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float64 2.52
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int64 5
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stringlengths 7
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
19,800
|
converter.py
|
pwnieexpress_raspberry_pwn/src/pentest/metagoofil/pdfminer/converter.py
|
#!/usr/bin/env python2
import sys, os.path
from pdfdevice import PDFDevice, PDFTextDevice
from pdffont import PDFUnicodeNotDefined
from pdftypes import LITERALS_DCT_DECODE
from pdfcolor import LITERAL_DEVICE_GRAY, LITERAL_DEVICE_RGB
from layout import LTContainer, LTPage, LTText, LTLine, LTRect, LTCurve
from layout import LTFigure, LTImage, LTChar, LTTextLine
from layout import LTTextBox, LTTextBoxVertical, LTTextGroup
from utils import apply_matrix_pt, mult_matrix
from utils import enc, bbox2str, create_bmp
## PDFLayoutAnalyzer
##
class PDFLayoutAnalyzer(PDFTextDevice):
def __init__(self, rsrcmgr, pageno=1, laparams=None):
PDFTextDevice.__init__(self, rsrcmgr)
self.pageno = pageno
self.laparams = laparams
self._stack = []
return
def begin_page(self, page, ctm):
(x0,y0,x1,y1) = page.mediabox
(x0,y0) = apply_matrix_pt(ctm, (x0,y0))
(x1,y1) = apply_matrix_pt(ctm, (x1,y1))
mediabox = (0, 0, abs(x0-x1), abs(y0-y1))
self.cur_item = LTPage(self.pageno, mediabox)
return
def end_page(self, page):
assert not self._stack
assert isinstance(self.cur_item, LTPage)
if self.laparams is not None:
self.cur_item.analyze(self.laparams)
self.pageno += 1
self.receive_layout(self.cur_item)
return
def begin_figure(self, name, bbox, matrix):
self._stack.append(self.cur_item)
self.cur_item = LTFigure(name, bbox, mult_matrix(matrix, self.ctm))
return
def end_figure(self, _):
fig = self.cur_item
assert isinstance(self.cur_item, LTFigure)
if self.laparams is not None:
self.cur_item.analyze(self.laparams)
self.cur_item = self._stack.pop()
self.cur_item.add(fig)
return
def render_image(self, name, stream):
assert isinstance(self.cur_item, LTFigure)
item = LTImage(name, stream,
(self.cur_item.x0, self.cur_item.y0,
self.cur_item.x1, self.cur_item.y1))
self.cur_item.add(item)
return
def paint_path(self, gstate, stroke, fill, evenodd, path):
shape = ''.join(x[0] for x in path)
if shape == 'ml':
# horizontal/vertical line
(_,x0,y0) = path[0]
(_,x1,y1) = path[1]
(x0,y0) = apply_matrix_pt(self.ctm, (x0,y0))
(x1,y1) = apply_matrix_pt(self.ctm, (x1,y1))
if x0 == x1 or y0 == y1:
self.cur_item.add(LTLine(gstate.linewidth, (x0,y0), (x1,y1)))
return
if shape == 'mlllh':
# rectangle
(_,x0,y0) = path[0]
(_,x1,y1) = path[1]
(_,x2,y2) = path[2]
(_,x3,y3) = path[3]
(x0,y0) = apply_matrix_pt(self.ctm, (x0,y0))
(x1,y1) = apply_matrix_pt(self.ctm, (x1,y1))
(x2,y2) = apply_matrix_pt(self.ctm, (x2,y2))
(x3,y3) = apply_matrix_pt(self.ctm, (x3,y3))
if ((x0 == x1 and y1 == y2 and x2 == x3 and y3 == y0) or
(y0 == y1 and x1 == x2 and y2 == y3 and x3 == x0)):
self.cur_item.add(LTRect(gstate.linewidth, (x0,y0,x2,y2)))
return
# other shapes
pts = []
for p in path:
for i in xrange(1, len(p), 2):
pts.append(apply_matrix_pt(self.ctm, (p[i], p[i+1])))
self.cur_item.add(LTCurve(gstate.linewidth, pts))
return
def render_char(self, matrix, font, fontsize, scaling, rise, cid):
try:
text = font.to_unichr(cid)
assert isinstance(text, unicode), text
except PDFUnicodeNotDefined:
text = self.handle_undefined_char(font, cid)
textwidth = font.char_width(cid)
textdisp = font.char_disp(cid)
item = LTChar(matrix, font, fontsize, scaling, rise, text, textwidth, textdisp)
self.cur_item.add(item)
return item.adv
def handle_undefined_char(self, font, cid):
if self.debug:
print >>sys.stderr, 'undefined: %r, %r' % (font, cid)
return '(cid:%d)' % cid
def receive_layout(self, ltpage):
return
## PDFPageAggregator
##
class PDFPageAggregator(PDFLayoutAnalyzer):
def __init__(self, rsrcmgr, pageno=1, laparams=None):
PDFLayoutAnalyzer.__init__(self, rsrcmgr, pageno=pageno, laparams=laparams)
self.result = None
return
def receive_layout(self, ltpage):
self.result = ltpage
return
def get_result(self):
return self.result
## PDFConverter
##
class PDFConverter(PDFLayoutAnalyzer):
def __init__(self, rsrcmgr, outfp, codec='utf-8', pageno=1, laparams=None):
