[NameObject("/Length")] = NumberObject(keylen * 8)
encrypt[NameObject("/R")] = NumberObject(rev)
encrypt[NameObject("/O")] = ByteStringObject(O)
encrypt[NameObject("/U")] = ByteStringObject(U)
encrypt[NameObject("/P")] = NumberObject(P)
self._encrypt = self._addObject(encrypt)
self._encrypt_key = key
def read(self, stream):
# start at the end:
stream.seek(-1, 2)
line = b_('')
while not line:
line = self.readNextEndLine(stream)
if line[:5] != b_("%%EOF"):
raise utils.PdfReadError, "EOF marker not found"
# find startxref entry - the location of the xref table
line = self.readNextEndLine(stream)
startxref = int(line)
line = self.readNextEndLine(stream)
if line[:9] != b_("startxref"):
raise utils.PdfReadError, "startxref not found"
# read all cross reference tables and their trailers
self.xref = {}
self.xref_objStm = {}
self.trailer = DictionaryObject()
while 1:
# load the xref table
stream.seek(startxref, 0)
x = stream.read(1)
if x == b_("x"):
# standard cross-reference table
ref = stream.read(4)
if ref[:3] != b_("ref"):
raise utils.PdfReadError, "xref table read error"
readNonWhitespace(stream)
stream.seek(-1, 1)
# check if the first time looking at the xref table
firsttime = True
while True:
num = readObject(stream, self)
if firsttime and num != 0:
self.xrefIndex = num
warnings.warn("Xref table not zero-indexed. ID "
"numbers for objects will %sbe "
"corrected." %
("" if not self.strict else "not "),
utils.PdfReadWarning)
# if table not zero indexed, could be due to
# error from when PDF was created
# which will lead to mismatched indices later on
firsttime = False
readNonWhitespace(stream)
stream.seek(-1, 1)
size = readObject(stream, self)
readNonWhitespace(stream)
stream.seek(-1, 1)
cnt = 0
while cnt < size:
line = stream.read(20)
# It's very clear in section 3.4.3 of the PDF spec
# that all cross-reference table lines are a fixed
# 20 bytes (as of PDF 1.7). However, some files have
# 21-byte entries (or more) due to the use of \r\n
# (CRLF) EOL's. Detect that case, and adjust the line
# until it does not begin with a \r (CR) or \n (LF).
while line[0] in b_("\x0D\x0A"):
stream.seek(-20 + 1, 1)
line = stream.read(20)
# On the other hand, some malformed PDF files
# use a single character EOL without a preceeding
# space. Detect that case, and seek the stream
# back one character. (0-9 means we've bled into
# the next xref entry, t means we've bled into the
# text "trailer"):
if line[-1] in b_("0123456789t"):
stream.seek(-1, 1)
offset, generation = line[:16].split(b_(" "))
offset, generation = int(offset), int(generation)
self.xref.setdefault(generation, {})
if num in self.xref[generation]:
# It really seems like we should allow the last
# xref table in the file to override previous
# ones. Since we read the file backwards, assume
# any existing key is already set correctly.
pass
else:
self.xref[generation][num] = offset
cnt += 1
num += 1
readNonWhitespace(stream)
stream.seek(-1, 1)
trailertag = stream.read(7)
if trailertag != b_("trailer"):
# more xrefs!
stream.seek(-7, 1)
else:
break
readNonWhitespace(stream)
stream.seek(-1, 1)
newTrailer = readObject(stream, self)
for key, value in newTrailer.items():
self.trailer.setdefault(key, value)
if "/Prev" in newTrailer:
startxref = newTrailer["/Prev"]
else:
break
elif x.isdigit():
# PDF 1.5+ Cross-Reference Stream
stream.seek(-1, 1)
idnum, generation = self.readObjectHeader(stream)
xrefstream = readObject(stream, self)
assert xrefstream["/Type"] == "/XRef"
self.cacheIndirectObject(generation, idnum, xrefstream)
streamData = StringIO(xrefstream.getData())
idx_pairs = xrefstream.get("/Index",
[0, xrefstream.get("/Size")])
entrySizes = xrefstream.get("/W")
for num, size in self._pairs(idx_pairs):
cnt = 0
while cnt < size:
for i in range(len(entrySizes)):
d = streamData.read(entrySizes[i])
di = convertToInt(d, entrySizes[i])
if i == 0:
xref_type = di
elif i == 1:
if xref_type == 0:
# next_free_object = di
pass
elif xref_type == 1:
byte_offset = di
elif xref_type == 2:
objstr_num = di
elif i == 2:
if xref_type == 0:
# next_generation = di
pass
elif xref_type == 1:
generation = di
elif xref_type == 2:
obstr_idx = di
if xref_type == 0:
pass
elif xref_type == 1:
if generation not in self.xref:
self.xref[generation] = {}
if not num in self.xref[generation]:
self.xref[generation][num] = byte_offset
elif xref_type == 2:
if not num in self.xref_objStm:
self.xref_objStm[num] = [objstr_num, obstr_idx]
cnt += 1
num += 1
trailerKeys = "/Root", "/Encrypt", "/Info", "/ID"
for key in trailerKeys:
if key in xrefstream and key not in self.trailer:
self.trailer[NameObject(key)] = xrefstream.raw_get(key)
if "/Prev" in xrefstream:
startxref = xrefstream["/Prev"]
else:
break
else:
# bad xref character at startxref. Let's see if we can find
# the xref table nearby, as we've observed this error with an
# off-by-one before.
stream.seek(-11, 1)
tmp = stream.read(20)
xref_loc = tmp.find(b_("xref"))
if xref_loc != -1:
startxref -= (10 - xref_loc)
continue
else:
# no xref table found at specified location
assert False
break
# if not zero-indexed, verify that the table is correct
# change it if necessary
if self.xrefIndex and not self.strict:
loc = stream.tell()
for gen in self.xref:
if gen == 65535:
continue
for id in self.xref[gen]:
stream.seek(self.xref[gen][id], 0)
pid, pgen = self.readObjectHeader(stream)
if pid == id - self.xrefIndex:
self._zeroXref(gen)
break
# if not, then either it's just plain wrong,
# or the non-zero-index is actually correct
stream.seek(loc, 0) # return to where it was
def read(self, stream):
# start at the end:
stream.seek(-1, 2)
line = b_('')
while not line:
line = self.readNextEndLine(stream)
if line[:5] != b_("%%EOF"):
raise utils.PdfReadError, "EOF marker not found"
# find startxref entry - the location of the xref table
line = self.readNextEndLine(stream)
startxref = int(line)
line = self.readNextEndLine(stream)
if line[:9] != b_("startxref"):
raise utils.PdfReadError, "startxref not found"
# read all cross reference tables and their trailers
self.xref = {}
self.xref_objStm = {}
self.trailer = DictionaryObject()
while 1:
# load the xref table
stream.seek(startxref, 0)
x = stream.read(1)
if x == b_("x"):
# standard cross-reference table
ref = stream.read(4)
if ref[:3] != b_("ref"):
raise utils.PdfReadError, "xref table read error"
readNonWhitespace(stream)
stream.seek(-1, 1)
# check if the first time looking at the xref table
firsttime = True
while True:
num = readObject(stream, self)
if firsttime and num != 0:
self.xrefIndex = num
warnings.warn(
"Xref table not zero-indexed. ID "
"numbers for objects will %sbe "
"corrected." % ("" if not self.strict else "not "),
utils.PdfReadWarning)
# if table not zero indexed, could be due to
# error from when PDF was created
# which will lead to mismatched indices later on
firsttime = False
readNonWhitespace(stream)
stream.seek(-1, 1)
size = readObject(stream, self)
readNonWhitespace(stream)
stream.seek(-1, 1)
cnt = 0
while cnt < size:
line = stream.read(20)
