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1222 lines
44 KiB
1222 lines
44 KiB
# vim: sw=4:expandtab:foldmethod=marker
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#
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# Copyright (c) 2006, Mathieu Fenniak
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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# * The name of the author may not be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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"""
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Implementation of generic PDF objects (dictionary, number, string, and so on)
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"""
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__author__ = "Mathieu Fenniak"
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__author_email__ = "biziqe@mathieu.fenniak.net"
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import re
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from .utils import readNonWhitespace, RC4_encrypt, skipOverComment
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from .utils import b_, u_, chr_, ord_
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from .utils import PdfStreamError
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import warnings
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from . import filters
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from . import utils
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import decimal
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import codecs
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import sys
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#import debugging
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ObjectPrefix = b_('/<[tf(n%')
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NumberSigns = b_('+-')
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IndirectPattern = re.compile(b_(r"(\d+)\s+(\d+)\s+R[^a-zA-Z]"))
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def readObject(stream, pdf):
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tok = stream.read(1)
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stream.seek(-1, 1) # reset to start
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idx = ObjectPrefix.find(tok)
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if idx == 0:
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# name object
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return NameObject.readFromStream(stream, pdf)
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elif idx == 1:
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# hexadecimal string OR dictionary
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peek = stream.read(2)
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stream.seek(-2, 1) # reset to start
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if peek == b_('<<'):
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return DictionaryObject.readFromStream(stream, pdf)
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else:
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return readHexStringFromStream(stream)
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elif idx == 2:
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# array object
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return ArrayObject.readFromStream(stream, pdf)
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elif idx == 3 or idx == 4:
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# boolean object
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return BooleanObject.readFromStream(stream)
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elif idx == 5:
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# string object
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return readStringFromStream(stream)
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elif idx == 6:
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# null object
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return NullObject.readFromStream(stream)
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elif idx == 7:
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# comment
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while tok not in (b_('\r'), b_('\n')):
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tok = stream.read(1)
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tok = readNonWhitespace(stream)
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stream.seek(-1, 1)
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return readObject(stream, pdf)
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else:
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# number object OR indirect reference
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if tok in NumberSigns:
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# number
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return NumberObject.readFromStream(stream)
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peek = stream.read(20)
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stream.seek(-len(peek), 1) # reset to start
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if IndirectPattern.match(peek) != None:
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return IndirectObject.readFromStream(stream, pdf)
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else:
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return NumberObject.readFromStream(stream)
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class PdfObject(object):
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def getObject(self):
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"""Resolves indirect references."""
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return self
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class NullObject(PdfObject):
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def writeToStream(self, stream, encryption_key):
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stream.write(b_("null"))
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def readFromStream(stream):
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nulltxt = stream.read(4)
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if nulltxt != b_("null"):
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raise utils.PdfReadError("Could not read Null object")
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return NullObject()
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readFromStream = staticmethod(readFromStream)
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class BooleanObject(PdfObject):
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def __init__(self, value):
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self.value = value
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def writeToStream(self, stream, encryption_key):
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if self.value:
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stream.write(b_("true"))
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else:
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stream.write(b_("false"))
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def readFromStream(stream):
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word = stream.read(4)
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if word == b_("true"):
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return BooleanObject(True)
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elif word == b_("fals"):
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stream.read(1)
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return BooleanObject(False)
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else:
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raise utils.PdfReadError('Could not read Boolean object')
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readFromStream = staticmethod(readFromStream)
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class ArrayObject(list, PdfObject):
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def writeToStream(self, stream, encryption_key):
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stream.write(b_("["))
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for data in self:
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stream.write(b_(" "))
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data.writeToStream(stream, encryption_key)
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stream.write(b_(" ]"))
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def readFromStream(stream, pdf):
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arr = ArrayObject()
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tmp = stream.read(1)
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if tmp != b_("["):
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raise utils.PdfReadError("Could not read array")
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while True:
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# skip leading whitespace
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tok = stream.read(1)
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while tok.isspace():
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tok = stream.read(1)
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stream.seek(-1, 1)
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# check for array ending
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peekahead = stream.read(1)
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if peekahead == b_("]"):
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break
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stream.seek(-1, 1)
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# read and append obj
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arr.append(readObject(stream, pdf))
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return arr
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readFromStream = staticmethod(readFromStream)
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class IndirectObject(PdfObject):
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def __init__(self, idnum, generation, pdf):
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self.idnum = idnum
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self.generation = generation
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self.pdf = pdf
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def getObject(self):
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return self.pdf.getObject(self).getObject()
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def __repr__(self):
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return "IndirectObject(%r, %r)" % (self.idnum, self.generation)
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def __eq__(self, other):
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return (
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other != None and
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isinstance(other, IndirectObject) and
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self.idnum == other.idnum and
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self.generation == other.generation and
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self.pdf is other.pdf
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)
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def __ne__(self, other):
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return not self.__eq__(other)
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def writeToStream(self, stream, encryption_key):
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stream.write(b_("%s %s R" % (self.idnum, self.generation)))
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def readFromStream(stream, pdf):
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idnum = b_("")
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while True:
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tok = stream.read(1)
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if not tok:
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# stream has truncated prematurely
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raise PdfStreamError("Stream has ended unexpectedly")
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if tok.isspace():
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break
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idnum += tok
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generation = b_("")
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while True:
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tok = stream.read(1)
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if not tok:
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# stream has truncated prematurely
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raise PdfStreamError("Stream has ended unexpectedly")
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if tok.isspace():
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if not generation:
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continue
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break
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generation += tok
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r = readNonWhitespace(stream)
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if r != b_("R"):
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raise utils.PdfReadError("Error reading indirect object reference at byte %s" % utils.hexStr(stream.tell()))
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return IndirectObject(int(idnum), int(generation), pdf)
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readFromStream = staticmethod(readFromStream)
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class FloatObject(decimal.Decimal, PdfObject):
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def __new__(cls, value="0", context=None):
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try:
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return decimal.Decimal.__new__(cls, utils.str_(value), context)
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except:
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return decimal.Decimal.__new__(cls, str(value))
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def __repr__(self):
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if self == self.to_integral():
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return str(self.quantize(decimal.Decimal(1)))
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else:
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# XXX: this adds useless extraneous zeros.
