上传时如何检查图像是否为.tif [英] How do i check image is .tif while uploading

问题描述

我要上传.tif图像.我如何通过将.exe文件的扩展名更改为.tif来验证可以上传.exe文件的某人的上传，因此可以避免在vb.net中发生此类攻击.
谢谢..

I want to upload .tif images .how do i validate the upload from some one who can upload .exe file by changing its extension to .tif.Is any way to avoid such attack in vb.net.
thank you..

推荐答案

TIFF可以通过窥视第一个字节

TIFF can be detected by peeking at first bytes http://local.wasp.uwa.edu.au/~pbourke/dataformats/tiff/

The first 8 bytes forms the header. The first two bytes of which is either "II" for little endian byte ordering or "MM" for big endian byte ordering.

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