使用python判断jpeg图片的完整性实例

Start Marker | JFIF Marker | Header Length | Identifier 0xff, 0xd8  | 0xff, 0xe0 |  2-bytes  | "JFIF/0"

def is_jpg(filename):  data = open(filename,'rb').read(11)  if data[:4] != '/xff/xd8/xff/xe0' and data[:4]!='/xff/xd8/xff/xe1':     return False  if data[6:] != 'JFIF/0' and data[6:] != 'Exif/0':     return False  return True

from PIL import Imagedef is_jpg(filename):  try:    i=Image.open(filename)    return i.format =='JPEG'  except IOError:    return Fals

#coding=utf-8#summary: 判断图片的有效性import ioimport os from PIL import Image#判断文件是否为有效（完整）的图片#输入参数为文件路径#会出现漏检的情况def IsValidImage(pathfile): bValid = True try:  Image.open(pathfile).verify() except:  bValid = False return bValid  def is_valid_jpg(jpg_file):   """判断JPG文件下载是否完整   """   if jpg_file.split('.')[-1].lower() == 'jpg':     with open(jpg_file, 'rb') as f:       f.seek(-2, 2)       return f.read() == '/xff/xd9' #判定jpg是否包含结束字段   else:     return True #利用PIL库进行jpeg格式判定，但有些没有结束字段的文件检测不出来def is_jpg(filename):  try:    i=Image.open(filename)    return i.format =='JPEG'  except IOError:    return False allfiles=os.listdir('image')log_file=open('img_lossinfo.txt','w')log = open('img_r.txt','w')log_w=open('img_w.txt','w')log1=open('img_jpeg.txt','w')log2=open('img_notjpg.txt','w')for i in allfiles:#if 1:	if i[-4:]=='.jpg':		f=os.path.join('image',i)		value=IsValidImage(f)		if not value:			log_file.write(i+'/n')		if is_valid_jpg(f):			print f			log.write(i+'/n')		else:			log_w.write(i+'/n')		if is_jpg(f):			log1.write(i+'/n')		else:			log2.write(i+'/n')