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return "%.5f" % self
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def as_numeric(self):
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return float(b_(repr(self)))
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def writeToStream(self, stream, encryption_key):
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stream.write(b_(repr(self)))
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class NumberObject(int, PdfObject):
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NumberPattern = re.compile(b_('[^+-.0-9]'))
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ByteDot = b_(".")
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def __new__(cls, value):
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val = int(value)
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try:
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return int.__new__(cls, val)
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except OverflowError:
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return int.__new__(cls, 0)
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def as_numeric(self):
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return int(b_(repr(self)))
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def writeToStream(self, stream, encryption_key):
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stream.write(b_(repr(self)))
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def readFromStream(stream):
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num = utils.readUntilRegex(stream, NumberObject.NumberPattern)
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if num.find(NumberObject.ByteDot) != -1:
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return FloatObject(num)
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else:
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return NumberObject(num)
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readFromStream = staticmethod(readFromStream)
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##
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# Given a string (either a "str" or "unicode"), create a ByteStringObject or a
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# TextStringObject to represent the string.
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def createStringObject(string):
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if isinstance(string, utils.string_type):
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return TextStringObject(string)
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elif isinstance(string, utils.bytes_type):
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try:
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if string.startswith(codecs.BOM_UTF16_BE):
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retval = TextStringObject(string.decode("utf-16"))
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retval.autodetect_utf16 = True
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return retval
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else:
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# This is probably a big performance hit here, but we need to
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# convert string objects into the text/unicode-aware version if
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# possible... and the only way to check if that's possible is
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# to try. Some strings are strings, some are just byte arrays.
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retval = TextStringObject(decode_pdfdocencoding(string))
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retval.autodetect_pdfdocencoding = True
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return retval
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except UnicodeDecodeError:
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return ByteStringObject(string)
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else:
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raise TypeError("createStringObject should have str or unicode arg")
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def readHexStringFromStream(stream):
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stream.read(1)
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txt = ""
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x = b_("")
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while True:
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tok = readNonWhitespace(stream)
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if not tok:
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# stream has truncated prematurely
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raise PdfStreamError("Stream has ended unexpectedly")
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if tok == b_(">"):
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break
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x += tok
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if len(x) == 2:
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txt += chr(int(x, base=16))
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x = b_("")
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if len(x) == 1:
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x += b_("0")
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if len(x) == 2:
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txt += chr(int(x, base=16))
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return createStringObject(b_(txt))
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def readStringFromStream(stream):
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tok = stream.read(1)
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parens = 1
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txt = b_("")
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while True:
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tok = stream.read(1)
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if not tok:
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# stream has truncated prematurely
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raise PdfStreamError("Stream has ended unexpectedly")
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if tok == b_("("):
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parens += 1
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elif tok == b_(")"):
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parens -= 1
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if parens == 0:
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break
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elif tok == b_("\\"):
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tok = stream.read(1)
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if tok == b_("n"):
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tok = b_("\n")
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elif tok == b_("r"):
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tok = b_("\r")
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elif tok == b_("t"):
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tok = b_("\t")
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elif tok == b_("b"):
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tok = b_("\b")
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elif tok == b_("f"):
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tok = b_("\f")
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elif tok == b_("c"):
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tok = b_("\c")
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elif tok == b_("("):
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tok = b_("(")
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elif tok == b_(")"):
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tok = b_(")")
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elif tok == b_("/"):
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tok = b_("/")
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elif tok == b_("\\"):
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tok = b_("\\")
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elif tok in (b_(" "), b_("/"), b_("%"), b_("<"), b_(">"), b_("["),
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b_("]"), b_("#"), b_("_"), b_("&"), b_('$')):
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# odd/unnessecary escape sequences we have encountered
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tok = b_(tok)
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elif tok.isdigit():
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# "The number ddd may consist of one, two, or three
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# octal digits; high-order overflow shall be ignored.
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# Three octal digits shall be used, with leading zeros
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# as needed, if the next character of the string is also
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# a digit." (PDF reference 7.3.4.2, p 16)
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for i in range(2):
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ntok = stream.read(1)
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if ntok.isdigit():
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tok += ntok
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else:
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break
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tok = b_(chr(int(tok, base=8)))
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elif tok in b_("\n\r"):
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# This case is hit when a backslash followed by a line
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# break occurs. If it's a multi-char EOL, consume the
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# second character:
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tok = stream.read(1)
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if not tok in b_("\n\r"):
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stream.seek(-1, 1)
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# Then don't add anything to the actual string, since this
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# line break was escaped:
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tok = b_('')
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else:
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raise utils.PdfReadError(r"Unexpected escaped string: %s" % tok)
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txt += tok
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return createStringObject(txt)
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##
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# Represents a string object where the text encoding could not be determined.
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# This occurs quite often, as the PDF spec doesn't provide an alternate way to
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# represent strings -- for example, the encryption data stored in files (like
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# /O) is clearly not text, but is still stored in a "String" object.
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class ByteStringObject(utils.bytes_type, PdfObject):
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##
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# For compatibility with TextStringObject.original_bytes. This method
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# returns self.
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original_bytes = property(lambda self: self)
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def writeToStream(self, stream, encryption_key):
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bytearr = self
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if encryption_key:
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bytearr = RC4_encrypt(encryption_key, bytearr)
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stream.write(b_("<"))
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stream.write(utils.hexencode(bytearr))
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stream.write(b_(">"))
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##
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# Represents a string object that has been decoded into a real unicode string.
