This file is indexed.

/usr/lib/python3/dist-packages/pdfrw/pdfreader.py is in python3-pdfrw 0.2-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
# A part of pdfrw (https://github.com/pmaupin/pdfrw)
# Copyright (C) 2006-2015 Patrick Maupin, Austin, Texas
# Copyright (C) 2012-2015 Nerijus Mika
# MIT license -- See LICENSE.txt for details

'''
The PdfReader class reads an entire PDF file into memory and
parses the top-level container objects.  (It does not parse
into streams.)  The object subclasses PdfDict, and the
document pages are stored in a list in the pages attribute
of the object.
'''
import gc
import binascii
import collections
import itertools

from .errors import PdfParseError, log
from .tokens import PdfTokens
from .objects import PdfDict, PdfArray, PdfName, PdfObject, PdfIndirect
from .uncompress import uncompress
from .py23_diffs import convert_load, iteritems


class PdfReader(PdfDict):

    def findindirect(self, objnum, gennum, PdfIndirect=PdfIndirect, int=int):
        ''' Return a previously loaded indirect object, or create
            a placeholder for it.
        '''
        key = int(objnum), int(gennum)
        result = self.indirect_objects.get(key)
        if result is None:
            self.indirect_objects[key] = result = PdfIndirect(key)
            self.deferred_objects.add(key)
            result._loader = self.loadindirect
        return result

    def readarray(self, source, PdfArray=PdfArray):
        ''' Found a [ token.  Parse the tokens after that.
        '''
        specialget = self.special.get
        result = []
        pop = result.pop
        append = result.append

        for value in source:
            if value in ']R':
                if value == ']':
                    break
                generation = pop()
                value = self.findindirect(pop(), generation)
            else:
                func = specialget(value)
                if func is not None:
                    value = func(source)
            append(value)
        return PdfArray(result)

    def readdict(self, source, PdfDict=PdfDict):
        ''' Found a << token.  Parse the tokens after that.
        '''
        specialget = self.special.get
        result = PdfDict()
        next = source.next

        tok = next()
        while tok != '>>':
            if not tok.startswith('/'):
                source.error('Expected PDF /name object')
                tok = next()
                continue
            key = tok
            value = next()
            func = specialget(value)
            if func is not None:
                value = func(source)
                tok = next()
            else:
                tok = next()
                if value.isdigit() and tok.isdigit():
                    tok2 = next()
                    if tok2 != 'R':
                        source.error('Expected "R" following two integers')
                        tok = tok2
                        continue
                    value = self.findindirect(value, tok)
                    tok = next()
            result[key] = value
        return result

    def empty_obj(self, source, PdfObject=PdfObject):
        ''' Some silly git put an empty object in the
            file.  Back up so the caller sees the endobj.
        '''
        source.floc = source.tokstart

    def badtoken(self, source):
        ''' Didn't see that coming.
        '''
        source.exception('Unexpected delimiter')

    def findstream(self, obj, tok, source, len=len):
        ''' Figure out if there is a content stream
            following an object, and return the start
            pointer to the content stream if so.

            (We can't read it yet, because we might not
            know how long it is, because Length might
            be an indirect object.)
        '''

        fdata = source.fdata
        startstream = source.tokstart + len(tok)
        gotcr = fdata[startstream] == '\r'
        startstream += gotcr
        gotlf = fdata[startstream] == '\n'
        startstream += gotlf
        if not gotlf:
            if not gotcr:
                source.error(r'stream keyword not followed by \n')
            else:
                source.warning(r"stream keyword terminated "
                               r"by \r without \n")
        return startstream

    def readstream(self, obj, startstream, source, exact_required=False,
                   streamending='endstream endobj'.split(), int=int):
        fdata = source.fdata
        length = int(obj.Length)
        source.floc = target_endstream = startstream + length
        endit = source.multiple(2)
        obj._stream = fdata[startstream:target_endstream]
        if endit == streamending:
            return

        if exact_required:
            source.exception('Expected endstream endobj')

