このスクリプトをダウンロードして、いくつかの PNG を変換できるようにしました。ただし、2003年から初めて実行しようとしたときに、例外構文のエラーが発生しました。私はなんとかそれを修正して、もう一度実行しました。次に、印刷構文のエラーが発生しました。それらも修正しました。今、スクリプトが機能していない以外に何が起こっているのかまったくわかりません。
スクリプトは次のとおりです。
from struct import *
from zlib import *
import stat
import sys
import os
def 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 newPNG
def updatePNG(filename):
data = getNormalizedPNG(filename)
if data != None:
file = open(filename, "wb")
file.write(data)
file.close()
return True
return data
def 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, _pngs
print ("iPhone PNG Images Normalizer v1.0")
print (" ")
print ("[+] Searching PNG files..."),
dirs, pngs = getFiles(".")
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 = raw_input("[?] Do you want to normalize all images (Y/N)? ").lower()
if len(normalize) > 0 and (normalize[0] == "y" or normalize[0] == "n"):
break
normalized = 0
if 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 += 1
print (" ")
print ("[+] %d PNG files were normalized.") % normalized
DOS ウィンドウで実行すると、次のエラーが表示されます。
C:\wamp\www\py>ipin.py
iPhone PNG Images Normalizer v1.0
[+] Searching PNG files...
ok
- %d PNG files were found at this folder (and subfolders).
Traceback (most recent call last):
File "C:\wamp\www\py\ipin.py", line 158, in <module>
print (" - %d PNG files were found at this folder (and subfolders).") % len(pngs)
TypeError: unsupported operand type(s) for %: 'NoneType' and 'int'
私は何をしますか？