# It's very clear in section 3.4.3 of the PDF spec
# that all cross-reference table lines are a fixed
# 20 bytes (as of PDF 1.7). However, some files have
# 21-byte entries (or more) due to the use of \r\n
# (CRLF) EOL's. Detect that case, and adjust the line
# until it does not begin with a \r (CR) or \n (LF).
while line[0] in b_("\x0D\x0A"):
stream.seek(-20 + 1, 1)
line = stream.read(20)
# On the other hand, some malformed PDF files
# use a single character EOL without a preceeding
# space. Detect that case, and seek the stream
# back one character. (0-9 means we've bled into
# the next xref entry, t means we've bled into the
# text "trailer"):
if line[-1] in b_("0123456789t"):
stream.seek(-1, 1)
offset, generation = line[:16].split(b_(" "))
offset, generation = int(offset), int(generation)
self.xref.setdefault(generation, {})
if num in self.xref[generation]:
# It really seems like we should allow the last
# xref table in the file to override previous
# ones. Since we read the file backwards, assume
# any existing key is already set correctly.
pass
else:
self.xref[generation][num] = offset
cnt += 1
num += 1
readNonWhitespace(stream)
stream.seek(-1, 1)
trailertag = stream.read(7)
if trailertag != b_("trailer"):
# more xrefs!
stream.seek(-7, 1)
else:
break
readNonWhitespace(stream)
stream.seek(-1, 1)
newTrailer = readObject(stream, self)
for key, value in newTrailer.items():
self.trailer.setdefault(key, value)
if "/Prev" in newTrailer:
startxref = newTrailer["/Prev"]
else:
break
elif x.isdigit():
# PDF 1.5+ Cross-Reference Stream
stream.seek(-1, 1)
idnum, generation = self.readObjectHeader(stream)
xrefstream = readObject(stream, self)
assert xrefstream["/Type"] == "/XRef"
self.cacheIndirectObject(generation, idnum, xrefstream)
streamData = StringIO(xrefstream.getData())
idx_pairs = xrefstream.get("/Index",
[0, xrefstream.get("/Size")])
entrySizes = xrefstream.get("/W")
for num, size in self._pairs(idx_pairs):
cnt = 0
while cnt < size:
for i in range(len(entrySizes)):
d = streamData.read(entrySizes[i])
di = convertToInt(d, entrySizes[i])
if i == 0:
xref_type = di
elif i == 1:
if xref_type == 0:
# next_free_object = di
pass
elif xref_type == 1:
byte_offset = di
elif xref_type == 2:
objstr_num = di
elif i == 2:
if xref_type == 0:
# next_generation = di
pass
elif xref_type == 1:
generation = di
elif xref_type == 2:
obstr_idx = di
if xref_type == 0:
pass
elif xref_type == 1:
if generation not in self.xref:
self.xref[generation] = {}
if not num in self.xref[generation]:
self.xref[generation][num] = byte_offset
elif xref_type == 2:
if not num in self.xref_objStm:
self.xref_objStm[num] = [objstr_num, obstr_idx]
cnt += 1
num += 1
trailerKeys = "/Root", "/Encrypt", "/Info", "/ID"
for key in trailerKeys:
if key in xrefstream and key not in self.trailer:
self.trailer[NameObject(key)] = xrefstream.raw_get(key)
if "/Prev" in xrefstream:
startxref = xrefstream["/Prev"]
else:
break
else:
# bad xref character at startxref. Let's see if we can find
# the xref table nearby, as we've observed this error with an
# off-by-one before.
stream.seek(-11, 1)
tmp = stream.read(20)
xref_loc = tmp.find(b_("xref"))
if xref_loc != -1:
startxref -= (10 - xref_loc)
continue
else:
# no xref table found at specified location
assert False
break
# if not zero-indexed, verify that the table is correct
# change it if necessary
if self.xrefIndex and not self.strict:
loc = stream.tell()
for gen in self.xref:
if gen == 65535:
continue
for id in self.xref[gen]:
stream.seek(self.xref[gen][id], 0)
pid, pgen = self.readObjectHeader(stream)
if pid == id - self.xrefIndex:
self._zeroXref(gen)
break
# if not, then either it's just plain wrong,
# or the non-zero-index is actually correct
stream.seek(loc, 0) # return to where it was
def __init__(self, pdf=None, indirectRef=None):
DictionaryObject.__init__(self)
self.pdf = pdf
# Stores the original indirect reference
# to this object in its source PDF
self.indirectRef = indirectRef
def __init__(self):
self._header = b_("%PDF-1.3")
self._objects = [] # array of indirect objects
# The root of our page tree node.
pages = DictionaryObject()
pages.update({
NameObject("/Type"): NameObject("/Pages"),
NameObject("/Count"): NumberObject(0),
NameObject("/Kids"): ArrayObject()
})
self._pages = self._addObject(pages)
# info object
info = DictionaryObject()
info.update({
NameObject("/Producer"):
createStringObject(
u"Python PDF Library - http://pybrary.net/pyPdf/")
})
self._info = self._addObject(info)
# root object
root = DictionaryObject()
root.update({
NameObject("/Type"): NameObject("/Catalog"),
NameObject("/Pages"): self._pages
})
self._root = self._addObject(root)
class PdfFileReader(object):
def __init__(self, stream, strict=True, warndest=None):
# have to dynamically override the default show
# warning since there are no public methods that specify
# the 'file' parameter
def _showwarning(message,
category,
filename,
lineno,
file=warndest,
line=None):
if file is None:
file = sys.stderr
try:
file.write(
warnings.formatwarning(message, category, filename, lineno,
line))
except IOError:
pass
warnings.showwarning = _showwarning
self.strict = strict
self.flattenedPages = None
self.resolvedObjects = {}
self.xrefIndex = 0
if hasattr(stream, 'mode') and 'b' not in stream.mode:
warnings.warn(
"PdfFileReader stream/file object is not in binary "
"mode. It may not be read correctly.", utils.PdfReadWarning)
if type(stream) in (str, unicode):
fileobj = open(stream, 'rb')
stream = StringIO(fileobj.read())
fileobj.close()
self.read(stream)
self.stream = stream
self._override_encryption = False
##
# Retrieves the PDF file's document information dictionary, if it exists.
# Note that some PDF files use metadata streams instead of docinfo
# dictionaries, and these metadata streams will not be accessed by this
# function.
# <p>
# Stability: Added in v1.6, will exist for all future v1.x releases.
# @return Returns a {@link #DocumentInformation DocumentInformation}
# instance, or None if none exists.
def getDocumentInfo(self):
if "/Info" not in self.trailer:
return None
obj = self.trailer['/Info']
retval = DocumentInformation()
retval.update(obj)
return retval
##
# Read-only property that accesses the {@link
# #PdfFileReader.getDocumentInfo getDocumentInfo} function.
# <p>
# Stability: Added in v1.7, will exist for all future v1.x releases.
documentInfo = property(lambda self: self.getDocumentInfo(), None, None)
##
# Retrieves XMP (Extensible Metadata Platform) data from the PDF document
# root.
# <p>
# Stability: Added in v1.12, will exist for all future v1.x releases.
# @return Returns a {@link #generic.XmpInformation XmlInformation}
# instance that can be used to access XMP metadata from the document.
# Can also return None if no metadata was found on the document root.
def getXmpMetadata(self):
try:
self._override_encryption = True
return self.trailer["/Root"].getXmpMetadata()
finally:
self._override_encryption = False
##
# Read-only property that accesses the {@link #PdfFileReader.getXmpData
# getXmpData} function.
# <p>
# Stability: Added in v1.12, will exist for all future v1.x releases.
xmpMetadata = property(lambda self: self.getXmpMetadata(), None, None)
##
# Calculates the number of pages in this PDF file.
# <p>
# Stability: Added in v1.0, will exist for all v1.x releases.
# @return Returns an integer.
def getNumPages(self):
# Flattened pages will not work on an Encrypted PDF
# the PDF file's page count is used in this case. Otherwise,
# the original method (flattened page count) is used.
if self.isEncrypted:
try:
self._override_encryption = True
return self.trailer["/Root"]["/Pages"]["/Count"]
finally:
self._override_encryption = False
else:
if self.flattenedPages is None:
self._flatten()
return len(self.flattenedPages)
##
# Read-only property that accesses the {@link #PdfFileReader.getNumPages
# getNumPages} function.
# <p>
# Stability: Added in v1.7, will exist for all future v1.x releases.
numPages = property(lambda self: self.getNumPages(), None, None)
##
# Retrieves a page by number from this PDF file.
# <p>
# Stability: Added in v1.0, will exist for all v1.x releases.
# @return Returns a {@link #PageObject PageObject} instance.
def getPage(self, pageNumber):
## ensure that we're not trying to access an encrypted PDF
#assert not self.trailer.has_key("/Encrypt")
if self.flattenedPages is None:
self._flatten()
return self.flattenedPages[pageNumber]