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# If read from a PDF document, this string appeared to match the
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# PDFDocEncoding, or contained a UTF-16BE BOM mark to cause UTF-16 decoding to
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# occur.
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class TextStringObject(utils.string_type, PdfObject):
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autodetect_pdfdocencoding = False
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autodetect_utf16 = False
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##
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# It is occasionally possible that a text string object gets created where
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# a byte string object was expected due to the autodetection mechanism --
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# if that occurs, this "original_bytes" property can be used to
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# back-calculate what the original encoded bytes were.
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original_bytes = property(lambda self: self.get_original_bytes())
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def get_original_bytes(self):
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# We're a text string object, but the library is trying to get our raw
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# bytes. This can happen if we auto-detected this string as text, but
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# we were wrong. It's pretty common. Return the original bytes that
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# would have been used to create this object, based upon the autodetect
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# method.
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if self.autodetect_utf16:
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return codecs.BOM_UTF16_BE + self.encode("utf-16be")
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elif self.autodetect_pdfdocencoding:
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return encode_pdfdocencoding(self)
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else:
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raise Exception("no information about original bytes")
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def writeToStream(self, stream, encryption_key):
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# Try to write the string out as a PDFDocEncoding encoded string. It's
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# nicer to look at in the PDF file. Sadly, we take a performance hit
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# here for trying...
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try:
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bytearr = encode_pdfdocencoding(self)
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except UnicodeEncodeError:
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bytearr = codecs.BOM_UTF16_BE + self.encode("utf-16be")
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if encryption_key:
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bytearr = RC4_encrypt(encryption_key, bytearr)
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obj = ByteStringObject(bytearr)
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obj.writeToStream(stream, None)
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else:
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stream.write(b_("("))
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for c in bytearr:
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if not chr_(c).isalnum() and c != b_(' '):
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stream.write(b_("\\%03o" % ord_(c)))
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else:
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stream.write(b_(chr_(c)))
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stream.write(b_(")"))
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class NameObject(str, PdfObject):
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delimiterPattern = re.compile(b_(r"\s+|[\(\)<>\[\]{}/%]"))
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surfix = b_("/")
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|
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def writeToStream(self, stream, encryption_key):
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stream.write(b_(self))
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def readFromStream(stream, pdf):
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debug = False
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if debug: print((stream.tell()))
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name = stream.read(1)
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if name != NameObject.surfix:
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raise utils.PdfReadError("name read error")
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name += utils.readUntilRegex(stream, NameObject.delimiterPattern,
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ignore_eof=True)
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if debug: print(name)
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try:
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return NameObject(name.decode('utf-8'))
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except (UnicodeEncodeError, UnicodeDecodeError) as e:
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# Name objects should represent irregular characters
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# with a '#' followed by the symbol's hex number
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if not pdf.strict:
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warnings.warn("Illegal character in Name Object", utils.PdfReadWarning)
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return NameObject(name)
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else:
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raise utils.PdfReadError("Illegal character in Name Object")
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readFromStream = staticmethod(readFromStream)
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class DictionaryObject(dict, PdfObject):
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def raw_get(self, key):
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return dict.__getitem__(self, key)
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|
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def __setitem__(self, key, value):
|
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if not isinstance(key, PdfObject):
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raise ValueError("key must be PdfObject")
|
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if not isinstance(value, PdfObject):
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raise ValueError("value must be PdfObject")
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return dict.__setitem__(self, key, value)
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|
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def setdefault(self, key, value=None):
|
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if not isinstance(key, PdfObject):
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raise ValueError("key must be PdfObject")
|
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if not isinstance(value, PdfObject):
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raise ValueError("value must be PdfObject")
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return dict.setdefault(self, key, value)
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|
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def __getitem__(self, key):
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return dict.__getitem__(self, key).getObject()
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##
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# Retrieves XMP (Extensible Metadata Platform) data relevant to the
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# this object, if available.
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# <p>
|
|
# Stability: Added in v1.12, will exist for all future v1.x releases.
|
|
# @return Returns a {@link #xmp.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):
|
|
metadata = self.get("/Metadata", None)
|
|
if metadata == None:
|
|
return None
|
|
metadata = metadata.getObject()
|
|
from . import xmp
|
|
if not isinstance(metadata, xmp.XmpInformation):
|
|
metadata = xmp.XmpInformation(metadata)
|
|
self[NameObject("/Metadata")] = metadata
|
|
return metadata
|
|
|
|
##
|
|
# Read-only property that accesses the {@link
|
|
# #DictionaryObject.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)
|
|
|
|
def writeToStream(self, stream, encryption_key):
|
|
stream.write(b_("<<\n"))
|
|
for key, value in list(self.items()):
|
|
key.writeToStream(stream, encryption_key)
|
|
stream.write(b_(" "))
|
|
value.writeToStream(stream, encryption_key)
|
|
stream.write(b_("\n"))
|
|
stream.write(b_(">>"))
|
|
|
|
def readFromStream(stream, pdf):
|
|
debug = False
|
|
tmp = stream.read(2)
|
|
if tmp != b_("<<"):
|
|
raise utils.PdfReadError("Dictionary read error at byte %s: stream must begin with '<<'" % utils.hexStr(stream.tell()))
|
|
data = {}
|
|
while True:
|
|
tok = readNonWhitespace(stream)
|
|
if tok == b_('\x00'):
|
|
continue
|
|
elif tok == b_('%'):
|
|
stream.seek(-1, 1)
|
|
skipOverComment(stream)
|
|
continue
|
|
if not tok:
|
|
# stream has truncated prematurely
|
|
raise PdfStreamError("Stream has ended unexpectedly")
|
|
|
|
if debug: print(("Tok:", tok))
|
|
if tok == b_(">"):
|
|
stream.read(1)
|
|
break
|
|
stream.seek(-1, 1)
|
|
key = readObject(stream, pdf)
|
|
tok = readNonWhitespace(stream)
|
|
stream.seek(-1, 1)
|
|
value = readObject(stream, pdf)
|
|
if not data.get(key):
|
|
data[key] = value
|
|
elif pdf.strict:
|
|
# multiple definitions of key not permitted
|
|
raise utils.PdfReadError("Multiple definitions in dictionary at byte %s for key %s" \
|
|
% (utils.hexStr(stream.tell()), key))
|
|
else:
|
|
warnings.warn("Multiple definitions in dictionary at byte %s for key %s" \
|
|
% (utils.hexStr(stream.tell()), key), utils.PdfReadWarning)
|
|
|
|
pos = stream.tell()
|
|
s = readNonWhitespace(stream)
|
|
if s == b_('s') and stream.read(5) == b_('tream'):
|
|
eol = stream.read(1)
