# -*- coding: utf-8 -*- # # vim: sw=4:expandtab:foldmethod=marker # # Copyright (c) 2006, Mathieu Fenniak # Copyright (c) 2007, Ashish Kulkarni # # All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions are # met: # # * Redistributions of source code must retain the above copyright notice, # this list of conditions and the following disclaimer. # * Redistributions in binary form must reproduce the above copyright notice, # this list of conditions and the following disclaimer in the documentation # and/or other materials provided with the distribution. # * The name of the author may not be used to endorse or promote products # derived from this software without specific prior written permission. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE # POSSIBILITY OF SUCH DAMAGE. """ A pure-Python PDF library with very minimal capabilities. It was designed to be able to split and merge PDF files by page, and that's about all it can do. It may be a solid base for future PDF file work in Python. """ __author__ = "Mathieu Fenniak" __author_email__ = "biziqe@mathieu.fenniak.net" import math import struct from sys import version_info try: from cStringIO import StringIO except ImportError: from StringIO import StringIO import filters import utils import warnings from generic import * from utils import readNonWhitespace, readUntilWhitespace, ConvertFunctionsToVirtualList if version_info < ( 2, 4 ): from sets import ImmutableSet as frozenset if version_info < ( 2, 5 ): from md5 import md5 else: from hashlib import md5 ## # This class supports writing PDF files out, given pages produced by another # class (typically {@link #PdfFileReader PdfFileReader}). class PdfFileWriter(object): def __init__(self): self._header = "%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 _addObject(self, obj): self._objects.append(obj) return IndirectObject(len(self._objects), 0, self) def getObject(self, ido): if ido.pdf != self: raise ValueError("pdf must be self") return self._objects[ido.idnum - 1] ## # Common method for inserting or adding a page to this PDF file. # # @param page The page to add to the document. This argument should be # an instance of {@link #PageObject PageObject}. # @param action The function which will insert the page in the dictionnary. # Takes: page list, page to add. def _addPage(self, page, action): assert page["/Type"] == "/Page" page[NameObject("/Parent")] = self._pages page = self._addObject(page) pages = self.getObject(self._pages) action(pages["/Kids"], page) pages[NameObject("/Count")] = NumberObject(pages["/Count"] + 1) ## # Adds a page to this PDF file. The page is usually acquired from a # {@link #PdfFileReader PdfFileReader} instance. #

# Stability: Added in v1.0, will exist for all v1.x releases. # # @param page The page to add to the document. This argument should be # an instance of {@link #PageObject PageObject}. def addPage(self, page): self._addPage(page, list.append) ## # Insert a page in this PDF file. The page is usually acquired from a # {@link #PdfFileReader PdfFileReader} instance. # # @param page The page to add to the document. This argument should be # an instance of {@link #PageObject PageObject}. # @param index Position at which the page will be inserted. def insertPage(self, page, index=0): self._addPage(page, lambda l, p: l.insert(index, p)) ## # Retrieves a page by number from this PDF file. # @return Returns a {@link #PageObject PageObject} instance. def getPage(self, pageNumber): pages = self.getObject(self._pages) # XXX: crude hack return pages["/Kids"][pageNumber].getObject() ## # Return the number of pages. # @return The number of pages. def getNumPages(self): pages = self.getObject(self._pages) return int(pages[NameObject("/Count")]) ## # Append a blank page to this PDF file and returns it. If no page size # is specified, use the size of the last page; throw # PageSizeNotDefinedError if it doesn't exist. # @param width The width of the new page expressed in default user # space units. # @param height The height of the new page expressed in default user # space units. def addBlankPage(self, width=None, height=None): page = PageObject.createBlankPage(self, width, height) self.addPage(page) return page ## # Insert a blank page to this PDF file and returns it. If no page size # is specified, use the size of the page in the given index; throw # PageSizeNotDefinedError if it doesn't exist. # @param width The width of the new page expressed in default user # space units. # @param height The height of the new page expressed in default user # space units. # @param index Position to add the page. def insertBlankPage(self, width=None, height=None, index=0): if width is None or height is None and \ (self.getNumPages() - 1) >= index: oldpage = self.getPage(index) width = oldpage.mediaBox.getWidth() height = oldpage.mediaBox.getHeight() page = PageObject.createBlankPage(self, width, height) self.insertPage(page, index) return page ## # Encrypt this PDF file with the PDF Standard encryption handler. # @param user_pwd The "user password", which allows for opening and reading # the PDF file with the restrictions provided. # @param owner_pwd The "owner password", which allows for opening the PDF # files without any restrictions. By default, the owner password is the # same as the user password. # @param use_128bit Boolean argument as to whether to use 128bit # encryption. When false, 40bit encryption will be used. By default, this # flag is on. def encrypt(self, user_pwd, owner_pwd = None, use_128bit = True): import time, random if owner_pwd == 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 ## # Writes the collection of pages added to this object out as a PDF file. #