##
# Read-only property that accesses the
# {@link #PdfFileReader.getNamedDestinations
# getNamedDestinations} function.
# <p>
# Stability: Added in v1.10, will exist for all future v1.x releases.
namedDestinations = property(lambda self: self.getNamedDestinations(),
None, None)
##
# Retrieves the named destinations present in the document.
# <p>
# Stability: Added in v1.10, will exist for all future v1.x releases.
# @return Returns a dict which maps names to {@link #Destination
# destinations}.
def getNamedDestinations(self, tree=None, retval=None):
if retval is None:
retval = {}
catalog = self.trailer["/Root"]
# get the name tree
if "/Dests" in catalog:
tree = catalog["/Dests"]
elif "/Names" in catalog:
names = catalog['/Names']
if "/Dests" in names:
tree = names['/Dests']
if tree is None:
return retval
if "/Kids" in tree:
# recurse down the tree
for kid in tree["/Kids"]:
self.getNamedDestinations(kid.getObject(), retval)
if "/Names" in tree:
names = tree["/Names"]
for i in range(0, len(names), 2):
key = names[i].getObject()
val = names[i + 1].getObject()
if isinstance(val, DictionaryObject) and '/D' in val:
val = val['/D']
dest = self._buildDestination(key, val)
if dest is not None:
retval[key] = dest
return retval
##
# Read-only property that accesses the {@link #PdfFileReader.getOutlines
# getOutlines} function.
# <p>
# Stability: Added in v1.10, will exist for all future v1.x releases.
outlines = property(lambda self: self.getOutlines(), None, None)
##
# Retrieves the document outline present in the document.
# <p>
# Stability: Added in v1.10, will exist for all future v1.x releases.
# @return Returns a nested list of {@link #Destination destinations}.
def getOutlines(self, node=None, outlines=None):
if outlines is None:
outlines = []
catalog = self.trailer["/Root"]
# get the outline dictionary and named destinations
if "/Outlines" in catalog:
lines = catalog["/Outlines"]
if "/First" in lines:
node = lines["/First"]
self._namedDests = self.getNamedDestinations()
if node is None:
return outlines
# see if there are any more outlines
while 1:
outline = self._buildOutline(node)
if outline:
outlines.append(outline)
# check for sub-outlines
if "/First" in node:
subOutlines = []
self.getOutlines(node["/First"], subOutlines)
if subOutlines:
outlines.append(subOutlines)
if "/Next" not in node:
break
node = node["/Next"]
return outlines
def _buildDestination(self, title, array):
page, typ = array[0:2]
array = array[2:]
return Destination(title, page, typ, *array)
def _buildOutline(self, node):
dest, title, outline = None, None, None
if "/A" in node and "/Title" in node:
# Action, section 8.5 (only type GoTo supported)
title = node["/Title"]
action = node["/A"]
if action["/S"] == "/GoTo":
dest = action["/D"]
elif "/Dest" in node and "/Title" in node:
# Destination, section 8.2.1
title = node["/Title"]
dest = node["/Dest"]
# if destination found, then create outline
if dest:
if isinstance(dest, ArrayObject):
outline = self._buildDestination(title, dest)
elif isinstance(dest, unicode) and dest in self._namedDests:
outline = self._namedDests[dest]
outline[NameObject("/Title")] = title
else:
raise utils.PdfReadError("Unexpected destination %r" % dest)
return outline
##
# Read-only property that emulates a list based upon the {@link
# #PdfFileReader.getNumPages getNumPages} and {@link #PdfFileReader.getPage
# getPage} functions.
# <p>
# Stability: Added in v1.7, and will exist for all future v1.x releases.
pages = property(
lambda self: ConvertFunctionsToVirtualList(self.getNumPages, self.
getPage), None, None)
def _flatten(self, pages=None, inherit=None, indirectRef=None):
inheritablePageAttributes = (NameObject("/Resources"),
NameObject("/MediaBox"),
NameObject("/CropBox"),
NameObject("/Rotate"))
if inherit is None:
inherit = dict()
if pages is None:
self.flattenedPages = []
catalog = self.trailer["/Root"].getObject()
pages = catalog["/Pages"].getObject()
t = pages["/Type"]
if t == "/Pages":
for attr in inheritablePageAttributes:
if attr in pages:
inherit[attr] = pages[attr]
for page in pages["/Kids"]:
addt = {}
if isinstance(page, IndirectObject):
addt["indirectRef"] = page
self._flatten(page.getObject(), inherit, **addt)
elif t == "/Page":
for attr, value in inherit.items():
# if the page has it's own value, it does not inherit the
# parent's value:
if attr not in pages:
pages[attr] = value
pageObj = PageObject(self, indirectRef)
pageObj.update(pages)
self.flattenedPages.append(pageObj)
def getObject(self, indirectReference):
retval = self.resolvedObjects.get(indirectReference.generation,
{}).get(indirectReference.idnum,
None)
if retval is not None:
return retval
if indirectReference.generation == 0 \
and indirectReference.idnum in self.xref_objStm:
# indirect reference to object in object stream
# read the entire object stream into memory
stmnum, idx = self.xref_objStm[indirectReference.idnum]
objStm = IndirectObject(stmnum, 0, self).getObject()
assert objStm['/Type'] == '/ObjStm'
assert idx < objStm['/N']
streamData = StringIO(objStm.getData())
for i in range(objStm['/N']):
objnum = NumberObject.readFromStream(streamData)
readNonWhitespace(streamData)
streamData.seek(-1, 1)
offset = NumberObject.readFromStream(streamData)
readNonWhitespace(streamData)
streamData.seek(-1, 1)
t = streamData.tell()
streamData.seek(objStm['/First'] + offset, 0)
obj = readObject(streamData, self)
self.resolvedObjects[0][objnum] = obj
streamData.seek(t, 0)
return self.resolvedObjects[0][indirectReference.idnum]
if indirectReference.idnum \
not in self.xref[indirectReference.generation]:
warnings.warn(
"Object %d %d not defined." %
(indirectReference.idnum, indirectReference.generation),
utils.PdfReadWarning)
return None
start = self.xref[indirectReference.generation][
indirectReference.idnum]
self.stream.seek(start, 0)
idnum, generation = self.readObjectHeader(self.stream)
try:
assert idnum == indirectReference.idnum
except AssertionError:
if self.xrefIndex:
# Xref table probably had bad indexes due to not
# being zero-indexed
if self.strict:
raise utils.PdfReadError(
"Expected object ID (%d %d) does "
"not match actual (%d %d); xref "
"table not zero-indexed." %
(indirectReference.idnum, indirectReference.generation,
idnum, generation))
else:
# should not happen since the xref table is corrected in
# non-strict mode
pass
else: # some other problem
raise utils.PdfReadError(
"Expected object ID (%d %d) does not "
" match actual (%d %d)." %
(indirectReference.idnum, indirectReference.generation,
idnum, generation))
assert generation == indirectReference.generation
retval = readObject(self.stream, self)
# override encryption is used for the /Encrypt dictionary
if not self._override_encryption and self.isEncrypted:
# if we don't have the encryption key:
if not hasattr(self, '_decryption_key'):
raise Exception("file has not been decrypted")
# otherwise, decrypt here...
pack1 = struct.pack("<i", indirectReference.idnum)[:3]
pack2 = struct.pack("<i", indirectReference.generation)[:2]
key = self._decryption_key + pack1 + pack2
assert len(key) == (len(self._decryption_key) + 5)
md5_hash = md5(key).digest()
key = md5_hash[:min(16, len(self._decryption_key) + 5)]
retval = self._decryptObject(retval, key)
self.cacheIndirectObject(generation, idnum, retval)
return retval
def _decryptObject(self, obj, key):
if isinstance(obj, ByteStringObject) \
or isinstance(obj, TextStringObject):
obj = createStringObject(utils.RC4_encrypt(key,
obj.original_bytes))
elif isinstance(obj, StreamObject):
obj._data = utils.RC4_encrypt(key, obj._data)
elif isinstance(obj, DictionaryObject):
for dictkey, value in obj.items():
obj[dictkey] = self._decryptObject(value, key)
elif isinstance(obj, ArrayObject):
for i in range(len(obj)):
obj[i] = self._decryptObject(obj[i], key)
return obj
def readObjectHeader(self, stream):
