├── .gitignore
├── LICENSE
├── PCRT.py
├── README.md
├── README_fr.md
└── examples
├── 0707.png
├── IHDR.png
├── append.png
├── corrupt.png
└── new.bin
/.gitignore:
--------------------------------------------------------------------------------
1 | *.sh
2 |
--------------------------------------------------------------------------------
/LICENSE:
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584 | Later license versions may give you additional or different
585 | permissions. However, no additional obligations are imposed on any
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588 |
589 | 15. Disclaimer of Warranty.
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591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
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612 | 17. Interpretation of Sections 15 and 16.
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621 | END OF TERMS AND CONDITIONS
622 |
623 | How to Apply These Terms to Your New Programs
624 |
625 | If you develop a new program, and you want it to be of the greatest
626 | possible use to the public, the best way to achieve this is to make it
627 | free software which everyone can redistribute and change under these terms.
628 |
629 | To do so, attach the following notices to the program. It is safest
630 | to attach them to the start of each source file to most effectively
631 | state the exclusion of warranty; and each file should have at least
632 | the "copyright" line and a pointer to where the full notice is found.
633 |
634 | {one line to give the program's name and a brief idea of what it does.}
635 | Copyright (C) {year} {name of author}
636 |
637 | This program is free software: you can redistribute it and/or modify
638 | it under the terms of the GNU General Public License as published by
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641 |
642 | This program is distributed in the hope that it will be useful,
643 | but WITHOUT ANY WARRANTY; without even the implied warranty of
644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
645 | GNU General Public License for more details.
646 |
647 | You should have received a copy of the GNU General Public License
648 | along with this program. If not, see .
649 |
650 | Also add information on how to contact you by electronic and paper mail.
651 |
652 | If the program does terminal interaction, make it output a short
653 | notice like this when it starts in an interactive mode:
654 |
655 | {project} Copyright (C) {year} {fullname}
656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
657 | This is free software, and you are welcome to redistribute it
658 | under certain conditions; type `show c' for details.
659 |
660 | The hypothetical commands `show w' and `show c' should show the appropriate
661 | parts of the General Public License. Of course, your program's commands
662 | might be different; for a GUI interface, you would use an "about box".
663 |
664 | You should also get your employer (if you work as a programmer) or school,
665 | if any, to sign a "copyright disclaimer" for the program, if necessary.
666 | For more information on this, and how to apply and follow the GNU GPL, see
667 | .
668 |
669 | The GNU General Public License does not permit incorporating your program
670 | into proprietary programs. If your program is a subroutine library, you
671 | may consider it more useful to permit linking proprietary applications with
672 | the library. If this is what you want to do, use the GNU Lesser General
673 | Public License instead of this License. But first, please read
674 | .
675 |
--------------------------------------------------------------------------------
/PCRT.py:
--------------------------------------------------------------------------------
1 | # -*- coding:utf-8 -*-
2 | __author__="sherlly"
3 | __version__="1.1"
4 |
5 | import zlib
6 | import struct
7 | import re
8 | import os
9 | import argparse
10 | import itertools
11 | import platform
12 | import sys
13 |
14 |
15 | if platform.system() == "Windows":
16 | import ctypes
17 | STD_OUTPUT_HANDLE = -11
18 | FOREGROUND_BLUE = 0x09
19 | FOREGROUND_GREEN = 0x0a
20 | FOREGROUND_RED = 0x0c
21 | FOREGROUND_SKYBLUE = 0x0b
22 | std_out_handle = ctypes.windll.kernel32.GetStdHandle(STD_OUTPUT_HANDLE)
23 |
24 | def set_cmd_text_color(color, handle=std_out_handle):
25 | status = ctypes.windll.kernel32.SetConsoleTextAttribute(handle, color)
26 | return status
27 |
28 | def resetColor():
29 | set_cmd_text_color(FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE)
30 |
31 | def printRed(msg):
32 | set_cmd_text_color(FOREGROUND_RED)
33 | sys.stdout.write(msg)
34 | resetColor()
35 |
36 | def printSkyBlue(msg):
37 | set_cmd_text_color(FOREGROUND_SKYBLUE)
38 | sys.stdout.write(msg)
39 | resetColor()
40 |
41 | def printGreen(msg):
42 | set_cmd_text_color(FOREGROUND_GREEN)
43 | sys.stdout.write(msg)
44 | resetColor()
45 |
46 | def str2hex(s):
47 | return s.encode('hex').upper()
48 |
49 | def int2hex(i):
50 | return '0x'+hex(i)[2:].upper()
51 |
52 | def str2num(s,n=0):
53 | if n==4:
54 | return struct.unpack('!I',s)[0]
55 | else:
56 | return eval('0x'+str2hex(s))
57 |
58 | def WriteFile(filename):
59 | if os.path.isfile(filename)==True:
60 | os.remove(filename)
61 | file = open(filename,'wb+')
62 | return file
63 |
64 | def ReadFile(filename):
65 | try:
66 | with open(filename,'rb') as file:
67 | data=file.read()
68 | except IOError,e:
69 | print Termcolor('Error',e[1]+': '+filename)
70 | return -1
71 | return data
72 |
73 |
74 | def Termcolor(flag,sentence):
75 | # check platform
76 | system=platform.system()
77 | if system == 'Linux' or system == 'Darwin':
78 | if flag=='Notice':
79 | return "\033[0;34m[%s]\033[0m %s" % (flag,sentence)
80 | elif flag=='Detected':
81 | return "\033[0;32m[%s]\033[0m %s" % (flag,sentence)
82 | elif flag=='Error' or flag == 'Warning' or flag == 'Failed':
83 | return "\033[0;31m[%s]\033[0m %s" % (flag,sentence)
84 | elif system=='Windows':
85 | try:
86 | import ctypes
87 | if flag=='Notice':
88 | printSkyBlue('[%s] '%flag)
89 | return sentence
90 | elif flag=='Detected':
91 | printGreen('[%s] '%flag)
92 | return sentence
93 | elif flag=='Error' or flag == 'Warning' or flag == 'Failed':
94 | printRed('[%s] '%flag)
95 | return sentence
96 | except ImportError,e:
97 | print '[Error]',e
98 | print 'Using the normal color to show...'
