问题描述
我得到了从应用程序发送到我的 redis 服务器的图像的以下 Base64 表示: https://1drv.ms/t/s!AkTtiXv5QMtWliMbeziGpd0t1EjW?e=JDHEkt
以下是那些不想下载整个 13MB 数据文件的人的数据摘录:
b'\\/9j\\/4b6URXhpZgAASUkqAAgAAAAMAAABBAABAAAAoA8AAAEBBAABAAAAuAsAAA8BAgAIAAAAngAA\\nABABAgAJAAAApgAAABIBAwABAAAAAQAAABoBBQABAAAA0gAAABsBBQABAAAA2gAAACgBAwABAAAA\\nAgAAADEBAgAOAAAAsAAAADIBAgAUAAAAvgAAABMCAwABAAAAAQAAAGmHBAABAAAA4gAAAIQCAABz\\nYW1
我尝试使用以下方法修复 b64:
import base64
with open('Outputfirst.txt','r') as file:
imgstring = file.read().replace('\n','')
#get rid of wrong characters
imgstring = imgstring.replace("b'",'')
imgstring = imgstring.replace('\\','')
imgstring = imgstring.replace('"','')
imgstring = imgstring.replace('\'','')
imgstring = imgstring.replace(',','')
#take care of padding
if(len(imgstring)%4 ==1):
imgstring = imgstring +"==="
if(len(imgstring)%4 ==2):
imgstring = imgstring +"=="
if(len(imgstring)%4 ==3):
imgstring = imgstring +"="
imgstring = bytes(imgstring,'utf8')
with open(filename,'wb') as f:
f.write(imgstring)
imgdata = base64.b64decode(imgstring)
filename = 'some_image3.jpg'
with open(filename,'wb') as f:
f.write(imgdata)
但不知何故我没有正确恢复图像。
当我通过 https://base64.guru/tools/repair 使用此工具并将其输出作为脚本的输入时,我得到了我想要的图像。
解决方法
似乎 v2
没有被过滤掉。
整个过滤和填充可以这样完成:
\\n
用 3 '=' 填充无效:
with open('Outputfirst.txt','r') as file:
imgstring = file.read().replace('\\n','').replace('\\','').replace("b'",'')
imgstring = imgstring + '=' * (4 - len(imgstring) % 4)