# Should never be necessary to read out whitespace, since the
# cross-reference table should put us in the right spot to read the
# object header. In reality... some files have stupid cross reference
# tables that are off by whitespace bytes.
extra = False
utils.skipOverComment(stream)
extra |= utils.skipOverWhitespace(stream)
stream.seek(-1, 1)
idnum = readUntilWhitespace(stream)
extra |= utils.skipOverWhitespace(stream)
stream.seek(-1, 1)
generation = readUntilWhitespace(stream)
stream.read(3)
readNonWhitespace(stream)
stream.seek(-1, 1)
if (extra and self.strict):
#not a fatal error
warnings.warn(
"Superfluous whitespace found in "
"object header %s %s" % (idnum, generation),
utils.PdfReadWarning)
return int(idnum), int(generation)
def cacheIndirectObject(self, generation, idnum, obj):
self.resolvedObjects.setdefault(generation, {})
self.resolvedObjects[generation][idnum] = obj
def read(self, stream):
# start at the end:
stream.seek(-1, 2)
line = b_('')
while not line:
line = self.readNextEndLine(stream)
if line[:5] != b_("%%EOF"):
raise utils.PdfReadError, "EOF marker not found"
# find startxref entry - the location of the xref table
line = self.readNextEndLine(stream)
startxref = int(line)
line = self.readNextEndLine(stream)
if line[:9] != b_("startxref"):
raise utils.PdfReadError, "startxref not found"
# read all cross reference tables and their trailers
self.xref = {}
self.xref_objStm = {}
self.trailer = DictionaryObject()
while 1:
# load the xref table
stream.seek(startxref, 0)
x = stream.read(1)
if x == b_("x"):
# standard cross-reference table
ref = stream.read(4)
if ref[:3] != b_("ref"):
raise utils.PdfReadError, "xref table read error"
readNonWhitespace(stream)
stream.seek(-1, 1)
# check if the first time looking at the xref table
firsttime = True
while True:
num = readObject(stream, self)
if firsttime and num != 0:
self.xrefIndex = num
warnings.warn(
"Xref table not zero-indexed. ID "
"numbers for objects will %sbe "
"corrected." % ("" if not self.strict else "not "),
utils.PdfReadWarning)
# if table not zero indexed, could be due to
# error from when PDF was created
# which will lead to mismatched indices later on
firsttime = False
readNonWhitespace(stream)
stream.seek(-1, 1)
size = readObject(stream, self)
readNonWhitespace(stream)
stream.seek(-1, 1)
cnt = 0
while cnt < size:
line = stream.read(20)
# It's very clear in section 3.4.3 of the PDF spec
# that all cross-reference table lines are a fixed
# 20 bytes (as of PDF 1.7). However, some files have
# 21-byte entries (or more) due to the use of \r\n
# (CRLF) EOL's. Detect that case, and adjust the line
# until it does not begin with a \r (CR) or \n (LF).
while line[0] in b_("\x0D\x0A"):
stream.seek(-20 + 1, 1)
line = stream.read(20)
# On the other hand, some malformed PDF files
# use a single character EOL without a preceeding
# space. Detect that case, and seek the stream
# back one character. (0-9 means we've bled into
# the next xref entry, t means we've bled into the
# text "trailer"):
if line[-1] in b_("0123456789t"):
stream.seek(-1, 1)
offset, generation = line[:16].split(b_(" "))
offset, generation = int(offset), int(generation)
self.xref.setdefault(generation, {})
if num in self.xref[generation]:
# It really seems like we should allow the last
# xref table in the file to override previous
# ones. Since we read the file backwards, assume
# any existing key is already set correctly.
pass
else:
self.xref[generation][num] = offset
cnt += 1
num += 1
readNonWhitespace(stream)
stream.seek(-1, 1)
trailertag = stream.read(7)
if trailertag != b_("trailer"):
# more xrefs!
stream.seek(-7, 1)
else:
break
readNonWhitespace(stream)
stream.seek(-1, 1)
newTrailer = readObject(stream, self)
for key, value in newTrailer.items():
self.trailer.setdefault(key, value)
if "/Prev" in newTrailer:
startxref = newTrailer["/Prev"]
else:
break
elif x.isdigit():
# PDF 1.5+ Cross-Reference Stream
stream.seek(-1, 1)
idnum, generation = self.readObjectHeader(stream)
xrefstream = readObject(stream, self)
assert xrefstream["/Type"] == "/XRef"
self.cacheIndirectObject(generation, idnum, xrefstream)
streamData = StringIO(xrefstream.getData())
idx_pairs = xrefstream.get("/Index",
[0, xrefstream.get("/Size")])
entrySizes = xrefstream.get("/W")
for num, size in self._pairs(idx_pairs):
cnt = 0
while cnt < size:
for i in range(len(entrySizes)):
d = streamData.read(entrySizes[i])
di = convertToInt(d, entrySizes[i])
if i == 0:
xref_type = di
elif i == 1:
if xref_type == 0:
# next_free_object = di
pass
elif xref_type == 1:
byte_offset = di
elif xref_type == 2:
objstr_num = di
elif i == 2:
if xref_type == 0:
# next_generation = di
pass
elif xref_type == 1:
generation = di
elif xref_type == 2:
obstr_idx = di
if xref_type == 0:
pass
elif xref_type == 1:
if generation not in self.xref:
self.xref[generation] = {}
if not num in self.xref[generation]:
self.xref[generation][num] = byte_offset
elif xref_type == 2:
if not num in self.xref_objStm:
self.xref_objStm[num] = [objstr_num, obstr_idx]
cnt += 1
num += 1
trailerKeys = "/Root", "/Encrypt", "/Info", "/ID"
for key in trailerKeys:
if key in xrefstream and key not in self.trailer:
self.trailer[NameObject(key)] = xrefstream.raw_get(key)
if "/Prev" in xrefstream:
startxref = xrefstream["/Prev"]
else:
break
else:
# bad xref character at startxref. Let's see if we can find
# the xref table nearby, as we've observed this error with an
# off-by-one before.
stream.seek(-11, 1)
tmp = stream.read(20)
xref_loc = tmp.find(b_("xref"))
if xref_loc != -1:
startxref -= (10 - xref_loc)
continue
else:
# no xref table found at specified location
assert False
break
# if not zero-indexed, verify that the table is correct
# change it if necessary
if self.xrefIndex and not self.strict:
loc = stream.tell()
for gen in self.xref:
if gen == 65535:
continue
for id in self.xref[gen]:
stream.seek(self.xref[gen][id], 0)
pid, pgen = self.readObjectHeader(stream)
if pid == id - self.xrefIndex:
self._zeroXref(gen)
break
# if not, then either it's just plain wrong,
# or the non-zero-index is actually correct
stream.seek(loc, 0) # return to where it was
def _zeroXref(self, generation):
self.xref[generation] = dict(
(k - self.xrefIndex, v)
for (k, v) in self.xref[generation].iteritems())
def _pairs(self, array):
i = 0
while True:
yield array[i], array[i + 1]
i += 2
if (i + 1) >= len(array):
break
def readNextEndLine(self, stream):
line = b_("")
while True:
x = stream.read(1)
stream.seek(-2, 1)
if x == b_('\n') or x == b_('\r'): # \n = LF; \r = CR
crlf = False
while x == b_('\n') or x == b_('\r'):
x = stream.read(1)
if x == b_('\n') or x == b_('\r'): # account for CR+LF
stream.seek(-1, 1)
crlf = True
stream.seek(-2, 1)
# if using CR+LF, go back 2 bytes, else 1
stream.seek(2 if crlf else 1, 1)
break
else:
