667 lines
18 KiB
Python
Executable File
667 lines
18 KiB
Python
Executable File
#!/usr/bin/env python
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# pdfparser.py, Yusuke Shinyama
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# ver 0.1, Dec 24 2004-
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# ver 0.2, Dec 24 2007
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import sys
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import md5, struct
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stderr = sys.stderr
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from utils import choplist, nunpack
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from arcfour import Arcfour
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from psparser import PSException, PSSyntaxError, PSTypeError, PSEOF, \
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PSLiteral, PSKeyword, PSLiteralTable, PSKeywordTable, \
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literal_name, keyword_name, \
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PSStackParser, STRICT
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def decrypt_rc4(key, objid, genno, data):
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key += struct.pack('<L',objid)[:3]+struct.pack('<L',genno)[:2]
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hash = md5.md5(key)
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key = hash.digest()[:min(len(key),16)]
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return Arcfour(key).process(data)
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## PDF Exceptions
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##
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class PDFException(PSException): pass
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class PDFSyntaxError(PDFException): pass
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class PDFEncryptionError(PDFException): pass
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class PDFPasswordIncorrect(PDFEncryptionError): pass
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class PDFTypeError(PDFException): pass
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class PDFValueError(PDFException): pass
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# some predefined literals and keywords.
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LITERAL_OBJSTM = PSLiteralTable.intern('ObjStm')
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LITERAL_XREF = PSLiteralTable.intern('XRef')
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LITERAL_PAGE = PSLiteralTable.intern('Page')
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LITERAL_PAGES = PSLiteralTable.intern('Pages')
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LITERAL_CATALOG = PSLiteralTable.intern('Catalog')
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LITERAL_CRYPT = PSLiteralTable.intern('Crypt')
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LITERAL_FLATE_DECODE = PSLiteralTable.intern('FlateDecode')
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KEYWORD_R = PSKeywordTable.intern('R')
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KEYWORD_OBJ = PSKeywordTable.intern('obj')
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KEYWORD_ENDOBJ = PSKeywordTable.intern('endobj')
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KEYWORD_STREAM = PSKeywordTable.intern('stream')
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KEYWORD_XREF = PSKeywordTable.intern('xref')
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KEYWORD_STARTXREF = PSKeywordTable.intern('startxref')
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PASSWORD_PADDING = '(\xbfN^Nu\x8aAd\x00NV\xff\xfa\x01\x08..\x00\xb6\xd0h>\x80/\x0c\xa9\xfedSiz'
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## PDFObjRef
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##
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class PDFObjRef:
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def __init__(self, doc, objid, _):
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if objid == 0:
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if STRICT:
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raise PDFValueError('objid cannot be 0.')
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self.doc = doc
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self.objid = objid
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#self.genno = genno # Never used.
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return
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def __repr__(self):
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return '<PDFObjRef:%d>' % (self.objid)
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def resolve(self):
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return self.doc.getobj(self.objid)
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# resolve
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def resolve1(x):
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'''
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Resolve an object. If this is an array or dictionary,
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it may still contains some indirect objects inside.
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'''
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while isinstance(x, PDFObjRef):
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x = x.resolve()
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return x
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def resolve_all(x):
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'''
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Recursively resolve X and all the internals.
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Make sure there is no indirect reference within the nested object.
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This procedure might be slow.
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'''
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while isinstance(x, PDFObjRef):
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x = x.resolve()
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if isinstance(x, list):
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x = [ resolve_all(v) for v in x ]
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elif isinstance(x, dict):
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for (k,v) in x.iteritems():
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x[k] = resolve_all(v)
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return x
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def decipher_all(decipher, objid, genno, x):
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'''
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Recursively decipher X.