# Stability: Added in v1.0, will exist for all v1.x releases. # @param stream An object to write the file to. The object must support # the write method, and the tell method, similar to a file object. def write(self, stream): import struct 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 != None: data = obj.indirectRef if not externalReferenceMap.has_key(data.pdf): externalReferenceMap[data.pdf] = {} if not externalReferenceMap[data.pdf].has_key(data.generation): externalReferenceMap[data.pdf][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 + "\n") for i in range(len(self._objects)): idnum = (i + 1) obj = self._objects[i] object_positions.append(stream.tell()) stream.write(str(idnum) + " 0 obj\n") key = None if hasattr(self, "_encrypt") and idnum != self._encrypt.idnum: pack1 = struct.pack(" # Stability: Added in v1.0, will exist for all v1.x releases. # # @param stream An object that supports the standard read and seek methods # similar to a file object. class PdfFileReader(object): def __init__(self, stream): self.flattenedPages = None self.resolvedObjects = {} 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. #

# 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 not self.trailer.has_key("/Info"): return None obj = self.trailer['/Info'] retval = DocumentInformation() retval.update(obj) return retval ## # Read-only property that accesses the {@link # #PdfFileReader.getDocumentInfo getDocumentInfo} function. #

# 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. #

# 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. #

# 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. #

# Stability: Added in v1.0, will exist for all v1.x releases. # @return Returns an integer. def getNumPages(self): if self.flattenedPages == None: self._flatten() return len(self.flattenedPages) ## # Read-only property that accesses the {@link #PdfFileReader.getNumPages # getNumPages} function. #

# 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. #

# 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 == None: self._flatten() return self.flattenedPages[pageNumber] ## # Read-only property that accesses the # {@link #PdfFileReader.getNamedDestinations # getNamedDestinations} function. #

# 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. #

# 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 == None: retval = {} catalog = self.trailer["/Root"] # get the name tree if catalog.has_key("/Dests"): tree = catalog["/Dests"] elif catalog.has_key("/Names"): names = catalog['/Names'] if names.has_key("/Dests"): tree = names['/Dests'] if tree == None: return retval if tree.has_key("/Kids"): # recurse down the tree for kid in tree["/Kids"]: self.getNamedDestinations(kid.getObject(), retval) if tree.has_key("/Names"): 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 val.has_key('/D'): val = val['/D'] dest = self._buildDestination(key, val) if dest != None: retval[key] = dest return retval ## # Read-only property that accesses the {@link #PdfFileReader.getOutlines # getOutlines} function. #

# 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. #

# 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 == None: outlines = [] catalog = self.trailer["/Root"] # get the outline dictionary and named destinations if catalog.has_key("/Outlines"): lines = catalog["/Outlines"] if lines.has_key("/First"): node = lines["/First"] self._namedDests = self.getNamedDestinations() if node == 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 node.has_key("/First"): subOutlines = [] self.getOutlines(node["/First"], subOutlines) if subOutlines: outlines.append(subOutlines) if not node.has_key("/Next"): 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 node.has_key("/A") and node.has_key("/Title"): # Action, section 8.5 (only type GoTo supported) title = node["/Title"] action = node["/A"] if action["/S"] == "/GoTo": dest = action["/D"] elif node.has_key("/Dest") and node.has_key("/Title"): # 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 self._namedDests.has_key(dest): 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. #

# 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 == None: inherit = dict() if pages == None: self.flattenedPages = [] catalog = self.trailer["/Root"].getObject() pages = catalog["/Pages"].getObject() t = pages["/Type"] if t == "/Pages": for attr in inheritablePageAttributes: if pages.has_key(attr): 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 not pages.has_key(attr): 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 != None: return retval if indirectReference.generation == 0 and \ self.xref_objStm.has_key(indirectReference.idnum): # 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] start = self.xref[indirectReference.generation][indirectReference.idnum] self.stream.seek(start, 0) idnum, generation = self.readObjectHeader(self.stream) assert idnum == indirectReference.idnum 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... import struct pack1 = struct.pack("= len(array): break def readNextEndLine(self, stream): line = "" while True: x = stream.read(1) stream.seek(-2, 1) if x == '\n' or x == '\r': while x == '\n' or x == '\r': x = stream.read(1) stream.seek(-2, 1) stream.seek(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. #