|
|
# odd PDF file output has spaces after 'stream' keyword but before EOL.
|
|
# patch provided by Danial Sandler
|
|
while eol == b_(' '):
|
|
eol = stream.read(1)
|
|
assert eol in (b_("\n"), b_("\r"))
|
|
if eol == b_("\r"):
|
|
# read \n after
|
|
if stream.read(1) != b_('\n'):
|
|
stream.seek(-1, 1)
|
|
# this is a stream object, not a dictionary
|
|
assert "/Length" in data
|
|
length = data["/Length"]
|
|
if debug: print(data)
|
|
if isinstance(length, IndirectObject):
|
|
t = stream.tell()
|
|
length = pdf.getObject(length)
|
|
stream.seek(t, 0)
|
|
data["__streamdata__"] = stream.read(length)
|
|
if debug: print("here")
|
|
#if debug: print(binascii.hexlify(data["__streamdata__"]))
|
|
e = readNonWhitespace(stream)
|
|
ndstream = stream.read(8)
|
|
if (e + ndstream) != b_("endstream"):
|
|
# (sigh) - the odd PDF file has a length that is too long, so
|
|
# we need to read backwards to find the "endstream" ending.
|
|
# ReportLab (unknown version) generates files with this bug,
|
|
# and Python users into PDF files tend to be our audience.
|
|
# we need to do this to correct the streamdata and chop off
|
|
# an extra character.
|
|
pos = stream.tell()
|
|
stream.seek(-10, 1)
|
|
end = stream.read(9)
|
|
if end == b_("endstream"):
|
|
# we found it by looking back one character further.
|
|
data["__streamdata__"] = data["__streamdata__"][:-1]
|
|
else:
|
|
if debug: print(("E", e, ndstream, debugging.toHex(end)))
|
|
stream.seek(pos, 0)
|
|
raise utils.PdfReadError("Unable to find 'endstream' marker after stream at byte %s." % utils.hexStr(stream.tell()))
|
|
else:
|
|
stream.seek(pos, 0)
|
|
if "__streamdata__" in data:
|
|
return StreamObject.initializeFromDictionary(data)
|
|
else:
|
|
retval = DictionaryObject()
|
|
retval.update(data)
|
|
return retval
|
|
readFromStream = staticmethod(readFromStream)
|
|
|
|
|
|
class TreeObject(DictionaryObject):
|
|
def __init__(self):
|
|
DictionaryObject.__init__(self)
|
|
|
|
def hasChildren(self):
|
|
return '/First' in self
|
|
|
|
def __iter__(self):
|
|
return self.children()
|
|
|
|
def children(self):
|
|
if not self.hasChildren():
|
|
raise StopIteration
|
|
|
|
child = self['/First']
|
|
while True:
|
|
yield child
|
|
if child == self['/Last']:
|
|
raise StopIteration
|
|
child = child['/Next']
|
|
|
|
def addChild(self, child, pdf):
|
|
childObj = child.getObject()
|
|
child = pdf.getReference(childObj)
|
|
assert isinstance(child, IndirectObject)
|
|
|
|
if '/First' not in self:
|
|
self[NameObject('/First')] = child
|
|
self[NameObject('/Count')] = NumberObject(0)
|
|
prev = None
|
|
else:
|
|
prev = self['/Last']
|
|
|
|
self[NameObject('/Last')] = child
|
|
self[NameObject('/Count')] = NumberObject(self[NameObject('/Count')] + 1)
|
|
|
|
if prev:
|
|
prevRef = pdf.getReference(prev)
|
|
assert isinstance(prevRef, IndirectObject)
|
|
childObj[NameObject('/Prev')] = prevRef
|
|
prev[NameObject('/Next')] = child
|
|
|
|
parentRef = pdf.getReference(self)
|
|
assert isinstance(parentRef, IndirectObject)
|
|
childObj[NameObject('/Parent')] = parentRef
|
|
|
|
def removeChild(self, child):
|
|
childObj = child.getObject()
|
|
|
|
if NameObject('/Parent') not in childObj:
|
|
raise ValueError("Removed child does not appear to be a tree item")
|
|
elif childObj[NameObject('/Parent')] != self:
|
|
raise ValueError("Removed child is not a member of this tree")
|
|
|
|
found = False
|
|
prevRef = None
|
|
prev = None
|
|
curRef = self[NameObject('/First')]
|
|
cur = curRef.getObject()
|
|
lastRef = self[NameObject('/Last')]
|
|
last = lastRef.getObject()
|
|
while cur != None:
|
|
if cur == childObj:
|
|
if prev == None:
|
|
if NameObject('/Next') in cur:
|
|
# Removing first tree node
|
|
nextRef = cur[NameObject('/Next')]
|
|
next = nextRef.getObject()
|
|
del next[NameObject('/Prev')]
|
|
self[NameObject('/First')] = nextRef
|
|
self[NameObject('/Count')] = self[NameObject('/Count')] - 1
|
|
|
|
else:
|
|
# Removing only tree node
|
|
assert self[NameObject('/Count')] == 1
|
|
del self[NameObject('/Count')]
|
|
del self[NameObject('/First')]
|
|
if NameObject('/Last') in self:
|
|
del self[NameObject('/Last')]
|
|
else:
|
|
if NameObject('/Next') in cur:
|
|
# Removing middle tree node
|
|
nextRef = cur[NameObject('/Next')]
|
|
next = nextRef.getObject()
|
|