line = x + line
return line
##
# When using an encrypted / secured PDF file with the PDF Standard
# encryption handler, this function will allow the file to be decrypted.
# It checks the given password against the document's user password and
# owner password, and then stores the resulting decryption key if either
# password is correct.
# <p>
# It does not matter which password was matched. Both passwords provide
# the correct decryption key that will allow the document to be used with
# this library.
# <p>
# Stability: Added in v1.8, will exist for all future v1.x releases.
#
# @return 0 if the password failed, 1 if the password matched the user
# password, and 2 if the password matched the owner password.
#
# @exception NotImplementedError Document uses an unsupported encryption
# method.
def decrypt(self, password):
self._override_encryption = True
try:
return self._decrypt(password)
finally:
self._override_encryption = False
def _decrypt(self, password):
encrypt = self.trailer['/Encrypt'].getObject()
if encrypt['/Filter'] != '/Standard':
raise NotImplementedError(
"only Standard PDF encryption handler is available")
if not (encrypt['/V'] in (1, 2)):
raise NotImplementedError(
"only algorithm code 1 and 2 are supported")
user_password, key = self._authenticateUserPassword(password)
if user_password:
self._decryption_key = key
return 1
else:
rev = encrypt['/R'].getObject()
if rev == 2:
keylen = 5
else:
keylen = encrypt['/Length'].getObject() // 8
key = _alg33_1(password, rev, keylen)
real_O = encrypt["/O"].getObject()
if rev == 2:
userpass = utils.RC4_encrypt(key, real_O)
else:
val = real_O
for i in range(19, -1, -1):
new_key = b_('')
for l in range(len(key)):
new_key += b_(chr(utils.ord_(key[l]) ^ i))
val = utils.RC4_encrypt(new_key, val)
userpass = val
owner_password, key = self._authenticateUserPassword(userpass)
if owner_password:
self._decryption_key = key
return 2
return 0
def _authenticateUserPassword(self, password):
encrypt = self.trailer['/Encrypt'].getObject()
rev = encrypt['/R'].getObject()
owner_entry = encrypt['/O'].getObject().original_bytes
p_entry = encrypt['/P'].getObject()
id_entry = self.trailer['/ID'].getObject()
id1_entry = id_entry[0].getObject()
real_U = encrypt['/U'].getObject().original_bytes
if rev == 2:
U, key = _alg34(password, owner_entry, p_entry, id1_entry)
elif rev >= 3:
U, key = _alg35(
password, rev, encrypt["/Length"].getObject() // 8,
owner_entry, p_entry, id1_entry,
encrypt.get("/EncryptMetadata",
BooleanObject(False)).getObject())
U, real_U = U[:16], real_U[:16]
return U == real_U, key
def getIsEncrypted(self):
return "/Encrypt" in self.trailer
##
# Read-only boolean property showing whether this PDF file is encrypted.
# Note that this property, if true, will remain true even after the {@link
# #PdfFileReader.decrypt decrypt} function is called.
isEncrypted = property(lambda self: self.getIsEncrypted(), None, None)
def __init__(self, pdf=None, indirectRef=None):
DictionaryObject.__init__(self)
self.pdf = pdf
# Stores the original indirect reference
# to this object in its source PDF
self.indirectRef = indirectRef
def _mergePage(self,
page2,
page2transformation=None,
ctm=None,
expand=False):
# First we work on merging the resource dictionaries. This allows us
# to find out what symbols in the content streams we might need to
# rename.
newResources = DictionaryObject()
rename = {}
originalResources = self["/Resources"].getObject()
page2Resources = page2["/Resources"].getObject()
for res in [
"/ExtGState", "/Font", "/XObject", "/ColorSpace", "/Pattern",
"/Shading", "/Properties"
]:
new, newrename = PageObject._mergeResources(
originalResources, page2Resources, res)
if new:
newResources[NameObject(res)] = new
rename.update(newrename)
# Combine /ProcSet sets.
newResources[NameObject("/ProcSet")] = ArrayObject(
frozenset(
originalResources.get("/ProcSet",
ArrayObject()).getObject()).union(
frozenset(
page2Resources.get(
"/ProcSet",
ArrayObject()).getObject())))
newContentArray = ArrayObject()
originalContent = self.getContents()
if originalContent is not None:
newContentArray.append(
PageObject._pushPopGS(originalContent, self.pdf))
page2Content = page2.getContents()
if page2Content is not None:
if page2transformation is not None:
page2Content = page2transformation(page2Content)
page2Content = PageObject._contentStreamRename(
page2Content, rename, self.pdf)
page2Content = PageObject._pushPopGS(page2Content, self.pdf)
newContentArray.append(page2Content)
# if expanding the page to fit a new page,
# calculate the new media box size
if expand:
corners1 = [
self.mediaBox.getLowerLeft_x().as_numeric(),
self.mediaBox.getLowerLeft_y().as_numeric(),
self.mediaBox.getUpperRight_x().as_numeric(),
self.mediaBox.getUpperRight_y().as_numeric()
]
corners2 = [
page2.mediaBox.getLowerLeft_x().as_numeric(),
page2.mediaBox.getLowerLeft_y().as_numeric(),
page2.mediaBox.getUpperLeft_x().as_numeric(),
page2.mediaBox.getUpperLeft_y().as_numeric(),
page2.mediaBox.getUpperRight_x().as_numeric(),
page2.mediaBox.getUpperRight_y().as_numeric(),
page2.mediaBox.getLowerRight_x().as_numeric(),
page2.mediaBox.getLowerRight_y().as_numeric()
]
if ctm is not None:
new_x = map(
lambda i: ctm[0] * corners2[i] + ctm[2] * corners2[i + 1] +
ctm[4], range(0, 8, 2))
new_y = map(
lambda i: ctm[1] * corners2[i] + ctm[3] * corners2[i + 1] +
ctm[5], range(0, 8, 2))
else:
new_x = corners2[0:8:2]
new_y = corners2[1:8:2]
lowerleft = [min(new_x), min(new_y)]
upperright = [max(new_x), max(new_y)]
lowerleft = [
min(corners1[0], lowerleft[0]),
min(corners1[1], lowerleft[1])
]
upperright = [
max(corners1[2], upperright[0]),
max(corners1[3], upperright[1])
]
self.mediaBox.setLowerLeft(lowerleft)
self.mediaBox.setUpperRight(upperright)
self[NameObject('/Contents')] = ContentStream(newContentArray,
self.pdf)
self[NameObject('/Resources')] = newResources
def write(self, stream):
externalReferenceMap = {}
# PDF objects sometimes have circular references to their /Page objects
# inside their object tree (for example, annotations). Those will be
# indirect references to objects that we've recreated in this PDF. To
# address this problem, PageObject's store their original object
# reference number, and we add it to the external reference map before
# we sweep for indirect references. This forces self-page-referencing
# trees to reference the correct new object location, rather than
# copying in a new copy of the page object.
for objIndex in xrange(len(self._objects)):
obj = self._objects[objIndex]
if isinstance(obj, PageObject) and obj.indirectRef is not None:
data = obj.indirectRef
externalReferenceMap.setdefault(data.pdf, {})
externalReferenceMap[data.pdf].setdefault(data.generation, {})
externalReferenceMap[data.pdf][data.generation][data.idnum] = \
IndirectObject(objIndex + 1, 0, self)
self.stack = []
self._sweepIndirectReferences(externalReferenceMap, self._root)
del self.stack
# Begin writing:
object_positions = []
stream.write(self._header + b_("\n"))
for i in range(len(self._objects)):
idnum = (i + 1)
obj = self._objects[i]
object_positions.append(stream.tell())
stream.write(b_(str(idnum) + " 0 obj\n"))
key = None
if hasattr(self, "_encrypt") and idnum != self._encrypt.idnum:
pack1 = struct.pack("<i", i + 1)[:3]
pack2 = struct.pack("<i", 0)[:2]
key = self._encrypt_key + pack1 + pack2
assert len(key) == (len(self._encrypt_key) + 5)
md5_hash = md5(key).digest()
key = md5_hash[:min(16, len(self._encrypt_key) + 5)]
if obj is not None:
obj.writeToStream(stream, key)
stream.write(b_("\nendobj\n"))
# xref table
xref_location = stream.tell()
stream.write(b_("xref\n"))
stream.write(b_("0 %s\n" % (len(self._objects) + 1)))
stream.write(b_("%010d %05d f \n" % (0, 65535)))
for offset in object_positions:
stream.write(b_("%010d %05d n \n" % (offset, 0)))
# trailer
stream.write(b_("trailer\n"))
trailer = DictionaryObject()
trailer.update({NameObject("/Size"): NumberObject(
len(self._objects) + 1),
NameObject("/Root"): self._root,
NameObject("/Info"): self._info})
if hasattr(self, "_ID"):
trailer[NameObject("/ID")] = self._ID
if hasattr(self, "_encrypt"):
trailer[NameObject("/Encrypt")] = self._encrypt
trailer.writeToStream(stream, None)
# eof
stream.write(b_("\nstartxref\n%s\n%%%%EOF\n" % (xref_location)))
def write(self, stream):