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'''
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if isinstance(x, str):
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return decipher(objid, genno, x)
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if isinstance(x, list):
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x = [ decipher_all(decipher, objid, genno, v) for v in x ]
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elif isinstance(x, dict):
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for (k,v) in x.iteritems():
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x[k] = decipher_all(decipher, objid, genno, v)
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return x
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# Type cheking
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def int_value(x):
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x = resolve1(x)
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if not isinstance(x, int):
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if STRICT:
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raise PDFTypeError('integer required: %r' % x)
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return 0
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return x
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def float_value(x):
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x = resolve1(x)
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if not isinstance(x, float):
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if STRICT:
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raise PDFTypeError('float required: %r' % x)
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return 0.0
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return x
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def num_value(x):
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x = resolve1(x)
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if not (isinstance(x, int) or isinstance(x, float)):
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if STRICT:
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raise PDFTypeError('int or float required: %r' % x)
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return 0
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return x
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def str_value(x):
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x = resolve1(x)
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if not isinstance(x, str):
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if STRICT:
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raise PDFTypeError('string required: %r' % x)
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return ''
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return x
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def list_value(x):
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x = resolve1(x)
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if not (isinstance(x, list) or isinstance(x, tuple)):
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if STRICT:
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raise PDFTypeError('list required: %r' % x)
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return []
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return x
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def dict_value(x):
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x = resolve1(x)
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if not isinstance(x, dict):
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if STRICT:
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raise PDFTypeError('dict required: %r' % x)
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return {}
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return x
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def stream_value(x):
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x = resolve1(x)
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if not isinstance(x, PDFStream):
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if STRICT:
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raise PDFTypeError('stream required: %r' % x)
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return PDFStream({}, '')
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return x
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## PDFStream type
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##
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class PDFStream:
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def __init__(self, dic, rawdata, decipher=None):
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self.dic = dic
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self.rawdata = rawdata
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self.decipher = decipher
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self.data = None
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self.objid = None
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self.genno = None
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return
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def set_objid(self, objid, genno):
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self.objid = objid
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self.genno = genno
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return
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def __repr__(self):
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return '<PDFStream: %r>' % (self.dic)
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def decode(self):
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assert self.data == None and self.rawdata != None
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data = self.rawdata
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if self.decipher:
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data = self.decipher(self.objid, self.genno, data)
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if 'Filter' not in self.dic:
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self.data = data
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self.rawdata = None
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return
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filters = self.dic['Filter']
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if not isinstance(filters, list):
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filters = [ filters ]
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for f in filters:
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if f == LITERAL_FLATE_DECODE:
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import zlib
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# will get errors if the document is encrypted.
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data = zlib.decompress(data)
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# apply predictors
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params = self.dic.get('DecodeParms', {})
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if 'Predictor' in params:
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pred = int_value(params['Predictor'])
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if pred:
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if pred != 12:
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raise PDFValueError('Unsupported predictor: %r' % pred)
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if 'Columns' not in params:
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raise PDFValueError('Columns undefined for predictor=12')
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columns = int_value(params['Columns'])
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buf = ''
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ent0 = '\x00' * columns
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for i in xrange(0, len(data), columns+1):
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pred = data[i]
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ent1 = data[i+1:i+1+columns]
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if pred == '\x02':
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ent1 = ''.join( chr((ord(a)+ord(b)) & 255) for (a,b) in zip(ent0,ent1) )
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buf += ent1
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ent0 = ent1
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data = buf
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if f == LITERAL_CRYPT:
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raise PDFEncryptionError
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else:
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if STRICT:
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raise PDFValueError('Invalid filter spec: %r' % f)
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self.data = data
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self.rawdata = None
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return
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def get_data(self):
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if self.data == None:
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self.decode()
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return self.data
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## PDFPage
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##
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class PDFPage:
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def __init__(self, doc, pageidx, attrs):
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self.doc = doc
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self.pageid = pageidx
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self.attrs = dict_value(attrs)
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self.lastmod = self.attrs.get('LastModified')
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self.resources = resolve1(self.attrs['Resources'])
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self.mediabox = resolve1(self.attrs['MediaBox'])
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if 'CropBox' in self.attrs:
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self.cropbox = resolve1(self.attrs['CropBox'])
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else:
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self.cropbox = self.mediabox
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self.rotate = self.attrs.get('Rotate', 0)
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self.annots = self.attrs.get('Annots')
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self.beads = self.attrs.get('B')
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contents = resolve1(self.attrs['Contents'])
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if not isinstance(contents, list):
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contents = [ contents ]
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self.contents = contents
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return
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def __repr__(self):
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return '<PDFPage: Resources=%r, MediaBox=%r>' % (self.resources, self.mediabox)
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## XRefs
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## PDFXRef
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##
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class PDFXRef:
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def __init__(self, parser):
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while 1:
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(_, line) = parser.nextline()
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if not line:
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if STRICT:
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raise PDFSyntaxError('premature eof: %r' % parser)
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break
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line = line.strip()
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f = line.split(' ')
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if len(f) != 2:
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if line != 'trailer':
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if STRICT:
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raise PDFSyntaxError('trailer not found: %r: line=%r' % (parser, line))
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break
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(start, nobjs) = map(long, f)
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self.objid0 = start
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self.objid1 = start+nobjs
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self.offsets = []
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for objid in xrange(start, start+nobjs):
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(_, line) = parser.nextline()
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f = line.strip().split(' ')
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if len(f) != 3:
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if STRICT:
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raise PDFSyntaxError('invalid xref format: %r, line=%r' % (parser, line))
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continue
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(pos, genno, use) = f
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self.offsets.append((int(genno), long(pos), use))
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# read trailer
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(_, dic) = parser.nextobject()
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self.trailer = dict_value(dic)
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return
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def getpos(self, objid):
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if objid < self.objid0 or self.objid1 <= objid:
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raise IndexError(objid)
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(genno, pos, use) = self.offsets[objid-self.objid0]
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if use != 'n':
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if STRICT:
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raise PDFValueError('unused objid=%r' % objid)
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return (None, pos)
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## PDFXRefStream
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##
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class PDFXRefStream:
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def __init__(self, parser):
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(_,objid) = parser.nextobject()
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(_,genno) = parser.nextobject()
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parser.nextobject()
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(_,stream) = parser.nextobject()
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if STRICT:
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if stream.dic['Type'] != LITERAL_XREF:
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raise PDFSyntaxError('invalid stream spec.')
