Detect and distinguish avi and wav

Question

Hello all

According to this table, AVI and WAV part:

https://en.wikipedia.org/wiki/List_of_file_signatures

I have the initial 12 bytes of the file:

Case InputByte.Take(12).SequenceEqual({&Hxx, &Hxx, &Hxx, &Hxx, &Hxx, &Hxx, &Hxx, &Hxx, &Hxx, &Hxx, &Hxx, &Hxx})

wav:

52 49 46 46 ?? ?? ?? ??

57 41 56 45

avi:

52 49 46 46 ?? ?? ?? ??

41 56 49 20

no idea how to correctly check against my bytes :(

Anyone knows?

Answer 1

Try something like this for .wav:

Case InputByte.Take(4).SequenceEqual({&H52, &H49, &H46, &H46}) AndAlso InputByte.Skip(8).Take(4).SequenceEqual({&H57, &H41, &H56, &H45})

Make sure that the length of the file is greater than 12.