# 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. #

# 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 = '' for l in range(len(key)): new_key += chr(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() 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()) real_U = encrypt['/U'].getObject().original_bytes return U == real_U, key def getIsEncrypted(self): return self.trailer.has_key("/Encrypt") ## # 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 getRectangle(self, name, defaults): retval = self.get(name) if isinstance(retval, RectangleObject): return retval if retval == None: for d in defaults: retval = self.get(d) if retval != None: break if isinstance(retval, IndirectObject): retval = self.pdf.getObject(retval) retval = RectangleObject(retval) setRectangle(self, name, retval) return retval def setRectangle(self, name, value): if not isinstance(name, NameObject): name = NameObject(name) self[name] = value def deleteRectangle(self, name): del self[name] def createRectangleAccessor(name, fallback): return \ property( lambda self: getRectangle(self, name, fallback), lambda self, value: setRectangle(self, name, value), lambda self: deleteRectangle(self, name) ) ## # This class represents a single page within a PDF file. Typically this object # will be created by accessing the {@link #PdfFileReader.getPage getPage} # function of the {@link #PdfFileReader PdfFileReader} class, but it is # also possible to create an empty page with the createBlankPage static # method. # @param pdf PDF file the page belongs to (optional, defaults to None). class PageObject(DictionaryObject): 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 ## # Returns a new blank page. # If width or height is None, try to get the page size from the # last page of pdf. If pdf is None or contains no page, a # PageSizeNotDefinedError is raised. # @param pdf PDF file the page belongs to # @param width The width of the new page expressed in default user # space units. # @param height The height of the new page expressed in default user # space units. 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 createBlankPage = staticmethod(createBlankPage) ## # Rotates a page clockwise by increments of 90 degrees. #

# Stability: Added in v1.1, will exist for all future v1.x releases. # @param angle Angle to rotate the page. Must be an increment of 90 deg. def rotateClockwise(self, angle): assert angle % 90 == 0 self._rotate(angle) return self ## # Rotates a page counter-clockwise by increments of 90 degrees. #

# Stability: Added in v1.1, will exist for all future v1.x releases. # @param angle Angle to rotate the page. Must be an increment of 90 deg. def rotateCounterClockwise(self, angle): assert angle % 90 == 0 self._rotate(-angle) return self def _rotate(self, angle): currentAngle = self.get("/Rotate", 0) self[NameObject("/Rotate")] = NumberObject(currentAngle + angle) 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 newRes.has_key(key) and newRes[key] != page2Res[key]: newname = NameObject(key + "renamed") renameRes[key] = newname newRes[newname] = page2Res[key] elif not newRes.has_key(key): newRes[key] = page2Res.raw_get(key) return newRes, renameRes _mergeResources = staticmethod(_mergeResources) def _contentStreamRename(stream, rename, pdf): if not rename: return stream stream = ContentStream(stream, pdf) for operands,operator in stream.operations: for i in range(len(operands)): op = operands[i] if isinstance(op, NameObject): operands[i] = rename.get(op, op) return stream _contentStreamRename = staticmethod(_contentStreamRename) def _pushPopGS(contents, pdf): # adds a graphics state "push" and "pop" to the beginning and end # of a content stream. This isolates it from changes such as # transformation matricies. stream = ContentStream(contents, pdf) stream.operations.insert(0, [[], "q"]) stream.operations.append([[], "Q"]) return stream _pushPopGS = staticmethod(_pushPopGS) def _addTransformationMatrix(contents, pdf, ctm): # adds transformation matrix at the beginning of the given # contents stream. a, b, c, d, e, f = ctm contents = ContentStream(contents, pdf) contents.operations.insert(0, [[FloatObject(a), FloatObject(b), FloatObject(c), FloatObject(d), FloatObject(e), FloatObject(f)], " cm"]) return contents _addTransformationMatrix = staticmethod(_addTransformationMatrix) ## # Returns the /Contents object, or None if it doesn't exist. # /Contents is optionnal, as described in PDF Reference 7.7.3.3 def getContents(self): if self.has_key("/Contents"): return self["/Contents"].getObject() else: return None ## # Merges the content streams of two pages into one. Resource references # (i.e. fonts) are maintained from both pages. The mediabox/cropbox/etc # of this page are not altered. The parameter page's content stream will # be added to the end of this page's content stream, meaning that it will # be drawn after, or "on top" of this page. #