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size = stream.dic['Size']
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(start, nobjs) = stream.dic.get('Index', (0,size))
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self.objid0 = start
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self.objid1 = start+nobjs
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(self.fl1, self.fl2, self.fl3) = stream.dic['W']
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self.data = stream.get_data()
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self.entlen = self.fl1+self.fl2+self.fl3
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self.trailer = stream.dic
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return
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def getpos(self, objid):
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if objid < self.objid0 or self.objid1 <= objid:
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raise IndexError(objid)
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i = self.entlen * (objid-self.objid0)
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ent = self.data[i:i+self.entlen]
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f1 = nunpack(ent[:self.fl1], 1)
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if f1 == 1:
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pos = nunpack(ent[self.fl1:self.fl1+self.fl2])
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genno = nunpack(ent[self.fl1+self.fl2:])
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return (None, pos)
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elif f1 == 2:
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objid = nunpack(ent[self.fl1:self.fl1+self.fl2])
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index = nunpack(ent[self.fl1+self.fl2:])
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return (objid, index)
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## PDFDocument
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##
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INHERITABLE_ATTRS = set(['Resources', 'MediaBox', 'CropBox', 'Rotate'])
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class PDFDocument:
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def __init__(self, debug=0):
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self.debug = debug
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self.xrefs = []
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self.objs = {}
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self.parsed_objs = {}
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self.root = None
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self.catalog = None
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self.parser = None
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self.encryption = None
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self.decipher = None
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return
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def set_parser(self, parser):
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if self.parser: return
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self.parser = parser
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self.xrefs = list(parser.read_xref())
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for xref in self.xrefs:
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trailer = xref.trailer
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if 'Encrypt' in trailer:
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self.encryption = (list_value(trailer['ID']),
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dict_value(trailer['Encrypt']))
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if 'Root' in trailer:
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self.set_root(dict_value(trailer['Root']))
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break
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else:
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raise PDFValueError('no /Root object!')