PDFLayoutAnalyzer.__init__(self, rsrcmgr, pageno=pageno, laparams=laparams)
self.outfp = outfp
self.codec = codec
return
def write_image(self, image):
stream = image.stream
filters = stream.get_filters()
if len(filters) == 1 and filters[0] in LITERALS_DCT_DECODE:
ext = '.jpg'
data = stream.get_rawdata()
elif stream.colorspace is LITERAL_DEVICE_RGB:
ext = '.bmp'
data = create_bmp(stream.get_data(), stream.bits*3, image.width, image.height)
elif stream.colorspace is LITERAL_DEVICE_GRAY:
ext = '.bmp'
data = create_bmp(stream.get_data(), stream.bits, image.width, image.height)
else:
ext = '.img'
data = stream.get_data()
name = image.name+ext
path = os.path.join(self.outdir, name)
fp = file(path, 'wb')
fp.write(data)
fp.close()
return name
## TextConverter
##
class TextConverter(PDFConverter):
def __init__(self, rsrcmgr, outfp, codec='utf-8', pageno=1, laparams=None,
showpageno=False):
PDFConverter.__init__(self, rsrcmgr, outfp, codec=codec, pageno=pageno, laparams=laparams)
self.showpageno = showpageno
return
def write_text(self, text):
self.outfp.write(text.encode(self.codec, 'ignore'))
return
def receive_layout(self, ltpage):
def render(item):
if isinstance(item, LTContainer):
for child in item:
render(child)
elif isinstance(item, LTText):
self.write_text(item.text)
if isinstance(item, LTTextBox):
self.write_text('\n')
if self.showpageno:
self.write_text('Page %s\n' % ltpage.pageid)
render(ltpage)
self.write_text('\f')
return
# Some dummy functions to save memory/CPU when all that is wanted is text.
# This stops all the image and drawing ouput from being recorded and taking
# up RAM.
def render_image(self, name, stream):
pass
def paint_path(self, gstate, stroke, fill, evenodd, path):
pass
## HTMLConverter
##
class HTMLConverter(PDFConverter):
RECT_COLORS = {
#'char': 'green',
'figure': 'yellow',
'textline': 'magenta',
'textbox': 'cyan',
'textgroup': 'red',
'curve': 'black',
'page': 'gray',
}
TEXT_COLORS = {
'textbox': 'blue',
'char': 'black',
}
def __init__(self, rsrcmgr, outfp, codec='utf-8', pageno=1, laparams=None,
scale=1, fontscale=0.7, layoutmode='normal', showpageno=True,
pagemargin=50, outdir=None,
rect_colors={'curve':'black', 'page':'gray'},
text_colors={'char':'black'}):
PDFConverter.__init__(self, rsrcmgr, outfp, codec=codec, pageno=pageno, laparams=laparams)
self.scale = scale
self.fontscale = fontscale
self.layoutmode = layoutmode
self.showpageno = showpageno
self.pagemargin = pagemargin
self.outdir = outdir
self.rect_colors = rect_colors
self.text_colors = text_colors
if self.debug:
self.rect_colors.update(self.RECT_COLORS)
self.text_colors.update(self.TEXT_COLORS)
self._yoffset = self.pagemargin
self._font = None
self._fontstack = []
self.write_header()
return
def write(self, text):
self.outfp.write(text)
return
def write_header(self):
self.write('<html><head>\n')
self.write('<meta http-equiv="Content-Type" content="text/html; charset=%s">\n' % self.codec)
self.write('</head><body>\n')
return
def write_footer(self):
self.write('<div style="position:absolute; top:0px;">Page: %s</div>\n' %
', '.join('<a href="#%s">%s</a>' % (i,i) for i in xrange(1,self.pageno)))
self.write('</body></html>\n')
return
def write_text(self, text):
self.write(enc(text, self.codec))
return
def place_rect(self, color, borderwidth, x, y, w, h):
color = self.rect_colors.get(color)
if color is not None:
self.write('<span style="position:absolute; border: %s %dpx solid; '
'left:%dpx; top:%dpx; width:%dpx; height:%dpx;"></span>\n' %
(color, borderwidth,
x*self.scale, (self._yoffset-y)*self.scale,
w*self.scale, h*self.scale))
return
def place_border(self, color, borderwidth, item):
self.place_rect(color, borderwidth, item.x0, item.y1, item.width, item.height)
return
def place_image(self, item, borderwidth, x, y, w, h):
if self.outdir is not None:
name = self.write_image(item)
self.write('<img src="%s" border="%d" style="position:absolute; left:%dpx; top:%dpx;" '
'width="%d" height="%d" />\n' %
(enc(name), borderwidth,
x*self.scale, (self._yoffset-y)*self.scale,
w*self.scale, h*self.scale))
return
def place_text(self, color, text, x, y, size):
color = self.text_colors.get(color)