externalReferenceMap = {}
# PDF objects sometimes have circular references to their /Page objects
# inside their object tree (for example, annotations). Those will be
# indirect references to objects that we've recreated in this PDF. To
# address this problem, PageObject's store their original object
# reference number, and we add it to the external reference map before
# we sweep for indirect references. This forces self-page-referencing
# trees to reference the correct new object location, rather than
# copying in a new copy of the page object.
for objIndex in xrange(len(self._objects)):
obj = self._objects[objIndex]
if isinstance(obj, PageObject) and obj.indirectRef is not None:
data = obj.indirectRef
externalReferenceMap.setdefault(data.pdf, {})
externalReferenceMap[data.pdf].setdefault(data.generation, {})
externalReferenceMap[data.pdf][data.generation][data.idnum] = \
IndirectObject(objIndex + 1, 0, self)
self.stack = []
self._sweepIndirectReferences(externalReferenceMap, self._root)
del self.stack
# Begin writing:
object_positions = []
stream.write(self._header + b_("\n"))
for i in range(len(self._objects)):
idnum = (i + 1)
obj = self._objects[i]
object_positions.append(stream.tell())
stream.write(b_(str(idnum) + " 0 obj\n"))
key = None
if hasattr(self, "_encrypt") and idnum != self._encrypt.idnum:
pack1 = struct.pack("<i", i + 1)[:3]
pack2 = struct.pack("<i", 0)[:2]
key = self._encrypt_key + pack1 + pack2
assert len(key) == (len(self._encrypt_key) + 5)
md5_hash = md5(key).digest()
key = md5_hash[:min(16, len(self._encrypt_key) + 5)]
if obj is not None:
obj.writeToStream(stream, key)
stream.write(b_("\nendobj\n"))
# xref table
xref_location = stream.tell()
stream.write(b_("xref\n"))
stream.write(b_("0 %s\n" % (len(self._objects) + 1)))
stream.write(b_("%010d %05d f \n" % (0, 65535)))
for offset in object_positions:
stream.write(b_("%010d %05d n \n" % (offset, 0)))
# trailer
stream.write(b_("trailer\n"))
trailer = DictionaryObject()
trailer.update({
NameObject("/Size"):
NumberObject(len(self._objects) + 1),
NameObject("/Root"):
self._root,
NameObject("/Info"):
self._info
})
if hasattr(self, "_ID"):
trailer[NameObject("/ID")] = self._ID
if hasattr(self, "_encrypt"):
trailer[NameObject("/Encrypt")] = self._encrypt
trailer.writeToStream(stream, None)
# eof
stream.write(b_("\nstartxref\n%s\n%%%%EOF\n" % (xref_location)))
class PdfFileReader(object):
def __init__(self, stream, strict=True, warndest=None):
# have to dynamically override the default show
# warning since there are no public methods that specify
# the 'file' parameter
def _showwarning(message, category, filename,
lineno, file=warndest, line=None):
if file is None:
file = sys.stderr
try:
file.write(warnings.formatwarning(message, category,
filename, lineno, line))
except IOError:
pass
warnings.showwarning = _showwarning
self.strict = strict
self.flattenedPages = None
self.resolvedObjects = {}
self.xrefIndex = 0
if hasattr(stream, 'mode') and 'b' not in stream.mode:
warnings.warn("PdfFileReader stream/file object is not in binary "
"mode. It may not be read correctly.",
utils.PdfReadWarning)
if type(stream) in (str, unicode):
fileobj = open(stream, 'rb')
stream = StringIO(fileobj.read())
fileobj.close()
self.read(stream)
self.stream = stream
self._override_encryption = False
##
# Retrieves the PDF file's document information dictionary, if it exists.
# Note that some PDF files use metadata streams instead of docinfo
# dictionaries, and these metadata streams will not be accessed by this
# function.
# <p>
# Stability: Added in v1.6, will exist for all future v1.x releases.
# @return Returns a {@link #DocumentInformation DocumentInformation}
# instance, or None if none exists.
def getDocumentInfo(self):
if "/Info" not in self.trailer:
return None
obj = self.trailer['/Info']
retval = DocumentInformation()
retval.update(obj)
return retval
##
# Read-only property that accesses the {@link
# #PdfFileReader.getDocumentInfo getDocumentInfo} function.
# <p>
# Stability: Added in v1.7, will exist for all future v1.x releases.
documentInfo = property(lambda self: self.getDocumentInfo(), None, None)
##
# Retrieves XMP (Extensible Metadata Platform) data from the PDF document
# root.
# <p>
# Stability: Added in v1.12, will exist for all future v1.x releases.
# @return Returns a {@link #generic.XmpInformation XmlInformation}
# instance that can be used to access XMP metadata from the document.
# Can also return None if no metadata was found on the document root.
def getXmpMetadata(self):
try:
self._override_encryption = True
return self.trailer["/Root"].getXmpMetadata()
finally:
self._override_encryption = False
##
# Read-only property that accesses the {@link #PdfFileReader.getXmpData
# getXmpData} function.
# <p>
# Stability: Added in v1.12, will exist for all future v1.x releases.
xmpMetadata = property(lambda self: self.getXmpMetadata(), None, None)
##
# Calculates the number of pages in this PDF file.
# <p>
# Stability: Added in v1.0, will exist for all v1.x releases.
# @return Returns an integer.
def getNumPages(self):
# Flattened pages will not work on an Encrypted PDF
# the PDF file's page count is used in this case. Otherwise,
# the original method (flattened page count) is used.
if self.isEncrypted:
try:
self._override_encryption = True
return self.trailer["/Root"]["/Pages"]["/Count"]
finally:
self._override_encryption = False
else:
if self.flattenedPages is None:
self._flatten()
return len(self.flattenedPages)
##
# Read-only property that accesses the {@link #PdfFileReader.getNumPages
# getNumPages} function.
# <p>
# Stability: Added in v1.7, will exist for all future v1.x releases.
numPages = property(lambda self: self.getNumPages(), None, None)
##
# Retrieves a page by number from this PDF file.
# <p>
# Stability: Added in v1.0, will exist for all v1.x releases.
# @return Returns a {@link #PageObject PageObject} instance.
def getPage(self, pageNumber):
## ensure that we're not trying to access an encrypted PDF
#assert not self.trailer.has_key("/Encrypt")
if self.flattenedPages is None:
self._flatten()
return self.flattenedPages[pageNumber]
##
# Read-only property that accesses the
# {@link #PdfFileReader.getNamedDestinations
# getNamedDestinations} function.
# <p>
# Stability: Added in v1.10, will exist for all future v1.x releases.
namedDestinations = property(lambda self: self.getNamedDestinations(),
None, None)
##
# Retrieves the named destinations present in the document.
# <p>
# Stability: Added in v1.10, will exist for all future v1.x releases.
# @return Returns a dict which maps names to {@link #Destination
# destinations}.
def getNamedDestinations(self, tree=None, retval=None):
if retval is None:
retval = {}
catalog = self.trailer["/Root"]
# get the name tree
if "/Dests" in catalog:
tree = catalog["/Dests"]
elif "/Names" in catalog:
names = catalog['/Names']
if "/Dests" in names:
tree = names['/Dests']
if tree is None:
return retval
if "/Kids" in tree:
# recurse down the tree
for kid in tree["/Kids"]:
self.getNamedDestinations(kid.getObject(), retval)
if "/Names" in tree:
names = tree["/Names"]
for i in range(0, len(names), 2):
key = names[i].getObject()
val = names[i+1].getObject()
if isinstance(val, DictionaryObject) and '/D' in val:
val = val['/D']
dest = self._buildDestination(key, val)
if dest is not None:
retval[key] = dest
return retval
##
# Read-only property that accesses the {@link #PdfFileReader.getOutlines
# getOutlines} function.
# <p>
# Stability: Added in v1.10, will exist for all future v1.x releases.
outlines = property(lambda self: self.getOutlines(), None, None)
