修复从ipa文件中提取的png文件的Python脚本 for Python 3.x
一个比较老的脚本，可以修复从ipa里面提取的png文件。原本只支持 Python 2.7, 修改为支持Python3.x版本
使用方法：拷贝该文件到png所在文件夹。运行即可。支持子文件夹遍历
# --# iPIN - iPhone PNG Images Normalizer v1.3# Modified by Jeffrey Ma# On 3/5/2013# Description: updates for Python ver 3.x# raw_input be changed to input# print "" be changed to print("")# except Exception, e be changed to except Exception as e#---#---# iPIN - iPhone PNG Images Normalizer v1.3# Copyright (C) 2007## Author:# Axel E. Brzostowski# http://www.axelbrz.com.ar/# axelbrz@gmail.com# # References:# http://iphone.fiveforty.net/wiki/index.php/PNG_Images# http://www.libpng.org/pub/png/spec/1.2/PNG-Contents.html# # This program is free software: you can redistribute it and/or modify# it under the terms of the GNU General Public License as published by# the Free Software Foundation, either version 3 of the License.# # This program is distributed in the hope that it will be useful,# but WITHOUT ANY WARRANTY; without even the implied warranty of# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the# GNU General Public License for more details.# #---from struct import *from zlib import *import statimport sysimport osdef getNormalizedPNG(filename): pngheader = "\x89PNG\r\n\x1a\n" file = open(filename, "rb") oldPNG = file.read() file.close() if oldPNG[:8] != pngheader: return None newPNG = oldPNG[:8] chunkPos = len(newPNG) # For each chunk in the PNG file while chunkPos < len(oldPNG): # Reading chunk chunkLength = oldPNG[chunkPos:chunkPos+4] chunkLength = unpack(">L", chunkLength)[0] chunkType = oldPNG[chunkPos+4 : chunkPos+8] chunkData = oldPNG[chunkPos+8:chunkPos+8+chunkLength] chunkCRC = oldPNG[chunkPos+chunkLength+8:chunkPos+chunkLength+12] chunkCRC = unpack(">L", chunkCRC)[0] chunkPos += chunkLength + 12 # Parsing the header chunk if chunkType == "IHDR": width = unpack(">L", chunkData[0:4])[0] height = unpack(">L", chunkData[4:8])[0] # Parsing the image chunk if chunkType == "IDAT": try: # Uncompressing the image chunk bufSize = width * height * 4 + height chunkData = decompress( chunkData, -8, bufSize) except Exception as e: # The PNG image is normalized return None # Swapping red & blue bytes for each pixel newdata = "" for y in xrange(height): i = len(newdata) newdata += chunkData[i] for x in xrange(width): i = len(newdata) newdata += chunkData[i+2] newdata += chunkData[i+1] newdata += chunkData[i+0] newdata += chunkData[i+3] # Compressing the image chunk chunkData = newdata chunkData = compress( chunkData ) chunkLength = len( chunkData ) chunkCRC = crc32(chunkType) chunkCRC = crc32(chunkData, chunkCRC) chunkCRC = (chunkCRC + 0x100000000) % 0x100000000 # Removing CgBI chunk if chunkType != "CgBI": newPNG += pack(">L", chunkLength) newPNG += chunkType if chunkLength > 0: newPNG += chunkData newPNG += pack(">L", chunkCRC) # Stopping the PNG file parsing if chunkType == "IEND": break return newPNGdef updatePNG(filename): data = getNormalizedPNG(filename) if data != None: file = open(filename, "wb") file.write(data) file.close() return True return datadef getFiles(base): global _dirs global _pngs if base == ".": _dirs = [] _pngs = [] if base in _dirs: return files = os.listdir(base) for file in files: filepath = os.path.join(base, file) try: st = os.lstat(filepath) except os.error: continue if stat.S_ISDIR(st.st_mode): if not filepath in _dirs: getFiles(filepath) _dirs.append( filepath ) elif file[-4:].lower() == ".png": if not filepath in _pngs: _pngs.append( filepath ) if base == ".": return _dirs, _pngsprint ("-----------------------------------")print (" iPhone PNG Images Normalizer v1.3")print ("-----------------------------------")print (" ")dirs, pngs = getFiles(".")print ("[+] Searching PNG files...", dirs, pngs)print ("ok")if len(pngs) == 0: print (" ") print ("[!] Alert: There are no PNG files found. Move this python file to the folder that contains the PNG files to normalize.") exit() print (" ")print (" - %d PNG files were found at this folder (and subfolders)." % len(pngs))print (" ")while True: normalize = input("[?] Do you want to normalize all images (Y/N)? ").lower() if len(normalize) > 0 and (normalize[0] == "y" or normalize[0] == "n"): breaknormalized = 0if normalize[0] == "y": for ipng in xrange(len(pngs)): perc = (float(ipng) / len(pngs)) * 100.0 print ("%.2f%% %s" % (perc, pngs[ipng])) if updatePNG(pngs[ipng]): normalized += 1print (" ")print ("[+] %d PNG files were normalized." % normalized)