if color is not None:
self.write('<span style="position:absolute; color:%s; left:%dpx; top:%dpx; font-size:%dpx;">' %
(color, x*self.scale, (self._yoffset-y)*self.scale, size*self.scale*self.fontscale))
self.write_text(text)
self.write('</span>\n')
return
def begin_textbox(self, color, borderwidth, x, y, w, h, writing_mode):
self._fontstack.append(self._font)
self._font = None
self.write('<div style="position:absolute; border: %s %dpx solid; writing-mode:%s; '
'left:%dpx; top:%dpx; width:%dpx; height:%dpx;">' %
(color, borderwidth, writing_mode,
x*self.scale, (self._yoffset-y)*self.scale,
w*self.scale, h*self.scale))
return
def put_text(self, text, fontname, fontsize):
font = (fontname, fontsize)
if font != self._font:
if self._font is not None:
self.write('</span>')
self.write('<span style="font-family: %s; font-size:%dpx">' %
(fontname, fontsize * self.scale * self.fontscale))
self._font = font
self.write_text(text)
return
def put_newline(self):
self.write('<br>')
return
def end_textbox(self, color):
if self._font is not None:
self.write('</span>')
self._font = self._fontstack.pop()
self.write('</div>')
return
def receive_layout(self, ltpage):
def show_layout(item):
if isinstance(item, LTTextGroup):
self.place_border('textgroup', 1, item)
for child in item:
show_layout(child)
return
def render(item):
if isinstance(item, LTPage):
self._yoffset += item.y1
self.place_border('page', 1, item)
if self.showpageno:
self.write('<div style="position:absolute; top:%dpx;">' %
((self._yoffset-item.y1)*self.scale))
self.write('<a name="%s">Page %s</a></div>\n' % (item.pageid, item.pageid))
for child in item:
render(child)
if item.layout:
show_layout(item.layout)
elif isinstance(item, LTCurve):
self.place_border('curve', 1, item)
elif isinstance(item, LTFigure):
self.place_border('figure', 1, item)
for child in item:
render(child)
elif isinstance(item, LTImage):
self.place_image(item, 1, item.x0, item.y1, item.width, item.height)
else:
if self.layoutmode == 'exact':
if isinstance(item, LTTextLine):
self.place_border('textline', 1, item)
for child in item:
render(child)
elif isinstance(item, LTTextBox):
self.place_border('textbox', 1, item)
self.place_text('textbox', str(item.index+1), item.x0, item.y1, 20)
for child in item:
render(child)
elif isinstance(item, LTChar):
self.place_border('char', 1, item)
self.place_text('char', item.text, item.x0, item.y1, item.size)
else:
if isinstance(item, LTTextLine):
for child in item:
render(child)
if self.layoutmode != 'loose':
self.put_newline()
elif isinstance(item, LTTextBox):
self.begin_textbox('textbox', 1, item.x0, item.y1, item.width, item.height,
item.get_writing_mode())
for child in item:
render(child)
self.end_textbox('textbox')
elif isinstance(item, LTChar):
self.put_text(item.text, item.fontname, item.size)
elif isinstance(item, LTText):
self.write_text(item.text)
return
render(ltpage)
self._yoffset += self.pagemargin
return
def close(self):
self.write_footer()
return
## XMLConverter
##
class XMLConverter(PDFConverter):
def __init__(self, rsrcmgr, outfp, codec='utf-8', pageno=1, laparams=None, outdir=None):
PDFConverter.__init__(self, rsrcmgr, outfp, codec=codec, pageno=pageno, laparams=laparams)
self.outdir = outdir
self.write_header()
return
def write_header(self):
self.outfp.write('<?xml version="1.0" encoding="%s" ?>\n' % self.codec)
self.outfp.write('<pages>\n')
return
def write_footer(self):
self.outfp.write('</pages>\n')
return
def write_text(self, text):
self.outfp.write(enc(text, self.codec))
return
def receive_layout(self, ltpage):
def show_layout(item):
if isinstance(item, LTTextBox):
self.outfp.write('<textbox id="%d" bbox="%s" />\n' %
(item.index, bbox2str(item.bbox)))
elif isinstance(item, LTTextGroup):
self.outfp.write('<textgroup bbox="%s">\n' % bbox2str(item.bbox))
for child in item:
show_layout(child)
self.outfp.write('</textgroup>\n')
return
def render(item):
if isinstance(item, LTPage):
self.outfp.write('<page id="%s" bbox="%s" rotate="%d">\n' %
(item.pageid, bbox2str(item.bbox), item.rotate))
for child in item:
render(child)
if item.layout:
self.outfp.write('<layout>\n')
show_layout(item.layout)
