CODEWITHSUNDEEP
c#filestreamc#-ziparchive
Simone
Simone

Reputation: 99

Check if FileStream is from a ZipArchive

If I have a FileStream how can I check if it's from a ZipArchive ? Now I use a try catch statement that throw a

'System.IO.InvalidDataException: 'End of Central Directory record could not be found.'

if the stream is not from a ZipArchive.

try
{
    ZipArchive za = new ZipArchive(fIleStream, ZipArchiveMode.Read);
    ...
}
catch (Exception e)
{
    ...
}

Upvotes: 1

Views: 793

Answers (1)

Frederik Banke
Frederik Banke

Reputation: 492

You could sniff the first two bytes of the stream to see if it matches the zip signature.

As described here https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT

Should be 0x504b to be zip data.

Upvotes: 3

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