99 | return "[%s] %s" % (flag,sentence)
100 | else:
101 | return "[%s] %s" % (flag,sentence)
102 |
103 |
104 |
105 | class PNG(object):
106 |
107 | def __init__(self,in_file='',out_file='output.png',choices='',mode=0):
108 | self.in_file=in_file
109 | self.out_file=out_file
110 | self.choices=choices
111 | self.i_mode=mode
112 |
113 |
114 | def __del__(self):
115 | try:
116 | self.file.close()
117 | except AttributeError:
118 | pass
119 |
120 | def AddPayload(self,name,payload,way):
121 | data=self.LoadPNG()
122 | if data==-1:
123 | return -1
124 | self.file=WriteFile(self.out_file)
125 | if way==1:
126 | # way1:add ancillary
127 | payload_chunk=self.MakeAncillary(name,payload)
128 | pos=data.find('IHDR')
129 | self.file.write(data[:pos+21])
130 | self.file.write(payload_chunk)
131 | self.file.write(data[pos+21:])
132 | elif way==2:
133 | # way2:add critical chunk:IDAT
134 | name='IDAT'
135 | payload_chunk=self.MakeCritical(name,payload)
136 | pos=data.find('IEND')
137 | self.file.write(data[:pos-4])
138 | self.file.write(payload_chunk)
139 | self.file.write(data[pos-4:])
140 |
141 | def MakeCritical(self,name,payload):
142 | print Termcolor('Notice','Payload chunk name: %s'%name)
143 | payload=zlib.compress(payload)
144 | length=len(payload)
145 | crc=zlib.crc32(name+payload) & 0xffffffff
146 | data=struct.pack('!I4s%dsI'%(length),length,name,payload,crc)
147 | return data
148 |
149 | def MakeAncillary(self,name,payload):
150 | if name==None:
151 | name=self.RanAncillaryName()
152 | name=name[0].lower()+name[1:4].upper()
153 | print Termcolor('Notice','Payload chunk name: %s'%name)
154 | length=len(payload)
155 | crc=zlib.crc32(name+payload) & 0xffffffff
156 | data=struct.pack('!I4s%dsI'%(length),length,name,payload,crc)
157 | return data
158 |
159 | def RanAncillaryName(self):
160 | import random,string
161 | key = 'abcdefghijklmnopqrstuvwxyz'
162 | name=''.join(random.sample(string.ascii_lowercase,4))
163 | return name
164 |
165 | def GetPicInfo(self,ihdr=''):
166 | '''
167 | bits: color depth
168 | mode: 0:gray[1] 2:RGB[3] 3:Indexed[1](with palette) 4:grey & alpha[2] 6:RGBA[4]
169 | compression: DEFLATE(LZ77+Huffman)
170 | filter: 0:None 1:sub X-A 2:up X-B 3:average X-(A+B)/2 4:Paeth p = A + B − C
171 | C B D
172 | A X
173 | '''
174 | data=self.LoadPNG()
175 | if data==-1:
176 | return -1
177 | if ihdr=='':
178 | pos,IHDR=self.FindIHDR(data)
179 | if pos==-1:
180 | print Termcolor('Detected','Lost IHDR chunk')
181 | return -1
182 | length=struct.unpack('!I',IHDR[:4])[0]
183 | ihdr=IHDR[8:8+length]
184 |
185 | self.width,self.height,self.bits,self.mode,self.compression,self.filter,self.interlace=struct.unpack('!iiBBBBB',ihdr)
186 |
187 | self.interlace=str2num(ihdr[12])
188 | if self.mode==0 or self.mode==3: # Gray/Index
189 | self.channel=1
190 | elif self.mode==2: # RGB
191 | self.channel=3
192 | elif self.mode==4: #GA
193 | self.channel=2
194 | elif self.mode==6: # RGBA
195 | self.channel=4
196 | else:
197 | self.channel=0
198 |
199 | data=self.LoadPNG()
200 | if data==-1:
201 | return -1
202 | self.content=self.FindAncillary(data)
203 |
204 | def PrintPicInfo(self):
205 | status=self.GetPicInfo()
206 | if status==-1:
207 | return -1
208 |
209 | mode_dict={0:'Grayscale',2:'RGB',3:'Indexed',4:'Grayscale with Alpha',6:'RGB with Alpha'}
210 | compress_dict={0:'Deflate'}
211 | filter_dict={0:'None',1:'Sub',2:'Up',3:'Average',4:'Paeth'}
212 | interlace_dict={0:'Noninterlaced',1:'Adam7 interlaced'}
213 | print '\n-------------------------Image Infomation---------------------------------------'
214 | print 'Image Width: %d\nImage Height: %d\nBit Depth: %d\nChannel: %d'%(self.width,self.height,self.bits,self.channel)
215 | print 'ColorType: %s'%(mode_dict[self.mode])
216 | print 'Interlace: %s\nFilter method: %s\nCompression method: %s'%(interlace_dict[self.interlace],filter_dict[self.filter],compress_dict[self.compression])
217 | print 'Content: '
218 | for k in self.content:
219 | if self.content[k]!=[]:
220 | text_t='\n'.join(self.content[k]).split('\n')
221 | text=''
222 | import re
223 | for t in text_t:
224 | if re.match(r'^[ ]+$',t):
225 | pass
226 | else:
227 | text+='\n'+t
228 | print '%s: '%k,text
229 | print '--------------------------------------------------------------------------------\n'
230 |
231 | def ClearFilter(self,idat,width,height,channel,bits=8):
232 | IDAT=''
233 | if len(idat)==height*width*channel:
234 | return idat
235 | filter_unit=bits/8*channel
236 | for i in range(0,len(idat),width*channel+1):
237 | line_filter=str2num(idat[i])
238 | idat_data=idat[i+1:i+width*channel+1]
239 | if i>=1:
240 | idat_data_u=tmp
241 | else:
242 | idat_data_u=[0]*width*channel
243 |
244 | if line_filter not in [0,1,2,3,4]:
245 | return -1
246 |
247 | if line_filter==0: #None
248 | tmp=list(idat_data)
249 | IDAT+=''.join(tmp)
250 |
251 | elif line_filter==1: #Sub
252 | k=0
253 | tmp=list(idat_data)
254 | for j in range(filter_unit,len(idat_data)):
255 | tmp[j] = chr((ord(idat_data[j]) + ord(tmp[k])) % 256)
256 | k+=1
257 | IDAT+=''.join(tmp)
258 |
259 | elif line_filter==2: # Up
260 | tmp=''
261 | for j in range(len(idat_data)):
262 | tmp += chr((ord(idat_data[j]) + ord(idat_data_u[j])) % 256)
263 | IDAT+=tmp
264 | tmp=list(tmp)
265 |
266 | elif line_filter == 3: # Average
267 | tmp=list(idat_data)
268 | k=-filter_unit
269 | for j in range(len(idat_data)):
270 | if k<0:
271 | a=0
272 | else:
273 | a=ord(tmp[k])
274 | tmp[j] = chr((ord(idat_data[j]) + (a + ord(idat_data_u[j])) / 2) % 256)
275 | k+=1
276 | IDAT+=''.join(tmp)
277 |