# Stability: Added in v1.4, will exist for all future 1.x releases. # @param page2 An instance of {@link #PageObject PageObject} to be merged # into this one. def mergePage(self, page2): self._mergePage(page2) ## # Actually merges the content streams of two pages into one. Resource # references (i.e. fonts) are maintained from both pages. The # mediabox/cropbox/etc of this page are not altered. The parameter page's # content stream will be added to the end of this page's content stream, # meaning that it will be drawn after, or "on top" of this page. # # @param page2 An instance of {@link #PageObject PageObject} to be merged # into this one. # @param page2transformation A fuction which applies a transformation to # the content stream of page2. Takes: page2 # contents stream. Must return: new contents # stream. If omitted, the content stream will # not be modified. def _mergePage(self, page2, page2transformation=None): # 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) self[NameObject('/Contents')] = ContentStream(newContentArray, self.pdf) self[NameObject('/Resources')] = newResources ## # This is similar to mergePage, but a transformation matrix is # applied to the merged stream. # # @param page2 An instance of {@link #PageObject PageObject} to be merged. # @param ctm A 6 elements tuple containing the operands of the # transformation matrix def mergeTransformedPage(self, page2, ctm): self._mergePage(page2, lambda page2Content: PageObject._addTransformationMatrix(page2Content, page2.pdf, ctm)) ## # This is similar to mergePage, but the stream to be merged is scaled # by appling a transformation matrix. # # @param page2 An instance of {@link #PageObject PageObject} to be merged. # @param factor The scaling factor def mergeScaledPage(self, page2, factor): # CTM to scale : [ sx 0 0 sy 0 0 ] return self.mergeTransformedPage(page2, [factor, 0, 0, factor, 0, 0]) ## # This is similar to mergePage, but the stream to be merged is rotated # by appling a transformation matrix. # # @param page2 An instance of {@link #PageObject PageObject} to be merged. # @param rotation The angle of the rotation, in degrees def mergeRotatedPage(self, page2, rotation): rotation = math.radians(rotation) return self.mergeTransformedPage(page2, [math.cos(rotation), math.sin(rotation), -math.sin(rotation), math.cos(rotation), 0, 0]) ## # This is similar to mergePage, but the stream to be merged is translated # by appling a transformation matrix. # # @param page2 An instance of {@link #PageObject PageObject} to be merged. # @param tx The translation on X axis # @param tx The translation on Y axis def mergeTranslatedPage(self, page2, tx, ty): return self.mergeTransformedPage(page2, [1, 0, 0, 1, tx, ty]) ## # This is similar to mergePage, but the stream to be merged is rotated # and scaled by appling a transformation matrix. # # @param page2 An instance of {@link #PageObject PageObject} to be merged. # @param rotation The angle of the rotation, in degrees # @param factor The scaling factor def mergeRotatedScaledPage(self, page2, rotation, scale): rotation = math.radians(rotation) rotating = [[math.cos(rotation), math.sin(rotation),0], [-math.sin(rotation),math.cos(rotation), 0], [0, 0, 1]] scaling = [[scale,0, 0], [0, scale,0], [0, 0, 1]] ctm = utils.matrixMultiply(rotating, scaling) return self.mergeTransformedPage(page2, [ctm[0][0], ctm[0][1], ctm[1][0], ctm[1][1], ctm[2][0], ctm[2][1]]) ## # This is similar to mergePage, but the stream to be merged is translated # and scaled by appling a transformation matrix. # # @param page2 An instance of {@link #PageObject PageObject} to be merged. # @param scale The scaling factor # @param tx The translation on X axis # @param tx The translation on Y axis def mergeScaledTranslatedPage(self, page2, scale, tx, ty): translation = [[1, 0, 0], [0, 1, 0], [tx,ty,1]] scaling = [[scale,0, 0], [0, scale,0], [0, 0, 1]] ctm = utils.matrixMultiply(scaling, translation) return self.mergeTransformedPage(page2, [ctm[0][0], ctm[0][1], ctm[1][0], ctm[1][1], ctm[2][0], ctm[2][1]]) ## # This is similar to mergePage, but the stream to be merged is translated, # rotated and scaled by appling a transformation matrix. # # @param page2 An instance of {@link #PageObject PageObject} to be merged. # @param tx The translation on X axis # @param ty The translation on Y axis # @param rotation The angle of the rotation, in degrees # @param scale The scaling factor def mergeRotatedScaledTranslatedPage(self, page2, rotation, scale, tx, ty): translation = [[1, 0, 0], [0, 1, 0], [tx,ty,1]] rotation = math.radians(rotation) rotating = [[math.cos(rotation), math.sin(rotation),0], [-math.sin(rotation),math.cos(rotation), 0], [0, 0, 1]] scaling = [[scale,0, 0], [0, scale,0], [0, 0, 1]] ctm = utils.matrixMultiply(rotating, scaling) ctm = utils.matrixMultiply(ctm, translation) return self.mergeTransformedPage(page2, [ctm[0][0], ctm[0][1], ctm[1][0], ctm[1][1], ctm[2][0], ctm[2][1]]) ## # Applys a transformation matrix the page. # # @param ctm A 6 elements tuple containing the operands of the # transformation matrix def addTransformation(self, ctm): originalContent = self.getContents() if originalContent is not None: newContent = PageObject._addTransformationMatrix( originalContent, self.pdf, ctm) newContent = PageObject._pushPopGS(newContent, self.pdf) self[NameObject('/Contents')] = newContent ## # Scales a page by the given factors by appling a transformation # matrix to its content and updating the page size. # # @param sx The scaling factor on horizontal axis # @param sy The scaling factor on vertical axis def scale(self, sx, sy): self.addTransformation([sx, 0, 0, sy, 0, 0]) self.mediaBox = RectangleObject([ float(self.mediaBox.getLowerLeft_x()) * sx, float(self.mediaBox.getLowerLeft_y()) * sy, float(self.mediaBox.getUpperRight_x()) * sx, float(self.mediaBox.getUpperRight_y()) * sy]) ## # Scales a page by the given factor by appling a transformation # matrix to its content and updating the page size. # # @param factor The scaling factor def scaleBy(self, factor): self.scale(factor, factor) ## # Scales a page to the specified dimentions by appling a # transformation matrix to its content and updating the page size. # # @param width The new width # @param height The new heigth def scaleTo(self, width, height): sx = width / (self.mediaBox.getUpperRight_x() - self.mediaBox.getLowerLeft_x ()) sy = height / (self.mediaBox.getUpperRight_y() - self.mediaBox.getLowerLeft_x ()) self.scale(sx, sy) ## # Compresses the size of this page by joining all content streams and # applying a FlateDecode filter. #