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if self.encryption:
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self.prepare_cipher()
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return
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def prepare_cipher(self, password=''):
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(docid, param) = self.encryption
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if literal_name(param['Filter']) != 'Standard':
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raise PDFEncryptionError('unknown filter: param=%r' % param)
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V = int_value(param.get('V', 0))
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if not (V == 1 or V == 2):
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raise PDFEncryptionError('unknown algorithm: param=%r' % param)
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length = int_value(param.get('Length', 40)) # Key length (bits)
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O = str_value(param['O'])
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R = int_value(param['R']) # Revision
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if 5 <= R:
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raise PDFEncryptionError('unknown revision: %r' % R)
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U = str_value(param['U'])
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P = int_value(param['P'])
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is_printable = bool(P & 4)
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is_modifiable = bool(P & 8)
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is_extractable = bool(P & 16)
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# Algorithm 3.2
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password = (password+PASSWORD_PADDING)[:32] # 1
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hash = md5.md5(password) # 2
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hash.update(O) # 3
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hash.update(struct.pack('<L', P)) # 4
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hash.update(docid[0]) # 5
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if 4 <= R:
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raise NotImplementedError # 6
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if 3 <= R:
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# 8
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for _ in xrange(50):
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hash = md5.md5(hash.digest()[:length/8])
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key = hash.digest()[:length/8]
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if R == 2:
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# Algorithm 3.4
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u1 = Arcfour(key).process(password)
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elif R == 3:
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# Algorithm 3.5
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hash = md5.md5(PASSWORD_PADDING) # 2
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hash.update(docid[0]) # 3
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x = Arcfour(key).process(hash.digest()[:16]) # 4
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for i in xrange(1,19+1):
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k = ''.join( chr(c ^ i) for c in key )
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x = Arcfour(k).process(x)
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u1 = x+x # 32bytes total
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else:
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raise PDFEncryptionError('unknown revision: %r' % R)
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if R == 2:
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is_authenticated = (u1 == U)
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else:
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is_authenticated = (u1[:16] == U[:16])
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if not is_authenticated:
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raise PDFPasswordIncorrect
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self.decipher = (lambda objid,genno,data: decrypt_rc4(key, objid, genno, data))
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return
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def getobj(self, objid):
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#assert self.xrefs
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if objid in self.objs:
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genno = 0
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obj = self.objs[objid]
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else:
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for xref in self.xrefs:
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try:
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(strmid, index) = xref.getpos(objid)
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break
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except IndexError:
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pass
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else:
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if STRICT:
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raise PDFValueError('Cannot locate objid=%r' % objid)
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return None
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if strmid:
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stream = stream_value(self.getobj(strmid))
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if stream.dic['Type'] != LITERAL_OBJSTM:
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if STRICT:
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raise PDFSyntaxError('Not a stream object: %r' % stream)
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try:
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n = stream.dic['N']
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except KeyError:
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if STRICT:
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raise PDFSyntaxError('N is not defined: %r' % stream)
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n = 0
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if strmid in self.parsed_objs:
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objs = self.parsed_objs[stream]
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else:
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parser = PDFObjStrmParser(self, stream.get_data(), debug=self.debug)
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objs = []
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try:
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while 1:
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(_,obj) = parser.nextobject()
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objs.append(obj)
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except PSEOF:
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pass
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self.parsed_objs[stream] = objs
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genno = 0
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obj = objs[stream.dic['N']*2+index]
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if isinstance(obj, PDFStream):
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obj.set_objid(objid, 0)
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else:
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self.parser.seek(index)
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(_,objid1) = self.parser.nextobject() # objid
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(_,genno) = self.parser.nextobject() # genno
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assert objid1 == objid
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(_,kwd) = self.parser.nextobject()
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if kwd != KEYWORD_OBJ:
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raise PDFSyntaxError('invalid obj spec: offset=%r' % index)
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(_,obj) = self.parser.nextobject()
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if isinstance(obj, PDFStream):
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obj.set_objid(objid, genno)
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if 2 <= self.debug:
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print >>stderr, 'register: objid=%r: %r' % (objid, obj)
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self.objs[objid] = obj
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if self.decipher:
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obj = decipher_all(self.decipher, objid, genno, obj)
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return obj
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def get_pages(self, debug=0):
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#assert self.xrefs
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def search(obj, parent):
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tree = dict_value(obj).copy()
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for (k,v) in parent.iteritems():
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if k in INHERITABLE_ATTRS and k not in tree:
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tree[k] = v
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if tree['Type'] == LITERAL_PAGES:
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if 1 <= debug:
|
|
print >>stderr, 'Pages: Kids=%r' % tree['Kids']
|
|
for c in tree['Kids']:
|
|
for x in search(c, tree):
|
|
yield x
|
|
elif tree['Type'] == LITERAL_PAGE:
|
|
if 1 <= debug:
|
|
print >>stderr, 'Page: %r' % tree
|
|
yield tree
|
|
for (i,tree) in enumerate(search(self.catalog['Pages'], self.catalog)):
|
|
yield PDFPage(self, i, tree)
|
|
return
|
|
|
|
def set_root(self, root):
|
|
self.root = root
|
|
self.catalog = dict_value(self.root)
|
|
if self.catalog['Type'] != LITERAL_CATALOG:
|
|
if STRICT:
|
|
raise PDFValueError('Catalog not found!')
