Is Zip or not?

Hello

I wonder how I know if a particular file is a zip or not.
Anyone have any ideas?

I tried to do this:

Code:

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FileInputStream fis = new FileInputStream(argv[0]); 
            ZipInputStream zis = new ZipInputStream(new BufferedInputStream(fis)); 
ZipEntry entry; 
while((entry = zis.getNextEntry()) != null) { 
 
 MYCODE 
 
 }

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The problem is that I can not distinguish between a non-zip file and a empty zip file...

Thank you very much.

Hi,
Please repeat ur question clearly.

U can check whether the file ends with zip or not know for finding out whethether it is a zip file?.

Or check the first two bytes of the file equal PK

Quote:

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Originally Posted by mrmatt1111

Or check the first two bytes of the file equal PK

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Hi,

I am interested in your argument. Could you explain more specifically what you mean?

Thank you so much.

Quote:

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Originally Posted by icsbcn

Hello
The problem is that I can not distinguish between a non-zip file and a empty zip file...

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How is that a problem? Either you can parse it, or you can't, same difference, so why, exactly, do you need to know whether it was an actual zipfile or not?

Quote:

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Originally Posted by RamyaSivakanth

Hi,
Please repeat ur question clearly.

U can check whether the file ends with zip or not know for finding out whethether it is a zip file?.

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So rename a text file so it has a .zip ending and this is now a zipfile? Windoof thinks so, but I didn't think anyone else really believed that.

Quote:

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Originally Posted by icsbcn

Hi,

I am interested in your argument. Could you explain more specifically what you mean?

Thank you so much.

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Read the first two bytes of the file using FileInputStream and it's read methods (a FileInputStream, not a FileReader), then close that inputstream before initiating the Zip classes.