# Stability: Added in v1.6, will exist for all future v1.x releases. # However, it is possible that this function will perform no action if # content stream compression becomes "automatic" for some reason. def compressContentStreams(self): content = self.getContents() if content is not None: if not isinstance(content, ContentStream): content = ContentStream(content, self.pdf) self[NameObject("/Contents")] = content.flateEncode() ## # Locate all text drawing commands, in the order they are provided in the # content stream, and extract the text. This works well for some PDF # files, but poorly for others, depending on the generator used. This will # be refined in the future. Do not rely on the order of text coming out of # this function, as it will change if this function is made more # sophisticated. #

# Stability: Added in v1.7, will exist for all future v1.x releases. May # be overhauled to provide more ordered text in the future. # @return a unicode string object def extractText(self): text = u"" content = self["/Contents"].getObject() if not isinstance(content, ContentStream): content = ContentStream(content, self.pdf) # Note: we check all strings are TextStringObjects. ByteStringObjects # are strings where the byte->string encoding was unknown, so adding # them to the text here would be gibberish. for operands,operator in content.operations: if operator == "Tj": _text = operands[0] if isinstance(_text, TextStringObject): text += _text elif operator == "T*": text += "\n" elif operator == "'": text += "\n" _text = operands[0] if isinstance(_text, TextStringObject): text += operands[0] elif operator == '"': _text = operands[2] if isinstance(_text, TextStringObject): text += "\n" text += _text elif operator == "TJ": for i in operands[0]: if isinstance(i, TextStringObject): text += i return text ## # A rectangle (RectangleObject), expressed in default user space units, # defining the boundaries of the physical medium on which the page is # intended to be displayed or printed. #

# Stability: Added in v1.4, will exist for all future v1.x releases. mediaBox = createRectangleAccessor("/MediaBox", ()) ## # A rectangle (RectangleObject), expressed in default user space units, # defining the visible region of default user space. When the page is # displayed or printed, its contents are to be clipped (cropped) to this # rectangle and then imposed on the output medium in some # implementation-defined manner. Default value: same as MediaBox. #

# Stability: Added in v1.4, will exist for all future v1.x releases. cropBox = createRectangleAccessor("/CropBox", ("/MediaBox",)) ## # A rectangle (RectangleObject), expressed in default user space units, # defining the region to which the contents of the page should be clipped # when output in a production enviroment. #

# Stability: Added in v1.4, will exist for all future v1.x releases. bleedBox = createRectangleAccessor("/BleedBox", ("/CropBox", "/MediaBox")) ## # A rectangle (RectangleObject), expressed in default user space units, # defining the intended dimensions of the finished page after trimming. #