        # The length attribute does not match the distance between the
        # stream and endstream keywords.

        # TODO:  Extract maxstream from dictionary of object offsets
        # and use rfind instead of find.
        maxstream = len(fdata) - 20
        endstream = fdata.find('endstream', startstream, maxstream)
        source.floc = startstream
        room = endstream - startstream
        if endstream < 0:
            source.error('Could not find endstream')
            return
        if (length == room + 1 and
                fdata[startstream - 2:startstream] == '\r\n'):
            source.warning(r"stream keyword terminated by \r without \n")
            obj._stream = fdata[startstream - 1:target_endstream - 1]
            return
        source.floc = endstream
        if length > room:
            source.error('stream /Length attribute (%d) appears to '
                         'be too big (size %d) -- adjusting',
                         length, room)
            obj.stream = fdata[startstream:endstream]
            return
        if fdata[target_endstream:endstream].rstrip():
            source.error('stream /Length attribute (%d) appears to '
                         'be too small (size %d) -- adjusting',
                         length, room)
            obj.stream = fdata[startstream:endstream]
            return
        endobj = fdata.find('endobj', endstream, maxstream)
        if endobj < 0:
            source.error('Could not find endobj after endstream')
            return
        if fdata[endstream:endobj].rstrip() != 'endstream':
            source.error('Unexpected data between endstream and endobj')
            return
        source.error('Illegal endstream/endobj combination')

    def loadindirect(self, key, PdfDict=PdfDict,
                     isinstance=isinstance):
        result = self.indirect_objects.get(key)
        if not isinstance(result, PdfIndirect):
            return result
        source = self.source
        offset = int(self.source.obj_offsets.get(key, '0'))
        if not offset:
            source.warning("Did not find PDF object %s", key)
            return None

        # Read the object header and validate it
        objnum, gennum = key
        source.floc = offset
        objid = source.multiple(3)
        ok = len(objid) == 3
        ok = ok and objid[0].isdigit() and int(objid[0]) == objnum
        ok = ok and objid[1].isdigit() and int(objid[1]) == gennum
        ok = ok and objid[2] == 'obj'
        if not ok:
            source.floc = offset
            source.next()
            objheader = '%d %d obj' % (objnum, gennum)
            fdata = source.fdata
            offset2 = (fdata.find('\n' + objheader) + 1 or
                       fdata.find('\r' + objheader) + 1)
            if (not offset2 or
                    fdata.find(fdata[offset2 - 1] + objheader, offset2) > 0):
                source.warning("Expected indirect object '%s'", objheader)
                return None
            source.warning("Indirect object %s found at incorrect "
                           "offset %d (expected offset %d)",
                           objheader, offset2, offset)
            source.floc = offset2 + len(objheader)

        # Read the object, and call special code if it starts
        # an array or dictionary
        obj = source.next()
        func = self.special.get(obj)
        if func is not None:
            obj = func(source)

        self.indirect_objects[key] = obj
        self.deferred_objects.remove(key)

        # Mark the object as indirect, and
        # just return it if it is a simple object.
        obj.indirect = key
        tok = source.next()
        if tok == 'endobj':
            return obj

        # Should be a stream.  Either that or it's broken.
        isdict = isinstance(obj, PdfDict)
        if isdict and tok == 'stream':
            self.readstream(obj, self.findstream(obj, tok, source), source)
            return obj

        # Houston, we have a problem, but let's see if it
        # is easily fixable.  Leaving out a space before endobj
        # is apparently an easy mistake to make on generation
        # (Because it won't be noticed unless you are specifically
        # generating an indirect object that doesn't end with any
        # sort of delimiter.)  It is so common that things like
        # okular just handle it.

        if isinstance(obj, PdfObject) and obj.endswith('endobj'):
            source.error('No space or delimiter before endobj')
            obj = PdfObject(obj[:-6])
        else:
            source.error("Expected 'endobj'%s token",
                         isdict and " or 'stream'" or '')
            obj = PdfObject('')

        obj.indirect = key
        self.indirect_objects[key] = obj
        return obj

    def read_all(self):
        deferred = self.deferred_objects
        prev = set()
        while 1:
            new = deferred - prev
            if not new:
                break
            prev |= deferred
            for key in new:
                self.loadindirect(key)

    def uncompress(self):
        self.read_all()
        uncompress(self.indirect_objects.values())

    def load_stream_objects(self, object_streams):
        # read object streams
        objs = []
        for num in object_streams:
            obj = self.findindirect(num, 0).real_value()
            assert obj.Type == '/ObjStm'
            objs.append(obj)

        # read objects from stream
        if objs:
            uncompress(objs)
            for obj in objs:
                objsource = PdfTokens(obj.stream, 0, False)
                snext = objsource.next
                offsets = {}
                firstoffset = int(obj.First)
                num = snext()
                while num.isdigit():
                    offset = int(snext())
                    offsets[int(num)] = firstoffset + offset
                    num = snext()
                for num, offset in iteritems(offsets):
                    # Read the object, and call special code if it starts
                    # an array or dictionary
                    objsource.floc = offset
                    sobj = snext()
                    func = self.special.get(sobj)
                    if func is not None:
                        sobj = func(objsource)

                    key = (num, 0)
                    self.indirect_objects[key] = sobj
                    if key in self.deferred_objects:
                        self.deferred_objects.remove(key)

