CODEWITHSUNDEEP
filegziptarfile-type
Samarth Singhal
Samarth Singhal

Reputation: 9

Detect if a given file is gzip or TarGzip

Given a file, using the magic sequence, I can detect with compression type it belongs to. But magic sequence for gzip and tarGzip is the same. So, how can I differentiate between these 2 file types.

On https://en.wikipedia.org/wiki/List_of_file_signatures , we can see that the file signature for both these files is hexadecimal 1f 8b

Upvotes: 1

Views: 577

Answers (1)

Mark Adler
Mark Adler

Reputation: 112607

Decompress the first 1K bytes and check the tar checksum on the first 512 of those. If that matches, it is very likely you are dealing with a tar file. (If there aren't 1024 bytes, then it isn't a tar file.)

Upvotes: 1

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