278 | elif line_filter == 4: #Paeth
279 | def predictor(a, b, c):
280 | '''a = left, b = above, c = upper left'''
281 | p = a + b -c
282 | pa = abs(p - a)
283 | pb = abs(p - b)
284 | pc = abs(p - c)
285 | if pa <= pb and pa <= pc:
286 | return a
287 | elif pb <= pc:
288 | return b
289 | else:
290 | return c
291 | k=-filter_unit
292 | tmp=list(idat_data)
293 | for j in range(len(idat_data)):
294 | if k<0:
295 | a=c=0
296 | else:
297 | a=ord(tmp[k])
298 | c=ord(idat_data_u[k])
299 | tmp[j] = chr((ord(idat_data[j]) + predictor(a, ord(idat_data_u[j]), c)) % 256 )
300 | k+=1
301 | IDAT+=''.join(tmp)
302 | return IDAT
303 |
304 | def zlib_decrypt(self,data):
305 | # Use in IDAT decompress
306 | z_data=zlib.decompress(data)
307 | return z_data
308 |
309 | def LoadPNG(self):
310 | data=ReadFile(self.in_file)
311 | if data == -1:
312 | return -1
313 | status=self.CheckFormat(data)
314 | if status == -1:
315 | print Termcolor('Warning','The file may be not a PNG image.')
316 | return -1
317 | return data
318 |
319 |
320 | def DecompressPNG(self,data,channel=3,bits=8,width=1,height=1):
321 | # data: array[idat1,idat2,...]
322 | from PIL import Image
323 | IDAT_data=''
324 | for idat in data:
325 | IDAT_data+=idat
326 | z_idat=self.zlib_decrypt(IDAT_data)
327 | length=len(z_idat)
328 |
329 | if width==0 and height == 0:
330 | # bruteforce
331 | import shutil
332 | channel_dict={1:'L',3:'RGB',2:'LA',4:'RGBA'}
333 | PATH='tmp/'
334 | if os.path.isdir(PATH)==True:
335 | shutil.rmtree(PATH)
336 | os.mkdir(PATH)
337 | for bits in [8,16]:
338 | for channel in [4,3,1,2]:
339 | size_list=[]
340 | for i in range(1,length):
341 | if length%i==0:
342 | if (i-1)%(bits/8*channel)==0:
343 | size_list.append((i-1)/(bits/8*channel))
344 | size_list.append(length/i)
345 | if (length/i-1)%(bits/8*channel)==0:
346 | size_list.append((length/i-1)/(bits/8*channel))
347 | size_list.append(i)
348 | for i in range(0,len(size_list),2):
349 | width=size_list[i]
350 | height=size_list[i+1]
351 | tmp=self.ClearFilter(z_idat,width,height,channel,bits)
352 | if tmp!=-1:
353 | img=Image.fromstring(channel_dict[channel],(width,height), tmp)
354 | # img.show()
355 | filename=PATH+'test(%dx%d)_%dbits_%dchannel.png'%(width,height,bits,channel)
356 | img.save(filename)
357 |
358 | # show all possible image
359 | os.startfile(os.getcwd()+'/'+PATH)
360 | # final size
361 | size=raw_input('Input width, height, bits and channel(space to split):').split()
362 | # remove temporary file
363 | shutil.rmtree(PATH)
364 |
365 | width=int(size[0])
366 | height=int(size[1])
367 | bits=int(size[2])
368 | channel=int(size[3])
369 | tmp=self.ClearFilter(z_idat,width,height,channel,bits)
370 | if tmp==-1:
371 | print 'Wrong'
372 | return -1
373 | img=Image.fromstring(channel_dict[channel],(width,height), tmp)
374 | img.save('decompress.png')
375 |
376 | else:
377 | if width==1 and height == 1:
378 | # load PNG config
379 | status=self.GetPicInfo()
380 | if status == -1:
381 | return -1
382 | width=self.width
383 | height=self.height
384 | channel=self.channel
385 | bits=self.bits
386 | else:
387 | pass
388 | z_idat=self.ClearFilter(z_idat,width,height,channel,bits)
389 |
390 | mode_dict={0:'L',2:'RGB',3:'P',4:'LA',6:'RGBA'}
391 | img=Image.fromstring(mode_dict[self.mode],(width,height), z_idat)
392 | img.show()
393 | img.save('zlib.png')
394 |
395 | return 0
396 |
397 |
398 | def FindAncillary(self,data):
399 | ancillary=['cHRM','gAMA','sBIT','PLTE','bKGD','sTER','hIST','iCCP','pHYs','sPLT','sRGB','dSIG','eXIf','iTXt','tEXt','zTXt','tIME','tRNS','oFFs','sCAL','fRAc','gIFg','gIFt','gIFx']
400 | attach_txt=['eXIf','iTXt','tEXt','zTXt']
401 | content={}
402 | for text in attach_txt:
403 | pos=0
404 | content[text]=[]
405 | while pos!=-1:
406 | pos=data.find(text,pos)
407 | if pos!=-1:
408 | length=str2num(data[pos-4:pos])
409 | content[text].append(data[pos+4:pos+4+length])
410 | pos+=1
411 | return content
412 |
413 |
414 | def CheckPNG(self):
415 | data=self.LoadPNG()
416 | if data==-1:
417 | return -1
418 |
419 | self.file=WriteFile(self.out_file)
420 | res=self.CheckHeader(data)
421 | if res == -1:
422 | print '[Finished] PNG check complete'
423 | return -1
424 | res=self.CheckIHDR(data)
425 | if res == -1:
426 | print '[Finished] PNG check complete'
427 | return -1
428 |
429 | res,idat=self.CheckIDAT(data)
430 | if res == -1:
431 | print '[Finished] PNG check complete'
432 | return -1
433 | self.CheckIEND(data)
434 | print '[Finished] PNG check complete'
435 |
436 | '''check complete'''
437 |
438 | if self.choices != '':
439 | choice=self.choices
440 | else:
441 | msg=Termcolor('Notice','Show the repaired image? (y or n) [default:n] ')
442 | choice=raw_input(msg)
443 | if choice == 'y':
444 | try:
445 | from PIL import Image
446 | self.file.close()
447 | img=Image.open(self.out_file)
448 | img.show()
449 | except ImportError,e:
450 | print Termcolor('Error',e)
451 | print "Try 'pip install PIL' to use it"
452 | return 0
453 |
454 | def Checkcrc(self,chunk_type,chunk_data, checksum):
455 | # CRC-32 computed over the chunk type and chunk data, but not the length
456 | calc_crc = zlib.crc32(chunk_type+chunk_data) & 0xffffffff
457 | calc_crc = struct.pack('!I', calc_crc)
458 | if calc_crc != checksum:
459 | return calc_crc
460 | else:
461 | return None
462 |
463 | def CheckFormat(self,data):
464 | png_feature=['PNG','IHDR','IDAT','IEND']
465 | status = [True for p in png_feature if p in data]
466 | if status == []:
467 | return -1
468 | return 0
469 |
470 | def CheckHeader(self,data):
471 | # Header:89 50 4E 47 0D 0A 1A 0A %PNG....