# Stability: Added in v1.4, will exist for all future v1.x releases. trimBox = createRectangleAccessor("/TrimBox", ("/CropBox", "/MediaBox")) ## # A rectangle (RectangleObject), expressed in default user space units, # defining the extent of the page's meaningful content as intended by the # page's creator. #

# Stability: Added in v1.4, will exist for all future v1.x releases. artBox = createRectangleAccessor("/ArtBox", ("/CropBox", "/MediaBox")) class ContentStream(DecodedStreamObject): def __init__(self, stream, pdf): self.pdf = pdf self.operations = [] # stream may be a StreamObject or an ArrayObject containing # multiple StreamObjects to be cat'd together. stream = stream.getObject() if isinstance(stream, ArrayObject): data = "" for s in stream: data += s.getObject().getData() stream = StringIO(data) else: stream = StringIO(stream.getData()) self.__parseContentStream(stream) def __parseContentStream(self, stream): # file("f:\\tmp.txt", "w").write(stream.read()) stream.seek(0, 0) operands = [] while True: peek = readNonWhitespace(stream) if peek == '': break stream.seek(-1, 1) if peek.isalpha() or peek == "'" or peek == '"': operator = "" while True: tok = stream.read(1) if tok.isspace() or tok in NameObject.delimiterCharacters: stream.seek(-1, 1) break elif tok == '': break operator += tok if operator == "BI": # begin inline image - a completely different parsing # mechanism is required, of course... thanks buddy... assert operands == [] ii = self._readInlineImage(stream) self.operations.append((ii, "INLINE IMAGE")) else: self.operations.append((operands, operator)) operands = [] elif peek == '%': # If we encounter a comment in the content stream, we have to # handle it here. Typically, readObject will handle # encountering a comment -- but readObject assumes that # following the comment must be the object we're trying to # read. In this case, it could be an operator instead. while peek not in ('\r', '\n'): peek = stream.read(1) else: operands.append(readObject(stream, None)) 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 x = readNonWhitespace(stream) stream.seek(-1, 1) return {"settings": settings, "data": data} def _getData(self): newdata = StringIO() for operands,operator in self.operations: if operator == "INLINE IMAGE": newdata.write("BI") dicttext = StringIO() operands["settings"].writeToStream(dicttext, None) newdata.write(dicttext.getvalue()[2:-2]) newdata.write("ID ") newdata.write(operands["data"]) newdata.write("EI") else: for op in operands: op.writeToStream(newdata, None) newdata.write(" ") newdata.write(operator) newdata.write("\n") return newdata.getvalue() def _setData(self, value): self.__parseContentStream(StringIO(value)) _data = property(_getData, _setData) ## # A class representing the basic document metadata provided in a PDF File. #

