Example of using python to determine the integrity of jpeg image

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 Image
def is_jpg(filename):
  try:
    i=(filename)
    return  =='JPEG'
  except IOError:
    return Fals

#coding=utf-8
#summary: To judge the validity of picturesimport io
import os
 
from PIL import Image
#Judge whether the file is a valid (complete) picture#Enter the parameter as file path#There will be misseddef IsValidImage(pathfile):
 bValid = True
 try:
  (pathfile).verify()
 except:
  bValid = False
 return bValid
 
 
def is_valid_jpg(jpg_file): 
  """Judge whether the JPG file download is complete
   """ 
  if jpg_file.split('.')[-1].lower() == 'jpg': 
    with open(jpg_file, 'rb') as f: 
      (-2, 2) 
      return () == '\xff\xd9' #Determine whether jpg contains the end field  else: 
    return True
 
#Use the PIL library to make jpeg format judgment, but some files without end fields cannot be detecteddef is_jpg(filename):
  try:
    i=(filename)
    return  =='JPEG'
  except IOError:
    return False
 
allfiles=('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=('image',i)
		value=IsValidImage(f)
		if not value:
			log_file.write(i+'\n')
		if is_valid_jpg(f):
			print f
			(i+'\n')
		else:
			log_w.write(i+'\n')
		if is_jpg(f):
			(i+'\n')
		else:
			(i+'\n')