472 | Header=data[:8]
473 | if str2hex(Header)!='89504E470D0A1A0A':
474 | print Termcolor('Detected','Wrong PNG header!')
475 | print 'File header: %s\nCorrect header: 89504E470D0A1A0A'%(str2hex(Header))
476 | if self.choices != '':
477 | choice=self.choices
478 | else:
479 | msg = Termcolor('Notice','Auto fixing? (y or n) [default:y] ')
480 | choice=raw_input(msg)
481 | if choice == 'y' or choice == '':
482 | Header='89504E470D0A1A0A'.decode('hex')
483 | print '[Finished] Now header:%s'%(str2hex(Header))
484 | else:
485 | return -1
486 | else:
487 | print '[Finished] Correct PNG header'
488 | self.file.write(Header)
489 | return 0
490 |
491 | def FindIHDR(self,data):
492 | pos=data.find('IHDR')
493 | if pos == -1:
494 | return -1,-1
495 | idat_begin=data.find('IDAT')
496 | if idat_begin != -1:
497 | IHDR=data[pos-4:idat_begin-4]
498 | else:
499 | IHDR=data[pos-4:pos+21]
500 | return pos,IHDR
501 |
502 | def CheckIHDR(self,data):
503 | # IHDR:length=13(4 bytes)+chunk_type='IHDR'(4 bytes)+chunk_ihdr(length bytes)+crc(4 bytes)
504 | # chunk_ihdr=width(4 bytes)+height(4 bytes)+left(5 bytes)
505 | pos,IHDR=self.FindIHDR(data)
506 | if pos==-1:
507 | print Termcolor('Detected','Lost IHDR chunk')
508 | return -1
509 | length=struct.unpack('!I',IHDR[:4])[0]
510 | chunk_type=IHDR[4:8]
511 | chunk_ihdr=IHDR[8:8+length]
512 |
513 | width,height=struct.unpack('!II',chunk_ihdr[:8])
514 | crc=IHDR[8+length:12+length]
515 | # check crc
516 | calc_crc = self.Checkcrc(chunk_type,chunk_ihdr,crc)
517 | if calc_crc != None:
518 | print Termcolor('Detected','Error IHDR CRC found! (offset: %s)\nchunk crc: %s\ncorrect crc: %s'%(int2hex(pos+4+length),str2hex(crc),str2hex(calc_crc)))
519 | if self.choices != '':
520 | choice=self.choices
521 | else:
522 | msg = Termcolor('Notice','Try fixing it? (y or n) [default:y] ')
523 | choice = raw_input(msg)
524 | if choice == 'y' or choice=='':
525 | if width > height:
526 | # fix height
527 | for h in xrange(height,width):
528 | chunk_ihdr=IHDR[8:12]+struct.pack('!I',h)+IHDR[16:8+length]
529 | if self.Checkcrc(chunk_type,chunk_ihdr,calc_crc) == None:
530 | IHDR=IHDR[:8]+chunk_ihdr+calc_crc
531 | print '[Finished] Successfully fix crc'
532 | break
533 | else:
534 | # fix width
535 | for w in xrange(width,height):
536 | chunk_ihdr=struct.pack('!I',w)+IHDR[12:8+length]
537 | if self.Checkcrc(chunk_type,chunk_ihdr,calc_crc) == None:
538 | IHDR=IHDR[:8]+chunk_ihdr+calc_crc
539 | print '[Finished] Successfully fix crc'
540 | break
541 | else:
542 | print '[Finished] Correct IHDR CRC (offset: %s): %s'% (int2hex(pos+4+length),str2hex(crc))
543 | self.file.write(IHDR)
544 | print '[Finished] IHDR chunk check complete (offset: %s)'%(int2hex(pos-4))
545 |
546 | # get image information
547 | self.GetPicInfo(ihdr=chunk_ihdr)
548 |
549 | def CheckIDAT(self,data):
550 | # IDAT:length(4 bytes)+chunk_type='IDAT'(4 bytes)+chunk_data(length bytes)+crc(4 bytes)
551 | IDAT_table = []
552 | idat_begin = data.find('49444154'.decode('hex'))-4
553 | if idat_begin == -1:
554 | print Termcolor('Detected','Lost all IDAT chunk!')