self.outfp.write('</layout>\n')
self.outfp.write('</page>\n')
elif isinstance(item, LTLine):
self.outfp.write('<line linewidth="%d" bbox="%s" />\n' %
(item.linewidth, bbox2str(item.bbox)))
elif isinstance(item, LTRect):
self.outfp.write('<rect linewidth="%d" bbox="%s" />\n' %
(item.linewidth, bbox2str(item.bbox)))
elif isinstance(item, LTCurve):
self.outfp.write('<curve linewidth="%d" bbox="%s" pts="%s"/>\n' %
(item.linewidth, bbox2str(item.bbox), item.get_pts()))
elif isinstance(item, LTFigure):
self.outfp.write('<figure name="%s" bbox="%s">\n' %
(item.name, bbox2str(item.bbox)))
for child in item:
render(child)
self.outfp.write('</figure>\n')
elif isinstance(item, LTTextLine):
self.outfp.write('<textline bbox="%s">\n' % bbox2str(item.bbox))
for child in item:
render(child)
self.outfp.write('</textline>\n')
elif isinstance(item, LTTextBox):
wmode = ''
if isinstance(item, LTTextBoxVertical):
wmode = ' wmode="vertical"'
self.outfp.write('<textbox id="%d" bbox="%s"%s>\n' %
(item.index, bbox2str(item.bbox), wmode))
for child in item:
render(child)
self.outfp.write('</textbox>\n')
elif isinstance(item, LTChar):
self.outfp.write('<text font="%s" bbox="%s" size="%.3f">' %
(enc(item.fontname), bbox2str(item.bbox), item.size))
self.write_text(item.text)
self.outfp.write('</text>\n')
elif isinstance(item, LTText):
self.outfp.write('<text>%s</text>\n' % item.text)
elif isinstance(item, LTImage):
if self.outdir:
name = self.write_image(item)
self.outfp.write('<image src="%s" width="%d" height="%d" />\n' %
(enc(name), item.width, item.height))
else:
self.outfp.write('<image width="%d" height="%d" />\n' %
(item.width, item.height))
else:
assert 0, item
return
render(ltpage)
return
def close(self):
self.write_footer()
return
| 18,982
|
Python
|
.py
| 443
| 30.250564
| 107
| 0.534579
|
pwnieexpress/raspberry_pwn
| 1,024
| 184
| 8
|
GPL-3.0
|
9/5/2024, 5:12:22 PM (Europe/Amsterdam)
|
19,801
|
pdfparser.py
|
pwnieexpress_raspberry_pwn/src/pentest/metagoofil/pdfminer/pdfparser.py
|
#!/usr/bin/env python2
import sys
import re
import struct
try:
import hashlib as md5
except ImportError:
import md5
try:
from cStringIO import StringIO
except ImportError:
from StringIO import StringIO
from psparser import PSStackParser
from psparser import PSSyntaxError, PSEOF
from psparser import literal_name
from psparser import LIT, KWD, STRICT
from pdftypes import PDFException, PDFTypeError, PDFNotImplementedError
from pdftypes import PDFStream, PDFObjRef
from pdftypes import resolve1, decipher_all
from pdftypes import int_value, float_value, num_value
from pdftypes import str_value, list_value, dict_value, stream_value
from arcfour import Arcfour
from utils import choplist, nunpack
from utils import decode_text, ObjIdRange
## Exceptions
##
class PDFSyntaxError(PDFException): pass
class PDFNoValidXRef(PDFSyntaxError): pass
class PDFNoOutlines(PDFException): pass
class PDFDestinationNotFound(PDFException): pass
class PDFEncryptionError(PDFException): pass
class PDFPasswordIncorrect(PDFEncryptionError): pass
# some predefined literals and keywords.
LITERAL_OBJSTM = LIT('ObjStm')
LITERAL_XREF = LIT('XRef')
LITERAL_PAGE = LIT('Page')
LITERAL_PAGES = LIT('Pages')
LITERAL_CATALOG = LIT('Catalog')
## XRefs
##
class PDFBaseXRef(object):
def get_trailer(self):
raise NotImplementedError
def get_objids(self):
return []
def get_pos(self, objid):
raise KeyError(objid)
## PDFXRef
##
class PDFXRef(PDFBaseXRef):
def __init__(self):
self.offsets = {}
self.trailer = {}
return
def load(self, parser, debug=0):
while 1:
try:
(pos, line) = parser.nextline()
if not line.strip(): continue
except PSEOF:
raise PDFNoValidXRef('Unexpected EOF - file corrupted?')
if not line:
raise PDFNoValidXRef('Premature eof: %r' % parser)
if line.startswith('trailer'):
parser.seek(pos)
break
f = line.strip().split(' ')
if len(f) != 2:
raise PDFNoValidXRef('Trailer not found: %r: line=%r' % (parser, line))
try:
(start, nobjs) = map(long, f)
except ValueError:
raise PDFNoValidXRef('Invalid line: %r: line=%r' % (parser, line))
for objid in xrange(start, start+nobjs):
try:
(_, line) = parser.nextline()
except PSEOF:
raise PDFNoValidXRef('Unexpected EOF - file corrupted?')