next[NameObject('/Prev')] = prevRef
|
|
prev[NameObject('/Next')] = nextRef
|
|
self[NameObject('/Count')] = self[NameObject('/Count')] - 1
|
|
else:
|
|
# Removing last tree node
|
|
assert cur == last
|
|
del prev[NameObject('/Next')]
|
|
self[NameObject('/Last')] = prevRef
|
|
self[NameObject('/Count')] = self[NameObject('/Count')] - 1
|
|
found = True
|
|
break
|
|
|
|
prevRef = curRef
|
|
prev = cur
|
|
if NameObject('/Next') in cur:
|
|
curRef = cur[NameObject('/Next')]
|
|
cur = curRef.getObject()
|
|
else:
|
|
curRef = None
|
|
cur = None
|
|
|
|
if not found:
|
|
raise ValueError("Removal couldn't find item in tree")
|
|
|
|
del childObj[NameObject('/Parent')]
|
|
if NameObject('/Next') in childObj:
|
|
del childObj[NameObject('/Next')]
|
|
if NameObject('/Prev') in childObj:
|
|
del childObj[NameObject('/Prev')]
|
|
|
|
def emptyTree(self):
|
|
for child in self:
|
|
childObj = child.getObject()
|
|
del childObj[NameObject('/Parent')]
|
|
if NameObject('/Next') in childObj:
|
|
del childObj[NameObject('/Next')]
|
|
if NameObject('/Prev') in childObj:
|
|
del childObj[NameObject('/Prev')]
|
|
|
|
if NameObject('/Count') in self:
|
|
del self[NameObject('/Count')]
|
|
if NameObject('/First') in self:
|
|
del self[NameObject('/First')]
|
|
if NameObject('/Last') in self:
|
|
del self[NameObject('/Last')]
|
|
|
|
|
|
class StreamObject(DictionaryObject):
|
|
def __init__(self):
|
|
self._data = None
|
|
self.decodedSelf = None
|
|
|
|
def writeToStream(self, stream, encryption_key):
|
|
self[NameObject("/Length")] = NumberObject(len(self._data))
|
|
DictionaryObject.writeToStream(self, stream, encryption_key)
|
|
del self["/Length"]
|
|
stream.write(b_("\nstream\n"))
|
|
data = self._data
|
|
if encryption_key:
|
|
data = RC4_encrypt(encryption_key, data)
|
|
stream.write(data)
|
|
stream.write(b_("\nendstream"))
|
|
|
|
def initializeFromDictionary(data):
|
|
if "/Filter" in data:
|
|
retval = EncodedStreamObject()
|
|
else:
|
|
retval = DecodedStreamObject()
|
|
retval._data = data["__streamdata__"]
|
|
del data["__streamdata__"]
|
|
del data["/Length"]
|
|
retval.update(data)
|
|
return retval
|
|
initializeFromDictionary = staticmethod(initializeFromDictionary)
|
|
|
|
def flateEncode(self):
|
|
if "/Filter" in self:
|
|
f = self["/Filter"]
|
|
if isinstance(f, ArrayObject):
|
|
f.insert(0, NameObject("/FlateDecode"))
|
|
else:
|
|
newf = ArrayObject()
|
|
newf.append(NameObject("/FlateDecode"))
|
|
newf.append(f)
|
|
f = newf
|
|
else:
|
|
f = NameObject("/FlateDecode")
|
|
retval = EncodedStreamObject()
|
|
retval[NameObject("/Filter")] = f
|
|
retval._data = filters.FlateDecode.encode(self._data)
|
|
return retval
|
|
|
|
|
|
class DecodedStreamObject(StreamObject):
|
|
def getData(self):
|
|
return self._data
|
|
|
|
def setData(self, data):
|
|
self._data = data
|
|
|
|
|
|
class EncodedStreamObject(StreamObject):
|
|
def __init__(self):
|
|
self.decodedSelf = None
|
|
|
|
def getData(self):
|
|
if self.decodedSelf:
|
|
# cached version of decoded object
|
|
return self.decodedSelf.getData()
|
|
else:
|
|
# create decoded object
|
|
decoded = DecodedStreamObject()
|
|
|
|
decoded._data = filters.decodeStreamData(self)
|
|
for key, value in list(self.items()):
|
|
if not key in ("/Length", "/Filter", "/DecodeParms"):
|
|
decoded[key] = value
|
|
self.decodedSelf = decoded
|
|
return decoded._data
|
|
|
|
def setData(self, data):
|
|
raise utils.PdfReadError("Creating EncodedStreamObject is not currently supported")
|
|
|
|
|
|
class RectangleObject(ArrayObject):
|
|
"""
|
|
This class is used to represent *page boxes* in PyPDF2. These boxes include:
|
|
|
|
* :attr:`artBox <PyPDF2.pdf.PageObject.artBox>`
|
|
* :attr:`bleedBox <PyPDF2.pdf.PageObject.bleedBox>`
|
|
* :attr:`cropBox <PyPDF2.pdf.PageObject.cropBox>`
|
|
* :attr:`mediaBox <PyPDF2.pdf.PageObject.mediaBox>`
|
|
* :attr:`trimBox <PyPDF2.pdf.PageObject.trimBox>`
|
|
"""
|
|
def __init__(self, arr):
|
|
# must have four points
|
|
assert len(arr) == 4
|
|
# automatically convert arr[x] into NumberObject(arr[x]) if necessary
|
|
ArrayObject.__init__(self, [self.ensureIsNumber(x) for x in arr])
|
|
|
|
def ensureIsNumber(self, value):
|
|
if not isinstance(value, (NumberObject, FloatObject)):
|
|
value = FloatObject(value)
|
|
return value
|
|
|
|
def __repr__(self):