555 | return -1,''
556 | if self.i_mode == 0:
557 | # fast: assume both chunk length are true
558 | idat_size=struct.unpack('!I',data[idat_begin:idat_begin+4])[0]+12
559 | for i in xrange(idat_begin,len(data)-12,idat_size):
560 | IDAT_table.append(data[i:i+idat_size])
561 | if i < len(data)-12:
562 | # the last IDAT chunk
563 | IDAT_table.append(data[i:-12])
564 | elif self.i_mode == 1:
565 | # slow but safe
566 | pos_IEND=data.find('IEND')
567 | if pos_IEND != -1:
568 | pos_list = [g.start() for g in re.finditer('IDAT',data) if g.start() < pos_IEND]
569 | else:
570 | pos_list = [g.start() for g in re.finditer('IDAT',data)]
571 | for i in range(len(pos_list)):
572 | # split into IDAT
573 | if i+1 == len(pos_list):
574 | # IEND
575 | pos1=pos_list[i]
576 | if pos_IEND != -1:
577 | IDAT_table.append(data[pos1-4:pos_IEND-4])
578 | else:
579 | IDAT_table.append(data[pos1-4:])
580 | break
581 | pos1=pos_list[i]
582 | pos2=pos_list[i+1]
583 | IDAT_table.append(data[pos1-4:pos2-4])
584 |
585 | offset=idat_begin
586 | IDAT_data_table=[]
587 | for IDAT in IDAT_table:
588 | length=struct.unpack('!I',IDAT[:4])[0]
589 | chunk_type=IDAT[4:8]
590 | chunk_data=IDAT[8:-4]
591 | crc=IDAT[-4:]
592 | # check data length
593 | if length != len(chunk_data):
594 | print Termcolor('Detected','Error IDAT chunk data length! (offset: %s)'%(int2hex(offset)))
595 | print 'chunk length:%s\nactual length:%s'%(int2hex(length)[2:],int2hex(len(chunk_data))[2:])
596 | if self.choices != '':
597 | choice=self.choices
598 | else:
599 | msg = Termcolor('Notice','Try fixing it? (y or n) [default:y] ')
600 | choice=raw_input(msg)
601 | if choice == 'y' or choice == '':
602 | print Termcolor('Warning','Only fix because of DOS->Unix conversion')
603 | # error reason:DOS->Unix conversion
604 | chunk_data=self.FixDos2Unix(chunk_type,chunk_data,crc,count=abs(length-len(chunk_data)))
605 | if chunk_data == None:
606 | print Termcolor('Failed','Fixing failed, auto discard this operation...')
607 | chunk_data=IDAT[8:-4]
608 | else:
609 | IDAT=IDAT[:8]+chunk_data+IDAT[-4:]
610 | print '[Finished] Successfully recover IDAT chunk data'
611 | else:
612 | print '[Finished] Correct IDAT chunk data length (offset: %s length: %s)'%(int2hex(offset),int2hex(length)[2:])
613 | # check crc
614 | calc_crc = self.Checkcrc(chunk_type,chunk_data,crc)
615 | if calc_crc != None:
616 | print Termcolor('Detected','Error IDAT CRC found! (offset: %s)\nchunk crc: %s\ncorrect crc: %s'%(int2hex(offset+8+length),str2hex(crc),str2hex(calc_crc)))
617 | if self.choices != '':
618 | choice=self.choices
619 | else:
620 | msg = Termcolor('Notice','Try fixing it? (y or n) [default:y] ')
621 | choice = raw_input(msg)
622 | if choice == 'y' or choice == '':
623 | IDAT=IDAT[:-4]+calc_crc
624 | print '[Finished] Successfully fix crc'
625 |
626 | else:
627 | print '[Finished] Correct IDAT CRC (offset: %s): %s'% (int2hex(offset+8+length),str2hex(crc))
628 |
629 | # write into file
630 | self.file.write(IDAT)
631 | IDAT_data_table.append(chunk_data)
632 | offset+=len(chunk_data)+12
633 | print '[Finished] IDAT chunk check complete (offset: %s)'%(int2hex(idat_begin))
634 | return 0,IDAT_data_table
635 |
636 | def FixDos2Unix(self,chunk_type,chunk_data,crc,count):
637 | pos=-1
638 | pos_list=[]
639 | while True:
640 | pos=chunk_data.find('\x0A',pos+1)
641 | if pos == -1:
642 | break
643 | pos_list.append(pos)
644 | fix='\x0D'
645 | tmp=chunk_data
646 | for pos_all in itertools.combinations(pos_list,count):
647 | i=0
648 | chunk_data=tmp
649 | for pos in pos_all:
650 | chunk_data=chunk_data[:pos+i]+fix+chunk_data[pos+i:]
651 | i+=1
652 | # check crc
653 | if self.Checkcrc(chunk_type,chunk_data,crc) == None:
654 | # fix success
655 | return chunk_data
656 | return None
657 |
658 |
659 | def CheckIEND(self,data):
660 | # IEND:length=0(4 bytes)+chunk_type='IEND'(4 bytes)+crc=AE426082(4 bytes)
661 | standard_IEND='\x00\x00\x00\x00IEND\xae\x42\x60\x82'
662 | pos=data.find('IEND')
663 | if pos == -1:
664 | print Termcolor('Detected','Lost IEND chunk! Try auto fixing...')
665 | IEND=standard_IEND
666 | print '[Finished] Now IEND chunk:%s'%(str2hex(IEND))
667 | else:
668 | IEND=data[pos-4:pos+8]
669 | if IEND != standard_IEND:
670 | print Termcolor('Detected','Error IEND chunk! Try auto fixing...')
671 | IEND=standard_IEND
672 | print '[Finished] Now IEND chunk:%s'%(str2hex(IEND))
673 | else:
674 | print '[Finished] Correct IEND chunk'
675 | if data[pos+8:] != '':
676 | print Termcolor('Detected','Some data (length: %d) append in the end (%s)'%(len(data[pos+8:]),data[pos+8:pos+18]))
677 | while True:
678 | msg = Termcolor('Notice','Try extracting them in: <1>File <2>Terminal <3>Quit [default:3] ')
679 | choice=raw_input(msg)
680 | if choice == '1':
681 | filename = raw_input('[File] Input the file name: ')
682 | file=WriteFile(filename)
683 | file.write(data[pos+8:])
684 | print '[Finished] Successfully write in %s'%(filename)
685 | os.startfile(os.getcwd())
686 | elif choice == '2':
687 | print 'data:',data[pos+8:]
688 | print 'hex(data):',data[pos+8:].encode('hex')
689 | elif choice == '3' or choice == '':
690 | break
691 | else:
692 | print Termcolor('Error','Illegal choice. Try again.')