f = line.strip().split(' ')
if len(f) != 3:
raise PDFNoValidXRef('Invalid XRef format: %r, line=%r' % (parser, line))
(pos, genno, use) = f
if use != 'n': continue
self.offsets[objid] = (int(genno), long(pos))
if 1 <= debug:
print >>sys.stderr, 'xref objects:', self.offsets
self.load_trailer(parser)
return
KEYWORD_TRAILER = KWD('trailer')
def load_trailer(self, parser):
try:
(_,kwd) = parser.nexttoken()
assert kwd is self.KEYWORD_TRAILER
(_,dic) = parser.nextobject()
except PSEOF:
x = parser.pop(1)
if not x:
raise PDFNoValidXRef('Unexpected EOF - file corrupted')
(_,dic) = x[0]
self.trailer.update(dict_value(dic))
return
PDFOBJ_CUE = re.compile(r'^(\d+)\s+(\d+)\s+obj\b')
def load_fallback(self, parser, debug=0):
parser.seek(0)
while 1:
try:
(pos, line) = parser.nextline()
except PSEOF:
break
if line.startswith('trailer'):
parser.seek(pos)
self.load_trailer(parser)
if 1 <= debug:
print >>sys.stderr, 'trailer: %r' % self.get_trailer()
break
m = self.PDFOBJ_CUE.match(line)
if not m: continue
(objid, genno) = m.groups()
self.offsets[int(objid)] = (0, pos)
return
def get_trailer(self):
return self.trailer
def get_objids(self):
return self.offsets.iterkeys()
def get_pos(self, objid):
try:
(genno, pos) = self.offsets[objid]
except KeyError:
raise
return (None, pos)
## PDFXRefStream
##
class PDFXRefStream(PDFBaseXRef):
def __init__(self):
self.data = None
self.entlen = None
self.fl1 = self.fl2 = self.fl3 = None
self.objid_ranges = []
return
def __repr__(self):
return '<PDFXRefStream: fields=%d,%d,%d>' % (self.fl1, self.fl2, self.fl3)
def load(self, parser, debug=0):
(_,objid) = parser.nexttoken() # ignored
(_,genno) = parser.nexttoken() # ignored
(_,kwd) = parser.nexttoken()
(_,stream) = parser.nextobject()
if not isinstance(stream, PDFStream) or stream['Type'] is not LITERAL_XREF:
raise PDFNoValidXRef('Invalid PDF stream spec.')
size = stream['Size']
index_array = stream.get('Index', (0,size))
if len(index_array) % 2 != 0:
raise PDFSyntaxError('Invalid index number')
self.objid_ranges.extend( ObjIdRange(start, nobjs)
for (start,nobjs) in choplist(2, index_array) )
(self.fl1, self.fl2, self.fl3) = stream['W']
self.data = stream.get_data()
self.entlen = self.fl1+self.fl2+self.fl3
self.trailer = stream.attrs
if 1 <= debug:
print >>sys.stderr, ('xref stream: objid=%s, fields=%d,%d,%d' %
(', '.join(map(repr, self.objid_ranges)),
self.fl1, self.fl2, self.fl3))
return
def get_trailer(self):
return self.trailer
def get_objids(self):
for objid_range in self.objid_ranges:
for x in xrange(objid_range.get_start_id(), objid_range.get_end_id()+1):
yield x
return
def get_pos(self, objid):
offset = 0
found = False
for objid_range in self.objid_ranges:
if objid >= objid_range.get_start_id() and objid <= objid_range.get_end_id():
offset += objid - objid_range.get_start_id()
found = True
break
else:
offset += objid_range.get_nobjs()
if not found: raise KeyError(objid)
i = self.entlen * offset
ent = self.data[i:i+self.entlen]
f1 = nunpack(ent[:self.fl1], 1)
if f1 == 1:
pos = nunpack(ent[self.fl1:self.fl1+self.fl2])
genno = nunpack(ent[self.fl1+self.fl2:])
return (None, pos)
elif f1 == 2:
objid = nunpack(ent[self.fl1:self.fl1+self.fl2])
index = nunpack(ent[self.fl1+self.fl2:])
return (objid, index)
# this is a free object
raise KeyError(objid)
## PDFPage
##
class PDFPage(object):
"""An object that holds the information about a page.
A PDFPage object is merely a convenience class that has a set
of keys and values, which describe the properties of a page
and point to its contents.
Attributes:
doc: a PDFDocument object.
pageid: any Python object that can uniquely identify the page.
attrs: a dictionary of page attributes.
contents: a list of PDFStream objects that represents the page content.
lastmod: the last modified time of the page.
resources: a list of resources used by the page.
mediabox: the physical size of the page.
cropbox: the crop rectangle of the page.
rotate: the page rotation (in degree).
annots: the page annotations.
beads: a chain that represents natural reading order.
"""
def __init__(self, doc, pageid, attrs):
"""Initialize a page object.
doc: a PDFDocument object.
pageid: any Python object that can uniquely identify the page.
attrs: a dictionary of page attributes.
"""
self.doc = doc
self.pageid = pageid
self.attrs = dict_value(attrs)
self.lastmod = resolve1(self.attrs.get('LastModified'))
self.resources = resolve1(self.attrs['Resources'])
self.mediabox = resolve1(self.attrs['MediaBox'])
if 'CropBox' in self.attrs:
self.cropbox = resolve1(self.attrs['CropBox'])
else:
self.cropbox = self.mediabox
self.rotate = (self.attrs.get('Rotate', 0)+360) % 360
self.annots = self.attrs.get('Annots')
self.beads = self.attrs.get('B')
if 'Contents' in self.attrs:
contents = resolve1(self.attrs['Contents'])
else:
contents = []
if not isinstance(contents, list):
contents = [ contents ]
self.contents = contents
return
def __repr__(self):
return '<PDFPage: Resources=%r, MediaBox=%r>' % (self.resources, self.mediabox)
## PDFDocument
##
class PDFDocument(object):
"""PDFDocument object represents a PDF document.