|
|
return "RectangleObject(%s)" % repr(list(self))
|
|
|
|
def getLowerLeft_x(self):
|
|
return self[0]
|
|
|
|
def getLowerLeft_y(self):
|
|
return self[1]
|
|
|
|
def getUpperRight_x(self):
|
|
return self[2]
|
|
|
|
def getUpperRight_y(self):
|
|
return self[3]
|
|
|
|
def getUpperLeft_x(self):
|
|
return self.getLowerLeft_x()
|
|
|
|
def getUpperLeft_y(self):
|
|
return self.getUpperRight_y()
|
|
|
|
def getLowerRight_x(self):
|
|
return self.getUpperRight_x()
|
|
|
|
def getLowerRight_y(self):
|
|
return self.getLowerLeft_y()
|
|
|
|
def getLowerLeft(self):
|
|
return self.getLowerLeft_x(), self.getLowerLeft_y()
|
|
|
|
def getLowerRight(self):
|
|
return self.getLowerRight_x(), self.getLowerRight_y()
|
|
|
|
def getUpperLeft(self):
|
|
return self.getUpperLeft_x(), self.getUpperLeft_y()
|
|
|
|
def getUpperRight(self):
|
|
return self.getUpperRight_x(), self.getUpperRight_y()
|
|
|
|
def setLowerLeft(self, value):
|
|
self[0], self[1] = [self.ensureIsNumber(x) for x in value]
|
|
|
|
def setLowerRight(self, value):
|
|
self[2], self[1] = [self.ensureIsNumber(x) for x in value]
|
|
|
|
def setUpperLeft(self, value):
|
|
self[0], self[3] = [self.ensureIsNumber(x) for x in value]
|
|
|
|
def setUpperRight(self, value):
|
|
self[2], self[3] = [self.ensureIsNumber(x) for x in value]
|
|
|
|
def getWidth(self):
|
|
return self.getUpperRight_x() - self.getLowerLeft_x()
|
|
|
|
def getHeight(self):
|
|
return self.getUpperRight_y() - self.getLowerLeft_y()
|
|
|
|
lowerLeft = property(getLowerLeft, setLowerLeft, None, None)
|
|
"""
|
|
Property to read and modify the lower left coordinate of this box
|
|
in (x,y) form.
|
|
"""
|
|
lowerRight = property(getLowerRight, setLowerRight, None, None)
|
|
"""
|
|
Property to read and modify the lower right coordinate of this box
|
|
in (x,y) form.
|
|
"""
|
|
upperLeft = property(getUpperLeft, setUpperLeft, None, None)
|
|
"""
|
|
Property to read and modify the upper left coordinate of this box
|
|
in (x,y) form.
|
|
"""
|
|
upperRight = property(getUpperRight, setUpperRight, None, None)
|
|
"""
|
|
Property to read and modify the upper right coordinate of this box
|
|
in (x,y) form.
|
|
"""
|
|
|
|
|
|
class Field(TreeObject):
|
|
"""
|
|
A class representing a field dictionary. This class is accessed through
|
|
:meth:`getFields()<PyPDF2.PdfFileReader.getFields>`
|
|
"""
|
|
def __init__(self, data):
|
|
DictionaryObject.__init__(self)
|
|
attributes = ("/FT", "/Parent", "/Kids", "/T", "/TU", "/TM", "/Ff",
|
|
"/V", "/DV", "/AA")
|
|
for attr in attributes:
|
|
try:
|
|
self[NameObject(attr)] = data[attr]
|
|
except KeyError:
|
|
pass
|
|
|
|
fieldType = property(lambda self: self.get("/FT"))
|
|
"""
|
|
Read-only property accessing the type of this field.
|
|
"""
|
|
|
|
parent = property(lambda self: self.get("/Parent"))
|
|
"""
|
|
Read-only property accessing the parent of this field.
|
|
"""
|
|
|
|
kids = property(lambda self: self.get("/Kids"))
|
|
"""
|
|
Read-only property accessing the kids of this field.
|
|
"""
|
|
|
|
name = property(lambda self: self.get("/T"))
|
|
"""
|
|
Read-only property accessing the name of this field.
|
|
"""
|
|
|
|
altName = property(lambda self: self.get("/TU"))
|
|
"""
|
|
Read-only property accessing the alternate name of this field.
|
|
"""
|
|
|
|
mappingName = property(lambda self: self.get("/TM"))
|
|
"""
|
|
Read-only property accessing the mapping name of this field. This
|
|
name is used by PyPDF2 as a key in the dictionary returned by
|
|
:meth:`getFields()<PyPDF2.PdfFileReader.getFields>`
|
|
"""
|
|
|
|
flags = property(lambda self: self.get("/Ff"))
|
|
"""
|
|
Read-only property accessing the field flags, specifying various
|
|
characteristics of the field (see Table 8.70 of the PDF 1.7 reference).
|
|
"""
|
|
|
|
value = property(lambda self: self.get("/V"))
|
|
"""
|
|
Read-only property accessing the value of this field. Format
|
|
varies based on field type.
|
|
"""
|
|
|
|
defaultValue = property(lambda self: self.get("/DV"))
|
|
"""
|
|
Read-only property accessing the default value of this field.
|
|
"""
|
|
|
|
additionalActions = property(lambda self: self.get("/AA"))
|
|
"""
|
|
Read-only property accessing the additional actions dictionary.
|
|
This dictionary defines the field's behavior in response to trigger events.