                    # Mark the object as indirect, and
                    # add it to the list of streams if it starts a stream
                    sobj.indirect = key

    def findxref(self, fdata):
        ''' Find the cross reference section at the end of a file
        '''
        startloc = fdata.rfind('startxref')
        if startloc < 0:
            raise PdfParseError('Did not find "startxref" at end of file')
        source = PdfTokens(fdata, startloc, False, self.verbose)
        tok = source.next()
        assert tok == 'startxref'  # (We just checked this...)
        tableloc = source.next_default()
        if not tableloc.isdigit():
            source.exception('Expected table location')
        if source.next_default().rstrip().lstrip('%') != 'EOF':
            source.exception('Expected %%EOF')
        return startloc, PdfTokens(fdata, int(tableloc), True, self.verbose)

    def parse_xref_stream(self, source, int=int, range=range,
                          enumerate=enumerate, islice=itertools.islice,
                          defaultdict=collections.defaultdict,
                          hexlify=binascii.hexlify):
        ''' Parse (one of) the cross-reference file section(s)
        '''

        def readint(s, lengths):
            lengths = itertools.cycle(lengths)
            offset = 0
            for length in itertools.cycle(lengths):
                next = offset + length
                yield int(hexlify(s[offset:next]), 16) if length else None
                offset = next

        setdefault = source.obj_offsets.setdefault
        next = source.next
        # check for xref stream object
        objid = source.multiple(3)
        ok = len(objid) == 3
        ok = ok and objid[0].isdigit()
        ok = ok and objid[1] == 'obj'
        ok = ok and objid[2] == '<<'
        if not ok:
            source.exception('Expected xref stream start')
        obj = self.readdict(source)
        if obj.Type != PdfName.XRef:
            source.exception('Expected dict type of /XRef')
        tok = next()
        self.readstream(obj, self.findstream(obj, tok, source), source, True)
        if not uncompress([obj], True):
            source.exception('Could not decompress Xref stream')
        num_pairs = obj.Index or PdfArray(['0', obj.Size])
        num_pairs = [int(x) for x in num_pairs]
        num_pairs = zip(num_pairs[0::2], num_pairs[1::2])
        entry_sizes = [int(x) for x in obj.W]
        if len(entry_sizes) != 3:
            source.exception('Invalid entry size')
        object_streams = defaultdict(list)
        get = readint(obj.stream, entry_sizes)
        for objnum, size in num_pairs:
            for cnt in range(size):
                xtype, p1, p2 = islice(get, 3)
                if xtype in (1, None):
                    if p1:
                        setdefault((objnum, p2 or 0), p1)
                elif xtype == 2:
                    object_streams[p1].append((objnum, p2))
                objnum += 1

        obj.private.object_streams = object_streams
        return obj

    def parse_xref_table(self, source, int=int, range=range):
        ''' Parse (one of) the cross-reference file section(s)
        '''
        setdefault = source.obj_offsets.setdefault
        next = source.next
        # plain xref table
        start = source.floc
        try:
            while 1:
                tok = next()
                if tok == 'trailer':
                    return
                startobj = int(tok)
                for objnum in range(startobj, startobj + int(next())):
                    offset = int(next())
                    generation = int(next())
                    inuse = next()
                    if inuse == 'n':
                        if offset != 0:
                            setdefault((objnum, generation), offset)
                    elif inuse != 'f':
                        raise ValueError
        except:
            pass
        try:
            # Table formatted incorrectly.
            # See if we can figure it out anyway.
            end = source.fdata.rindex('trailer', start)
            table = source.fdata[start:end].splitlines()
            for line in table:
                tokens = line.split()
                if len(tokens) == 2:
                    objnum = int(tokens[0])
                elif len(tokens) == 3:
                    offset, generation, inuse = (int(tokens[0]),
                                                 int(tokens[1]), tokens[2])
                    if offset != 0 and inuse == 'n':
                        setdefault((objnum, generation), offset)
                    objnum += 1
                elif tokens:
                    log.error('Invalid line in xref table: %s' %
                              repr(line))
                    raise ValueError
            log.warning('Badly formatted xref table')
            source.floc = end
            next()
        except:
            source.floc = start
            source.exception('Invalid table format')

    def parsexref(self, source):
        ''' Parse (one of) the cross-reference file section(s)
        '''
        next = source.next
        tok = next()
        if tok.isdigit():
            return self.parse_xref_stream(source), True
        elif tok == 'xref':
            self.parse_xref_table(source)
            tok = next()
            if tok != '<<':
                source.exception('Expected "<<" starting catalog')
            return self.readdict(source), False
        else:
            source.exception('Expected "xref" keyword or xref stream object')

    def readpages(self, node):
        pagename = PdfName.Page
        pagesname = PdfName.Pages
        catalogname = PdfName.Catalog
        typename = PdfName.Type
        kidname = PdfName.Kids