Since a PDF file can be very big, normally it is not loaded at
once. So PDF document has to cooperate with a PDF parser in order to
dynamically import the data as processing goes.
Typical usage:
doc = PDFDocument()
doc.set_parser(parser)
doc.initialize(password)
obj = doc.getobj(objid)
"""
debug = 0
def __init__(self, caching=True):
self.caching = caching
self.xrefs = []
self.info = []
self.catalog = None
self.encryption = None
self.decipher = None
self._parser = None
self._cached_objs = {}
self._parsed_objs = {}
return
def set_parser(self, parser):
"Set the document to use a given PDFParser object."
if self._parser: return
self._parser = parser
# Retrieve the information of each header that was appended
# (maybe multiple times) at the end of the document.
self.xrefs = parser.read_xref()
for xref in self.xrefs:
trailer = xref.get_trailer()
if not trailer: continue
# If there's an encryption info, remember it.
if 'Encrypt' in trailer:
#assert not self.encryption
self.encryption = (list_value(trailer['ID']),
dict_value(trailer['Encrypt']))
if 'Info' in trailer:
self.info.append(dict_value(trailer['Info']))
if 'Root' in trailer:
# Every PDF file must have exactly one /Root dictionary.
self.catalog = dict_value(trailer['Root'])
break
else:
raise PDFSyntaxError('No /Root object! - Is this really a PDF?')
if self.catalog.get('Type') is not LITERAL_CATALOG:
if STRICT:
raise PDFSyntaxError('Catalog not found!')
return
# initialize(password='')
# Perform the initialization with a given password.
# This step is mandatory even if there's no password associated
# with the document.
PASSWORD_PADDING = '(\xbfN^Nu\x8aAd\x00NV\xff\xfa\x01\x08..\x00\xb6\xd0h>\x80/\x0c\xa9\xfedSiz'
def initialize(self, password=''):
if not self.encryption:
self.is_printable = self.is_modifiable = self.is_extractable = True
return
(docid, param) = self.encryption
if literal_name(param.get('Filter')) != 'Standard':
raise PDFEncryptionError('Unknown filter: param=%r' % param)
V = int_value(param.get('V', 0))
if not (V == 1 or V == 2):
raise PDFEncryptionError('Unknown algorithm: param=%r' % param)
length = int_value(param.get('Length', 40)) # Key length (bits)
O = str_value(param['O'])
R = int_value(param['R']) # Revision
if 5 <= R:
raise PDFEncryptionError('Unknown revision: %r' % R)
U = str_value(param['U'])
P = int_value(param['P'])
self.is_printable = bool(P & 4)
self.is_modifiable = bool(P & 8)
self.is_extractable = bool(P & 16)
# Algorithm 3.2
password = (password+self.PASSWORD_PADDING)[:32] # 1
hash = md5.md5(password) # 2
hash.update(O) # 3
hash.update(struct.pack('<l', P)) # 4
hash.update(docid[0]) # 5
if 4 <= R:
# 6
raise PDFNotImplementedError('Revision 4 encryption is currently unsupported')
if 3 <= R:
# 8
for _ in xrange(50):
hash = md5.md5(hash.digest()[:length/8])
key = hash.digest()[:length/8]
if R == 2:
# Algorithm 3.4
u1 = Arcfour(key).process(self.PASSWORD_PADDING)
elif R == 3:
# Algorithm 3.5
hash = md5.md5(self.PASSWORD_PADDING) # 2
hash.update(docid[0]) # 3
x = Arcfour(key).process(hash.digest()[:16]) # 4
for i in xrange(1,19+1):
k = ''.join( chr(ord(c) ^ i) for c in key )
x = Arcfour(k).process(x)
u1 = x+x # 32bytes total
if R == 2:
is_authenticated = (u1 == U)
else:
is_authenticated = (u1[:16] == U[:16])
if not is_authenticated:
raise PDFPasswordIncorrect
self.decrypt_key = key
self.decipher = self.decrypt_rc4 # XXX may be AES
return
def decrypt_rc4(self, objid, genno, data):
key = self.decrypt_key + struct.pack('<L',objid)[:3]+struct.pack('<L',genno)[:2]
hash = md5.md5(key)
key = hash.digest()[:min(len(key),16)]
return Arcfour(key).process(data)
KEYWORD_OBJ = KWD('obj')
def getobj(self, objid):
if not self.xrefs:
raise PDFException('PDFDocument is not initialized')
if 2 <= self.debug:
print >>sys.stderr, 'getobj: objid=%r' % (objid)
if objid in self._cached_objs:
genno = 0
obj = self._cached_objs[objid]
else:
for xref in self.xrefs:
try:
(strmid, index) = xref.get_pos(objid)
break
except KeyError:
pass
else:
if STRICT:
raise PDFSyntaxError('Cannot locate objid=%r' % objid)
