├── .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: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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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 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 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 | [![Python 2.7](https://img.shields.io/badge/Python-2.7-blue.svg)](https://www.python.org/downloads/) 3 | [![Version 1.1](https://img.shields.io/badge/Version-1.1-brightgreen.svg)]() 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 | ![](http://i.imgur.com/Ksk2ctV.png) 75 | 76 | - Linux: 77 | 78 | ![](http://i.imgur.com/ZXnPqYD.png) 79 | 80 | - Mac OS: 81 | 82 | ![](http://i.imgur.com/re4gQux.png) 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 | ![](http://i.imgur.com/Ksk2ctV.png) 192 | 193 | - Linux: 194 | 195 | ![](http://i.imgur.com/ZXnPqYD.png) 196 | 197 | - Mac OS: 198 | 199 | ![](http://i.imgur.com/re4gQux.png) 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 | ![](http://i.imgur.com/Ksk2ctV.png) 79 | 80 | - Linux: 81 | 82 | ![](http://i.imgur.com/ZXnPqYD.png) 83 | 84 | - Mac OS: 85 | 86 | ![](http://i.imgur.com/re4gQux.png) 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 | -------------------------------------------------------------------------------- /examples/0707.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/sherlly/PCRT/6215ece680728be6c5b9753890389a0098277c53/examples/0707.png -------------------------------------------------------------------------------- /examples/IHDR.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/sherlly/PCRT/6215ece680728be6c5b9753890389a0098277c53/examples/IHDR.png -------------------------------------------------------------------------------- /examples/append.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/sherlly/PCRT/6215ece680728be6c5b9753890389a0098277c53/examples/append.png -------------------------------------------------------------------------------- /examples/corrupt.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/sherlly/PCRT/6215ece680728be6c5b9753890389a0098277c53/examples/corrupt.png -------------------------------------------------------------------------------- /examples/new.bin: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/sherlly/PCRT/6215ece680728be6c5b9753890389a0098277c53/examples/new.bin --------------------------------------------------------------------------------