693 |
694 | self.file.write(IEND)
695 | print '[Finished] IEND chunk check complete'
696 | return 0
697 |
698 | if __name__=='__main__':
699 |
700 | msg="""
701 | ____ ____ ____ _____
702 | | _ \ / ___| _ \_ _|
703 | | |_) | | | |_) || |
704 | | __/| |___| _ < | |
705 | |_| \____|_| \_\|_|
706 |
707 | PNG Check & Repair Tool
708 |
709 | Project address: https://github.com/sherlly/PCRT
710 | Author: sherlly
711 | Version: %s
712 | """%(__version__)
713 |
714 | parser = argparse.ArgumentParser()
715 | parser.add_argument('-q', '--quiet',action='store_true', help="don't show the banner infomation")
716 | parser.add_argument('-y', '--yes',help='auto choose yes',action='store_true')
717 | parser.add_argument('-v', '--verbose', help='use the safe way to recover',action='store_true')
718 | parser.add_argument('-m', '--message',help='show the image information',action='store_true')
719 | parser.add_argument('-n', '--name', help="payload name [Default: random]")
720 | parser.add_argument('-p', '--payload', help="payload to hide")
721 | parser.add_argument('-w', '--way', type=int, default=1, help="payload chunk: [1]: ancillary [2]: critical [Default:1]")
722 |
723 | parser.add_argument('-d', '--decompress', help="decompress zlib data file name")
724 |
725 | parser.add_argument('-i', '--input', help='Input file name (*.png) [Select from terminal]')
726 | parser.add_argument('-f', '--file', help='Input file name (*.png) [Select from window]',action='store_true')
727 | parser.add_argument('-o', '--output', default='output.png', help='Output repaired file name [Default: output.png]')
728 | args = parser.parse_args()
729 |
730 | in_file=args.input
731 | out_file=args.output
732 | payload=args.payload
733 | payload_name=args.name
734 | z_file=args.decompress
735 |
736 | if args.quiet != True:
737 | print msg
738 |
739 | if z_file!=None:
740 | z_data=ReadFile(z_file)
741 | my_png=PNG()
742 | my_png.DecompressPNG(z_data,width=0,height=0)
743 | else:
744 | if args.verbose == True:
745 | mode=1
746 | else:
747 | mode=0
748 | if args.file == True:
749 | try:
750 | import Tkinter
751 | import tkFileDialog
752 | root=Tkinter.Tk()
753 | in_file=tkFileDialog.askopenfilename()
754 | root.destroy()
755 | if args.yes == True:
756 | my_png=PNG(in_file,out_file,choices='y',mode=mode)
757 | else:
758 | my_png=PNG(in_file,out_file,mode=mode)
759 | if args.message == True:
760 | my_png.PrintPicInfo()
761 | elif payload != None:
762 | way=args.way
763 | my_png.AddPayload(payload_name,payload,way)
764 | else:
765 | my_png.CheckPNG()
766 | except ImportError,e:
767 | print Termcolor('Error',e)
768 | print "Try 'pip install Tkinter' to use it"
769 | elif in_file!=None:
770 | if args.yes == True:
771 | my_png=PNG(in_file,out_file,choices='y',mode=mode)
772 | else:
773 | my_png=PNG(in_file,out_file,mode=mode)
774 | if args.message == True:
775 | my_png.PrintPicInfo()
776 | elif payload != None:
777 | way=args.way
778 | my_png.AddPayload(payload_name,payload,way)
779 | else:
780 | my_png.CheckPNG()
781 | else:
782 | parser.print_help()
783 |
784 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # PCRT (PNG Check & Repair Tool)
2 | [](https://www.python.org/downloads/)
3 | []()
4 |
5 | ## Description
6 |
7 | **PCRT** (PNG Check & Repair Tool) is a tool to help check if PNG image correct and try to auto fix the error. It's cross-platform, which can run on **Windows**, **Linux** and **Mac OS**.
8 |
9 | It can:
10 |
11 | Show image information
12 | Fix PNG header error
13 | Fix wrong IHDR chunk crc due to error picture's width or height
14 | Fix wrong IDAT chunk data length due to DOS->UNIX conversion
15 | Fix wrong IDAT chunk crc due to its own error
16 | Fix lost IEND chunk
17 | Extract data after IEND chunk (Malware programs like use this way to hide)
18 | Show the repaired image
19 | Inject payload into image
20 | Decompress image data and show the raw image
21 | ...
22 | Maybe more in the future :)
23 |
24 |
25 | ## Install
26 |
27 | - #### **Install Python 2.7**
28 | - [Python 2.7](https://www.python.org/downloads/)
29 |
30 | - #### **Install Python dependency packages**
31 | - Tkinter
32 | - [PIL](https://pypi.python.org/pypi/PIL/1.1.6)
33 | - ctypes (For Windows)
34 |
35 |
36 | - #### **Clone the source code**
37 |
38 | git clone https://github.com/sherlly/PCRT.git
39 | cd PCRT
40 | python PCRT.py
41 |
42 | ## Usage
43 |
44 | > python PCRT.py -h
45 | usage: PCRT.py [-h] [-q] [-y] [-v] [-m] [-n NAME] [-p PAYLOAD] [-w WAY]
46 | [-d DECOMPRESS] [-i INPUT] [-f] [-o OUTPUT]
47 |
48 | optional arguments:
49 | -h, --help show this help message and exit
50 | -q, --quiet don't show the banner infomation
51 | -y, --yes auto choose yes
52 | -v, --verbose use the safe way to recover
53 | -m, --message show the image information
54 | -n NAME, --name NAME payload name [Default: random]
55 | -p PAYLOAD, --payload PAYLOAD
56 | payload to hide
57 | -w WAY, --way WAY payload chunk: [1]: ancillary [2]: critical
58 | [Default:1]
59 | -d DECOMPRESS, --decompress DECOMPRESS
60 | decompress zlib data file name
61 | -i INPUT, --input INPUT
62 | Input file name (*.png) [Select from terminal]