|
|
See Section 8.5.2 of the PDF 1.7 reference.
|
|
"""
|
|
|
|
|
|
class Destination(TreeObject):
|
|
"""
|
|
A class representing a destination within a PDF file.
|
|
See section 8.2.1 of the PDF 1.6 reference.
|
|
|
|
:param str title: Title of this destination.
|
|
:param int page: Page number of this destination.
|
|
:param str typ: How the destination is displayed.
|
|
:param args: Additional arguments may be necessary depending on the type.
|
|
:raises PdfReadError: If destination type is invalid.
|
|
|
|
Valid ``typ`` arguments (see PDF spec for details):
|
|
/Fit No additional arguments
|
|
/XYZ [left] [top] [zoomFactor]
|
|
/FitH [top]
|
|
/FitV [left]
|
|
/FitR [left] [bottom] [right] [top]
|
|
/FitB No additional arguments
|
|
/FitBH [top]
|
|
/FitBV [left]
|
|
"""
|
|
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 1.7 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 getDestArray(self):
|
|
return ArrayObject([self.raw_get('/Page'), self['/Type']] + [self[x] for x in ['/Left', '/Bottom', '/Right', '/Top', '/Zoom'] if x in self])
|
|
|
|
def writeToStream(self, stream, encryption_key):
|
|
stream.write(b_("<<\n"))
|
|
key = NameObject('/D')
|
|
key.writeToStream(stream, encryption_key)
|
|
stream.write(b_(" "))
|
|
value = self.getDestArray()
|
|
value.writeToStream(stream, encryption_key)
|
|
|
|
key = NameObject("/S")
|
|
key.writeToStream(stream, encryption_key)
|
|
stream.write(b_(" "))
|
|
value = NameObject("/GoTo")
|
|
value.writeToStream(stream, encryption_key)
|
|
|
|
stream.write(b_("\n"))
|
|
stream.write(b_(">>"))
|
|
|
|
title = property(lambda self: self.get("/Title"))
|
|
"""
|
|
Read-only property accessing the destination title.
|
|
|
|
:rtype: str
|
|
"""
|
|
|
|
page = property(lambda self: self.get("/Page"))
|
|
"""
|
|
Read-only property accessing the destination page number.
|
|
|
|
:rtype: int
|
|
"""
|
|
|
|
typ = property(lambda self: self.get("/Type"))
|
|
"""
|
|
Read-only property accessing the destination type.
|
|
|
|
:rtype: str
|
|
"""
|
|
|
|
zoom = property(lambda self: self.get("/Zoom", None))
|
|
"""
|
|
Read-only property accessing the zoom factor.
|
|
|
|
:rtype: int, or ``None`` if not available.
|
|
"""
|
|
|
|
left = property(lambda self: self.get("/Left", None))
|
|
"""
|
|
Read-only property accessing the left horizontal coordinate.
|
|
|
|
:rtype: int, or ``None`` if not available.
|
|
"""
|
|
|
|
right = property(lambda self: self.get("/Right", None))
|
|
"""
|
|
Read-only property accessing the right horizontal coordinate.
|
|
|
|
:rtype: int, or ``None`` if not available.
|
|
"""
|
|
|
|
top = property(lambda self: self.get("/Top", None))
|
|
"""
|
|
Read-only property accessing the top vertical coordinate.
|
|
|
|
:rtype: int, or ``None`` if not available.
|
|
"""
|
|
|
|
bottom = property(lambda self: self.get("/Bottom", None))
|
|
"""
|
|
Read-only property accessing the bottom vertical coordinate.
|
|
|
|
:rtype: int, or ``None`` if not available.
|
|
"""
|
|
|
|
|
|
class Bookmark(Destination):
|
|
def writeToStream(self, stream, encryption_key):
|
|
stream.write(b_("<<\n"))
|
|
for key in [NameObject(x) for x in ['/Title', '/Parent', '/First', '/Last', '/Next', '/Prev'] if x in self]:
|
|
key.writeToStream(stream, encryption_key)
|
|
stream.write(b_(" "))
|
|
value = self.raw_get(key)
|
|
value.writeToStream(stream, encryption_key)
|
|
stream.write(b_("\n"))
|
|
key = NameObject('/Dest')
|
|
key.writeToStream(stream, encryption_key)
|
|
stream.write(b_(" "))
|
|
value = self.getDestArray()
|
|
value.writeToStream(stream, encryption_key)
|
|
stream.write(b_("\n"))
|
|
stream.write(b_(">>"))
|
|
|
|
|
|
def encode_pdfdocencoding(unicode_string):
|
|
retval = b_('')
|
|
for c in unicode_string:
|
|
try:
|
|
retval += b_(chr(_pdfDocEncoding_rev[c]))
|
|
except KeyError:
|
|
raise UnicodeEncodeError("pdfdocencoding", c, -1, -1,
|
|
"does not exist in translation table")
|
|
return retval
|
|
|
|
|
|
def decode_pdfdocencoding(byte_array):
|
|
retval = u_('')
|
|
for b in byte_array:
|
|
