Identify all types of compressed files in c#

Question

Is it possible to identify all types of compressed (.zip, .7z, .rar, etc) files in c#.

I know that can be done by identifying file extension but is that the reliable way or is there any better way to do so?

https://stackoverflow.com/questions/11996299/c-net-identify-zip-file ,have you try this — ABCD, Feb 27 '20 at 04:18
In general... probably, categorically... probably not. How are you going to determine Disneylands mickey-mouse humpty dumpty compression algorithm invented and used by joe blogs of the blogs foundation 25 years ago? — TheGeneral, Feb 27 '20 at 04:18
Inspection of the “magic bytes” (hint: search term) is usually a more honest indicator, although both can be lies. There are databases that contain such “magic byte” rules, and likely some with C# implementations. Proper extraction is the ultimate guarantee of content. — user2864740, Feb 27 '20 at 04:18
you can identify common/publicly available formats, but obviously it's impossible to identify **all** types of compressed formats. Do you know how many formats out there? — phuclv, Aug 04 '22 at 16:58

score 0 · Answer 1 · answered Feb 27 '20 at 04:56

You can try the below code (I did not try)

//YOUR FILE
FileAttributes attributes = File.GetAttributes("c:/Temp/SomeFile");

//CHECK FOR COMPRESSED 
if ((attributes & FileAttributes.Compressed) == FileAttributes.Compressed)
{
    Console.WriteLine("The file is compressed.");
}

Reading:

https://learn.microsoft.com/en-us/dotnet/api/system.io.fileattributes?view=netframework-4.8

Identify all types of compressed files in c#

1 Answers1