63 | -f, --file Input file name (*.png) [Select from window]
64 | -o OUTPUT, --output OUTPUT
65 | Output repaired file name [Default: output.png]
66 |
67 | **[Notice]** without `-v` option means that assume all IDAT chunk length are correct
68 |
69 |
70 | ## Show
71 |
72 | - Window:
73 |
74 | 
75 |
76 | - Linux:
77 |
78 | 
79 |
80 | - Mac OS:
81 |
82 | 
83 |
84 | ## Some Problem:
85 |
86 | - For Window:
87 |
88 | > Can't show the repaired image
89 |
90 | 1. Find the file named `ImageShow.py` under the path like `X:\Python27\lib\site-packages\PIL\ImageShow.py`
91 | 2. Find the code `return "start /wait %s && ping -n 2 127.0.0.1 >NUL && del /f %s" % (file, file)` around line 100 and commented it
92 | 3. Add the new code: `return "start /wait %s && PING 127.0.0.1 -n 5 > NUL && del /f %s" % (file, file)` and save
93 | 4. Restart the python IDE
94 |
95 | ## Release Log
96 |
97 | ### version 1.1:
98 |
99 |
100 | **Add:**
101 |
102 | - Show image information (`-m`)
103 | - Inject payload into image (`-p`)
104 | - add into ancillary chunk (chunk name can be randomly generated or self-defined) (`-w 1`)
105 | - add into critical chunk (only support IDAT chunk) (`-w 2`)
106 | - decompress image data and show the raw image (`-d`)
107 |
108 | ### version 1.0:
109 |
110 | **Feature:**
111 |
112 | - Fix PNG header error
113 | - Fix wrong IHDR chunk crc due to error picture's width or height
114 | - Fix wrong IDAT chunk data length due to DOS->UNIX conversion
115 | - Fix wrong IDAT chunk crc due to its own error
116 | - Fix lost IEND chunk
117 | - Extract data after IEND chunk (Malware programs like use this way to hide)
118 | - Show the repaired image
119 | ---
120 |
121 | ## 项目描述
122 |
123 | **PCRT** (PNG Check & Repair Tool) 工具旨在实现检查并自动化修复损坏的PNG图像。 支持在**Windows/Linux/Mac OS**平台使用。
124 |
125 | 它可以实现:
126 |
127 | 显示图片文件信息
128 | 修复PNG文件头错误
129 | 修复由于错误的图片长度或宽度导致的IHDR块crc校验出错
130 | 修复由于DOS->UNIX平台自动格式转换导致的部分IDAT块数据长度出错
131 | 修复由于自身错误导致的IDAT块crc校验出错
132 | 修复丢失的IEND块
133 | 提取追加在IEND块后的数据(恶意程序常使用的传播方式)
134 | 自动显示修复后的图片
135 | 添加payload到图片文件
136 | 解析图片压缩数据并显示
137 | ...
138 | 更多功能有待开发:)
139 |
140 |
141 |
142 | ## 安装
143 |
144 | - #### **安装 Python 2.7**
145 | - [Python 2.7](https://www.python.org/downloads/)
146 |
147 | - #### **安装需要的Python 依赖包**
148 | - Tkinter
149 | - [PIL](https://pypi.python.org/pypi/PIL/1.1.6)
150 | - ctypes (For Windows)
151 |
152 |
153 | - #### **拷贝源码到本地**
154 |
155 | git clone https://github.com/sherlly/PCRT.git
156 | cd PCRT
157 | python PCRT.py
158 |
159 | ## 使用方法
160 |
161 | > python PCRT.py -h
162 | usage: PCRT.py [-h] [-q] [-y] [-v] [-m] [-n NAME] [-p PAYLOAD] [-w WAY]
163 | [-d DECOMPRESS] [-i INPUT] [-f] [-o OUTPUT]
164 |
165 | optional arguments:
166 | -h, --help show this help message and exit
167 | -q, --quiet don't show the banner infomation
168 | -y, --yes auto choose yes
169 | -v, --verbose use the safe way to recover
170 | -m, --message show the image information
171 | -n NAME, --name NAME payload name [Default: random]
172 | -p PAYLOAD, --payload PAYLOAD
173 | payload to hide
174 | -w WAY, --way WAY payload chunk: [1]: ancillary [2]: critical
175 | [Default:1]
176 | -d DECOMPRESS, --decompress DECOMPRESS
177 | decompress zlib data file name
178 | -i INPUT, --input INPUT
179 | Input file name (*.png) [Select from terminal]
180 | -f, --file Input file name (*.png) [Select from window]
181 | -o OUTPUT, --output OUTPUT
182 | Output repaired file name [Default: output.png]
183 |
184 | **[注意]** 如果不添加 `-v` 选项则默认所有IDAT块长度均合法, 即不出现声明的IDAT数据块长度和实际数据长度不符合的情况。
185 |
186 |
187 | ## 示例
188 |
189 | - Window:
190 |
191 | 
192 |
193 | - Linux:
194 |
195 | 
196 |
197 | - Mac OS:
198 |
199 | 
200 |
201 | ## 可能出现的一些问题
202 |
203 | - Window下:
204 |
205 | > 出现修复后图片无法显示时:
206 |
207 | 1. 找到Python安装路径下的文件 `X:\Python27\lib\site-packages\PIL\ImageShow.py`
208 | 2. 将在100行左右的代码`return "start /wait %s && ping -n 2 127.0.0.1 >NUL && del /f %s" % (file, file)`注释掉
209 | 3. 添加代码:`return "start /wait %s && PING 127.0.0.1 -n 5 > NUL && del /f %s" % (file, file)`并保存
210 | 4. 重启运行python的IDE
211 |
212 | ## 更新日志
213 |
214 | ### version 1.1:
215 |
216 |
217 | **增加:**
218 |
219 | - 显示图片文件信息(`-m`)
220 | - 添加payload到图片文件(`-p`)
221 | - 支持添加到辅助块(块名可随机生成或自定义)(`-w 1`)
222 | - 支持添加到关键块(仅支持IDAT)(`-w 2`)
223 | - 解析图片压缩数据并显示(`-d`)
224 |
225 | ### version 1.0:
226 |
227 | **特性:**
228 |
229 | - 实现修复PNG文件头错误
230 | - 实现修复由于错误的图片长度或宽度导致的IHDR块crc校验出错
231 | - 实现修复由于DOS->UNIX平台自动格式转换导致的部分IDAT块数据长度出错
232 | - 实现修复由于自身错误导致的IDAT块crc校验出错
233 | - 实现修复丢失的IEND块
234 | - 实现提取追加在IEND块后的数据(恶意程序常使用的传播方式)
235 | - 实现自动显示修复后的图片
--------------------------------------------------------------------------------
/README_fr.md:
--------------------------------------------------------------------------------
1 | # PCRT (PNG Check & Repair Tool)
2 |
3 | Traduction par: [ret42](https://github.com/ret42)
4 |
5 | ## Description:
6 |
7 | **PCRT** (PNG Check & Repair Tool), est un outil qui permet de regarder si une image PNG n'est pas corrompue et essaye automatiquement de fixer l'erreur. C'est multiplateforme, ceci marche sous **Windows**, **Linux** et **Mac OS**.