c = _pdfDocEncoding[ord_(b)]
|
|
if c == u_('\u0000'):
|
|
raise UnicodeDecodeError("pdfdocencoding", utils.barray(b), -1, -1,
|
|
"does not exist in translation table")
|
|
retval += c
|
|
return retval
|
|
|
|
_pdfDocEncoding = (
|
|
u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'),
|
|
u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'),
|
|
u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'), u_('\u0000'),
|
|
u_('\u02d8'), u_('\u02c7'), u_('\u02c6'), u_('\u02d9'), u_('\u02dd'), u_('\u02db'), u_('\u02da'), u_('\u02dc'),
|
|
u_('\u0020'), u_('\u0021'), u_('\u0022'), u_('\u0023'), u_('\u0024'), u_('\u0025'), u_('\u0026'), u_('\u0027'),
|
|
u_('\u0028'), u_('\u0029'), u_('\u002a'), u_('\u002b'), u_('\u002c'), u_('\u002d'), u_('\u002e'), u_('\u002f'),
|
|
u_('\u0030'), u_('\u0031'), u_('\u0032'), u_('\u0033'), u_('\u0034'), u_('\u0035'), u_('\u0036'), u_('\u0037'),
|
|
u_('\u0038'), u_('\u0039'), u_('\u003a'), u_('\u003b'), u_('\u003c'), u_('\u003d'), u_('\u003e'), u_('\u003f'),
|
|
u_('\u0040'), u_('\u0041'), u_('\u0042'), u_('\u0043'), u_('\u0044'), u_('\u0045'), u_('\u0046'), u_('\u0047'),
|
|
u_('\u0048'), u_('\u0049'), u_('\u004a'), u_('\u004b'), u_('\u004c'), u_('\u004d'), u_('\u004e'), u_('\u004f'),
|
|
u_('\u0050'), u_('\u0051'), u_('\u0052'), u_('\u0053'), u_('\u0054'), u_('\u0055'), u_('\u0056'), u_('\u0057'),
|
|
u_('\u0058'), u_('\u0059'), u_('\u005a'), u_('\u005b'), u_('\u005c'), u_('\u005d'), u_('\u005e'), u_('\u005f'),
|
|
u_('\u0060'), u_('\u0061'), u_('\u0062'), u_('\u0063'), u_('\u0064'), u_('\u0065'), u_('\u0066'), u_('\u0067'),
|
|
u_('\u0068'), u_('\u0069'), u_('\u006a'), u_('\u006b'), u_('\u006c'), u_('\u006d'), u_('\u006e'), u_('\u006f'),
|
|
u_('\u0070'), u_('\u0071'), u_('\u0072'), u_('\u0073'), u_('\u0074'), u_('\u0075'), u_('\u0076'), u_('\u0077'),
|
|
u_('\u0078'), u_('\u0079'), u_('\u007a'), u_('\u007b'), u_('\u007c'), u_('\u007d'), u_('\u007e'), u_('\u0000'),
|
|
u_('\u2022'), u_('\u2020'), u_('\u2021'), u_('\u2026'), u_('\u2014'), u_('\u2013'), u_('\u0192'), u_('\u2044'),
|
|
u_('\u2039'), u_('\u203a'), u_('\u2212'), u_('\u2030'), u_('\u201e'), u_('\u201c'), u_('\u201d'), u_('\u2018'),
|
|
u_('\u2019'), u_('\u201a'), u_('\u2122'), u_('\ufb01'), u_('\ufb02'), u_('\u0141'), u_('\u0152'), u_('\u0160'),
|
|
u_('\u0178'), u_('\u017d'), u_('\u0131'), u_('\u0142'), u_('\u0153'), u_('\u0161'), u_('\u017e'), u_('\u0000'),
|
|
u_('\u20ac'), u_('\u00a1'), u_('\u00a2'), u_('\u00a3'), u_('\u00a4'), u_('\u00a5'), u_('\u00a6'), u_('\u00a7'),
|
|
u_('\u00a8'), u_('\u00a9'), u_('\u00aa'), u_('\u00ab'), u_('\u00ac'), u_('\u0000'), u_('\u00ae'), u_('\u00af'),
|
|
u_('\u00b0'), u_('\u00b1'), u_('\u00b2'), u_('\u00b3'), u_('\u00b4'), u_('\u00b5'), u_('\u00b6'), u_('\u00b7'),
|
|
u_('\u00b8'), u_('\u00b9'), u_('\u00ba'), u_('\u00bb'), u_('\u00bc'), u_('\u00bd'), u_('\u00be'), u_('\u00bf'),
|
|
u_('\u00c0'), u_('\u00c1'), u_('\u00c2'), u_('\u00c3'), u_('\u00c4'), u_('\u00c5'), u_('\u00c6'), u_('\u00c7'),
|
|
u_('\u00c8'), u_('\u00c9'), u_('\u00ca'), u_('\u00cb'), u_('\u00cc'), u_('\u00cd'), u_('\u00ce'), u_('\u00cf'),
|
|
u_('\u00d0'), u_('\u00d1'), u_('\u00d2'), u_('\u00d3'), u_('\u00d4'), u_('\u00d5'), u_('\u00d6'), u_('\u00d7'),
|
|
u_('\u00d8'), u_('\u00d9'), u_('\u00da'), u_('\u00db'), u_('\u00dc'), u_('\u00dd'), u_('\u00de'), u_('\u00df'),
|
|
u_('\u00e0'), u_('\u00e1'), u_('\u00e2'), u_('\u00e3'), u_('\u00e4'), u_('\u00e5'), u_('\u00e6'), u_('\u00e7'),
|
|
u_('\u00e8'), u_('\u00e9'), u_('\u00ea'), u_('\u00eb'), u_('\u00ec'), u_('\u00ed'), u_('\u00ee'), u_('\u00ef'),
|
|
u_('\u00f0'), u_('\u00f1'), u_('\u00f2'), u_('\u00f3'), u_('\u00f4'), u_('\u00f5'), u_('\u00f6'), u_('\u00f7'),
|
|
u_('\u00f8'), u_('\u00f9'), u_('\u00fa'), u_('\u00fb'), u_('\u00fc'), u_('\u00fd'), u_('\u00fe'), u_('\u00ff')
|
|
)
|
|
|
|
assert len(_pdfDocEncoding) == 256
|
|
|
|
_pdfDocEncoding_rev = {}
|
|
for i in range(256):
|
|
char = _pdfDocEncoding[i]
|
|
if char == u_("\u0000"):
|
|
continue
|
|
assert char not in _pdfDocEncoding_rev
|
|
_pdfDocEncoding_rev[char] = i
|