        # PDFs can have arbitrarily nested Pages/Page
        # dictionary structures.
        def readnode(node):
            nodetype = node[typename]
            if nodetype == pagename:
                yield node
            elif nodetype == pagesname:
                for node in node[kidname]:
                    for node in readnode(node):
                        yield node
            elif nodetype == catalogname:
                for node in readnode(node[pagesname]):
                    yield node
            else:
                log.error('Expected /Page or /Pages dictionary, got %s' %
                          repr(node))
        try:
            return list(readnode(node))
        except (AttributeError, TypeError) as s:
            log.error('Invalid page tree: %s' % s)
            return []

    def __init__(self, fname=None, fdata=None, decompress=False,
                 disable_gc=True, verbose=True):

        self.private.verbose = verbose
        # Runs a lot faster with GC off.
        disable_gc = disable_gc and gc.isenabled()
        if disable_gc:
            gc.disable()
        try:
            if fname is not None:
                assert fdata is None
                # Allow reading preexisting streams like pyPdf
                if hasattr(fname, 'read'):
                    fdata = fname.read()
                else:
                    try:
                        f = open(fname, 'rb')
                        fdata = f.read()
                        f.close()
                    except IOError:
                        raise PdfParseError('Could not read PDF file %s' %
                                            fname)
                    fdata = convert_load(fdata)
            assert fdata is not None
            if not fdata.startswith('%PDF-'):
                startloc = fdata.find('%PDF-')
                if startloc >= 0:
                    log.warning('PDF header not at beginning of file')
                else:
                    lines = fdata.lstrip().splitlines()
                    if not lines:
                        raise PdfParseError('Empty PDF file!')
                    raise PdfParseError('Invalid PDF header: %s' %
                                        repr(lines[0]))

            self.private.version = fdata[5:8]

            endloc = fdata.rfind('%EOF')
            if endloc < 0:
                raise PdfParseError('EOF mark not found: %s' %
                                    repr(fdata[-20:]))
            endloc += 6
            junk = fdata[endloc:]
            fdata = fdata[:endloc]
            if junk.rstrip('\00').strip():
                log.warning('Extra data at end of file')

            private = self.private
            private.indirect_objects = {}
            private.deferred_objects = set()
            private.special = {'<<': self.readdict,
                               '[': self.readarray,
                               'endobj': self.empty_obj,
                               }
            for tok in r'\ ( ) < > { } ] >> %'.split():
                self.special[tok] = self.badtoken

            startloc, source = self.findxref(fdata)
            private.source = source

            # Find all the xref tables/streams, and
            # then deal with them backwards.
            xref_list = []
            while 1:
                source.obj_offsets = {}
                trailer, is_stream = self.parsexref(source)
                prev = trailer.Prev
                if prev is None:
                    token = source.next()
                    if token != 'startxref' and not xref_list:
                        source.warning('Expected "startxref" '
                                       'at end of xref table')
                    break
                xref_list.append((source.obj_offsets, trailer, is_stream))
                source.floc = int(prev)

            if is_stream:
                self.load_stream_objects(trailer.object_streams)

            while xref_list:
                later_offsets, later_trailer, is_stream = xref_list.pop()
                source.obj_offsets.update(later_offsets)
                if is_stream:
                    trailer.update(later_trailer)
                    self.load_stream_objects(later_trailer.object_streams)
                else:
                    trailer = later_trailer

            trailer.Prev = None

            if (trailer.Version and
                    float(trailer.Version) > float(self.version)):
                self.private.version = trailer.Version

            if is_stream:
                self.Root = trailer.Root
                self.Info = trailer.Info
                self.ID = trailer.ID
                self.Size = trailer.Size
                self.Encrypt = trailer.Encrypt
            else:
                self.update(trailer)

            # self.read_all_indirect(source)
            private.pages = self.readpages(self.Root)
            if decompress:
                self.uncompress()

            # For compatibility with pyPdf
            private.numPages = len(self.pages)
        finally:
            if disable_gc:
                gc.enable()

    # For compatibility with pyPdf
    def getPage(self, pagenum):
        return self.pages[pagenum]