##
# Retrieves the document outline present in the document.
# <p>
# Stability: Added in v1.10, will exist for all future v1.x releases.
# @return Returns a nested list of {@link #Destination destinations}.
def getOutlines(self, node=None, outlines=None):
if outlines is None:
outlines = []
catalog = self.trailer["/Root"]
# get the outline dictionary and named destinations
if "/Outlines" in catalog:
lines = catalog["/Outlines"]
if "/First" in lines:
node = lines["/First"]
self._namedDests = self.getNamedDestinations()
if node is None:
return outlines
# see if there are any more outlines
while 1:
outline = self._buildOutline(node)
if outline:
outlines.append(outline)
# check for sub-outlines
if "/First" in node:
subOutlines = []
self.getOutlines(node["/First"], subOutlines)
if subOutlines:
outlines.append(subOutlines)
if "/Next" not in node:
break
node = node["/Next"]
return outlines
def _buildDestination(self, title, array):
page, typ = array[0:2]
array = array[2:]
return Destination(title, page, typ, *array)
def _buildOutline(self, node):
dest, title, outline = None, None, None
if "/A" in node and "/Title" in node:
# Action, section 8.5 (only type GoTo supported)
title = node["/Title"]
action = node["/A"]
if action["/S"] == "/GoTo":
dest = action["/D"]
elif "/Dest" in node and "/Title" in node:
# Destination, section 8.2.1
title = node["/Title"]
dest = node["/Dest"]
# if destination found, then create outline
if dest:
if isinstance(dest, ArrayObject):
outline = self._buildDestination(title, dest)
elif isinstance(dest, unicode) and dest in self._namedDests:
outline = self._namedDests[dest]
outline[NameObject("/Title")] = title
else:
raise utils.PdfReadError("Unexpected destination %r" % dest)
return outline
##
# Read-only property that emulates a list based upon the {@link
# #PdfFileReader.getNumPages getNumPages} and {@link #PdfFileReader.getPage
# getPage} functions.
# <p>
# Stability: Added in v1.7, and will exist for all future v1.x releases.
pages = property(lambda self: ConvertFunctionsToVirtualList(
self.getNumPages, self.getPage), None, None)
def _flatten(self, pages=None, inherit=None, indirectRef=None):
inheritablePageAttributes = (NameObject("/Resources"),
NameObject("/MediaBox"),
NameObject("/CropBox"),
NameObject("/Rotate"))
if inherit is None:
inherit = dict()
if pages is None:
self.flattenedPages = []
catalog = self.trailer["/Root"].getObject()
pages = catalog["/Pages"].getObject()
t = pages["/Type"]
if t == "/Pages":
for attr in inheritablePageAttributes:
if attr in pages:
inherit[attr] = pages[attr]
for page in pages["/Kids"]:
addt = {}
if isinstance(page, IndirectObject):
addt["indirectRef"] = page
self._flatten(page.getObject(), inherit, **addt)
elif t == "/Page":
for attr, value in inherit.items():
# if the page has it's own value, it does not inherit the
# parent's value:
if attr not in pages:
pages[attr] = value
pageObj = PageObject(self, indirectRef)
pageObj.update(pages)
self.flattenedPages.append(pageObj)
def getObject(self, indirectReference):
retval = self.resolvedObjects.get(indirectReference.generation,
{}).get(indirectReference.idnum,
None)
if retval is not None:
return retval
if indirectReference.generation == 0 \
and indirectReference.idnum in self.xref_objStm:
# indirect reference to object in object stream
# read the entire object stream into memory
stmnum, idx = self.xref_objStm[indirectReference.idnum]
objStm = IndirectObject(stmnum, 0, self).getObject()
assert objStm['/Type'] == '/ObjStm'
assert idx < objStm['/N']
streamData = StringIO(objStm.getData())
for i in range(objStm['/N']):
objnum = NumberObject.readFromStream(streamData)
readNonWhitespace(streamData)
streamData.seek(-1, 1)
offset = NumberObject.readFromStream(streamData)
readNonWhitespace(streamData)
streamData.seek(-1, 1)
t = streamData.tell()
streamData.seek(objStm['/First']+offset, 0)
obj = readObject(streamData, self)
self.resolvedObjects[0][objnum] = obj
streamData.seek(t, 0)
return self.resolvedObjects[0][indirectReference.idnum]
if indirectReference.idnum \
not in self.xref[indirectReference.generation]:
warnings.warn("Object %d %d not defined." % (
indirectReference.idnum, indirectReference.generation),
utils.PdfReadWarning)
return None
start = self.xref[indirectReference.generation][
indirectReference.idnum]
self.stream.seek(start, 0)
idnum, generation = self.readObjectHeader(self.stream)
try:
assert idnum == indirectReference.idnum
except AssertionError:
if self.xrefIndex:
# Xref table probably had bad indexes due to not
# being zero-indexed
if self.strict:
raise utils.PdfReadError(
"Expected object ID (%d %d) does "
"not match actual (%d %d); xref "
"table not zero-indexed." % (
indirectReference.idnum,
indirectReference.generation,
idnum,
generation))
else:
# should not happen since the xref table is corrected in
# non-strict mode
pass
else: # some other problem
raise utils.PdfReadError("Expected object ID (%d %d) does not "
" match actual (%d %d)." % (
indirectReference.idnum,
indirectReference.generation,
idnum, generation))
assert generation == indirectReference.generation
retval = readObject(self.stream, self)
# override encryption is used for the /Encrypt dictionary
if not self._override_encryption and self.isEncrypted:
# if we don't have the encryption key:
if not hasattr(self, '_decryption_key'):
raise Exception("file has not been decrypted")
# otherwise, decrypt here...
pack1 = struct.pack("<i", indirectReference.idnum)[:3]
pack2 = struct.pack("<i", indirectReference.generation)[:2]
key = self._decryption_key + pack1 + pack2
assert len(key) == (len(self._decryption_key) + 5)
md5_hash = md5(key).digest()
key = md5_hash[:min(16, len(self._decryption_key) + 5)]
retval = self._decryptObject(retval, key)
self.cacheIndirectObject(generation, idnum, retval)
return retval
def _decryptObject(self, obj, key):
if isinstance(obj, ByteStringObject) \
or isinstance(obj, TextStringObject):
obj = createStringObject(utils.RC4_encrypt(key,
obj.original_bytes))
elif isinstance(obj, StreamObject):
obj._data = utils.RC4_encrypt(key, obj._data)
elif isinstance(obj, DictionaryObject):
for dictkey, value in obj.items():
obj[dictkey] = self._decryptObject(value, key)
elif isinstance(obj, ArrayObject):
for i in range(len(obj)):
obj[i] = self._decryptObject(obj[i], key)
return obj
def readObjectHeader(self, stream):
# Should never be necessary to read out whitespace, since the
# cross-reference table should put us in the right spot to read the
# object header. In reality... some files have stupid cross reference
# tables that are off by whitespace bytes.
extra = False
utils.skipOverComment(stream)
extra |= utils.skipOverWhitespace(stream)
stream.seek(-1, 1)
idnum = readUntilWhitespace(stream)
extra |= utils.skipOverWhitespace(stream)
stream.seek(-1, 1)
generation = readUntilWhitespace(stream)
stream.read(3)
readNonWhitespace(stream)
stream.seek(-1, 1)
if (extra and self.strict):
#not a fatal error
warnings.warn("Superfluous whitespace found in "
"object header %s %s" % (idnum, generation),
utils.PdfReadWarning)
return int(idnum), int(generation)
def cacheIndirectObject(self, generation, idnum, obj):
self.resolvedObjects.setdefault(generation, {})
self.resolvedObjects[generation][idnum] = obj
def read(self, stream):
# start at the end:
stream.seek(-1, 2)
line = b_('')
while not line:
line = self.readNextEndLine(stream)
if line[:5] != b_("%%EOF"):
raise utils.PdfReadError, "EOF marker not found"
# find startxref entry - the location of the xref table
line = self.readNextEndLine(stream)
startxref = int(line)
line = self.readNextEndLine(stream)
if line[:9] != b_("startxref"):
raise utils.PdfReadError, "startxref not found"
# read all cross reference tables and their trailers
self.xref = {}
self.xref_objStm = {}
self.trailer = DictionaryObject()
while 1:
# load the xref table
stream.seek(startxref, 0)
x = stream.read(1)
if x == b_("x"):
# standard cross-reference table
ref = stream.read(4)
if ref[:3] != b_("ref"):
raise utils.PdfReadError, "xref table read error"
readNonWhitespace(stream)
stream.seek(-1, 1)
# check if the first time looking at the xref table
firsttime = True
while True:
num = readObject(stream, self)
if firsttime and num != 0:
self.xrefIndex = num
warnings.warn("Xref table not zero-indexed. ID "
"numbers for objects will %sbe "
"corrected." %
("" if not self.strict else "not "),
utils.PdfReadWarning)
# if table not zero indexed, could be due to
# error from when PDF was created
# which will lead to mismatched indices later on
firsttime = False
readNonWhitespace(stream)
stream.seek(-1, 1)
size = readObject(stream, self)
readNonWhitespace(stream)
stream.seek(-1, 1)
cnt = 0
while cnt < size:
line = stream.read(20)