# return null for a nonexistent reference.
return None
if strmid:
stream = stream_value(self.getobj(strmid))
if stream.get('Type') is not LITERAL_OBJSTM:
if STRICT:
raise PDFSyntaxError('Not a stream object: %r' % stream)
try:
n = stream['N']
except KeyError:
if STRICT:
raise PDFSyntaxError('N is not defined: %r' % stream)
n = 0
if strmid in self._parsed_objs:
objs = self._parsed_objs[strmid]
else:
parser = PDFStreamParser(stream.get_data())
parser.set_document(self)
objs = []
try:
while 1:
(_,obj) = parser.nextobject()
objs.append(obj)
except PSEOF:
pass
if self.caching:
self._parsed_objs[strmid] = objs
genno = 0
i = n*2+index
try:
obj = objs[i]
except IndexError:
raise PDFSyntaxError('Invalid object number: objid=%r' % (objid))
if isinstance(obj, PDFStream):
obj.set_objid(objid, 0)
else:
self._parser.seek(index)
(_,objid1) = self._parser.nexttoken() # objid
(_,genno) = self._parser.nexttoken() # genno
(_,kwd) = self._parser.nexttoken()
# #### hack around malformed pdf files
#assert objid1 == objid, (objid, objid1)
if objid1 != objid:
x = []
while kwd is not self.KEYWORD_OBJ:
(_,kwd) = self._parser.nexttoken()
x.append(kwd)
if x:
objid1 = x[-2]
genno = x[-1]
# #### end hack around malformed pdf files
if kwd is not self.KEYWORD_OBJ:
raise PDFSyntaxError('Invalid object spec: offset=%r' % index)
try:
(_,obj) = self._parser.nextobject()
if isinstance(obj, PDFStream):
obj.set_objid(objid, genno)
except PSEOF:
return None
if 2 <= self.debug:
print >>sys.stderr, 'register: objid=%r: %r' % (objid, obj)
if self.caching:
self._cached_objs[objid] = obj
if self.decipher:
obj = decipher_all(self.decipher, objid, genno, obj)
return obj
INHERITABLE_ATTRS = set(['Resources', 'MediaBox', 'CropBox', 'Rotate'])
def get_pages(self):
if not self.xrefs:
raise PDFException('PDFDocument is not initialized')
def search(obj, parent):
if isinstance(obj, int):
objid = obj
tree = dict_value(self.getobj(objid)).copy()
else:
objid = obj.objid
tree = dict_value(obj).copy()
for (k,v) in parent.iteritems():
if k in self.INHERITABLE_ATTRS and k not in tree:
tree[k] = v
if tree.get('Type') is LITERAL_PAGES and 'Kids' in tree:
if 1 <= self.debug:
print >>sys.stderr, 'Pages: Kids=%r' % tree['Kids']
for c in list_value(tree['Kids']):
for x in search(c, tree):
yield x
elif tree.get('Type') is LITERAL_PAGE:
if 1 <= self.debug:
print >>sys.stderr, 'Page: %r' % tree
yield (objid, tree)
if 'Pages' not in self.catalog: return
for (pageid,tree) in search(self.catalog['Pages'], self.catalog):
yield PDFPage(self, pageid, tree)
return
def get_outlines(self):
if 'Outlines' not in self.catalog:
raise PDFNoOutlines
def search(entry, level):
entry = dict_value(entry)
if 'Title' in entry:
if 'A' in entry or 'Dest' in entry:
title = decode_text(str_value(entry['Title']))
dest = entry.get('Dest')
action = entry.get('A')
se = entry.get('SE')
yield (level, title, dest, action, se)
if 'First' in entry and 'Last' in entry:
for x in search(entry['First'], level+1):
yield x
if 'Next' in entry:
for x in search(entry['Next'], level):
yield x
return
return search(self.catalog['Outlines'], 0)
def lookup_name(self, cat, key):
try:
names = dict_value(self.catalog['Names'])
except (PDFTypeError, KeyError):
raise KeyError((cat,key))
# may raise KeyError
d0 = dict_value(names[cat])
def lookup(d):
if 'Limits' in d:
(k1,k2) = list_value(d['Limits'])
if key < k1 or k2 < key: return None
if 'Names' in d:
objs = list_value(d['Names'])
names = dict(choplist(2, objs))
return names[key]
if 'Kids' in d:
for c in list_value(d['Kids']):
v = lookup(dict_value(c))
if v: return v
raise KeyError((cat,key))
return lookup(d0)
def get_dest(self, name):
try:
# PDF-1.2 or later
obj = self.lookup_name('Dests', name)
except KeyError:
# PDF-1.1 or prior
if 'Dests' not in self.catalog:
raise PDFDestinationNotFound(name)
d0 = dict_value(self.catalog['Dests'])
if name not in d0:
raise PDFDestinationNotFound(name)
obj = d0[name]
return obj
## PDFParser
##
class PDFParser(PSStackParser):
"""
PDFParser fetch PDF objects from a file stream.
It can handle indirect references by referring to
a PDF document set by set_document method.
It also reads XRefs at the end of every PDF file.