|
|
self.outline = self.catalog.get('Outline')
|
|
return
|
|
|
|
|
|
## PDFParser
|
|
##
|
|
class PDFParser(PSStackParser):
|
|
|
|
def __init__(self, doc, fp, debug=0):
|
|
PSStackParser.__init__(self, fp, debug=debug)
|
|
self.doc = doc
|
|
self.doc.set_parser(self)
|
|
return
|
|
|
|
def __repr__(self):
|
|
return '<PDFParser>'
|
|
|
|
def do_keyword(self, pos, token):
|
|
if token in (KEYWORD_XREF, KEYWORD_STARTXREF):
|
|
self.add_results(*self.pop(1))
|
|
return
|
|
if token == KEYWORD_ENDOBJ:
|
|
self.add_results(*self.pop(4))
|
|
return
|
|
|
|
if token == KEYWORD_R:
|
|
# reference to indirect object
|
|
try:
|
|
((_,objid), (_,genno)) = self.pop(2)
|
|
(objid, genno) = (int(objid), int(genno))
|
|
obj = PDFObjRef(self.doc, objid, genno)
|
|
self.push((pos, obj))
|
|
except PSSyntaxError:
|
|
pass
|
|
return
|
|
|
|
if token == KEYWORD_STREAM:
|
|
# stream object
|
|
((_,dic),) = self.pop(1)
|
|
dic = dict_value(dic)
|
|
try:
|
|
objlen = int_value(dic['Length'])
|
|
except KeyError:
|
|
if STRICT:
|
|
raise PDFValueError('/Length is undefined: %r' % dic)
|
|
objlen = 0
|
|
self.seek(pos)
|
|
(_, line) = self.nextline() # 'stream'
|
|
pos += len(line)
|
|
self.fp.seek(pos)
|
|
data = self.fp.read(objlen)
|
|
self.seek(pos+objlen)
|
|
while 1:
|
|
(linepos, line) = self.nextline()
|
|
if line.startswith('endstream'): break
|
|
objlen += len(line)
|
|
data += line
|
|
if 1 <= self.debug:
|
|
print >>stderr, 'Stream: pos=%d, objlen=%d, dic=%r, data=%r...' % \
|
|
(pos, objlen, dic, data[:10])
|
|
obj = PDFStream(dic, data, self.doc.decipher)
|
|
self.push((pos, obj))
|
|
return
|
|
|
|
# others
|
|
self.push((pos, token))
|
|
return
|
|
|
|
def find_xref(self):
|
|
# find the first xref table
|
|
prev = None
|
|
for line in self.revreadlines():
|
|
line = line.strip()
|
|
if 2 <= self.debug:
|
|
print >>stderr, 'find_xref: %r' % line
|
|
if line == 'startxref': break
|
|
if line:
|
|
prev = line
|
|
else:
|
|
if STRICT:
|
|
raise PDFSyntaxError('startxref not found!')
|
|
prev = 0
|
|
if 1 <= self.debug:
|
|
print >>stderr, 'xref found: pos=%r' % prev
|
|
self.seek(long(prev))
|
|
return
|
|
|
|
# read xref tables and trailers
|
|
def read_xref(self):
|
|
self.find_xref()
|
|
while 1:
|
|
# read xref table
|
|
(linepos, line) = self.nextline()
|
|
if 2 <= self.debug:
|
|
print >>stderr, 'read_xref: %r' % line
|
|
if line[0].isdigit():
|
|
# XRefStream: PDF-1.5
|
|
self.seek(linepos)
|
|
self.reset()
|
|
xref = PDFXRefStream(self)
|
|
else:
|
|
if line.strip() != 'xref':
|
|
if STRICT:
|
|
raise PDFSyntaxError('xref not found: linepos=%d, line=%r' %
|
|
(linepos, line))
|
|
xref = PDFXRef(self)
|
|
yield xref
|
|
trailer = xref.trailer
|
|
if 1 <= self.debug:
|
|
print >>stderr, 'trailer: %r' % trailer
|
|
if 'XRefStm' in trailer:
|
|
self.seek(int_value(trailer['XRefStm']))
|
|
if 'Prev' in trailer:
|
|
# find previous xref
|
|
pos = int_value(trailer['Prev'])
|
|
self.seek(pos)
|
|
if 1 <= self.debug:
|
|
print >>stderr, 'prev trailer: pos=%d' % pos
|
|
else:
|
|
break
|
|
return
|
|
|
|
## PDFObjStrmParser
|
|
##
|
|
class PDFObjStrmParser(PDFParser):
|
|
def __init__(self, doc, data, debug=0):
|
|
try:
|
|
from cStringIO import StringIO
|
|
except ImportError:
|
|
from StringIO import StringIO
|
|
PDFParser.__init__(self, doc, StringIO(data), debug=debug)
|
|
return
|
|
|
|
def flush(self):
|
|
self.add_results(*self.popall())
|
|
return
|