# It's very clear in section 3.4.3 of the PDF spec
# that all cross-reference table lines are a fixed
# 20 bytes (as of PDF 1.7). However, some files have
# 21-byte entries (or more) due to the use of \r\n
# (CRLF) EOL's. Detect that case, and adjust the line
# until it does not begin with a \r (CR) or \n (LF).
while line[0] in b_("\x0D\x0A"):
stream.seek(-20 + 1, 1)
line = stream.read(20)
# On the other hand, some malformed PDF files
# use a single character EOL without a preceeding
# space. Detect that case, and seek the stream
# back one character. (0-9 means we've bled into
# the next xref entry, t means we've bled into the
# text "trailer"):
if line[-1] in b_("0123456789t"):
stream.seek(-1, 1)
offset, generation = line[:16].split(b_(" "))
offset, generation = int(offset), int(generation)
self.xref.setdefault(generation, {})
if num in self.xref[generation]:
# It really seems like we should allow the last
# xref table in the file to override previous
# ones. Since we read the file backwards, assume
# any existing key is already set correctly.
pass
else:
self.xref[generation][num] = offset
cnt += 1
num += 1
readNonWhitespace(stream)
stream.seek(-1, 1)
trailertag = stream.read(7)
if trailertag != b_("trailer"):
# more xrefs!
stream.seek(-7, 1)
else:
break
readNonWhitespace(stream)
stream.seek(-1, 1)
newTrailer = readObject(stream, self)
for key, value in newTrailer.items():
self.trailer.setdefault(key, value)
if "/Prev" in newTrailer:
startxref = newTrailer["/Prev"]
else:
break
elif x.isdigit():
# PDF 1.5+ Cross-Reference Stream
stream.seek(-1, 1)
idnum, generation = self.readObjectHeader(stream)
xrefstream = readObject(stream, self)
assert xrefstream["/Type"] == "/XRef"
self.cacheIndirectObject(generation, idnum, xrefstream)
streamData = StringIO(xrefstream.getData())
idx_pairs = xrefstream.get("/Index",
[0, xrefstream.get("/Size")])
entrySizes = xrefstream.get("/W")
for num, size in self._pairs(idx_pairs):
cnt = 0
while cnt < size:
for i in range(len(entrySizes)):
d = streamData.read(entrySizes[i])
di = convertToInt(d, entrySizes[i])
if i == 0:
xref_type = di
elif i == 1:
if xref_type == 0:
# next_free_object = di
pass
elif xref_type == 1:
byte_offset = di
elif xref_type == 2:
objstr_num = di
elif i == 2:
if xref_type == 0:
# next_generation = di
pass
elif xref_type == 1:
generation = di
elif xref_type == 2:
obstr_idx = di
if xref_type == 0:
pass
elif xref_type == 1:
if generation not in self.xref:
self.xref[generation] = {}
if not num in self.xref[generation]:
self.xref[generation][num] = byte_offset
elif xref_type == 2:
if not num in self.xref_objStm:
self.xref_objStm[num] = [objstr_num, obstr_idx]
cnt += 1
num += 1
trailerKeys = "/Root", "/Encrypt", "/Info", "/ID"
for key in trailerKeys:
if key in xrefstream and key not in self.trailer:
self.trailer[NameObject(key)] = xrefstream.raw_get(key)
if "/Prev" in xrefstream:
startxref = xrefstream["/Prev"]
else:
break
else:
# bad xref character at startxref. Let's see if we can find
# the xref table nearby, as we've observed this error with an
# off-by-one before.
stream.seek(-11, 1)
tmp = stream.read(20)
xref_loc = tmp.find(b_("xref"))
if xref_loc != -1:
startxref -= (10 - xref_loc)
continue
else:
# no xref table found at specified location
assert False
break
# if not zero-indexed, verify that the table is correct
# change it if necessary
if self.xrefIndex and not self.strict:
loc = stream.tell()
for gen in self.xref:
if gen == 65535:
continue
for id in self.xref[gen]:
stream.seek(self.xref[gen][id], 0)
pid, pgen = self.readObjectHeader(stream)
if pid == id - self.xrefIndex:
self._zeroXref(gen)
break
# if not, then either it's just plain wrong,
# or the non-zero-index is actually correct
stream.seek(loc, 0) # return to where it was
def _zeroXref(self, generation):
self.xref[generation] = dict((k-self.xrefIndex, v) for (k, v)
in self.xref[generation].iteritems())
def _pairs(self, array):
i = 0
while True:
yield array[i], array[i+1]
i += 2
if (i+1) >= len(array):
break
def readNextEndLine(self, stream):
line = b_("")
while True:
x = stream.read(1)
stream.seek(-2, 1)
if x == b_('\n') or x == b_('\r'): # \n = LF; \r = CR
crlf = False
while x == b_('\n') or x == b_('\r'):
x = stream.read(1)
if x == b_('\n') or x == b_('\r'): # account for CR+LF
stream.seek(-1, 1)
crlf = True
stream.seek(-2, 1)
# if using CR+LF, go back 2 bytes, else 1
stream.seek(2 if crlf else 1, 1)
break
else:
line = x + line
return line
##
# When using an encrypted / secured PDF file with the PDF Standard
# encryption handler, this function will allow the file to be decrypted.
# It checks the given password against the document's user password and
# owner password, and then stores the resulting decryption key if either
# password is correct.
# <p>
# It does not matter which password was matched. Both passwords provide
# the correct decryption key that will allow the document to be used with
# this library.
# <p>
# Stability: Added in v1.8, will exist for all future v1.x releases.
#
# @return 0 if the password failed, 1 if the password matched the user
# password, and 2 if the password matched the owner password.
#
# @exception NotImplementedError Document uses an unsupported encryption
# method.
def decrypt(self, password):
self._override_encryption = True
try:
return self._decrypt(password)
finally:
self._override_encryption = False
def _decrypt(self, password):
encrypt = self.trailer['/Encrypt'].getObject()
if encrypt['/Filter'] != '/Standard':
raise NotImplementedError(
"only Standard PDF encryption handler is available")
if not (encrypt['/V'] in (1, 2)):
raise NotImplementedError(
"only algorithm code 1 and 2 are supported")
user_password, key = self._authenticateUserPassword(password)
if user_password:
self._decryption_key = key
return 1
else:
rev = encrypt['/R'].getObject()
if rev == 2:
keylen = 5
else:
keylen = encrypt['/Length'].getObject() // 8
key = _alg33_1(password, rev, keylen)
real_O = encrypt["/O"].getObject()
if rev == 2:
userpass = utils.RC4_encrypt(key, real_O)
else:
val = real_O
for i in range(19, -1, -1):
new_key = b_('')
for l in range(len(key)):
new_key += b_(chr(utils.ord_(key[l]) ^ i))
val = utils.RC4_encrypt(new_key, val)
userpass = val
owner_password, key = self._authenticateUserPassword(userpass)
if owner_password:
self._decryption_key = key
return 2
return 0
def _authenticateUserPassword(self, password):
encrypt = self.trailer['/Encrypt'].getObject()
rev = encrypt['/R'].getObject()
owner_entry = encrypt['/O'].getObject().original_bytes
p_entry = encrypt['/P'].getObject()
id_entry = self.trailer['/ID'].getObject()
id1_entry = id_entry[0].getObject()
real_U = encrypt['/U'].getObject().original_bytes
if rev == 2:
U, key = _alg34(password, owner_entry, p_entry, id1_entry)
elif rev >= 3:
U, key = _alg35(password, rev,
encrypt["/Length"].getObject() // 8, owner_entry,
p_entry, id1_entry,
encrypt.get("/EncryptMetadata",
BooleanObject(False)).getObject())
U, real_U = U[:16], real_U[:16]
return U == real_U, key
def getIsEncrypted(self):
return "/Encrypt" in self.trailer
##
# Read-only boolean property showing whether this PDF file is encrypted.
# Note that this property, if true, will remain true even after the {@link
# #PdfFileReader.decrypt decrypt} function is called.
isEncrypted = property(lambda self: self.getIsEncrypted(), None, None)
def __init__(self):
DictionaryObject.__init__(self)