Typical usage:
parser = PDFParser(fp)
parser.read_xref()
parser.set_document(doc)
parser.seek(offset)
parser.nextobject()
"""
def __init__(self, fp):
PSStackParser.__init__(self, fp)
self.doc = None
self.fallback = False
return
def set_document(self, doc):
"""Associates the parser with a PDFDocument object."""
self.doc = doc
return
KEYWORD_R = KWD('R')
KEYWORD_NULL = KWD('null')
KEYWORD_ENDOBJ = KWD('endobj')
KEYWORD_STREAM = KWD('stream')
KEYWORD_XREF = KWD('xref')
KEYWORD_STARTXREF = KWD('startxref')
def do_keyword(self, pos, token):
"""Handles PDF-related keywords."""
if token in (self.KEYWORD_XREF, self.KEYWORD_STARTXREF):
self.add_results(*self.pop(1))
elif token is self.KEYWORD_ENDOBJ:
self.add_results(*self.pop(4))
elif token is self.KEYWORD_NULL:
# null object
self.push((pos, None))
elif token is self.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
elif token is self.KEYWORD_STREAM:
# stream object
((_,dic),) = self.pop(1)
dic = dict_value(dic)
objlen = 0
if not self.fallback:
try:
objlen = int_value(dic['Length'])
except KeyError:
if STRICT:
raise PDFSyntaxError('/Length is undefined: %r' % dic)
self.seek(pos)
try:
(_, line) = self.nextline() # 'stream'
except PSEOF:
if STRICT:
raise PDFSyntaxError('Unexpected EOF')
return
pos += len(line)
self.fp.seek(pos)
data = self.fp.read(objlen)
self.seek(pos+objlen)
while 1:
try:
(linepos, line) = self.nextline()
except PSEOF:
if STRICT:
raise PDFSyntaxError('Unexpected EOF')
break
if 'endstream' in line:
i = line.index('endstream')
objlen += i
data += line[:i]
break
objlen += len(line)
data += line
self.seek(pos+objlen)
# XXX limit objlen not to exceed object boundary
if 2 <= self.debug:
print >>sys.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))
else:
# others
self.push((pos, token))
return
def find_xref(self):
"""Internal function used to locate the first XRef."""
# search the last xref table by scanning the file backwards.
prev = None
for line in self.revreadlines():
line = line.strip()
if 2 <= self.debug:
print >>sys.stderr, 'find_xref: %r' % line
if line == 'startxref': break
if line:
prev = line
else:
raise PDFNoValidXRef('Unexpected EOF')
if 1 <= self.debug:
print >>sys.stderr, 'xref found: pos=%r' % prev
return long(prev)
# read xref table
def read_xref_from(self, start, xrefs):
"""Reads XRefs from the given location."""
self.seek(start)
self.reset()
try:
(pos, token) = self.nexttoken()
except PSEOF:
raise PDFNoValidXRef('Unexpected EOF')
if 2 <= self.debug:
print >>sys.stderr, 'read_xref_from: start=%d, token=%r' % (start, token)
if isinstance(token, int):
# XRefStream: PDF-1.5
self.seek(pos)
self.reset()
xref = PDFXRefStream()
xref.load(self, debug=self.debug)
else:
if token is self.KEYWORD_XREF:
self.nextline()
xref = PDFXRef()
xref.load(self, debug=self.debug)
xrefs.append(xref)
trailer = xref.get_trailer()
if 1 <= self.debug:
print >>sys.stderr, 'trailer: %r' % trailer
if 'XRefStm' in trailer:
pos = int_value(trailer['XRefStm'])
self.read_xref_from(pos, xrefs)
if 'Prev' in trailer:
# find previous xref
pos = int_value(trailer['Prev'])
self.read_xref_from(pos, xrefs)
return
# read xref tables and trailers
def read_xref(self):
"""Reads all the XRefs in the PDF file and returns them."""
xrefs = []
try:
pos = self.find_xref()
self.read_xref_from(pos, xrefs)
except PDFNoValidXRef:
# fallback
if 1 <= self.debug:
print >>sys.stderr, 'no xref, fallback'
self.fallback = True
xref = PDFXRef()
xref.load_fallback(self)
xrefs.append(xref)
return xrefs
## PDFStreamParser
##
class PDFStreamParser(PDFParser):
"""
PDFStreamParser is used to parse PDF content streams
that is contained in each page and has instructions
for rendering the page. A reference to a PDF document is
needed because a PDF content stream can also have
indirect references to other objects in the same document.
"""
def __init__(self, data):
PDFParser.__init__(self, StringIO(data))
return
def flush(self):
self.add_results(*self.popall())
return
def do_keyword(self, pos, token):
if token is self.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
# others
self.push((pos, token))
return
| 27,593
|
Python
|
.py
| 718
| 26.82312
| 99
| 0.535802
|
pwnieexpress/raspberry_pwn
| 1,024
| 184
| 8
|
GPL-3.0
|
9/5/2024, 5:12:22 PM (Europe/Amsterdam)
|
19,802
|
pdftypes.pyc
|
pwnieexpress_raspberry_pwn/src/pentest/metagoofil/pdfminer/pdftypes.pyc
|
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