8 |
9 | Ça peut:
10 | ```
11 | Montrer les informations d'une image
12 | Corriger les erreurs header d'un PNG
13 | Corriger les mauvais chunk IHDR crc dû à une erreur liée à la largeur et la hauteur d'une image
14 | Corriger les mauvais chunk IDAT data lenght dû à la version DOS->UNIX
15 | Corriger les mauvais chunk IDAT crc causé par sa propre erreur
16 | Corriger les chunk IEND perdus
17 | Extrait les données après le chunk IEND (Les programmes malveillants aiment utiliser cette méthode pour se cacher)
18 | Affiche l'image réparée
19 | Injection de payload dans une image
20 | Décompresse les données d'une image et affiche l'image originale
21 | Peut-être plus dans le futur :)
22 | ```
23 |
24 |
25 | ## Installation:
26 |
27 | - #### **Installer Python 2.7**
28 | - [Python 2.7](https://www.python.org/downloads/)
29 |
30 | - #### **Installer les packages Python**
31 | - Tkinter
32 | - [PIL](https://pypi.python.org/pypi/PIL/1.1.6)
33 | - ctypes (Pour Windows)
34 |
35 |
36 | - #### **Cloner le source code:**
37 |
38 | ```
39 | git clone https://github.com/sherlly/PCRT.git
40 | cd PCRT
41 | python PCRT.py
42 | ```
43 |
44 | ## Utilisation:
45 |
46 | ```
47 | > python PCRT.py -h
48 | usage: PCRT.py [-h] [-q] [-y] [-v] [-m] [-n NAME] [-p PAYLOAD] [-w WAY]
49 | [-d DECOMPRESS] [-i INPUT] [-f] [-o OUTPUT]
50 |
51 | optional arguments:
52 | -h, --help show this help message and exit
53 | -q, --quiet don't show the banner infomation
54 | -y, --yes auto choose yes
55 | -v, --verbose use the safe way to recover
56 | -m, --message show the image information
57 | -n NAME, --name NAME payload name [Default: random]
58 | -p PAYLOAD, --payload PAYLOAD
59 | payload to hide
60 | -w WAY, --way WAY payload chunk: [1]: ancillary [2]: critical
61 | [Default:1]
62 | -d DECOMPRESS, --decompress DECOMPRESS
63 | decompress zlib data file name
64 | -i INPUT, --input INPUT
65 | Input file name (*.png) [Select from terminal]
66 | -f, --file Input file name (*.png) [Select from window]
67 | -o OUTPUT, --output OUTPUT
68 | Output repaired file name [Default: output.png]
69 | ```
70 |
71 | **[Notice]** sans l'option `-v` signifie que l'on supppose que touts les chunk IDAT lenght sont correctes
72 |
73 |
74 | ## Exemples:
75 |
76 | - Windows:
77 |
78 | 
79 |
80 | - Linux:
81 |
82 | 
83 |
84 | - Mac OS:
85 |
86 | 
87 |
88 |
89 | ## Quelques problèmes:
90 |
91 | - Pour Windows:
92 |
93 | > Impossible d'afficher l'image réparée
94 |
95 | 1. Trouver le fichier nommé `ImageShow.py` sous un chemin tel que `X:\Python27\lib\site-packages\PIL\ImageShow.py`
96 | 2. Trouver la ligne de code: `return "start /wait %s && ping -n 2 127.0.0.1 >NUL && del /f %s" % (file, file)` autour de la centième ligne et mettez le en commentaire
97 | 3. Ajoutez cette nouvelle ligne de code: `return "start /wait %s && PING 127.0.0.1 -n 5 > NUL && del /f %s" % (file, file)` et sauvegarder
98 | 4. Relancer l'IDE Python
99 |
100 | ## Journal de mise à jour
101 |
102 | ### Version 1.1:
103 |
104 | **Ajouts**:
105 |
106 | - Montre les informations d'une image (`-m`)
107 | - Injection de payload dans une image (`-p`)
108 | - Ajout dans un chunk auxiliaire (Le nom du chunk peut généré aléatoirement ou peut être auto-définis) (`-w 1`)
109 | - Ajout dans un chunk critique (Supporte uniquement le chunk IDAT) (`-w 2`)
110 | - Décompresse les données d'une image et affiche l'image originale (`-d`)
111 |
112 | ### Version 1.0:
113 | **Options**:
114 | - Corrige les erreurs header d'un PNG
115 | - Corrige les mauvais chunk IHDR crc dû à une erreur liée à la largeur et la hauteur d'une image
116 | - Corrige les mauvais chunk IDAT data lenght dû à la version DOS->UNIX
117 | - Corrige les mauvais chunk IDAT crc causé par sa propre erreur
118 | - Corrige les chunk IEND perdus
119 | - Extrait les données après le chunk IEND (Les programmes malveillants aiment utiliser cette méthode pour se cacher)
120 | - Affiche l'image réparée
121 |
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/examples/0707.png:
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https://raw.githubusercontent.com/sherlly/PCRT/6215ece680728be6c5b9753890389a0098277c53/examples/0707.png
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/examples/IHDR.png:
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https://raw.githubusercontent.com/sherlly/PCRT/6215ece680728be6c5b9753890389a0098277c53/examples/IHDR.png
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/examples/append.png:
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https://raw.githubusercontent.com/sherlly/PCRT/6215ece680728be6c5b9753890389a0098277c53/examples/append.png
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/examples/corrupt.png:
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https://raw.githubusercontent.com/sherlly/PCRT/6215ece680728be6c5b9753890389a0098277c53/examples/corrupt.png
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/examples/new.bin:
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https://raw.githubusercontent.com/sherlly/PCRT/6215ece680728be6c5b9753890389a0098277c53/examples/new.bin
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