# As of pyPdf v1.10, all text properties of the document metadata have two # properties, eg. author and author_raw. The non-raw property will always # return a TextStringObject, making it ideal for a case where the metadata is # being displayed. The raw property can sometimes return a ByteStringObject, # if pyPdf was unable to decode the string's text encoding; this requires # additional safety in the caller and therefore is not as commonly accessed. class DocumentInformation(DictionaryObject): def __init__(self): DictionaryObject.__init__(self) def getText(self, key): retval = self.get(key, None) if isinstance(retval, TextStringObject): return retval return None ## # Read-only property accessing the document's title. Added in v1.6, will # exist for all future v1.x releases. Modified in v1.10 to always return a # unicode string (TextStringObject). # @return A unicode string, or None if the title is not provided. title = property(lambda self: self.getText("/Title")) title_raw = property(lambda self: self.get("/Title")) ## # Read-only property accessing the document's author. Added in v1.6, will # exist for all future v1.x releases. Modified in v1.10 to always return a # unicode string (TextStringObject). # @return A unicode string, or None if the author is not provided. author = property(lambda self: self.getText("/Author")) author_raw = property(lambda self: self.get("/Author")) ## # Read-only property accessing the subject of the document. Added in v1.6, # will exist for all future v1.x releases. Modified in v1.10 to always # return a unicode string (TextStringObject). # @return A unicode string, or None if the subject is not provided. subject = property(lambda self: self.getText("/Subject")) subject_raw = property(lambda self: self.get("/Subject")) ## # Read-only property accessing the document's creator. If the document was # converted to PDF from another format, the name of the application (for # example, OpenOffice) that created the original document from which it was # converted. Added in v1.6, will exist for all future v1.x releases. # Modified in v1.10 to always return a unicode string (TextStringObject). # @return A unicode string, or None if the creator is not provided. creator = property(lambda self: self.getText("/Creator")) creator_raw = property(lambda self: self.get("/Creator")) ## # Read-only property accessing the document's producer. If the document # was converted to PDF from another format, the name of the application # (for example, OSX Quartz) that converted it to PDF. Added in v1.6, will # exist for all future v1.x releases. Modified in v1.10 to always return a # unicode string (TextStringObject). # @return A unicode string, or None if the producer is not provided. producer = property(lambda self: self.getText("/Producer")) producer_raw = property(lambda self: self.get("/Producer")) ## # A class representing a destination within a PDF file. # See section 8.2.1 of the PDF 1.6 reference. # Stability: Added in v1.10, will exist for all v1.x releases. class Destination(DictionaryObject): 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) ## # Read-only property accessing the destination title. # @return A string. title = property(lambda self: self.get("/Title")) ## # Read-only property accessing the destination page. # @return An integer. page = property(lambda self: self.get("/Page")) ## # Read-only property accessing the destination type. # @return A string. typ = property(lambda self: self.get("/Type")) ## # Read-only property accessing the zoom factor. # @return A number, or None if not available. zoom = property(lambda self: self.get("/Zoom", None)) ## # Read-only property accessing the left horizontal coordinate. # @return A number, or None if not available. left = property(lambda self: self.get("/Left", None)) ## # Read-only property accessing the right horizontal coordinate. # @return A number, or None if not available. right = property(lambda self: self.get("/Right", None)) ## # Read-only property accessing the top vertical coordinate. # @return A number, or None if not available. top = property(lambda self: self.get("/Top", None)) ## # Read-only property accessing the bottom vertical coordinate. # @return A number, or None if not available. bottom = property(lambda self: self.get("/Bottom", None)) def convertToInt(d, size): if size > 8: raise utils.PdfReadError("invalid size in convertToInt") d = "\x00\x00\x00\x00\x00\x00\x00\x00" + d d = d[-8:] return struct.unpack(">q", d)[0] # ref: pdf1.8 spec section 3.5.2 algorithm 3.2 _encryption_padding = '\x28\xbf\x4e\x5e\x4e\x75\x8a\x41\x64\x00\x4e\x56' + \ '\xff\xfa\x01\x08\x2e\x2e\x00\xb6\xd0\x68\x3e\x80\x2f\x0c' + \ '\xa9\xfe\x64\x53\x69\x7a' # Implementation of algorithm 3.2 of the PDF standard security handler, # section 3.5.2 of the PDF 1.6 reference. def _alg32(password, rev, keylen, owner_entry, p_entry, id1_entry, metadata_encrypt=True): # 1. Pad or truncate the password string to exactly 32 bytes. If the # password string is more than 32 bytes long, use only its first 32 bytes; # if it is less than 32 bytes long, pad it by appending the required number # of additional bytes from the beginning of the padding string # (_encryption_padding). password = (password + _encryption_padding)[:32] # 2. Initialize the MD5 hash function and pass the result of step 1 as # input to this function. import struct m = md5(password) # 3. Pass the value of the encryption dictionary's /O entry to the MD5 hash # function. m.update(owner_entry) # 4. Treat the value of the /P entry as an unsigned 4-byte integer and pass # these bytes to the MD5 hash function, low-order byte first. p_entry = struct.pack('= 3 and not metadata_encrypt: m.update("\xff\xff\xff\xff") # 7. Finish the hash. md5_hash = m.digest() # 8. (Revision 3 or greater) Do the following 50 times: Take the output # from the previous MD5 hash and pass the first n bytes of the output as # input into a new MD5 hash, where n is the number of bytes of the # encryption key as defined by the value of the encryption dictionary's # /Length entry. if rev >= 3: for i in range(50): md5_hash = md5(md5_hash[:keylen]).digest() # 9. Set the encryption key to the first n bytes of the output from the # final MD5 hash, where n is always 5 for revision 2 but, for revision 3 or # greater, depends on the value of the encryption dictionary's /Length # entry. return md5_hash[:keylen] # Implementation of algorithm 3.3 of the PDF standard security handler, # section 3.5.2 of the PDF 1.6 reference. def _alg33(owner_pwd, user_pwd, rev, keylen): # steps 1 - 4 key = _alg33_1(owner_pwd, rev, keylen) # 5. Pad or truncate the user password string as described in step 1 of # algorithm 3.2. user_pwd = (user_pwd + _encryption_padding)[:32] # 6. Encrypt the result of step 5, using an RC4 encryption function with # the encryption key obtained in step 4. val = utils.RC4_encrypt(key, user_pwd) # 7. (Revision 3 or greater) Do the following 19 times: Take the output # from the previous invocation of the RC4 function and pass it as input to # a new invocation of the function; use an encryption key generated by # taking each byte of the encryption key obtained in step 4 and performing # an XOR operation between that byte and the single-byte value of the # iteration counter (from 1 to 19). if rev >= 3: for i in range(1, 20): new_key = '' for l in range(len(key)): new_key += chr(ord(key[l]) ^ i) val = utils.RC4_encrypt(new_key, val) # 8. Store the output from the final invocation of the RC4 as the value of # the /O entry in the encryption dictionary. return val # Steps 1-4 of algorithm 3.3 def _alg33_1(password, rev, keylen): # 1. Pad or truncate the owner password string as described in step 1 of # algorithm 3.2. If there is no owner password, use the user password # instead. password = (password + _encryption_padding)[:32] # 2. Initialize the MD5 hash function and pass the result of step 1 as # input to this function. m = md5(password) # 3. (Revision 3 or greater) Do the following 50 times: Take the output # from the previous MD5 hash and pass it as input into a new MD5 hash. md5_hash = m.digest() if rev >= 3: for i in range(50): md5_hash = md5(md5_hash).digest() # 4. Create an RC4 encryption key using the first n bytes of the output # from the final MD5 hash, where n is always 5 for revision 2 but, for # revision 3 or greater, depends on the value of the encryption # dictionary's /Length entry. key = md5_hash[:keylen] return key # Implementation of algorithm 3.4 of the PDF standard security handler, # section 3.5.2 of the PDF 1.6 reference. def _alg34(password, owner_entry, p_entry, id1_entry): # 1. Create an encryption key based on the user password string, as # described in algorithm 3.2. key = _alg32(password, 2, 5, owner_entry, p_entry, id1_entry) # 2. Encrypt the 32-byte padding string shown in step 1 of algorithm 3.2, # using an RC4 encryption function with the encryption key from the # preceding step. U = utils.RC4_encrypt(key, _encryption_padding) # 3. Store the result of step 2 as the value of the /U entry in the # encryption dictionary. return U, key # Implementation of algorithm 3.4 of the PDF standard security handler, # section 3.5.2 of the PDF 1.6 reference. def _alg35(password, rev, keylen, owner_entry, p_entry, id1_entry, metadata_encrypt): # 1. Create an encryption key based on the user password string, as # described in Algorithm 3.2. key = _alg32(password, rev, keylen, owner_entry, p_entry, id1_entry) # 2. Initialize the MD5 hash function and pass the 32-byte padding string # shown in step 1 of Algorithm 3.2 as input to this function. m = md5() m.update(_encryption_padding) # 3. Pass the first element of the file's file identifier array (the value # of the ID entry in the document's trailer dictionary; see Table 3.13 on # page 73) to the hash function and finish the hash. (See implementation # note 25 in Appendix H.) m.update(id1_entry) md5_hash = m.digest() # 4. Encrypt the 16-byte result of the hash, using an RC4 encryption # function with the encryption key from step 1. val = utils.RC4_encrypt(key, md5_hash) # 5. Do the following 19 times: Take the output from the previous # invocation of the RC4 function and pass it as input to a new invocation # of the function; use an encryption key generated by taking each byte of # the original encryption key (obtained in step 2) and performing an XOR # operation between that byte and the single-byte value of the iteration # counter (from 1 to 19). for i in range(1, 20): new_key = '' for l in range(len(key)): new_key += chr(ord(key[l]) ^ i) val = utils.RC4_encrypt(new_key, val) # 6. Append 16 bytes of arbitrary padding to the output from the final # invocation of the RC4 function and store the 32-byte result as the value # of the U entry in the encryption dictionary. # (implementator note: I don't know what "arbitrary padding" is supposed to # mean, so I have used null bytes. This seems to match a few other # people's implementations) return val + ('\x00' * 16), key #if __name__ == "__main__": # output = PdfFileWriter() # # input1 = PdfFileReader(file("test\\5000-s1-05e.pdf", "rb")) # page1 = input1.getPage(0) # # input2 = PdfFileReader(file("test\\PDFReference16.pdf", "rb")) # page2 = input2.getPage(0) # page3 = input2.getPage(1) # page1.mergePage(page2) # page1.mergePage(page3) # # input3 = PdfFileReader(file("test\\cc-cc.pdf", "rb")) # page1.mergePage(input3.getPage(0)) # # page1.compressContentStreams() # # output.addPage(page1) # output.write(file("test\\merge-test.pdf", "wb"))